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19-1526; Rev 1; 10/99
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
General Description
The MAX4074-MAX4078 GainAmpTM op amp family combines low-cost Rail-to-Rail(R) op amps with precision internal gain-setting resistors. 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 just 34A. GainAmp amplifiers are optimally compensated for each gain version, achieving gain bandwidth (GBW) products up to 4MHz (AV = +25V/V to +101V/V). High-voltage fault protection withstands 17V at either input without damage or excessive current draw (MAX4074/MAX4075 only). Two versions are available in this amplifier family. The MAX4076/MAX4077/MAX4078 are single/dual/quad open-loop, unity-gain-stable op amps, and the MAX4074/MAX4075 are single/dual fixed-gain op amps. 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 GainAmp outputs can swing rail-to-rail and drive a 1k load while maintaining excellent DC accuracy (MAX4074/MAX4075 only). The amplifiers are stable for capacitive loads up to 100pF. For space-critical applications, the MAX4074/MAX4076 are available in space-saving SOT23-5 packages.
Features
o Internal Gain-Setting Resistors in SOT23 Packages (MAX4074) o 0.1% Gain Accuracy (RF/RG) (MAX4074/75) o 54 Standard Gains Available (MAX4074/75) o Open-Loop, Unity-Gain-Stable Op Amps (MAX4076/77/78) o Rail-to-Rail Outputs Drive 1k Load (MAX4074/75) o +2.5V to +5.5V Single Supply o 34A Supply Current (MAX4074/75) o Up to 4MHz GBW Product o Fault-Protected Inputs Withstand 17V (MAX4074/75) o 200pA max Input Bias Current (MAX4076/77/78) o Stable with Capacitive Loads up to 100pF with No Isolation Resistor
MAX4074-MAX4078
Ordering Information
PART MAX4074__EUK-T MAX4074__ESA TEMP. RANGE -40C to +70C -40C to +70C PINPACKAGE 5 SOT23-5 8 SO TOP MARK ** --
Applications
Portable Battery-Powered Equipment Instruments, Terminals, and Bar-Code Readers Keyless Entry Photodiode Preamps Smart-Card Readers Infrared Receivers for Remote Controls Low-Side Current-Sense Amplifiers
Ordering Information continued at end of data sheet. Note: Insert the desired gain code in the blank to complete the part number (see the Gain Selector Guide). **See the Gain Selector Guide for a list of preferred gains and top marks.
Pin Configurations/ Functional Diagrams
TOP VIEW MAX4074
OUT 1 RF VEE 2 5 VCC
Gain Selector Guide appears at end of data sheet. Typical Operating Circuit appears at end of data sheet.
IN+ 3
RG 4 IN-
Patent pending.
GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
SOT23-5
Pin Configurations continued at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
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.
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
ABSOLUTE MAXIMUM RATINGS
Supply Voltages (VCC to VEE) ..................................-0.3V to +6V Voltage Inputs (IN_) MAX4076/MAX4077/MAX4078 .....(VCC + 0.3V) to (VEE - 0.3V) MAX4074/MAX4075..........................................................17V Output Short-Circuit Duration to Either Supply (OUT_). . . . Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C) ............571mW 14-Pin TSSOP (derate 6.3mW/C above +70C) ..........500mW 8-Pin MAX (derate 4.1mW/C above +70C) ..............330mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW 14-Pin SO (derate 8.33mW/C above +70C)...............667mW Operating Temperature Range ...........................-40C to +85C 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--MAX4074/MAX4075
