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Low-Cost Quad Voltage-Controlled Amplifier
V2164D/M
1
1. Overview
The V2164M/D contains four independent voltage controlled amplifiers(VCAs) in a single package. High performance(100 dB dynamic range, 0.02% THD) is provided at a very low-cost-per-VCA, resulting in excellent value for cost sensitive gain control applications. Each VCA offers current input and output for maximum design flexibility, and a ground referenced –33 mV/dB control port.
The V2164M/D will operate over a wide supply voltage range of ±4 V to ±18 V. Available in 16-pin SOIC packages, the device is guaranteed for operation over the extended industrial temperature range of –40°C to +85°C.
The V2164M/D is available for many applications as Remote, Automatic, or Computer Volume Controls, Automotive Volume / Balance/Faders, Audio Mixers, Compressor / Limiters / Compandors, Noise Reduction Systems, Automatic Gain Controls, Voltage Controlled Filters, Spatial Sound Processors, Effects Processors.
Its features are:• Four High Performance VCAs in a Single Package• 0.02% THD• No External Trimming• 120 dB Gain Range• 0.07 dB Gain Matching (Unity Gain)• Class A or AB Operation
2. Block Diagram and Pin Description
2.1 Block Diagram
Power Supply and
9
8
16
1
13Iout
MODE
GND
V+
V-
107623 11 14 15
12Iout
5Iout
4Iout
VCA4VCA3VCA2VCA1
Biasing Circuitry
VC IIN VC VCIIN IIN VC IIN
V2164D/M
2
2.2 Pin Description
Pin No. Symbol Function Pin No. Symbol Function
1 MODE Mode select 9 V- negative power supply
2 IIN1 current input 1 10 IIN3 current input 3
3 VC1 voltage controller 1 11 VC3 voltage controller 3
4 IOUT1 current output 1 12 IOUT3 current output 3
5 IOUT2 current output 2 13 IOUT4 current output 4
6 VC2 voltage controller 2 14 VC4 voltage controller 4
7 IIN2 current input 2 15 IIN4 current input 4
8 GND GND 16 V+ positive power supply
3. Electrical Characteristics
3.1 Absolute Maximum Ratings
Unless otherwise specified, Tamb= 25°C
Parameter Symbol Value Unit
Supply voltage Vcc ±18 V
input, output, control voltages Vin, Vout, VCA V- ~ V+ V
Output Short Circuit Duration to GND — Indefinite S
Storage Temperature Range Tstg -65~+150 °C
Operating Temperature Range Topr -40~+85 °C
Junction Temperature Range Tj -65~+150 °C
Lead Temperature Range (Soldering 60 sec) — +300 °C
V2164D/M
3
3.2 Electrical Characteristics
Unless otherwise specified, Tamb = 25°C, VCC=±15 V, AV=0 dB, VIN=0 dBμ, RIN=ROUT=30 k Ω, f=1 kHz, using Typical Application Circuit (Class AB)
Parameter Symbol ConditionsValue
UnitMin Typ Max
Audio signal path
Noise VNO VIN=GND, BW=20 kHz -94 dBμ
Headroom Hr Clip point=1%THD+N 22 dBμ
Total Harmonic Distortion(2nd and 3rd Harmonics Only)
THD
AV=0dB, Class A 0.02 0.1 %
AV=±20dB, Class A1 0.15 %
AV=0dB, Class AB 0.16 %
AV=±20dB, Class AB1 0.3 %
Channel Separation Sep -110 dB
Unity Gain Bandwidth GB CF=10 pF 500 kHz
Slew Rate SR CF=10 pF 0.7 mA/μs
Input Bias Current IIB ±10 nA
Output Offset Current IIO VIN=0 ±50 nA
Output Compliance VOD ±0.1 V
Control port
Input Impedance Rin 5 kΩ
