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OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Direct Replacements for PMI and LTC OP27and OP37 Series
Features of OP27A, OP27C, OP37A, andOP37C: Maximum Equivalent Input Noise Voltage:
3.8 nV/√Hz at 1 kHz5.5 nV/√Hz at 10 kHz
Very Low Peak-to-Peak Noise Voltage at0.1 Hz to 10 Hz . . . 80 nV Typ
Low Input Offset Voltage . . . 25 µV Max
High Voltage Amplification . . . 1 V/µV Min
Feature of OP37 Series: Minimum Slew Rate . . . 11 V/µs
description
The OP27 and OP37 operational amplifierscombine outstanding noise performance withexcellent precision and high-speed specifica-tions. The wideband noise is only 3 nV/√Hz andwith the 1/f noise corner at 2.7 Hz, low noise ismaintained for all low-frequency applications.
The outstanding characteristics of the OP27 andOP37 make these devices excellent choicesfor low-noise amplifier applications requiringprecision performance and reliability. Additionally,the OP37 is free of latch-up in high-gain,large-capacitive-feedback configurations.
The OP27 series is compensated for unity gain.The OP37 series is decompensated for increasedbandwidth and slew rate and is stable down to again of 5.
The OP27A, OP27C, OP37A, and OP37C are characterized for operation over the full military temperaturerange of –55°C to 125°C. The OP27E, OP27G, OP37E, and OP37G are characterized for operation from – 25°Cto 85°C.
AVAILABLE OPTIONS
VIOmax STABLEPACKAGE
TAVIOmaxAT 25°C
STABLEGAIN CERAMIC DIP
(JG)CHIP CARRIER
(FK)PLASTIC DIP
(P)
25 µV1 — — OP27EP
25°C to 85°C
25 µV5 — — OP37EP
–25°C to 85°C
100 µV1 — — OP27GP
100 µV5 — — OP37GP
25 µV1 OP27AJG OP27AFK —
55°C to 125°C
25 µV5 OP37AJG OP37AFK —
–55°C to 125°C
100 µV1 OP27CJG — —
100 µV5 OP37CJG — —
Copyright 2000, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
8
7
6
5
VIOTRIMIN–IN +
VCC –
VIOTRIMVCC+OUTNC
JG OR P PACKAGE(TOP VIEW)
IN+
IN –
OUT
VIO TRIM1 8
6
3
2
symbol
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
NCVCC+NCOUTNC
NC1N–NCIN+NC
FK PACKAGE(TOP VIEW)
NC
NC
NC
NC
NC
NC
NC – No internal connection
CC
–V
Pin numbers are for the JG and P packages.
IOV
TR
IM
+
–
NC
IOV
TR
IM
OP27A, O
P27C, OP27E, O
P27GO
P37A, OP37C, O
P37E, OP37G
LOW
-NOISE HIG
H-SPEED PRECISION O
PERATIONAL-AM
PLIFIER
Template R
elease Date: 7–11–94
SLO
S100C
– FE
BR
UA
RY
1989 – RE
VIS
ED
SE
PT
EM
BE
R 2000
2P
OS
T O
FF
ICE
BO
X 655303 D
ALLA
S, T
EX
AS
75265•
schematic
IN +
IN –
Q3
Q1A
Q1B Q2B Q2A
Q11
Q12
Q27 Q28
Q26
Q46
Q19
Q20
Q45
Q22
Q24Q23
Q21
Q6
VIO TRIM VIO TRIM
VCC +
OUT
VCC –
480 µA 750µA
260µA
240 µA 120µA
340µA
C1†
† C1 = 120 pF for OP27C1 = 15 pF for OP37
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC+ (see Note 1) 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply voltage, VCC– (see Note 1) – 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage, VI VCC±. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Duration of output short circuit unlimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Differential input current (see Note 2) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range: OP27A, OP27C, OP37A, OP37C – 55°C to 125°C. . . . . . . . . . . . . . .
OP27E, OP27G, OP37E, OP37G – 25°C to 85°C. . . . . . . . . . . . . . . . Storage temperature range – 65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package 300°C. . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: P package 260°C. . . . . . . . . . . . . . . . . . . . .
NOTES: 1. All voltage values are with respect to the midpoint between VCC+ and VCC– unless otherwise noted.2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive
input current will flow if a differential input voltage in excess of approximately ± 0.7 V is applied between the inputs unless somelimiting resistance is used.