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, 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 (Note 2) Inverting Input Resistance Noninverting Input Resistance Positive Input Voltage Range Negative Input Voltage Range Power-Supply Rejection Ratio Closed-Loop Output Impedance Output Short-Circuit Current IIN+_ RIN_ RIN_+ IN_+ IN_PSRR ROUT Shorted to VCC Shorted to VEE RL = 1M Output Voltage Swing (Note 4) RL = 10k RL = 1k VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE Guaranteed by functional test (Note 3) Guaranteed by functional test (Note 3) VCC = 2.5V to 5.5V 70 VEE 0.15 15 96 0.2 5 -22 0.5 0.4 25 11 300 100 2.5 2.5 150 80 1000 600 mV AV < +25V/V AV +25V/V SYMBOL VCC ICC VOS VCC = 5V VCC = 3V RL = 1M CONDITIONS Guaranteed by PSRR test MIN 2.5 37 34 0.2 0.3 0.8 300 80 1000 VCC 1.2 1000 TYP MAX 5.5 55 50 3.5 UNITS V A mV V/C pA k M V V dB mA
2
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Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS--MAX4074/MAX4075 (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1) PARAMETER Power-Up Time Slew Rate Settling Time (to 0.01%) Input Voltage Noise Density Input Noise Current Density Capacitive Load Stability DC Gain Accuracy CLOAD en SR SYMBOL VOUT = 4V step VOUT = 4V step f = 5kHz (Note 5) f = 5kHz No sustained oscillations (VEE + 25mV) < VOUT < (VCC - 25mV), RL = 1M (Note 6) AV = +1.25V/V AV = +3V/V -3dB Bandwidth BW (-3dB) AV = +5V/V AV = +10V/V AV = +25V/V TA = +25C TA = TMIN to TMAX 200 90 80 90 120 kHz CONDITIONS Output settling to 1% MIN TYP 9 100 60 150 500 500 0.01 1.0 % 1.2 MAX UNITS ms V/ms s nV/Hz fA/Hz pF
MAX4074-MAX4078
ELECTRICAL CHARACTERISTICS--MAX4076/MAX4077/MAX4078
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, 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 (Note 2) Input Offset Current Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Closed-Loop Output Impedance Output Short-Circuit Current IIBIAS IOS IVR CMRR PSRR ROUT Guaranteed by CMRR (VCC - 1.2V) VCM -0.15V VCC = 2.5V to 5.5V AV = +1V/V Shorted to VCC Shorted to VEE 0.05V < VOUT < (VCC - 0.1V), RL = 1M Large-Signal Voltage Gain AVOL 0.25V < VOUT < (VCC - 0.3V), RL = 10k 0.25V < VOUT < (VCC - 0.3V), RL = 5k 80 80 80 0.15 70 70 95 95 0.2 4.5 20 117 95 93 dB SYMBOL VCC ICC VOS VCC = 5V VCC = 3V RL = 1M CONDITIONS Guaranteed by PSRR test MIN 2.5 45 40 1.2 1.5V 1 0.4 VCC 1.2 200 TYP MAX 5.5 60 55 3.5mV UNITS V A mV V/C pA pA V dB dB mA
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3
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
ELECTRICAL CHARACTERISTICS--MAX4076/MAX4077/MAX4078 (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC/2, RL = to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1) PARAMETER SYMBOL RL = 1M Output Voltage Swing VOH/VOL RL = 10k RL = 5k Gain-Bandwidth Product Slew Rate Settling Time (to 0.01%) Input Voltage Noise Density Input Noise Current Density Capacitive Load Stability Power-Up Time CLOAD en GBW SR VOUT = 4V step VOUT = 4V step f = 5kHz f = 5kHz No sustained oscillations, AV = +1V/V Output settling to 1% CONDITIONS VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE MIN TYP 0.23 0.22 12 7 100 100 230 90 69 110 1.1 100 10 MAX 2.5 2.5 50 50 100 100 kHz V/ms s nV/Hz fA/Hz pF ms mV UNITS
Note 1: All devices 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 GainAmps. Note 4: For AV = -0.5V/V and AV = -0.25V/V, the output voltage swing may be limited by the input voltage range. Note 5: Includes noise from on-chip resistors. Note 6: The gain accuracy test is performed with the GainAmps in the 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 = +5.0V, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
MAX4074/MAX4075
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 tocc1-2
