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19-1407; Rev 3; 8/99
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
General Description
The MAX4174/MAX4175/MAX4274/MAX4275 GainAmpTM family combines a low-cost Rail-to-Rail(R) op amp with precision internal gain-setting resistors and VCC / 2 biasing. Factory-trimmed on-chip resistors decrease design size, cost, and layout, and provide 0.1% gain accuracy. Fixed inverting gains from -0.25V/V to -100V/V or noninverting gains from +1.25V/V to +101V/V are available. These devices operate from a single +2.5V to +5.5V supply and consume only 300A. GainAmp amplifiers are optimally compensated for each gain version, achieving exceptional GBW products up to 23MHz (AV = +25V/V to +101V/V). High-voltage fault protection withstands 17V at either input without excessive current draw. Three versions are available in this amplifier family: single/ dual/quad open-loop, unity-gain stable (MAX4281/ MAX4282/MAX4284); single/dual fixed gain (MAX4174/ MAX4274); and single/dual fixed gain plus internal V CC / 2 bias at the noninverting input (MAX4175/ MAX4275), which simplifies input biasing in single-supply designs. The input common-mode voltage range of the open-loop amplifiers extends from 150mV below the negative supply to within 1.2V of the positive supply. The outputs can swing rail-to-rail and drive a 1k load while maintaining excellent DC accuracy. The amplifier is stable for capacitive loads up to 470pF.
Features
o GainAmp Family Provides Internal Precision Gain-Setting Resistors in SOT23 (MAX4174/5) o 0.1% Gain Accuracy (RF/RG) (MAX4174/5, MAX4274/5) o 54 Standard Gains Available (MAX4174/5, MAX4274/5) o Open-Loop Unity-Gain-Stable Op Amps (MAX4281/2/4) o Rail-to-Rail Outputs Drive 1k Load o Internal VCC / 2 Biasing (MAX4175/MAX4275) o +2.5V to +5.5V Single Supply o 300A Supply Current o Up to 23MHz GBW Product o Fault-Protected Inputs Withstand 17V o Stable with Capacitive Loads Up to 470pF with No Isolation Resistor
MAX4174/5, MAX4274/5, MAX4281/2/4
Ordering Information
PART* TEMP. RANGE PINPACKAGE 5 SOT23-5 5 SOT23-5 TOP MARK

Applications
Portable Instruments Instruments, Terminals, and Bar-Code Readers Keyless Entry Photodiode Preamps Smart-Card Readers Infrared Receivers for Remote Controls Low-Side Current-Sense Amplifiers
MAX4174_EUK-T -40C to +85C MAX4175_EUK-T -40C to +85C
Ordering Information continued at end of data sheet. * Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number. Refer to the Gain Selection Guide for a list of preferred gains and SOT Top Marks. Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
Typical Operating Circuit
+5V VCC 0.1F
MAX4174
OUT 1 RF + VEE 2 RG IN+ 3 4 IN0.1F RB INPUT 0.1F INRG IN+ 5 VCC RB
VCC
MAX4175
OUT VEE RF VEE
SOT23-5
Pin Configurations continued at end of data sheet.
Patent pending
GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ....................................-0.3V to +6V Voltage Inputs (IN_) MAX4281/4282/4284.....................(VEE - 0.3V) to (VCC + 0.3V) MAX4174/4175/4274/4275 (with respect to GND) ...........17V Output Short-Circuit Duration (OUT_).....................................Continuous to Either VEE or VCC Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C).............571mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW 8-Pin MAX (derate 4.1mW/C above +70C) ............330mW 14-Pin SO (derate 8.3mW/C above +70C)...............667mW 16-Pin QSOP (derate 8.3mW/C above +70C)..........667mW Operating Temperature Range ...........................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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.