DISSIPATION RATING TABLE
PACKAGETA ≤ 25°C
POWER RATINGDERATING FACTORABOVE TA = 25°C
TA = 85°CPOWER RATING
TA = 125°CPOWER RATING
JGFKP
1050 mW1375 mW1000 mW
8.4 mW/°C11.0 mW/°C8.0 mW/°C
546 mW715 mW520 mW
210 mW275 mW
N/A
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
OP27A, OP37A OP27C, OP37CUNIT
MIN NOM MAX MIN NOM MAXUNIT
Supply voltage, VCC+ 4 15 22 4 15 22 V
Supply voltage, VCC– –4 –15 –22 –4 –15 –22 V
Common mode input voltage VICVCC± = ± 15 V, TA = 25°C ± 11 ±11
VCommon-mode input voltage, VICVCC± = ± 15 V, TA = – 55°C to 125°C ±10.3 ±10.2
V
Operating free-air temperature, TA –55 125 –55 125 °C
electrical characteristics at specified free-air temperature, V CC± = ±15 V (unless otherwise noted)
PARAMETER TEST CONDITIONS T †OP27A, OP37A OP27C, OP37C
UNITPARAMETER TEST CONDITIONS TA†MIN TYP MAX MIN TYP MAX
UNIT
VIO Input offset voltageVO = 0, VIC = 0 25°C 10 25 30 100
µVVIO Input offset voltage O , ICRS = 50 Ω, See Note 3 Full range 60 300
µV
αVIO
Average temperaturecoefficient of inputoffset voltage
Full range 0.2 0.6 0.4 1.8 µV/°C
Long-term drift of inputoffset voltage
See Note 4 0.2 1 0.4 2 µV/mo
IIO Input offset current VO = 0 VIC = 025°C 7 35 12 75
nAIIO Input offset current VO = 0, VIC = 0Full range 50 135
nA
IIB Input bias current VO = 0 VIC = 025°C ±10 ±40 ±15 ±80
nAIIB Input bias current VO = 0, VIC = 0Full range ±60 ±150
nA
VICRCommon-mode input
25°C11to
–11
11to
–11VVICR voltage range
Full range10.3
to–10.3
10.5to
–10.5
V
RL ≥ 2 kΩ ±12 ±13.8 ±11.5 ±13.5
VOM Peak output voltage swing RL ≥ 0.6 kΩ ±10 ±11.5 ±10 ±11.5 V
RL ≥ 2 kΩ Full range ±11.5 10.5
RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500
Large signal differentialRL ≥ 1 kΩ, VO = ±10 V 800 1500 1500
AVDLarge-signal differentialvoltage amplification RL ≥ 0.6 kΩ, VO = ±1 V,
VCC± = ± 4 V250 700 200 500
V/mV
RL ≥ 2 kΩ, VO = ±10 V Full range 600 300
ri(CM)Common-mode inputresistance
3 2 GΩ
ro Output resistance VO = 0, IO = 0 25°C 70 70 Ω
CMRRCommon-mode rejection VIC = ±11 V 25°C 114 126 100 120
dBCMRRj
ratio VIC = ±10 V Full range 110 94dB
kSVRSupply voltage rejection VCC± = ±4 V to ±18 V 25°C 100 120 94 118
dBkSVRy g j
ratio VCC± = ±4.5 V to ±18 V Full range 96 86dB
† Full range is – 55°C to 125°C.NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after thefirst 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 µV(see Figure 3).