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 tocc3-4
SMALL-SIGNAL GAIN vs. FREQUENCY
3 2 1 GAIN (dB) VOUT = 100mVp-p
MAX4074-8 tocc5-6
4 3 2 1 GAIN (dB) VOUT = 100mVp-p
4 3 2 1 GAIN (dB) VOUT = 100mVp-p
4
0 -1 -2 -3 -4 -5 -6 1k 10k AV = +2.25V/V
AV = +1.25V/V
0 -1 -2 -3 -4 -5 -6 AV = +4V/V
AV = +2.5V/V
0 -1 -2 -3 -4 -5 -6 AV = +9V/V AV = +5V/V
100k
1M
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
4
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Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
Typical Operating Characteristics
(VCC = +5.0V, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
MAX4074-MAX4078
MAX4074/MAX4075
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc04
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc05
SMALL-SIGNAL GAIN vs. FREQUENCY
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 AV = +101V/V AV = +51V/V VOUT = 100mVp-p
MAX4074-8 toc06
4 3 2 1 GAIN (dB) AV = +10V/V AV = +21V/V VOUT = 100mVp-p
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 AV = +50V/V AV = +25V/V VOUT = 100mVp-p
4
0 -1 -2 -3 -4 -5 -6 1k 10k 100k 1M FREQUENCY (Hz)
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc07
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc08
LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 1 VOUT = 1Vp-p
MAX4074-8 toc09
4 3 2 1 GAIN (dB) VOUT = 1Vp-p
4 3 2 1 GAIN (dB) VOUT = 1Vp-p
4
AV = +1.25V/V AV = +2.25V/V
-1 -2 -3 -4 -5 -6 1k 10k 100k 1M FREQUENCY (Hz)
-1 -2 -3 -4 -5 -6 1k
AV = +2.5V/V AV = +4V/V
GAIN (dB)
0
0
0 -1 -2 -3 -4 -5 -6 AV = +9V/V AV = +5V/V
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc10
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4074-8 toc11
LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 1 VOUT = 1Vp-p
MAX4074-8 toc12
4 3 2 1 GAIN (dB) VOUT = 1Vp-p
4 3 2 1 GAIN (dB) VOUT = 1Vp-p
4
-1 -2 -3 -4 -5 -6 1k 10k AV = +21V/V
AV = +10V/V
-1 -2 -3 -4 -5 -6 AV = +50V/V
AV = +25V/V
GAIN (dB)
0
0
0 -1 -2 -3 -4 -5 -6 AV = +101V/V AV = +51V/V
100k
1M
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
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5
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
Typical Operating Characteristics (continued)
(VCC = +5.0V, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
MAX4074/MAX4075
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4074-8 toc25
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4074-8 toc26
TOTAL HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING
f = 10kHz -30 -40 THD (dB) -50 -60 -70 AV = +1.25V/V AV = +3V/V AV = +10V/V
MAX4074-8 toc27
0 -10 -20 -30 THD (dB) -40 -50 -60 -70 -80 -90 -100 100 1k 10k AV = +1.25V/V AV = +10V/V AV = +3V/V VOUT = 1Vp-p
0 -10 -20 -30 THD (dB) -40 -50 -60 -70 -80 -90 -100 AV = +51V/V AV = +25V/V VOUT = 1Vp-p
-20
-80 -90
100k
100
1k
10k
100k
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)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING
f = 10kHz -30 -40 THD (dB) -50 -60 AV = +25V/V -70 -80 -90 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) 10 1 10 AV = +51V/V
MAX4074-8 toc28
VOLTAGE NOISE DENSITY vs. FREQUENCY
MAX4074-8 toc29
-20
1000
VOLTAGE NOISE (nV/Hz)
AV = +3V/V AV = +10V/V 100 AV = +1.25V/V
100
1k
10k 100k
1M
10M
FREQUENCY (Hz)
VOLTAGE NOISE DENSITY vs. FREQUENCY
MAX4074-8 toc30
CURRENT NOISE DENSITY vs. FREQUENCY
MAX4074 TOC31
1000
10
100 AV = +51V/V
CURRENT NOISE DENSITY (fA/Hz)
AV = +25V/V VOLTAGE NOISE (nV/Hz)
1
10 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
6
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Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(VCC = +5.0V, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