Gain Constant GC (note 2) -33 mV/dB
Gain Constant Temperature Coefficient
GCT -3300 ppm/°C
Control Feedthrough VCF0 dB to -40 dB Gain Range3 1.5 8.5 mV
Gain Matching, Channel-to-Channel
GMAV=0 dB 0.07
dBAV=-40 dB 0.24
Maximum Attenuation GA -100 dB
Maximum Gain GMAX +20 dB
Power supplies
Supply Voltage Range VCC ±4 ±18 V
Supply Current ICCQ Class AB 6 8 mA
Power Supply Rejection Ratio PSRR 60 Hz 90 dB
Note:
1. -10 dBμ input @ 20 dB gain, +10 dBμ input @ -20 dB gain2. After 60 seconds operation3. +25°C to +85°C
V2164D/M
4
4. Test Circuit
5. Characteristics Curve
Figure 1. THD Distribution, Class AB Figure 2. THD+N vs Frequency,Class A
Figure 3. THD+N vs Frequency, Class AB Figure 4. THD+N vs Amplitude
Power Supply and
14
15
9 8 16 1
13
Vc
I I
MODEGND V+V-
IN
0.1uF 0.1uF
560pF
100pF
IOUT
-15V +15V
(7.5kΩ Class A)Open Class AB
30kΩ
500Ω
VC4
-
+
30kΩ
VOUT4
1/2OP275
VCA4
Biasing Circuitry
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
V2164D/M
5
Figure 5. THD Distribution, Class A Figure 6. THD+N vs Supply Voltage, Class A
Figure 7. THD vs Temperature, Class A Figure 8. Voltage Noise Density vs RBIAS
Figure 9. THD vs Temperature, Class AB Figure 10. THD vs RBIAS
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
210200190180170160150140130120110100
908070605040302010
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
Vs=±15VTa=+25°C1200 Channels
Un
its
Class AVs=±15VLPF=80kHz
1.0
0.1
0.0120 100 1k 10k 20k
Frequency - Hz
THD
+N
- % Av=+20dB
Av=-20dB
Av=0dB
Figure 1 THD Distribution,Class AB Figure 2 THD+N vs. Frequency,Class A
Class ABVs=±15VLPF=80kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Frequency - Hz
THD
+N
- %
Av=+20dB Av=-20dB
Av=0dB
Av=0dBVs=±15V
LPF=22kHz
1.0
0.1
0.01
20 100 1k 10k 20k
Amplitude - Vrms
THD
+N
- %
Class AB
Class A
Figure 3 THD+N vs. Frequency,Class AB Figure 4 THD+N vs. Amplitude 300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
00.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
Vs=±15VTa=+25°C1200 Channels
-%
Un
its
THD
+N-%
- V
0.00
0.02
0.04
0.06
0.08
0.10
0 ±4 ±8 ±12 ±16 ±20
LPF=80kHz
Figure 5 THD Distribution,Class A Figure 6 THD+N vs. Supply Voltage,Class A
0.010
0.015
0.020
0.025
0.030
0.035
-40 -20 0 20 40 60 80
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
Rbias-Ω
1000
100
10
1k 10k 100k 1M
Vo
ltag
e N
ois
e D
ensi
ty
Vs=±15VTa=+25
Figure 7 THD vs. Temperature, Class A Figure 8 Voltage Noise Density vs. RBIAS
Supply VoltageTHD
-%THD
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
V2164D/M
6
Figure 11. Control Feedthrough vs RBIAS Figure 12. Voltage Noise Density vs Frequency, Class AB
Figure 13. –3 dB Bandwidth vs I-to-V Feedback Capacitor Figure 14. Gain/Phase vs Frequency
Figure 15. Slew Rate vs I-to-V Feedback Capacitor Figure 16. Gain Flatness vs Frequency
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1MG
ain-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
0.10
0.15
0.20
0.25
0.30
THD-%
Temperature-
Vs=±15VVin=0dBuAv=0dB
1000
100
101k 10k 100k 1M
THD
-%
Rbias-Ω
Ta=+25Vs=±15V
