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MAX2181A FM Automotive Low-Noise Amplifier
General DescriptionThe MAX2181A is a highly integrated FM variable-gain low-noise amplifier ideal for use in automotive FM and FM-diversity active antenna applications. The device features an FM signal path, providing 30dB of gain range, controlled by an on-chip power detector. The FM signal path covers 76MHz to 162.5MHz.The device is available in a small, 3mm x 3mm, TQFN package and operates over the extended industrial tem-perature range (-40ºC to +85ºC).
Applications AutomotiveActiveAntenna AutomotiveHeadUnit
Features +5V Supply Voltage Integrated AGC Function Eliminates
External Pin Diodes High Dynamic Range Low-Noise, Sub 3dB Noise Figure Low External BOM Small Package (3mm x 3mm TQFN) Integrated Power Detector
19-6612; Rev 0; 2/13
Simplified Block Diagram
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX2181A.related.
EVALUATION KIT AVAILABLE
DET
FMOUTPUT
MAX2181AVCC
MAX2181A FM Automotive Low-Noise Amplifier
www.maximintegrated.com Maxim Integrated 2
DC Electrical Characteristics(MAX2181A Typical Application Circuit as shown, VDD = 4.75V to 5.25V, TA = -40ºC to +85ºC, unless otherwise noted. Typical values are at VDD = 5V, TA = +25ºC.) (Note 2)
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
VDD, FMBYPASS,FMOUT......................................-0.5V to +6VShort-CircuitProtectionFMOUT .................................. IndefiniteFMIN ............................................................................. 130dBµVContinuous Power Dissipation (TA = +70ºC) 16 TQFN (derate 20.8mW/ºC above +70ºC) ..........1666.7mWθJC (Junction to Case) (Note 1) ........................................7ºC/WθJA (Junction to Ambient) (Note 1)..................................48ºC/W
Operating Temperature Range ..........................-40ºC to +105ºCJunction Temperature ...................................................... +150ºCStorage Temperature Range .............................-65ºC to +165ºCLead Temperature (TQFN only, soldering, 10s) .............. +300ºCSoldering Temperature (reflow) ....................................... +260ºC
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
CAUTION! ESD SENSITIVE DEVICE
PARAMETER CONDITIONS MIN TYP MAX UNITS
SUPPLY VOLTAGE (VDD)VDD Operational range 4.75 5 5.25 VSupply Current 56 68 mAGAIN CONTROL AND AGC CONTROL (FMDET, FMGAIN, FMAGC)
FMDETGround -65
µAVDD 50
FMGAIN
Ground -50 µA
Open 2.5 V
VDD 50 µA
FMAGCGround -50
µAVDD 50
MAX2181A FM Automotive Low-Noise Amplifier
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AC Electrical Characteristics(MAX2181A Typical Application Circuit, VDD = 4.75V to 5.25V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 5V, loadimpedance=50Ω,FMgainconnectedtoground,tunedfor87MHzto108MHz,TA = +25°C.) (Note 2)
Note 2: Min and max values are production tested at TA = -40ºC, +25ºC, and +85ºC.Note 3: Guaranteed by design and characterization.Note 4: Tuned for 76MHz to 90MHz
PARAMETER CONDITIONS MIN TYP MAX UNITS
Frequency Range 76 162.5 MHz
Power Gain Maximum
fIN = 97MHz, FMGAIN connected to VDD 6 8.3 10
dBfIN = 97MHz, FMGAIN = open 5 7.2 9
fIN = 97MHz, FMGAIN = connected to ground 4 6 8
Gain Flatness
76MHz to 90MHz (Notes 3, 4) 0.5
dB87MHz to 108MHz (Note 3) 0.5
162.5MHz relative to 97MHz 3.2
Noise Figure fIN = 97MHz, TA = +25ºC 2.5 dB
Input Return Loss 50Ωsource 10 dB
Output Return Loss 50Ωload 15 dB
Gain-Control Range fIN = 97MHz 28 32 dB
IMD3 VIN = +120dBµV/tone, +100dBµV AGC threshold, 99.5MHz and 100.5MHz tones 66 dBc
AGC Threshold (See Table 2)Minimum output threshold 92
dBµVMaximum output threshold 107
AGC Threshold Variation Relative to 97MHz tone (76MHz to 108MHz) ±0.3 dB
MAX2181A FM Automotive Low-Noise Amplifier
Maxim Integrated 4www.maximintegrated.com
Typical Operating Characteristics(MAX2181A Typical Application Circuit, VDD = 5V, tuned for 87MHz - 108MHz, FM gain connected to ground, TA = +25°C, unless other-wise noted.)