ELECTRICAL CHARACTERISTICS--MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain Amplifiers
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1) PARAMETER Supply Voltage Range Supply Current (per Amplifier) Input Offset Voltage Input Offset Voltage Drift Input Bias Current Inverting Input Resistance Noninverting Input Resistance IN_+ Bias Voltage IN_+ Input Voltage Range IN_- Input Voltage Range Power-Supply Rejection Ratio Closed-Loop Output Impedance Short-Circuit Current PSRR ROUT Shorted to VEE Shorted to VCC RL = 100k VOH/VOL RL = 1k VCC - VOH VOL - VEE VCC - VOH VOL - VEE IBIAS IN_+, MAX4174/MAX4274 (Note 2) AV < 25V/V AV > 25V/V MAX4174/MAX4274 MAX4175/MAX4275 MAX4175/MAX4275, VIN+ = VINGuaranteed by functional test (Note 3) Guaranteed by functional test VCC = 2.5V to 5.5V VCC / 2 - 0.25 VEE VEE 70 90 0.02 10 65 2 2 150 60 8 8 250 150 mV SYMBOL VCC CONDITIONS Guaranteed by PSRR tests MAX4174/MAX4274 ICC MAX4175/MAX4275, includes VCC / 2 bias resistors RL = 100k VCC = 3V VCC = 5V VCC = 3V VCC = 5V MIN 2.5 300 330 320 355 0.5 5 0.05 150 40 1000 75 VCC / 2 + 0.25 VCC - 1.2 VCC 10 TYP MAX 5.5 460 510 480 530 2.5 mV V/C nA k M k V V V dB mA A UNITS V
VOS
Output Voltage Swing (Note 4)
2
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS--MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain Amplifiers (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical PARAMETER Power-Up Time Slew Rate Settling Time to Within 0.01% Input Noise Voltage Density Input Noise Current Density Capacitive Load Stability DC Gain Accuracy en in CLOAD SR SYMBOL CONDITIONS Output settling to 1% VCC = 5V, VOUT = 4V step VCC = 5V, VOUT = 4V step f = 10kHz (Note 5) f = 10kHz No sustained oscillations (VEE + 25mV) < VOUT < (VCC - 25mV), RL = 100k (Note 6) Gain = +1.25V/V Gain = +3V/V -3dB Bandwidth BW-3dB Gain = +5V/V Gain = +10V/V Gain = +25V/V Gain = +51V/V MIN TYP 1 0.7 7 90 4 470 0.1 1700 970 970 640 590 330 kHz 0.5 MAX UNITS ms V/s s nV/Hz fA/Hz pF %
MAX4174/5, MAX4274/5, MAX4281/2/4
ELECTRICAL CHARACTERISTICS--MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1) PARAMETER Supply Voltage Range Supply Current (per Amplifier) Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Current Input Resistance Input Capacitance Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Closed-Loop Output Impedance IBIAS IOS RIN CIN CMVR CMRR PSRR ROUT Guaranteed by CMRR test VEE - 0.15V VCM VCC - 1.2V VCC = 2.5V to 5.5V AV = 1V/V VEE - 0.15 60 70 90 90 0.02 Differential or common mode SYMBOL VCC ICC VOS VCC = 3V VCC = 5V RL = 100k CONDITIONS Guaranteed by PSRR tests MIN 2.5 290 320 0.5 5 0.05 10 1000 2.5 VCC - 1.2 10 1000 TYP MAX 5.5 450 500 2 UNITS V A A mV V/C nA pA M pF V dB dB
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3
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
ELECTRICAL CHARACTERISTICS--MAX4281/MAX4282/MAX4284 Open-Loop Op Amps (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1) PARAMETER Short-Circuit Current Large-Signal Voltage Gain AVOL SYMBOL CONDITIONS Shorted to VEE Shorted to VCC VEE + 0.05V < VOUT < VCC - 0.1V, RL = 100k VEE + 0.25V < VOUT < VCC - 0.3V, RL = 1k RL = 100k Output Voltage Swing VOH/VOL RL = 1k Gain Bandwidth Product Slew Rate Settling Time to within 0.01% Input Noise Voltage Density Input Noise Current Density Capacitive Load Stability Power-Up Time en in CLOAD GBW SR VCC = 5V, VOUT = 4V step VCC = 5V, VOUT = 4V step f = 10kHz f = 10kHz No sustained oscillations, AV = 1V/V Output settling to 1% VCC - VOH VOL - VEE VCC - VOH VOL - VEE MIN TYP 10 65 120 100 2 2 160 60 2 0.7 7 60 1.8 470 1 8 8 250 100 MHz V/s s nV/Hz fA/Hz pF ms mV MAX UNITS mA mA dB dB
90 80
Note 1: MAX4174/MAX4175/MAX4281 and MAX4274/MAX4275/MAX4282 and MAX4284 are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Note 2: Guaranteed by design. Note 3: The input common-mode range for IN_+ is guaranteed by a functional test. A similar test is done on the IN_- input. See the Applications Information section for more information on the input voltage range of the GainAmp. Note 4: For AV = -0.5V/V and AV = -0.25V/V, the output voltage swing is limited by the input voltage range. Note 5: Includes noise from on-chip resistors. Note 6: The gain accuracy test is performed with the GainAmp in noninverting configuration. The output voltage swing is limited by the input voltage range for certain gains and supply voltage conditions. For situations where the output voltage swing is limited by the valid input range, the output limits are adjusted accordingly.