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
5POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, VCC+ 4 15 22 V
Supply voltage, VCC – –4 –15 –22 V
Common mode input voltage VICVCC± = ±15 V, TA = 25°C ±11
VCommon-mode input voltage, VICVCC± = ±15 V, TA = – 55°C to 125°C ±10.5
V
Operating free-air temperature, TA –25 85 °C
electrical characteristics at specified free-air temperature, V CC± = ±15 V (unless otherwise noted)
PARAMETER TEST CONDITIONS T †OP27E, OP37E OP27G, OP37G
UNITPARAMETER TEST CONDITIONS TA†MIN TYP MAX MIN TYP MAX
UNIT
VIO Input offset voltageVO = 0, VIC = 0 25°C 10 25 30 100
µVVIO Input offset voltage O , ICRS = 50 Ω, See Note 3 Full range 60 220
µV
αVIO
Average temperature coefficient of inputoffset voltage
Full range 0.2 0.6 0.4 1.8 µV/°C
Long-term drift of inputoffset voltage
See Note 4 0.2 1 0.4 2 µV/mo
IIO Input offset current VO = 0 VIC = 025°C 7 35 12 75
nAIIO Input offset current VO = 0, VIC = 0Full range 50 135
nA
IIB Input bias current VO = 0 VIC = 025°C ±10 ±40 ±15 ±80
nAIIB Input bias current VO = 0, VIC = 0Full range ±60 ±150
nA
VICRCommon-mode input
25°C11to
–11
11to
–11VVICR voltage range
Full range10.3
to–10.3
10.5to
–10.5
V
P k t t ltRL ≥ 2 kΩ ±12 ±13.8 ±11.5 ±13.5
VOMPeak output voltageswing
RL ≥ 0.6 kΩ ±10 ±11.5 ±10 ±11.5 Vswing
RL ≥ 2 kΩ Full range ±11.5 10.5
RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500
Large signal differentialRL ≥ 1 kΩ, VO = ±10 V 800 1500 1500
AVDLarge-signal differentialvoltage amplification RL ≥ 0.6 kΩ, VO = ±1 V,
VCC± = ± 4 V250 700 200 500
V/mV
RL ≥ 2 kΩ, VO = ± 10 V Full range 600 450
ri(CM)Common-mode inputresistance
3 2 GΩ
ro Output resistance VO = 0, IO = 0 25°C 70 70 Ω
CMRRCommon-mode rejection VIC = ±11 V 25°C 114 126 100 120
dBCMRRj
ratio VIC = ±10 V Full range 110 96dB
kSVRSupply voltage rejection VCC± = ± 4 V to ±18 V 25°C 100 120 94 118
dBkSVRy g j
ratio VCC± = ± 4.5 V to ±18 V Full range 96 90dB
† Full range is – 25°C to 85°C.NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after thefirst 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 µV(see Figure 3).
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27 operating characteristics over operating free-air temperature range, V CC± = ±15 V
PARAMETER TEST CONDITIONSOP27A, OP27E OP27C, OP27G
UNITPARAMETER TEST CONDITIONSMIN TYP MAX MIN TYP MAX
UNIT
SR Slew rate AVD ≥ 1, RL ≥ 2 kΩ 1.7 2.8 1.7 2.8 V/µs
VN(PP)Peak-to-peak equivalentinput noise voltage
f = 0.1 Hz to 10 Hz, RS = 20 Ω,See Figure 34
0.08 0.18 0.09 0.25 µV
f = 10 Hz, RS = 20 Ω 3.5 5.5 3.8 8
Vn Equivalent input noise voltage f = 30 Hz, RS = 20 Ω 3.1 4.5 3.3 5.6 nV/√Hz
f = 1 kHz, RS = 20 Ω 3 3.8 3.2 4.5
f = 10 Hz, See Figure 35 1.5 4 1.5
In Equivalent input noise current f = 30 Hz, See Figure 35 1 2.3 1 pA/√Hz
f = 1 kHz, See Figure 35 0.4 0.6 0.4 0.6
Gain-bandwidth product f = 100 kHz 5 8 5 8 MHz
OP37 operating characteristics over operating free-air temperature range, V CC± = ±15 V
PARAMETER TEST CONDITIONSOP37A, OP37E OP37C, OP37G
UNITPARAMETER TEST CONDITIONSMIN TYP MAX MIN TYP MAX
UNIT