MAX4074-MAX4078
MAX4074/MAX4075
SMALL-SIGNAL PULSE RESPONSE
MAX4074 TOC36
LARGE-SIGNAL PULSE RESPONSE
MAX4074 TOC35
INPUT
INPUT
OUTPUT 50mV/div AV = +1.25V/V
OUTPUT 500mV/div AV = +1.25V/V
OUTPUT 50mV/div AV = +3V/V
OUTPUT 500mV/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
10s/div
10s/div
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7
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
Typical Operating Characteristics (continued)
(VCC = +5.0V, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION vs. FREQUENCY
MAX4074 TOC32
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4074TOC33
-10 -20 -30 PSR (dB) -40 -50 -60 -70 -80 -90 -100 100 1k 10k
250 OUTPUT SWING (mV) 200 150 100 50
OUTPUT IMPEDANCE ()
100
10
1
VCC - VOH VOL - VEE
0.1 100k 100 1k 10k FREQUENCY (Hz) 100k 1M FREQUENCY (Hz)
0 1 10 RLOAD (k) 100
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4074/5-toc35
INPUT BIAS CURRENT vs. TEMPERATURE
VCC - VEE = 5.5V 500 INPUT BIAS CURRENT (pA) 400 300 200 VCC - VEE = 5.5V 100 0 MAX4076/77/78 -100 -200 VCC - VEE = 2.5V MAX4074/4075 VCC - VEE = 2.5V
MAX4074/5-toc36
100 75 INPUT OFFSET VOLTAGE (V) 50 25 0 -25 -50 -75 -100 -50 -35 -20 -5 10 25 40 55 70 VCC - VEE = 2.5V VCC - VEE = 5.5V
600
85
-45 -30 -15
0
15
30
45
60
75
90
TEMPERATURE (C)
TEMPERATURE (C)
VOH AND VOL vs. TEMPERATURE (VCC - VEE = 2.5V)
MAX4074/5-toc37
VOH AND VOL vs. TEMPERATURE (VCC - VEE = 5.5V)
MAX4074/5-toc38
SUPPLY CURRENT vs. TEMPERATURE
MAX4074/5-toc39
175 150 125 100 VOLTAGE (mV) 75 50 25 0 -25 -50 -75 -100 -50 -35 -20 -5 10 25 40 55 70 85 TEMPERATURE (C) VOL, RL = 1k VOL, RL = 10k VOL, RL = 100k VOH, RL = 10k VOH, RL = 100k VOH, RL = 1k
450 400 350 300 VOLTAGE (mV) 250 200 150 100 50 0 -50 -100 -150 VOH, RL = 10k VOL, RL = 10k VOL, RL = 1k -50 -35 -20 -5 10 25 40 55 70 VOH, RL = 100k VOH, RL = 1k
40.0 VCC - VEE = 5.5V SUPPLY CURRENT (A) 37.5 VCC - VEE = 4.0V 35.0 VCC - VEE = 3.0V
32.5 VOL, RL = 100k 30.0 85 -50 -35 -20 -5
VCC - VEE = 2.5V
10
25
40
55
70
85
TEMPERATURE (C)
TEMPERATURE (C)
8
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MAX4074 TOC34
0
OUTPUT VOLTAGE SWING vs. RLOAD
300
1k
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(VCC = +5.0V, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
MAX4074-MAX4078
MAX4076/MAX4077/MAX4078
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4076/7/8 toc1
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4076- 8 toc2
VOLTAGE NOISE vs. FREQUENCY
MAX4076-8 toc3
4 3 2 1 GAIN (dB)
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6
1k
0 -1 -2 -3 -4 -5 -6 1k 10k 100k FREQUENCY (Hz) 1M 10M
VOLTAGE NOISE (nV/Hz)
100
10 1k 10k 100k FREQUENCY (Hz) 1M 10M 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
CURRENT NOISE vs. FREQUENCY
MAX4076-8 toc4
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4076-8 toc5
MAX4077 CROSSTALK vs. FREQUENCY
-85 -90 CROSSTALK (dB) -95 -100 -105 -110 -115
MAX4076-8 toc6
100
-40
-80
AV = +1V/V
-50
CURRENT NOISE (pA/Hz)
10 THD (dB) 1
-60
-70
-80
-120 -125
0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-90 100 1k 10k 100k FREQUENCY (Hz)
-130 1k 10k 100k 1M FREQUENCY (Hz)
MAX4078 ALL HOSTILE CROSSTALK vs. FREQUENCY
MAX4076-8 toc7
GAIN AND PHASE vs. FREQUENCY
120 80 40 0 GAIN (dB) -40 -80 PHASE GAIN
MAX4076-8 toc8
COMMON-MODE REJECTION vs. FREQUENCY
180 90 PHASE (degrees) 0 -90 -180 -270 -360 -450 10M -20 -30 -40 CMR (dB) -50 -60 -70 -80 -90 -100 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
MAX4076-8 toc9
-60 -65 -70 CROSSTALK (dB) -75 -80 -85 -90 -95 -100 -105 -110
THREE AMPLIFIERS DRIVEN, ONE OUTPUT MEASURED.