Figure 9 THD vs. temperature, Class AB Figure 10 THD vs. RBIAS
10
-5
-201k 10k 100k 1M
Co
nrto
lFee
dth
roug
h-
mV
Rbias-Ω
Ta=+25Vs=±15V
-15
-10
0
5
1 10 100 1k 10k 100k0
100
200
300
400
500
-Hz
No
ise
Rin=Rf=30kΩTa=+25
Figure 11 Control Feedthrough vs. RBIAS Figure 12 Voltage Noise Density vs. Frequency,Class AB
Page 5 of 10
Vs=±15V
Ta=25
1 10 100 100010k
100k
1M
10M
-3d
B B
W -
Hz
15
0
-15
1k 10k 100k 1M
Gai
n-
dB
-10
-5
5
10
Ta=+25Vs=±15V
Av=0dBCf=10pF
10M
Phase
Gain
Figure 13 –3 dB Bandwidth vs. I-to-V Feedback Capacitor Figure 14 Gain/Phase vs. Frequency
OP275 Output Amplifier
±Slew RateVs=±15VTa=+25
5
10
15
20
25
30
0
I to V Feedback Capacitor - pF
Slew
Rat
e-V
/µS
0.2
-0.1
-0.4
10 100 1k 10k
Gai
n-
dB
-0.3
-0.2
0
0.1Ta=+25Vs=±15V
Av=0dB
100k
Cf=10pF
Cf=100pF
Figure 15 Slew Rate vs. I-to-V Feedback Capacitor Figure 16 Gain Flatness vs. Frequency
-40 20 0 20 40 60 80
Frequency
I to V feedback capacitor — pF Frequency — Hz
Frequency — Hz1 10 10
V2164D/M
7
Figure 17. Bandwidth vs Gain Figure 18. Control Feedthrough vs Frequency
Figure 19. PSRR vs Frequency Figure 20. Supply Current vs RBIAS
Figure 21. Gain Constant vs Temperature
Page 6 of 10
60
0
-60100 1k 10k 100k
Gai
n -dB
-40
-20
20
40Ta=+25°C
Vs=±15V
Cf=10pF
1M 10M
Av=+20dB
Av=0dB
Av=-20dB
40
-20
-80
100 1k 10k 100k
-dB
-60
-40
0
20Ta=+25°CVs=±15V
Vin=0V
1M
Rf=Rin=30kΩ
Figure 17 Bandwidth vs. Gain Figure 18 Control Feedthrough vs. Frequency
20
-40
-10010 100 1k 10k
PSRR-
dB
-80
-60
-20
0Ta=+25°C
Vs=±15V
100k 1M
+PSRR
-PSRR
30
15
0
1k 10k 100k 1M
Sup
ply
Cur
ren
t-m
A
Ta=+25°C
Vs=±15V
5
10
20
25
+ISY
-ISY
Figure 19 PSRR vs. Frequency Figure 20 Supply Current vs. RBIAS
Gai
n C
ons
tan
t -m
V/d
B
Temperature-
-20
-25
-30
-35
-40
-45
0 ±4 ±8 ±12 ±16 ±2
Class A and Class ABVs=±15V
Figure 21 Gain Constant vs. Temperature
Frequency — Hz Frequency — Hz
Frequency — Hz
Rbias — Ω
Co
ntr
ol F
eed
thro
ug
h
Page 6 of 10
60
0
-60100 1k 10k 100k
Gai
n -dB
-40
-20
20
40Ta=+25°C
Vs=±15V
Cf=10pF
1M 10M
Av=+20dB
Av=0dB
Av=-20dB
40
-20
-80
100 1k 10k 100k
-dB
-60
-40
0
20Ta=+25°CVs=±15V
Vin=0V
1M
Rf=Rin=30kΩ
Figure 17 Bandwidth vs. Gain Figure 18 Control Feedthrough vs. Frequency
20
-40
-10010 100 1k 10k
PSRR-
dB
-80
-60
-20
0Ta=+25°C
Vs=±15V
100k 1M
+PSRR
-PSRR
30
15
0
1k 10k 100k 1MSu
ppl
y C
urre
nt-
mA
Ta=+25°C
Vs=±15V
5
10
20
25
+ISY
-ISY
Figure 19 PSRR vs. Frequency Figure 20 Supply Current vs. RBIAS
Gai
n C
ons
tan
t -m
V/d
B
Temperature-
-20
-25
-30
-35
-40
-45
0 ±4 ±8 ±12 ±16 ±2
Class A and Class ABVs=±15V
Figure 21 Gain Constant vs. Temperature
Frequency — Hz Frequency — Hz
Frequency — Hz
Rbias — Ω
Co
ntr
ol F
eed
thro
ug
h
Page 6 of 10
60
0
-60100 1k 10k 100k
Gai
n -dB
-40
-20
20
40Ta=+25°C
Vs=±15V
Cf=10pF
1M 10M
Av=+20dB
Av=0dB
Av=-20dB
40
-20
-80
100 1k 10k 100k
-dB
-60
-40
0
20Ta=+25°CVs=±15V
Vin=0V
1M
Rf=Rin=30kΩ
Figure 17 Bandwidth vs. Gain Figure 18 Control Feedthrough vs. Frequency
20
-40
-10010 100 1k 10k
PSRR-
dB
-80
-60
-20
0Ta=+25°C
Vs=±15V
100k 1M
+PSRR
-PSRR
30
15
0
1k 10k 100k 1M
Sup
ply
Cur
ren
t-m
A
Ta=+25°C