SR Slew rate AVD ≥ 5, RL ≥ 2 kΩ 11 17 11 17 V/µs
VN(PP)Peak-to-peak equivalentinput noise voltage
f = 0.1 Hz to 10 Hz, RS = 20 Ω,See Figure 34
0.08 0.18 0.09 0.25 µV
E i l t i t if = 10 Hz, RS = 20 Ω 3.5 5.5 3.8 8
VnEquivalent input noisevoltage
f = 30 Hz, RS = 20 Ω 3.1 4.5 3.3 5.6 nV/√Hzvoltagef = 1 kHz, RS = 20 Ω 3 3.8 3.2 4.5
f = 10 Hz, See Figure 35 1.5 4 1.5
In Equivalent input noise current f = 30 Hz, See Figure 35 1 2.3 1 pA/√Hz
f = 1 kHz, See Figure 35 0.4 0.6 0.4 0.6
Gain bandwidth productf = 10 kHz 45 63 45 63
MHzGain-bandwidth productAV ≥ 5, f = 1 MHz 40 40
MHz
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
7POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
VIO Input offset voltage vs Temperature 1
∆VIO Change in input offset voltagevs Time after power onvs Time (long-term drift)
23
IIO Input offset current vs Temperature 4
IIB Input bias current vs Temperature 5
VICR Common-mode input voltage range vs Supply voltage 6
VOM Maximum peak output voltage vs Load resistance 7
VO(PP) Maximum peak-to-peak output voltage vs Frequency 8, 9
AVD Differential voltage amplificationvs Supply voltagevs Load resistancevs Frequency
1011
12, 13, 14
CMRR Common-mode rejection ratio vs Frequency 15
kSVR Supply voltage rejection ratio vs Frequency 16
SR Slew ratevs Temperaturevs Supply voltagevs Load resistance
171819
φm Phase margin vs Temperature 20, 21
φ Phase shift vs Frequency 12, 13
Vn Equivalent input noise voltage
vs Bandwidthvs Source resistancevs Supply voltagevs Temperaturevs Frequency
2223242526
In Equivalent input noise current vs Frequency 27
Gain-bandwidth product vs Temperature 20, 21
IOS Short-circuit output current vs Time 28
ICC Supply current vs Supply voltage 29
Pulse responseSmall signalLarge signal
30, 3231, 33
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS †
100
80
60
40
20
0
– 20
– 40
– 60
– 80
– 100– 50 – 25 0 25 50 75 100 125
– In
put O
ffset
Vol
tage
–
V
TA – Free-Air Temperature – °C
INPUT OFFSET VOLTAGE OFREPRESENTATIVE INDIVIDUAL UNITS
vsFREE-AIR TEMPERATURE
VCC± = ±15 V
10
5
0
WARM-UP CHANGE ININPUT OFFSET VOLTAGE
vsELAPSED TIME
1 2 3 4 5
Time After Power On – minutes
IOµV
∆V
IO –
Cha
nge
in In
put O
ffset
Vol
tage
–
Vµ
VCC± = ±15 VTA = 25°C
OP27CP/GPOP37CP/GP
OP27C/37C
OP27A/37AOP27A/37A
OP27E/37E
OP27C/37COP27G/37G OP27AP/EP
OP37AP/EP
Figure 1 Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OFREPRESENTATIVE INDIVIDUAL UNITS
6
2
4
0
– 2
– 4
– 60 1 2 3 4 5 6 7 8
Time – months
0.2-µV/mo Trend Line
0.2-µV/mo Trend Line
∆V
IO –
Cha
nge
in In
put O
ffset
Vol
tage
–
Vµ
Figure 3
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
9POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS †
INPUT OFFSET CURRENTvs
FREE-AIR TEMPERATURE
– In
put O
ffset
Cur
rent
– n
A
TA – Free-Air Temperature – °C
50
40
30
20
10
0– 75 – 50 – 25 0 50 75 100 12525
VCC± = ±15 V
OP27C/GOP37C/G
OP27A/EOP37A/E
INPUT BIAS CURRENTvs
FREE-AIR TEMPERATURE
TA – Free-Air Temperature – °C
± 50
± 40
± 30
± 20
± 10
0– 50 – 25 0 50 75 100 12525
I IO
– In
put B
ias
Cur
rent
– n
AI I
B– 75
OP27C/GOP37C/G
OP27A/EOP37A/E