270
-10
-120 -160 -200 1k 10k 100k 1M 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz)
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9
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
Pin Description
PIN MAX4074/MAX4076 SOT23 1 2 3 4 5 -- SO 6 4 3 2 7 1, 5, 8 MAX4075 MAX4077 MAX/SO 1, 7 4 3, 5 2, 6 8 -- MAX4078 SO/TSSOP 1, 7, 8, 14 11 3, 5, 10, 12 2, 6, 9, 13 4 -- OUT_ VEE IN_+ IN_VCC N.C. Amplifier Output Negative Supply or Ground Noninverting Amplifier Input Inverting Amplifier Input Positive Supply No Connection. Not internally connected. NAME FUNCTION
_______________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. There are two versions in this amplifier family: single/dual/quad open-loop, unity-gain-stable devices (MAX4076/MAX4077/MAX4078), and single/dual fixedgain devices (MAX4074/MAX4075). All amplifiers feature rail-to-rail outputs and drive a 10k load while maintaining excellent DC accuracy.
VCC AV = RF -RF RG RF RG
RG IN-
AV = 1 +
VEE OUT IN+
Open-Loop Op Amps
The single/dual/quad MAX4076/MAX4077/MAX4078 are low-power, open-loop op amps with rail-to-rail outputs. These devices are compensated for unity-gain stability and feature a GBW product of 230kHz. The commonmode range 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 fixed-gain amplifier in higher gain configurations, these open-loop op amps can be used to prototype designs.
Figure 1. Internal Gain-Setting Resistors
Internal Gain-Setting Resistors
Maxim's proprietary laser trimming techniques allow RF/RG values (Figure 1) that produce many different gain configurations. 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 plug directly into existing board designs, easily replacing op amps-plus-resistor gain blocks.
10
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Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
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 = +25V/V has a -3dB bandwidth of 120kHz. By comparison, a unity-gain-stable op amp configured for AV = +25V/V would yield a -3dB bandwidth of only 8kHz. Decompensation is performed at five intermediate gain sets, as shown in the Gain Selector Guide. 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 causes less than 3.5mA to flow through the input pin, protecting both the GainAmp and the signal source from damage.
MAX4074-MAX4078
Applications Information
GainAmp fixed-gain amplifiers offer a precision, fixedgain 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 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.
High-Voltage (17V) Input Fault Protection
The MAX4074/MAX4075 family includes 17V input fault protection. For normal operation, see the input voltage range specification in the Electrical Characteristics. Overdriven inputs up to 17V will not 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 2). Additionally, the internal op amp inputs are diode clamped to both supply rails for
GainAmp Input Voltage Range
The MAX4074/MAX4075 combine both an op amp and gain-setting feedback resistors on the same IC. The inverting input voltage range is different from the noninverting input voltage range because the inverting input pin is connected to the RG input series resistor. Just as with a discrete design, take care not to saturate the inputs/output of the core op amp to avoid signal distortions or clipping.
RF
IN17V SCR
RG
OUT VEE VCC 5k
IN+ 17V SCR
VEE
MAX4074 MAX4075
VEE NOTE: INPUT STAGE PROTECTION INCLUDES TWO 17V SCRs AND TWO DIODES AT THE INPUT STAGE.
Figure 2. Input Protection ______________________________________________________________________________________ 11
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
GainAmp Signal Coupling and Configurations
Common op amp configurations include both noninverting and inverting amplifiers. Figures 3-6 show various single- and dual-supply circuit configurations. In singlesupply systems, use a resistor-divider to bias the noninverting input. A lowpass filter capacitor from the op amp input to ground (Figure 5) prevents high-frequency power-supply noise from coupling into the op amp input. Dual-supply systems can have ground-referenced signals DC-coupled into the inverting or noninverting inputs.
MAX4074
VCC VOUT = - VIN
( RRFG )
VEE VIN RG RF
Supply Bypassing and Board Layout
All devices in this 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.