Typical Operating Characteristics
(VCC = +5V, RL = 100k to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25C, unless otherwise noted.)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC01
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC02
LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +9V/V AV = +5V/V
MAX4174 TOC03
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1k 10k 100k FREQUENCY (Hz) 1M AV = +2.25V/V AV = +1.25V/V
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +4V/V AV = +2.5V/V
4
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
4
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 100k to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25C, unless otherwise noted.)
MAX4174/MAX4175
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC04
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC05
LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +100V/V AV = +51V/V
MAX4174 TOC06
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1k 10k 100k FREQUENCY (Hz) 1M AV = +21V/V AV = +10V/V
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +50V/V AV = +25V/V
4
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC07
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC08
SMALL-SIGNAL GAIN vs. FREQUENCY
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +9V/V AV = +5V/V
MAX4174 TOC09
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1k 10k 100k FREQUENCY (Hz) 1M AV = +2.25V/V AV = +1.25V/V
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +4V/V AV = +2.5V/V
4
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC10
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4174 TOC11
SMALL-SIGNAL GAIN vs. FREQUENCY
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +100V/V AV = +51V/V
MAX4174 TOC12
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1k 10k 100k FREQUENCY (Hz) 1M AV = +21V/V AV = +10V/V
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AV = +50V/V AV = +25V/V
4
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
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5
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 100k to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25C, unless otherwise noted.)
MAX4174/MAX4175
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4174 TOC13
TOTAL HARMONIC DISTORTION vs. FREQUENCY
VOUT = 1Vp-p -20 -40 THD (dB) -60 -80 -100 AV = +25V/V
MAX4174 TOC14
0 VOUT = 1Vp-p -20 -40 THD (dB) -60 -80 -100 AV = +3V/V -120 1k 10k 100k
0
AV = +10V/V AV = +1.25V/V
AV = +51V/V
-120 1M 1k 10k 100k 1M FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING
MAX4174 TOC15
TOTAL HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING
f = 10kHz
MAX4174 TOC16
-60 f = 10kHz -70 -80 THD (dB) -90 AV = +1.25V/V -100 AV = +3V/V -110 -120 0 AV = +10V/V
-60 -70
AV = +51V/V -80 THD (dB) -90 AV = +25V/V -100 -110 -120 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VOLTAGE SWING (Vp-p) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VOLTAGE SWING (Vp-p)
VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +1.25, +3, +10)
MAX4174/5 toc 17
VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +25, +51)
MAX4174/5 toc 18
CURRENT NOISE DENSITY vs. FREQUENCY
MAX4174/5 toc19
1000 VOLTAGE NOISE DENSITY (nV/Hz)
1000 VOLTAGE NOISE DENSITY (nV/Hz)
10 CURRENT NOISE DENSITY (fA/Hz) 1 1
AV = +10V/V 100
AV = +3V/V
AV = +25V/V 100
AV = +1.25V/V
AV = +51V/V
INCLUDES RESISTOR NOISE 10 1 10 100 1k 10k 100k FREQUENCY (Hz) 10 1 10 100 1k 10k 100k FREQUENCY (Hz) 10 100 1k 10k 100k
FREQUENCY (Hz)
6
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 100k to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25C, unless otherwise noted.)
MAX4174/5, MAX4274/5, MAX4281/2/4
MAX4174/MAX4175
LARGE-SIGNAL PULSE RESPONSE
MAX4174/5 toc 20
SMALL-SIGNAL PULSE RESPONSE
MAX4174/5 toc 21
INPUT VOLTAGE
INPUT VOLTAGE
AV = +1.25V/V OUTPUT 500mV/div
AV = +1.25V/V OUTPUT 50mV/div
AV = +3V/V OUTPUT 50mV/div
AV = +3V/V OUTPUT 50mV/div
AV = +5V/V OUTPUT 500mV/div
AV = +5V/V OUTPUT 50mV/div
AV = +10V/V OUTPUT 500mV/div
AV = +10V/V OUTPUT 50mV/div
AV = +25V/V OUTPUT 500mV/div
AV = +25V/V OUTPUT 50mV/div
AV = +51V/V OUTPUT 500mV/div
AV = +51V/V OUTPUT 50mV/div
2s/div CL = 0
2s/div CL = 0
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7
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 100k to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25C, unless otherwise noted.)