VCC± = ±15 V
Figure 4 Figure 5
20
COMMON-MODE INPUT VOLTAGE RANGE LIMITSvs
SUPPLY VOLTAGE
0 ±5 ±10 ±15 ±20
VCC+ – Supply Voltage – V
VIC
R –
Com
mon
-Mod
e In
put V
olta
ge R
ange
Lim
its –
V
TA = –55°C
TA = 125°C
TA = – 55°C
TA = 125°C
TA = 25°C
TA = 25°C
– M
axim
um P
eak
Out
put V
olta
ge –
VV O
M
MAXIMUM PEAK OUTPUT VOLTAGEvs
LOAD RESISTANCE
18
16
14
12
10
8
6
4
2
00.1 1 10
RL – Load Resistance – k Ω
16
12
8
4
0
– 4
– 8
– 12
– 16
VCC ± = ± 15 VTA = 25°C
PositiveSwing
NegativeSwing
ÁÁÁÁÁÁ
VIC
R
Figure 6 Figure 7
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1 k
V
OP27MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGEvs
FREQUENCY
OP
P –
Max
imum
Pea
k-to
-Pea
k O
utpu
t Vol
tage
– V
28
24
20
16
12
8
4
10 k 100 k 1 M 10 Mf – Frequency – Hz
010 k
OP37MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGEvs
FREQUENCY28
24
20
16
12
8
4
100 k 1 M 10 Mf – Frequency – Hz
0
ÁÁÁÁÁÁÁÁÁÁÁÁ
V O(P
P)
VO
PP
– M
axim
um P
eak-
to-P
eak
Out
put V
olta
ge –
VÁÁÁÁÁÁÁÁ
V O(P
P)
VCC ± = ± 15 VRL = 1 kΩTA = 25°C
VCC ± = ± 15 VRL = 1 kΩTA = 25°C
Figure 8 Figure 9
24002500
10
OP27A, OP27E, OP37A, OP37ELARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATIONvs
TOTAL SUPPLY VOLTAGE
A
OP27A, OP27E, OP37A, OP37ELARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATIONvs
LOAD RESISTANCE
VD
– D
iffer
entia
l Vol
tage
Am
plifi
catio
n –
V/m
V
AV
D –
Diff
eren
tial V
olta
ge A
mpl
ifica
tion
– V
/mV
0.1 1 10 100RL – Load Resistance – k ΩVCC+ – VCC – – Total Supply Voltage – V
0 20 30 40 50
2000
1500
1000
500
0
2200
2000
1800
1600
1400
1200
1000
800
600
400
VO = ± 10 VTA = 25°C
RL = 1 kΩ
VCC ± = ± 15 VVO = ± 10 VTA = 25°C
RL = 2 kΩ
Figure 10 Figure 11
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
11POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1
OP27LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFTvs
FREQUENCY25
20
15
10
5
0
– 5
10 100f – Frequency – Hz
– 100.1
OP37LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFTvs
FREQUENCY60
50
40
30
20
10
0
1 100f – Frequency – MHz
– 10
VCC± =±15 VRL = 1 kΩTA = 25°C
– D
iffer
entia
l Vol
tage
Am
plifi
catio
n –
dBA
VD
80°
100°
120°
140°
160°
180°
200°
220°
– P
hase
Shi
ft
10
80°
100°
120°
140°
160°
180°
200°
220°
Phase Shift
AVD
Phase Shift
AVD
ÁÁÁÁ
φ
– P
hase
Shi
ft
ÁÁ
φ
– D
iffer
entia
l Vol
tage
Am
plifi
catio
n –
dBA
VD
φm = 70°φm = 71°
VCC± = ±15 VRL = 1 kΩTA = 25°C
Figure 12 Figure 13
OP27A, OP27E, OP37A, OP37ELARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATIONvs
FREQUENCY
f – Frequency – Hz
VCC± = ±15 VRL = 2 kΩTA = 25°C
CM
RR
– C
omm
on-M
ode
Rej
ectio
n R
atio
– d
B
1 k
OP27A, OP27E, OP37A, OP37ECOMMON-MODE REJECTION RATIO
vsFREQUENCY
140
10 k 100 k 1 M 10 M
f – Frenquency – Hz
40
VCC± = ±15 VVIC = ± 10 VTA = 25°C
120
100
80
60
140
120
100
80
60
40
20
0
–200.1 1 10 100 1 k 10 k 1 M 100 M
– D
iffer
entia
l Vol
tage
Am
plifi
catio
n –
dBA
VD
OP37A/E
OP27A/EOP27A/E
OP37A/E
Figure 14 Figure 15
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS †
SUPPLY VOLTAGE REJECTION RATIOvs
FREQUENCY
f – Frequency – Hz
– S
uppl
y V
olta
ge R
ejec
tion