Vs=±15V
5
10
20
25
+ISY
-ISY
Figure 19 PSRR vs. Frequency Figure 20 Supply Current vs. RBIAS
Gai
n C
ons
tan
t -m
V/d
B
Temperature-
-20
-25
-30
-35
-40
-45
0 ±4 ±8 ±12 ±16 ±2
Class A and Class ABVs=±15V
Figure 21 Gain Constant vs. Temperature
Frequency — Hz Frequency — Hz
Frequency — Hz
Rbias — Ω
Co
ntr
ol F
eed
thro
ug
h
Page 6 of 10
60
0
-60100 1k 10k 100k
Gai
n -dB
-40
-20
20
40Ta=+25°C
Vs=±15V
Cf=10pF
1M 10M
Av=+20dB
Av=0dB
Av=-20dB
40
-20
-80
100 1k 10k 100k
-dB
-60
-40
0
20Ta=+25°CVs=±15V
Vin=0V
1M
Rf=Rin=30kΩ
Figure 17 Bandwidth vs. Gain Figure 18 Control Feedthrough vs. Frequency
20
-40
-10010 100 1k 10k
PSRR-
dB
-80
-60
-20
0Ta=+25°C
Vs=±15V
100k 1M
+PSRR
-PSRR
30
15
0
1k 10k 100k 1M
Sup
ply
Cur
ren
t-m
A
Ta=+25°C
Vs=±15V
5
10
20
25
+ISY
-ISY
Figure 19 PSRR vs. Frequency Figure 20 Supply Current vs. RBIAS
Gai
n C
ons
tan
t -m
V/d
B
Temperature-
-20
-25
-30
-35
-40
-45
0 ±4 ±8 ±12 ±16 ±2
Class A and Class ABVs=±15V
Figure 21 Gain Constant vs. Temperature
Frequency — Hz Frequency — Hz
Frequency — Hz
Rbias — Ω
Co
ntr
ol F
eed
thro
ug
h
Page 6 of 10
60
0
-60100 1k 10k 100k
Gai
n -dB
-40
-20
20
40Ta=+25°C
Vs=±15V
Cf=10pF
1M 10M
Av=+20dB
Av=0dB
Av=-20dB
40
-20
-80
100 1k 10k 100k
-dB
-60
-40
0
20Ta=+25°CVs=±15V
Vin=0V
1M
Rf=Rin=30kΩ
Figure 17 Bandwidth vs. Gain Figure 18 Control Feedthrough vs. Frequency
20
-40
-10010 100 1k 10k
PSRR-
dB
-80
-60
-20
0Ta=+25°C
Vs=±15V
100k 1M
+PSRR
-PSRR
30
15
0
1k 10k 100k 1M
Sup
ply
Cur
ren
t-m
A
Ta=+25°C
Vs=±15V
5
10
20
25
+ISY
-ISY
Figure 19 PSRR vs. Frequency Figure 20 Supply Current vs. RBIAS
Gai
n C
ons
tan
t -m
V/d
B
Temperature-
-20
-25
-30
-35
-40
-45
0 ±4 ±8 ±12 ±16 ±2
Class A and Class ABVs=±15V
Figure 21 Gain Constant vs. Temperature
Frequency — Hz Frequency — Hz
Frequency — Hz
Rbias — Ω
Co
ntr
ol F
eed
thro
ug
h
V2164D/M
8
6. Application Circuit and Information
6.1 Basic VCA Configuration
This is the basic application circuit of V2164M/D. Each of the four channels is configured identically. A 30 k Ω resistor converts the input voltage to an input current for the VCA. Additionally, a 500 Ω resistor in series with a 560 pF capacitor must be added from each input to ground to ensure stable operation. The output current pin should be maintained at a virtual ground using an external amplifier.
Power Supply and
14
15
9 8 16 1
13
Vc
I Iout
MODEGND V+V-
IN
0.1uF 0.1uF
-15V 15V
(7.5kΩ Class A)
11
10 12
Vc
I IoutIN
6
7 5
Vc
I IoutIN
3
2 4
Vc
I IoutIN
560pF
30kΩ
500Ω
VIN1
0.1uF
100kΩ
+8V
+
560pF
30kΩ
500Ω
VIN2
0.1uF
100kΩ
+8V
+
560pF
30kΩ
500Ω
VIN3
0.1uF
100kΩ
+8V
+
560pF
30kΩ
500Ω
VIN4
0.1uF
100kΩ
+8V
+
-
+
100pF
30kΩ
1/4 OP482 Vout1
-
+
100pF
30kΩ
1/4 OP482 Vout1
-
+
100pF
30kΩ
1/4 OP482 Vout1
-
+
100pF
30kΩ
1/4 OP482 Vout1
Open Class AB
VCA1
VCA2
VCA3
VCA4
Biasing Circuitry
V2164D/M
9
6.2 Low Cost, Four-Channel Mixer
The four VCAs in a single package can be configured to create a simple four-channel mixer. The inputs and control ports are configured the same as for the basic VCA, but the outputs are summed into a single output amplifier.