MAX4174/MAX4175/MAX4281/MAX4282/MAX4284
POWER-SUPPLY REJECTION vs. FREQUENCY
MAX4174 TOC22
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4174 TOC23
OUTPUT VOLTAGE SWING vs. RLOAD
4.9 4.8 4.7 VSWING (Vp-p) 4.6 4.5 4.4 4.3
MAX4174 TOC24
-70
100
5.0
-75
OUTPUT IMPEDANCE ()
10
PSR (dB)
-80
1
-85
-90
0.1 0.01 100 1k 10k FREQUENCY (Hz) 100k 1M 100 1k 10k FREQUENCY (Hz) 100k 1M
4.2 4.1
-95
4.0 1 10 RLOAD (k) 100
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4174/5 toc 25
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4174/5 toc 26
200 150 INPUT OFFSET VOLTAGE (V) 100 50 0 -50 -100 -150 -200 -50 -35 -20 -5 10 25 40 55 70 VCC = 2.5V VCC = 5.5V
1000 800 INPUT BIAS CURRENT (pA) 600 VCC = 5.5V 400 200 0 -200 VCC = 2.5V
85
-45 -30 -15
0
15
30
45
60
75
90
TEMPERATURE (C)
TEMPERATURE (C)
SUPPLY CURRENT vs. TEMPERATURE
MAX4174/5 toc 27
VOH AND VOL vs. TEMPERATURE (VCC = 2.5V)
MAX4174/5 toc 28
VOH AND VOL vs. TEMPERATURE (VCC = 5.5V)
200 180 160 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100
MAX4174/5 toc 29
380 360 SUPPLY CURRENT (A) 340 320 300 280 260 240 -50 -35 -20 -5 10 25 40 55 70 VCC = 3V VCC = 2.5V VCC = 5.5V VCC = 5V VCC = 4V
100 80 60 40 VOLTAGE (mV) 20 0 -20 -40 -60 -80 -100 VOL, RL = 100k VOL, RL = 1k VOL, RL = 10k VOH, RL = 10k VOH, RL = 1k VOH, RL = 100k
VOH, RL = 1k
VOLTAGE (mV)
VOH, RL = 100k VOH, RL = 10k VOL, RL = 100k
VOL, RL = 100k VOL, RL = 1k -50 -35 -20 -5 10 25 40 55 70 85
85
-50 -35 -20
-5
10
25
40
55
70
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
8
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Typical Operating Characteristics
(VCC = +5V, RL = 100k to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25C, unless otherwise noted.)
MAX4281/MAX4282/MAX4284
OPEN-LOOP GAIN AND PHASE vs. FREQUENCY
160 140 120 100 80 60 40 20 0 -20 -40
MAX4174/5 toc30
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4174/5 toc31
LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6
MAX4174/5 toc32
4 3 2 PHASE (degrees) 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 1k 10k 100k FREQUENCY (Hz) 1M
4
OPEN-LOOP GAIN (dB)
1
10
100
1k
10k
100k
1M
0 -45 -90 -135 -180 -225 -270 -315 10M
10M
1k
10k
100k FREQUENCY (Hz)
1M
10M
FREQUENCY (Hz)
COMMON-MODE REJECTION vs. FREQUENCY
MAX4174/5 toc33
VOLTAGE NOISE DENSITY vs. FREQUENCY
MAX4174/5 toc34
CURRENT NOISE DENSITY vs. FREQUENCY
MAX4174/5 toc35
0 -10 -20 -30 CMR (dB) -40 -50 -60 -70 -80 -90 -100 100 1k 10k 100k 1M
1000 VOLTAGE NOISE DENSITY (nV/Hz)
10 CURRENT NOISE DENSITY (fA/Hz) 1 1
100
10 10M 1 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz)
10
100
1k
10k
100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION vs. FREQUENCY
0 AV = 1 -10 VOUT = 1Vp-p -20 -30 THD (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120 1k 10k 100k 1M FREQUENCY (Hz)
MAX4174/5 toc36
MAX4282 CROSSTALK vs. FREQUENCY
MAX4174/5 toc37
MAX4284 CROSSTALK vs. FREQUENCY
THREE AMPLIFIERS DRIVEN, ONE OUTPUT MEASURED
MAX4174/5 toc38
-50 -55 -60 CROSSTALK (dB) -65 -70 -75 -80 -85 -90 -95 1k 10k 100k FREQUENCY (Hz) 1M
-50
-55 CROSSTALK (dB)
-60
-65
-70
-75 10M 1k 10k 100k FREQUENCY (Hz) 1M 10M
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9
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Pin Description
PIN MAX4281 5 SOT23 8 SO MAX4174/ MAX4175 5 SOT23 MAX4282 8 SO/MAX MAX4274/ MAX4275 8 SO/MAX MAX4284 14 SO/TSSOP 1, 7, 8, 14 16 QSOP 1, 7, 10, 16 NAME NAME OUT, OUTA, OUTB, OUTC, OUTD VEE FUNCTION FUNCTION
1
6
1
1, 7
1, 7
Amplifier Output
2
4
2
4
4
11
13
Negative Supply or Ground Noninverting Amplifier Input. Internally biased to VCC / 2 for MAX4175/MAX4275 Inverting Amplifier Input. Connects to RG for MAX4174/ 4175/4274/4275. Positive Supply No Connection. Not internally connected.