Rat
io –
dB
k
VCC± = ±4 V to ±18 VTA = 25°C
SLEW RATEvs
FREE-AIR TEMPERATURE
TA – Free Air Temperature – °C
VCC± = ±15 VRL ≥ 2 kΩ
OP37(AVD ≥ 5)
SV
R
160
140
120
100
80
60
40
20
0
20
18
16
14
12
10
8
6
4
2
01 10 100 1 k 10 k 100 k 1 M 10 M 100 M – 50 – 25 0 25 50 75 100 125
SR
– S
lew
Rat
e –
V/µ
sOP27(AVD ≥ 1)
PositiveSupply
NegativeSupply
Figure 16 Figure 17
OP37SLEW RATE
vsSUPPLY VOLTAGE
VCC± – Supply Voltage – V
AVD = 5RL = 2 kΩTA = 25°C
SR
– S
lew
Rat
e –
V/
Rise
0.1
OP37SLEW RATE
vsLOAD RESISTANCE
19
1 100f – Frequency – Hz
10
µs
SR
– S
lew
Rat
e –
V/µ
s
20
15
10
5
0
18
17
16
15± 3 ± 6 ± 9 ± 12 ± 15 ± 18 ± 21
Fall
VCC± = ±15 VAVD = 5VO(PP) = 20 VTA = 25°C
Figure 18 Figure 19
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
13POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS †
OP27PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCTvs
FREE-AIR TEMPERATURE
Gai
n-B
andw
idth
Pro
duct
– M
Hz
TA – Free-Air Temperature – °C
– 75 – 50 – 25 0 50 75 100 12525
VCC± = ±15 V
GBW (f = 100 kHz)
75°
65°
55°
45°
35°
8.6
8.2
7.8
7.4
7
Φ –
Pha
se M
argi
n
80°
75°
70°
65°
60°
55°
50°
45°
40°
35°
30°– 50 – 25 0 25 50 75 100 125
TA – Free-Air Temperature – °C
OP37PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCTvs
FREE-AIR TEMPERATURE
GBW (f = 10 kHz)
85
80
75
70
65
60
55
50
45
40
φm
ÁÁÁÁ
mφ
Φ –
Pha
se M
argi
n
ÁÁÁÁ
mφ
φm
VCC± = ±15 V
Gai
n-B
andw
idth
Pro
duct
– M
Hz
80°
70°
60°
50°
40°
85°
10.6
10.2
9.8
9.4
9
11
Figure 20 Figure 21
V
EQUIVALENT INPUT NOISE VOLTAGEvs
BANDWIDTH
VCC± = ±15 VRS = 20 ΩTA = 25°C
nV/
Hz
n –
Equ
ival
ent I
nput
Noi
se V
olta
ge –
Tota
l Equ
ival
ent I
nput
Noi
se V
olta
ge –
µV
10
1
0.1
0.010.1 1 10 100
Bandwidth – kHz(0.1 Hz to frequency indicated)
TOTAL EQUIVALENT INPUT NOISE VOLTAGEvs
SOURCE RESISTANCE
10 k1 k100
100
10
1
RS – Source Resistance – Ω
–
+
RS = R1 + R2
R1
R2
f = 1 kHzResistor Noise Only
f = 10 Hz
VCC± = ±15 VBW = 1 HzTA = 25°C
Figure 22 Figure 23† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS †
nV/
Hz
OP27A, OP27E, OP37A, OP37EEQUIVALENT INPUT NOISE VOLTAGE
vsTOTAL SUPPLY VOLTAGE
VCC+ – VCC– – Total Supply Voltage – V
RS = 20 ΩBW = 1 HzTA = 25°C
f = 10 Hz
20
15
10
5
00 10 20 30 40
f = 1 kHz
– 50 – 25 0 25 50 75 100 125
TA – Free-Air Temperature – °C
OP27A, OP27E, OP37A, OP37EEQUIVALENT INPUT NOISE VOLTAGE
vsFREE-AIR TEMPERATURE
VCC± = ±15 VRS = 20 ΩBW = 1 Hz
5
4
3
2
1
Vn
– E
quiv
alen
t Inp
ut N
oise
Vol
tage
–
nV/
Hz
Vn
– E
quiv
alen
t Inp
ut N
oise
Vol
tage
– f = 10 Hz
f = 1 kHz
Figure 24 Figure 25
nV/
Hz
Vn
– E
quiv
alen
t Inp
ut N
oise
Vol
tage
–
pA/
Hz
I n –
Equ
ival
ent I
nput
Noi
se C
urre
nt –
OP27A, OP27E, OP37A, OP37EEQUIVALENT INPUT NOISE VOLTAGE
vsFREQUENCY
1 10 100 1000
f – Frequency – Hz
EQUIVALENT INPUT NOISE CURRENTvs
FREQUENCY10
1
0.1
f – Frequency – Hz
1/f Corner = 140 Hz
10987
6
5
4
3
2
1
1/f Corner = 2.7 Hz
10 100 1 k 10 k
VCC± = ±15 VRS = 20 ΩBW = 1 HzTA = 25°C
VCC± = ±15 VBW = 1 HzTA = 25°C
Figure 26 Figure 27
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
15POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS †
0 1 2 3 4 5