Additional V2164M/D could be added to increase the number of mixer channels by simply summing their outputs into the same output amplifier. Another possible configuration is to use a dual amplifier such as the OP275 to create a stereo, two channel mixer with a single V2164M/D. If additional V2164M/Ds are added, the 100 pF capacitor may need to be increased to ensure stability of the output amplifier. Most op amps are sensitive to capacitance on their inverting inputs. The capacitance forms a pole with the feedback resistor, which reduces the high frequency phase margin. As more V2164M/D’s are added to the mixer circuit, their output capacitance and the parasitic trace capacitance add, increasing the overall input capacitance. Increasing the feedback capacitor will maintain the stability of the output amplifier.
Power Supply and
14
15
9 8 16 1
13
Vc
I Iout
MODEGND V+V-
IN
0.1uF 0.1uF
-15V 15V
(7.5kΩ for class A)
11
10 12
Vc
I IoutIN
6
7 5
Vc
I IoutIN
3
2 4
Vc
I IoutIN
560pF
30kΩ
500 Ω
VIN1
560pF
30kΩ
500 Ω
VIN2
560pF
30kΩ
500 Ω
VIN3
560pF
30kΩ
500 Ω
VIN4
-
+
100pF
30kΩ
OP176 Vout1
Open for Class AB
VCA1
VCA2
VCA3
VCA4
Biasing Circuitry
V2164D/M
10
6.3 Digital Control of the V2164M/D
Using a voltage output digital-to-analog converter such as DAC8426 also can control the gain and attenuation of the V2164M/D. In Digitally Controlled system, its simple 8-bit parallel interface can easily be connected to a microcontroller or microprocessor, The coltage output of D/A provedes a low impenence drive to the V2164M/D, so the attenuation can be controlled accurately. The input and output configuration for the V2164M/D is the same as for the basic VCA circuit shown. The 4-to-1 mixer configuration could also be used.
10V Reference
Latch A
Latch B
Latch C
Latch D
Logic
DAC A
DAC B
DAC C
DAC D
-
+
-
+
-
+
-
+
Vss AGND DGND
Vout A
Vout B
Vout C
Vout D
VrefOUT+10V Vod
MSB
LAB
___
A1A0
+15V
WR
7
14
151617
3 5 6
19
20
1
2
4 18
Power Supply and
14
15
9 8 16 1
13
Vc
I Iout
MODEGND V+V-
IN
0.1uF 0.1uF
-15V 15V
(7.5kΩ Class A)
11
10 12
Vc
I IoutIN
6
7 5
Vc
I IoutIN
3
2 4
Vc
I IoutIN
DAC8426
Data Bus
Control
Biasing Circuitry
Open Class AB
V2164D/M
11
6.4 V2164M/D Single Supply Operation
The V2164M/D can easily be operated from a single power supply as low as +8 V or as high as +36 V. The key to using a single supply is to reference all groung connection to a voltage midway between the supplyand ground, as shown above. The OP176 is used to create a pseude-ground reference for the V2164M/D. Both the OP482 and OP176 are single supply amplifiers and can operate over the same voltage range as the V2164M/D, with little or no change in performance.
V+
MODE
GND
V-
V+=+8V
Rb1.8kΩ for class Aopen for class B
Rb
100pF
Vout-
+1/4 OP482
-
+
-
+
OP176V+/2
to additional OP482
V+
10kΩ
10kΩ10uF
V+Vc
0dB gain at Vc=V+/2
560pF
30kΩ
500ΩVIN
10uF
+
V2164D/M
12
7. Package Dimensions
19.4 max
10.8 max 3.9
6±0.2A
1.8±
0.2
0.705 Typ
V2164D
1.27
0.2
1.05
0.55
0.2
16
1
9
8
1.0 1.4 0.5±0.070.25±0.057.70~8.80
16
1
9
8
2.54
7.62±0.25
0.43±0.1
3.3
3.5
7.3
max
1.75
max
6.4±
0.15
V2164D