3
3
3
3, 5
3, 5
3, 5, 10, 12
3, 5, 12, 14
IN+, INA+, INB+, INC+, IND+
4
2
4
2, 6
2, 6
2, 6, 9, 13 4
--
2, 6, 11, 15 4 8, 9
IN-, INA-, INB-, INC-, INDVCC N.C.
5
--
7 1, 5, 8
5
--
8 --
8 --
Functional Diagrams
VCC VCC VCC IN+ OUT ININVEE VEE IN-
VCC
IN+
MAX4281
MAX4174
OUT IN+
RB
150k
MAX4175
RB RG RF VEE RG
150k
OUT
RF
VEE
10
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
Detailed Description
Maxim's GainAmp fixed-gain amplifiers combine a lowcost rail-to-rail op amp with internal gain-setting resistors. Factory-trimmed on-chip resistors provide 0.1% gain accuracy while decreasing design size, cost, and layout. Three versions are available in this amplifier family: single/dual/quad open-loop, unity-gain-stable devices (MAX4281/MAX4282/MAX4284); single/dual fixed-gain devices (MAX4174/MAX4274); and single/ dual devices with fixed gain plus internal VCC / 2 bias at the noninverting input (MAX4175/MAX4275). All amplifiers feature rail-to-rail outputs and drive a 1k load while maintaining excellent DC accuracy. ly increases usable bandwidth, while decompensation above gains of +25V/V offers diminished returns.
MAX4174/5, MAX4274/5, MAX4281/2/4
Open-Loop Op Amps
The single/dual/quad MAX4281/MAX4282/MAX4284 are high-performance, open-loop op amps with rail-torail outputs. These devices are compensated for unitygain stability, and feature a gain bandwidth (GBW) of 2MHz. The op amps in these ICs feature an input common-mode range that extends from 150mV below the negative rail to within 1.2V of the positive rail. These high performance op amps serve as the core for this family of GainAmp fixed-gain amplifiers. Although the -3dB bandwidth will not correspond to that of a fixedgain amplifier in higher gain configurations, these open-loop op-amps can be used to prototype designs.
VCC / 2 Internal Bias The MAX4175/MAX4275 GainAmp fixed-gain amplifiers with the VCC / 2 bias option are identical to standard GainAmp fixed-gain amplifiers, with the added feature of VCC / 2 internal bias at the noninverting inputs. Two 150k resistors form a voltage-divider for self-biasing the noninverting input, eliminating external bias resistors for AC-coupled applications, and allowing maximum signal swing at the op amp's rail-to-rail output for single-supply systems (see Typical Operating Circuit). For DC-coupled applications, use the MAX4174/ MAX4274. High-Voltage (17V) Input Fault Protection
The MAX4174/MAX4175/MAX4274/MAX4275 include 17V input fault protection. For normal operation, see the input voltage range specification in the Electrical Characteristics. Overdriven inputs up to 17V will not
VCC -RF RG
AV = RF
RG IN-
R AV = 1 + F RG
Internal Gain-Setting Resistors
Maxim's proprietary laser trimming techniques produce the necessary RF/RG values (Figure 1), so many gain offerings are easily available. These GainAmp fixed-gain amplifiers feature a negative-feedback resistor network that is laser trimmed to provide a gain-setting feedback ratio (RF/RG) with 0.1% typical accuracy. The standard op amp pinouts allow the GainAmp fixed-gain amplifiers to drop in directly to existing board designs, easily replacing op-amp-plus-resistor gain blocks.