60
50
40
30
20
10
SHORT-CIRCUIT OUTPUT CURRENTvs
ELAPSED TIME
SUPPLY CURRENTvs
TOTAL SUPPLY VOLTAGE
VCC+ – VCC– – Total Supply Voltage – V
TA = 125°C
5
4
3
2
15 15 25 35 45
I CC
– S
uppl
y C
urre
nt –
mA
t – Time – minutes
I OS
– S
hort
-Circ
uit O
utpu
t Cur
rent
– m
A
VCC± = ± 15 VTA = 25°C
IOS+
TA = – 55°CÁÁÁÁ
OS
I
ÁÁÁÁÁÁ
CC
I
IOS–
TA = 25°C
Figure 28 Figure 29
V
OP27VOLTAGE FOLLOWER
SMALL-SIGNALPULSE RESPONSE
80
60
40
20
0
– 20
– 40
– 60
– 80
O –
Out
put V
olta
ge –
mV
t – Time – µs0 0.5 1 1.5 2 2.5 3
VCC± = ±15 VAV = 1CL = 15 pFTA = 25°C
VO
– O
utpu
t Vol
tage
– V
OP27VOLTAGE FOLLOWER
LARGE-SIGNALPULSE RESPONSE
8
6
4
0
– 2
– 4
– 6
– 8
2
t – Time – µs0 2 4 6 8 10 12
VCC ± = ± 15 VAV = – 1TA = 25°C
Figure 30 Figure 31
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
V
OP37VOLTAGE-FOLLOWER
SMALL-SIGNAL PULSE RESPONSE80
60
40
20
0
– 20
– 40
– 60
– 80
O –
Out
put V
olta
ge –
mV
t – Time – µs0 0.2 0.4 0.6 0.8 1 1.2
VCC± = ±15 VAV = 5CL = 15 pFTA = 25°C
VO
– O
utpu
t Vol
tage
– V
OP37VOLTAGE-FOLLOWER
LARGE-SIGNAL PULSE RESPONSE8
6
4
0
– 2
– 4
– 6
– 8
2
t – Time – µs0 1 2 3 4 5 6
VCC± = ±15 VAV = 5TA = 25°C
Figure 32 Figure 33
APPLICATION INFORMATION
general
The OP27 and OP37 series devices can be inserted directly onto OP07, OP05, µA725, and SE5534 socketswith or without removing external compensation or nulling components. In addition, the OP27 and OP37 canbe fitted to µA741 sockets by removing or modifying external nulling components.
noise testing
Figure 34 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27 and OP37.The frequency response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero.Because the time limit acts as an additional zero to eliminate noise contributions from the frequency band below0.1 Hz, the test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.
Measuring the typical 80-nV peak-to-peak noise performance of the OP27 and OP37 requires the followingspecial test precautions:
1. The device should be warmed up for at least five minutes. As the operational amplifier warms up, theoffset voltage typically changes 4 µV due to the chip temperature increasing from 10°C to 20°C startingfrom the moment the power supplies are turned on. In the 10-s measurement interval, thesetemperature-induced effects can easily exceed tens of nanovolts.
2. For similar reasons, the device should be well shielded from air currents to eliminate the possibility ofthermoelectric effects in excess of a few nanovolts, which would invalidate the measurements.
3. Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect thatincreases observed noise.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
17POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise testing (continued)
4.3 kΩ
110 kΩ2.2 µF
OscilloscopeRin = 1 MΩ
22 µF
100 kΩ
0.1 µF
LT1001
4.7 µF
2 kΩ
100 kΩ
10 Ω
0.1 µF
Voltage Gain = 50,000
+
–
OP27/OP37DeviceUnderTest
24.3 kΩ
0.01 0.1 1 10 100
AV
D –
Diff
eren
tial V
olta
ge A
mpl
ifica
tion
– dB
100
90
80
70
60
50
40
30
f – Frequency – Hz
+–
NOTE: All capacitor values are for nonpolarized capacitors only.