SUPPLY CURRENTvs. TEMPERATURE
MAX
2181
A to
c01
SUPP
LY C
URRE
NT (m
A)
52
53
54
55
56
57
51
TEMPERATURE (ºC)1007550250-25-50 125
VDD = 5.25V
VDD = 5.0V
VDD = 4.75V
NOISE FIGURE vs. FREQUENCY87MHz TO 108MHz TUNING
MAX
2181
A to
c04
FREQUENCY (MHz)
NOIS
E FI
GURE
(dB)
150100
2.2
2.4
2.62.8
3.0
3.23.4
3.6
3.8
4.0
2.050 200
VFMGAIN = 0V
FMGAIN = HI-ZVFMGAIN = 5V
NOISE FIGURE vs. FREQUENCY76MHz TO 90MHz TUNING
MAX
2181
A to
c07
FREQUENCY (MHz)
NOIS
E FI
GURE
(dB)
150100
2.2
2.4
2.62.8
3.0
3.23.4
3.6
3.8
4.0
2.050 200
VFMGAIN = 0V
FMGAIN = HI-Z
VFMGAIN = 5V
AGC ATTACK POINT vs. FREQUENCY87MHz TO 108MHz TUNING
MAX
2181
A to
c08
FREQUENCY (MHz)
ATTA
CK P
OINT
(dBµ
V)
100 1059590
92
94
9698
100
102104
106
108
110
9085 110
R = 71kΩ
R = 62kΩ
R = 51kΩ
R = 43kΩ
R = 33kΩR = 22kΩ
R = 13kΩR = 0Ω
OUTPUT POWER, IM2, AND IM3vs. INPUT POWER CLOSED LOOP
MAX
2181
A to
c09
OUTP
UT P
OWER
, IM2,
AND
IM3 (
dBµV
)
20
40
60
80
100
120
0
INPUT POWER (dBµV)115105958575 125
OUTPUT POWER
INPUT TONES AT99MHz AND 100MHz
IM3
IM2 (A-B)
GAIN vs. FREQUENCY76MHz TO 90MHz TUNING
MAX
2181
A to
c05
FREQUENCY (MHz)
GAIN
(dB)
150100
3
4
5
6
7
8
250 200
T = +25°C
T = +105°C
= -40°CT
T = +85°C
GAIN vs. FREQUENCY76MHz TO 90MHz TUNING
MAX
2181
A to
c06
FREQUENCY (MHz)
GAIN
(dB)
150100
3
4
5
6
7
8
9
10
250 200
VFMGAIN = 5V
VFMGAIN = 0V
FMGAIN = HI-Z
GAIN vs. FREQUENCY87MHz TO 108MHz TUNING
MAX
2181
A to
c02
GAIN
(dB)
3
4
5
6
7
8
2
FREQUENCY (MHz)15010050 200
T = +85°C
T = +25°CT = -40°C
T = +105°C
GAIN vs. FREQUENCY87MHz TO 108MHz TUNING
MAX
2181
A to
c03
FREQUENCY (MHz)
GAIN
(dB)
150100
3
4
5
6
7
8
9
10
250 200
VFMGAIN = 5V
VFMGAIN = 0V
FMGAIN = HI-Z
MAX2181A FM Automotive Low-Noise Amplifier
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Pin Description
Pin Configuration
PIN NAME FUNCTION
1 RBIAS Connecta1%tolerance20kΩresistortoground.
2 FMIN FMInput.ACcoupletoFMinputbandpassfilter.
3 GND Ground
4 FMGAIN FM Gain Trim. Connect to ground, leave open, or connect to VDD for the desired FM gain.
5–7, 9, 14–16 N.C. No Connection to Die. Suggested thermal path on Layer 1 of PCB for packages exposed pad to thermal sink.