VEE OUT IN+
Figure 1. Internal Gain-Setting Resistors
60 50 40 -3dB 30 20 10 0 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 20kHz 230kHz MAX4281, AV = 100 2MHz GBW MAX4174, AV = 100 23MHz GBW
GainAmp Bandwidth
GainAmp fixed-gain amplifiers feature factory-trimmed precision resistors to provide fixed inverting gains from -0.25V/V to -100V/V or noninverting gains from +1.25V/V to +101V/V. The op-amp core is decompensated strategically over the gain-set options to maximize bandwidth. Open-loop decompensation increases GBW product, ensuring that usable bandwidth is maintained with increasing closed-loop gains. A GainAmp with a fixed gain of AV = 100V/V has a -3dB bandwidth of 230kHz. By comparison, a unity-gain-stable op amp configured for AV = 100V/V would yield a -3dB bandwidth of only 20kHz (Figure 2). Decompensation is performed at five intermediate gain sets, as shown in the Gain Selection Guide. Low gain decompensation great-
Figure 2. Gain-Bandwidth Comparison
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GAIN (dB)
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
cause output phase reversal. A back-to-back SCR structure at the input pins allows either input to safely swing 17V relative to VEE (Figure 3). Additionally, the internal op-amp inputs are diode clamped to either supply rail for the protection of sensitive input stage circuitry. Current through the clamp diodes is limited by a 5k resistor at the noninverting input, and by RG at the inverting input. An IN+ or IN- fault voltage as high as 17V will cause less than 3.5mA of current to flow through the input pin, protecting both the GainAmp and the signal source from damage.
GainAmp Input Voltage Range
The MAX4174/MAX4175/MAX4274/MAX4275 combine both an op amp and gain-setting feedback resistors on the same chip. Because the inverting input pin is actually tied to the RG input series resistor, the inverting input voltage range is different from the noninverting input voltage range. Just as with a discrete design, care must be taken not to saturate the inputs/output of the core op amp, to avoid signal distortions or clipping. The inverting inputs (IN_-) of the MAX4174/MAX4175/ MAX4274/MAX4275 must be within the supply rails or signal distortion may result. The GainAmp's inverting input structure includes diodes to both supplies, such that driving the inverting input beyond the rails may cause signal distortions (Figure 1). For applications that require sensing voltages beyond the rails, use the MAX4281/MAX4282/MAX4284 open-loop op amps (Figure 4).
Applications Information
GainAmp fixed-gain amplifiers offer a precision, fixed gain amplifier in a small package that can be used in a variety of circuit board designs. GainAmp fixed-gain amplifiers can be used in many op amp circuits that use resistive negative feedback to set gain, and that do not require other connections to the op-amp inverting input. Both inverting and noninverting op-amp configurations can be implemented easily using a GainAmp.
RF
IN17V SCR
RG
VCC VEE
VCC
MAX4174 MAX4175 MAX4274 MAX4275
OUT
IN+ 17V SCR
5k
VEE
VEE
VEE
NOTE: INPUT STAGE PROTECTION INCLUDES TWO 17V SCRs AND TWO DIODES AT THE INPUT STAGE.
BIAS RESISTORS (MAX4175/MAX4275 ONLY)
Figure 3. Input Protection
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
MAX4281
VCC RB VCC - VIN 2 VCC
MAX4175
VCC VIN RG RF VOUT = -RF (VIN) RG
0.1F
VOUT = RB
( RFG ) R
VIN RG RF
Figure 4. Single-Supply, DC-Coupled Inverting Amplifier with Negative Input Voltage
Figure 6. Single-Supply, AC-Coupled Inverting Amplifier
MAX4174
VCC VOUT = - VIN VCC VIN
MAX4174
R VOUT = VIN 1+ F RG
( RRFG )
VEE RF
(
)
VEE VIN RG RF RG
Figure 5. Dual-Supply, DC-Coupled Inverting Amplifier
Figure 7. Dual-Supply, AC-Coupled Noninverting Amplifier
GainAmp Signal Coupling and Configurations
Common op-amp configurations include both noninverting and inverting amplifiers. Figures 5-8 show various single and dual-supply circuit configurations. Single-supply systems benefit from a midsupply bias on the noninverting input (provided internally on MAX4175/MAX4275), as this produces a quiescent DC level at the center of the rail-to-rail output stage signal swing. For dual-supply systems, ground-referenced signals may be DC-coupled into the inverting or noninverting inputs.