Figure 34. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise testing (continued)
When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hznoise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading sinceboth results are determined by the white noise and the location of the 1/f corner frequency.
Figure 35 shows a circuit measuring current noise and the formula for calculating current noise.
+
–
10kΩ
Vno
100 Ω 500 kΩ
500 kΩ[Vno2 – (130 nV)2]1/2
1 MΩ × 100In =
Figure 35. Current Noise Test Circuit and Formula
offset voltage adjustment
The input offset voltage and temperature coefficient of the OP27 and OP37 are permanently trimmed to a lowlevel at wafer testing. However, if further adjustment of VIO is necessary, using a 10-kΩ nulling potentiometeras shown in Figure 36 does not degrade the temperature coefficient αVIO. Trimming to a value other than zerocreates an αVIO of VIO/300 µV/°C. For example, if VIO is adjusted to 300 µV, the change in αVIO is 1 µV/°C.
The adjustment range with a 10-kΩ potentiometer is approximately ±2.5 mV. If a smaller adjustment range isneeded, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer inconjunction with fixed resistors. The example in Figure 37 has an approximate null range of ±200 µV.
+
–
–15 V
Output
2
37
8
4
1
Input 6
15 V10 kΩ
–15 V
Output
2
37
8
4
1
Input 6
4.7 kΩ
Figure 36. Standard Input OffsetVoltage Adjustment
Figure 37. Input Offset Voltage Adjustment WithImproved Sensitivity
15 V1 kΩ
4.7 kΩ
offset voltage and drift
Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilarmetals at the contacts to the input terminals can exceed the inherent temperature coefficient ∝ VIO of theamplifier. Air currents should be minimized, package leads should be short, and the two input leads should beclose together and at the same temperature.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
19POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 38 measures offset voltage. This circuit can also be used as the burn-in configurationfor the OP27 and OP37 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, andAVD = 100.
15 V
+
–
–15 V
R150 kΩ
R2100 Ω
R350 kΩ
VO = 1000 VIO
2
36
7
4
NOTE A: Resistors must have low thermoelectric potential.
Figure 38. Test Circuit for Offset Voltage and Offset Voltage Temperature Coefficient
unity gain buffer applications
The resulting output waveform, when Rf ≤ 100 Ω and the input is driven with a fast large-signal pulse (> 1 V),is shown in the pulsed-operation diagram in Figure 39.
+
–
Rf
Output
2.8 V/µs
OP27
Figure 39. Pulsed Operation
During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectivelyshort the output to the input, and a current, limited only by the output short-circuit protection, is drawn by thesignal generator. When Rf ≥ 500 Ω, the output is capable of handling the current requirements (loadcurrent ≤ 20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. WhenRf > 2 kΩ, a pole is created with Rf and the amplifier’s input capacitance, creating additional phase shift andreducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with Rf eliminates this problem.
OP27A, OP27C, OP27E, OP27GOP37A, OP37C, OP37E, OP37GLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C – FEBRUARY 1989 – REVISED SEPTEMBER 2000
20 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
unity gain buffer applications (continued)
To GateDrive
#1
+
–
TypicalMultiplexingFET Switches
#2
+
–
#24
+
–
Cold-JunctionCircuitry
+ –
–
+Output
0.05 µF100 kΩ
High-QualitySingle-Point Ground 10 Ω
AVD = 10,000
Type S Thermocouples5.4 µV/°C at 0°C
60
40
20
00 2 4 6
Noi
se V
olta
ge –
nV 80
100
t – Time – seconds
120
8 10
OP27
NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier’s bandwidth cannot belimited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.11 µV, which is equivalent to an errorof only 0.02°C.
Figure 40. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz To 10-HzPeak-to-Peak Noise Voltage
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinueany product or service without notice, and advise customers to obtain the latest version of relevant informationto verify, before placing orders, that information being relied on is current and complete. All products are soldsubject to the terms and conditions of sale supplied at the time of order acknowledgment, including thosepertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale inaccordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extentTI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarilyperformed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operatingsafeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or representthat any license, either express or implied, is granted under any patent right, copyright, mask work right, or otherintellectual property right of TI covering or relating to any combination, machine, or process in which suchsemiconductor products or services might be or are used. TI’s publication of information regarding any thirdparty’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 2000, Texas Instruments Incorporated
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