Figure 4. Dual-Supply, DC-Coupled Inverting Amplifier
VCC
MAX4074
VCC
Capacitive-Load Stability
Driving large capacitive loads can cause instability in most low-power, rail-to-rail output amplifiers. The fixedgain amplifiers of this GainAmp family are stable with capacitive loads up to 100pF. Stability with higher capacitive loads can be improved by adding an isolation resistor in series with the op amp output, as shown in Figure 7. This resistor improves the circuit's phase margin by isolating the load capacitor from the amplifier's output. In Figure 8, a 220pF capacitor is driven with a 100 isolation resistor exhibiting some overshoot but no oscillation. Figures 9 and 10 show the typical smallsignal pulse responses of GainAmp fixed-gain amplifiers with 47pF and 100pF capacitive loads and no isolation resistor
0.1F
VOUT =
VCC - VIN 2
( RFG ) R
VIN RG RF
Figure 5. Single-Supply, AC-Coupled Inverting Amplifier
MAX4074
VCC VCC VIN
MAX4074
VEE VCC RF VIN RG RF VOUT = -RF (VIN) RG RG
R VOUT = VIN 1+ F RG
(
)
Figure 3. Single-Supply, DC-Coupled Inverting Amplifier with Negative Input Voltage 12
Figure 6. Dual-Supply, DC-Coupled Noninverting Amplifier
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Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
MAX4074
RG RF AV = +5V/V 50mV/div RISO INPUT VEE CL OUTPUT RL AV = +5V/V 500mV/div
INPUT
OUTPUT
VCC
OUTPUT
Figure 7. Dual-Supply, Capacitive-Load-Driving Circuit
Figure 8. Small-Signal/Large-Signal Transient Response with Excessive Capacitive Load and Isolation Resistor
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13
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
INPUT
INPUT
OUTPUT 50mV/div 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
10s/div
10s/div
Figure 9. GainAmp Small-Signal Pulse Response (CL = 340pF, RL = 100k)
Figure 10. GainAmp Small-Signal Pulse Response (CL = 940pF, RL = 100k)
14
______________________________________________________________________________________
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
Gain Selector 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 INVERTING GAIN (V/V) 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 79 99 100 NONINVERTING GAIN (V/V) 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 80 100 101 -3dB BW (kHz) 200 136 102 70 180 135 116 90 80 71 61 50 90 79 64 54 40 120 106 89 67 50 82 66 50 40 38 TOP MARK ADJB ADJC ADJD ADJE ADJF ADJG ADJH ADJI ADJJ ADJK ADJL ADJM ADJN ADJO ADJP ADJQ ADJR ADJS ADJT ADJU ADJV ADJW ADJX ADJY ADJZ ADKA ADKB
MAX4074-MAX4078
Note: Bold indicates preferred gains. These gain versions are available as samples and in small quantities.
______________________________________________________________________________________
15
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
Pin Configurations/Functional Diagrams
TOP VIEW MAX4074
N.C. 1 8 N.C. OUT 1
MAX4076
5 VCC N.C. 1
MAX4076
8 N.C.
+
IN+ 3 6 OUT
IN+ 3
4
IN-
IN+ 3
SOT23-5
VEE 4 5 N.C. VEE 4 5 N.C.
SO MAX4075
OUTA 1 RF 8 VCC OUTA 1
MAX4077
8 VCC OUTA 1 INA- 2 OUTB INA+ 3 6 INBVCC 4 INB+ 5 INB- 6 OUTB 7
MAX4078
14 OUTD
+
7 OUTB INA- 2
+
7
-
-
+
-
INA- 2
RG
+
INA+ 3
RF
+
6 INBINA+ 3
-
-
RG
VEE 4
5
INB+
VEE 4
5
INB+
SO/TSSOP
16
______________________________________________________________________________________
+
+
MAX/SO
MAX/SO
+
SO
-
IN- 2
7 VCC
VEE 2
+
IN- 2
7 VCC
6 OUT
+
13 IND12 IND+ 11 VEE 10 INC+ 9 INC8 OUTC
-
-
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
Ordering Information (continued)
PART MAX4075__EUA MAX4075__ESA MAX4076EUK-T MAX4076ESA MAX4077EUA MAX4077ESA MAX4078EUD MAX4078ESD TEMP. RANGE -40C to +70C -40C to +70C -40C to +70C -40C to +70C -40C to +70C -40C to +70C -40C to +70C -40C to +70C PINPACKAGE 8 MAX 8 SO 5 SOT23-5 8 SO 8 MAX 8 SO 14 TSSOP 14 SO TOP MARK -- -- ** -- -- -- -- --
___________________Chip Information
TRANSISTOR COUNTS MAX4074: 180 MAX4077: 340 MAX4075: 360 MAX4078: 332 MAX4076: 180
MAX4074-MAX4078
Typical Operating Circuit
+5V VCC VCC VCC 0.1F
Note: Insert the desired gain code in the blank to complete the part number (see the Gain Selector Guide). **See the Gain Selector Guide for a list of preferred gains and top marks.
IN+ 0.1F
MAX4074
OUT
INPUT 0.1F
INRG VEE RF
______________________________________________________________________________________
17
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
Package Information
SOT5L.EPS
18
______________________________________________________________________________________
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
Package Information (continued)
TSSOP.EPS
MAX4074-MAX4078
______________________________________________________________________________________
19
Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps MAX4074-MAX4078
Package Information (continued)
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.
SOICN.EPS

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