IN_+ Filter on MAX4175/MAX4275
Internal resistor biasing of the VCC / 2 bias options couples power-supply noise directly to the op amp's noninverting input. To minimize high-frequency power-supply noise coupling, add a 1F to 0.1F capacitor from IN+ to ground to create a lowpass filter (Figure 6). The lowpass filter resulting from the internal bias resistors and added capacitor can help eliminate higher frequency power-supply noise coupling through the noninverting input.
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Supply Bypassing and Board Layout
All devices in the GainAmp family operate from a +2.5V to +5.5V single supply or from 1.25V to 2.75V dual supplies. For single-supply operation, bypass the power supply with a 0.1F capacitor to ground. For dual supplies, bypass each supply to ground. Bypass with capacitors as close to the device as possible, to minimize lead inductance and noise. A printed circuit board with a low-inductance ground plane is recommended. gain amplifiers of this GainAmp family are stable with capacitive loads up to 470pF. Stability with higher capacitive loads can be improved by adding an isolation resistor in series with the op-amp output, as shown in Figure 9. This resistor improves the circuit's phase margin by isolating the load capacitor from the amplifier's output. In Figure 10, a 1000pF capacitor is driven with a 100 isolation resistor exhibiting some overshoot but no oscillation. Figures 11 and 12 show the typical small-signal pulse responses of GainAmp fixed-gain amplifiers with 250pF and 470pF capacitive loads and no isolation resistor.
Capacitive-Load Stability
Driving large capacitive loads can cause instability in most low-power, rail-to-rail output amplifiers. The fixed-
MAX4174
VCC VIN R VOUT = VIN 1+ F RG INPUT
(
)
AV = +5V/V 50mV/div OUTPUT
VEE
RF RG
AV = +5V/V 500mV/div
OUTPUT
Figure 8. Dual-Supply, DC-Coupled Noninverting Amplifier
Figure 10. Small-Signal/Large-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor
MAX4174
RG RF
VCC RISO INPUT VEE CL OUTPUT RL
Figure 9. Dual-Supply, Capacitive-Load Driving Circuit
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
INPUT
INPUT
AV = +1.25V/V OUTPUT 50mV/div
AV = +1.25V/V OUTPUT 50mV/div
AV = +3V/V OUTPUT 50mV/div
AV = +3V/V OUTPUT 50mV/div
AV = +5V/V OUTPUT 50mV/div
AV = +5V/V OUTPUT 50mV/div
AV = +10V/V OUTPUT 50mV/div
AV = +10V/V OUTPUT 50mV/div
AV = +25V/V OUTPUT 50mV/div
AV = +25V/V OUTPUT 50mV/div
AV = +51V/V OUTPUT 50mV/div
AV = +51V/V OUTPUT 50mV/div
2s/div
2s/div
Figure 11. MAX4174/MAX4175 Small-Signal Pulse Response (CL = 250pF, RL = 100k)
Figure 12. MAX4174/MAX4175 Small-Signal Pulse Response (CL = 470pF, RL = 100k)
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Gain Selection Guide
GAIN CODE AB* AC AD* AE AF AG* AH AJ AK* AL AM AN AO* BA* BB BC BD BE* BF BG BH BJ* BK* BL BM BN* CA* RF/RG INVERTING GAIN 0.25 0.5 1 1.25 1.5 2 2.5 3 4 5 6 8 9 10 12.5 15 20 24 25 30 40 49 50 60 80 99 100 1+ (RF/RG) NONINVERTING GAIN 1.25 1.5 2 2.25 2.5 3 3.5 4 5 6 7 9 10 11 13.5 16 21 25 26 31 41 50 51 61 81 100 101 -3dB BW (kHz) 1700 1280 590 450 1180 970 820 690 970 790 640 480 640 560 460 390 300 590 580 510 390 310 330 310 260 230 230 TOP MARK MAX4174 ACDS ACDT ACDU ACDV ACDW ACDX ACDY ACDZ ACEA ACEB ACEC ACED ACEE ACEF ACEG ACEH ACEI ACEJ ACEK ACEL ACEM ACEN ACEO ACEP ACEQ ACER ACES MAX4175 ACET ACEU ACEV ACEW ACEX ACEY ACEZ ACFA ACFB ACFC ACFD ACFE ACFF ACFG ACFH ACFI ACFJ ACFK ACFL ACFM ACFN ACFO ACFP ACFQ ACFR ACFS ACFT
Note: Gains in the noninverting configuration are 1+ (RF/RG) and range from +1.25V/V to +101V/V. For a +1V/V gain, use the MAX4281/MAX4282/MAX4284. * Preferred Gains. These gain versions are available as samples and in small quantities. The -3dB bandwidth is the same for inverting and noninverting configurations.