8 FMAGC FM AGC Control Line. Connect a 1µF capacitor to ground.
10 FMOUT FM VGA Output
11 FMDET FM Attack Point Trim. Connect the desired resistor to ground.
12 FMBYPASS Connect a 10µF and 1000pF capacitor to ground.
13 VDD Supply Voltage
— EP Exposed Pad. Ground.
15
16
14
13
5
6
7
GND
FMGA
IN
8
RBIA
S
FMOU
T
N.C.
FMBY
PASS
1 3
N.C.
4
12 10 9
N.C.
N.C.
FMAGC
N.C.
N.C.
N.C.FM
INFM
DET
2
11
VDD
TQFN
MAX2181A
TOP VIEW
+
MAX2181A FM Automotive Low-Noise Amplifier
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Detailed DescriptionSetting Signal Path Gain and AGC Attack PointThe MAX2181A allows independent variation of the gain and AGC attack points on the FM signal path. Gain and attack point are adjusted by changing the conditions on the FMGAIN and FMDET pins.
FM Signal PathTypical FM gain can be set using the FMGAIN pin as shown in Table 1. The output attack point of the FM signal path is adjusted by changing the resistor RFMDET, connected to the FMDET pin. Table 2 shows the attack point associated with several resistor values.
Layout RecommendationsFor best performance, the device must be mounted on a PCB that is designed for a low thermal resistance. The backside ground of the MAX2181A should be connected to a thermal ground plane on the PCB using at least nine plated through holes. Refer to www.maximintegrated.com for the MAX2181A Evaluation Kit schematic, Gerber data, PADS layout file, and BOM information.
Table 1. FM Signal Path Gain
Table 2. FM Signal Path Attack Point
PIN FMGAIN FM GAIN (dB, TYP)
Ground 6.0
Open 7.2
VDD 8.3
RFMDET (kΩ) FM OUTPUT ATTACK POINT (dBµV, TYP)
0 92
13 93.5
22 95
33 97
43 99
51 101.5
62 104
71 107
MAX2181A FM Automotive Low-Noise Amplifier
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Typical Application Circuit
15
16
14
13
5
6
7
8
20kΩ
62Ω
FMOUTPUT
105Ω
L2C1
FM INPUT
FMIN
GND
FMGA
IN
1 3
N.C.
4
12 10 9
N.C.
N.C.
FMAGC
N.C.
N.C.
FMOU
T
FMDE
T
FMBY
PASS
FMBYPASS
2
11
VDD
MAX2181A
+N.C.
N.C.
470pF
VDD
0.1µF
10µF
1µF
C251pF
L1470µH
RBIA
SFMBYPASS
TUNINGFOR 87MHz TO 108MHz C1 = 27pF L2 = 82nHFOR 76MHz TO 90MHz C1 = 33pF L2 = 100nH
MAX2181A FM Automotive Low-Noise Amplifier
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Ordering Information Package InformationFor the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. /V denotes an automotive qualified part.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
16 TQFN T1633+2 21-0136 90-0030
PART TEMP RANGE PIN-PACKAGE
MAX2181AETE+ -40°C to +85°C 16 TQFN-EP*
MAX2181AETE/V+ -40°C to +85°C 16 TQFN-EP*
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX2181A FM Automotive Low-Noise Amplifier
© 2013 Maxim Integrated Products, Inc. 9
Revision HistoryREVISIONNUMBER
REVISIONDATE DESCRIPTION PAGES
CHANGED0 2/13 Initial release —
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.