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
Pin Configurations (continued)
TOP VIEW
MAX4174/5, MAX4274/5, MAX4281/2/4
MAX4175
OUT 1 5 VCC OUT 1
MAX4281
5 VCC
+VEE 2 R IN+ 3 R VCC
RF VEE 2 RG 4 IN+ 3 4 IN-
+-
SOT23-5
SOT23-5
MAX4281
N.C. 1 8 N.C. OUTA 1
MAX4282
8 VCC OUTA 1 RF
MAX4274
8 VCC
-+
IN- 2 7 VCC INA- 2 7 OUTB INA- 2 RG
-+
7 OUTB
+6 OUT INA+ 3 6 INBINA+ 3
+-
RF 6 INB-
-+
IN+ 3
RG
VEE 4
5
N.C.
VEE 4
5
INB+
VEE 4
5
INB+
SO
MAX/SO
MAX/SO
MAX4275
OUTA 1 RF RG INA- 2 VCC R INA+ 3 R VEE 4 R VCC R 5 INB+ 8 VCC OUTA 1 INA- 2 7 OUTB INA+ 3 6 INBVCC 4 INB+ 5 INB- 6 OUTB 7 RF RG
MAX4284
14 OUTD OUTA 1 INA- 2 INA+ 3 VCC 4 INB+ 5 INB- 6 OUTB 7 N.C. 8
MAX4284
16 OUTD
-+ +-
-+
+-
13 IND12 IND+ 11 VEE 10 INC+ 9 8 INCOUTC
-+
+-
15 IND14 IND+ 13 VEE 12 INC+ 11 INC10 OUTC 9 N.C.
SO/TSSOP
QSOP
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-+
+-
-+
+-
MAX/SO
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Ordering Information (continued)
PART* MAX4274_EUA MAX4274_ESA MAX4275_EUA MAX4275_ESA MAX4281EUK-T MAX4281ESA MAX4282EUA MAX4282ESA MAX4284EUD MAX4284ESD MAX4284EEE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 8 MAX 8 SO 8 MAX 8 SO 5 SOT23-5 8 SO 8 MAX 8 SO 14 TSSOP 14 SO 16 QSOP TOP MARK -- -- -- -- ACDR -- -- -- -- -- --
Chip Information
TRANSISTOR COUNTS: MAX4174: 178 MAX4175: 178 MAX4274: 332 MAX4275: 332 MAX4281: 178 MAX4282: 332 MAX4284: 328 SUBSTRATE CONNECTED TO VEE
Note: Refer to Gain Selection Guide for SOT top marks. *Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number. Refer to Gain Selection Guide for a list of preferred gains.
Selector Guide
PART* MAX4174_ MAX4175_ MAX4274_ MAX4275_ MAX4281_ MAX4282_ MAX4284_ INVERTING GAINS AVAILABLE (V/V) (INVERTING, RF/RG) -0.25 to -100 -0.25 to -100 -0.25 to -100 -0.25 to -100 NONINVERTING GAIN (V/V) +1.25 to +101 +1.25 to +101 +1.25 to +101 +1.25 to +101 INTERNAL RESISTORS Yes Yes Yes Yes No No No INTERNAL VCC/2 BIAS No Yes No Yes No No No NO. OF AMPS PER PACKAGE 1 1 2 2 1 2 4 PIN-PACKAGE 5-pin SOT23 5-pin SOT23 8-pin MAX/SO 8-pin MAX/SO 5-pin SOT23, 8-pin SO 8-pin MAX/SO 14-pin SO/TSSOP, 16-pin QSOP
Open Loop, Unity-Gain Stable Open Loop, Unity-Gain Stable Open Loop, Unity-Gain Stable
* Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number.
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
Package Information
SOT5L.EPS
MAX4174/5, MAX4274/5, MAX4281/2/4
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SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4
Package Information
8LUMAXD.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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