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General Description

The MAX4174/MAX4175/MAX4274/MAX4275 Gain-

Amp™ family combines a low-cost Rail-to-Rail

op amp

with precision internal gain-setting resistors and V

/ 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 300µA.

GainAmp amplifiers are optimally compensated for

each gain version, achieving exceptional GBW prod-

ucts up to 23MHz (A

= +25V/V to +101V/V). High-volt-

age 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

/ 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 1kΩ load

while maintaining excellent DC accuracy. The amplifier

is stable for capacitive loads up to 470pF.

Applications

Portable Instruments Smart-Card Readers

Instruments, Terminals, Infrared Receivers for

and Bar-Code Readers Remote Controls

Keyless Entry Low-Side Current-Sense

Photodiode Preamps

Amplifiers

Features

♦ GainAmp Family Provides Internal Precision

Gain-Setting Resistors in SOT23 (MAX4174/5)

♦ 0.1% Gain Accuracy (R

) (MAX4174/5,

MAX4274/5)

♦ 54 Standard Gains Available (MAX4174/5,

MAX4274/5)

♦ Open-Loop Unity-Gain-Stable Op Amps

(MAX4281/2/4)

♦ Rail-to-Rail Outputs Drive 1kΩ Load

♦ Internal V

/ 2 Biasing (MAX4175/MAX4275)

♦ +2.5V to +5.5V Single Supply

♦ 300µA Supply Current

♦ Up to 23MHz GBW Product

♦ Fault-Protected Inputs Withstand ±17V

♦ Stable with Capacitive Loads Up to 470pF with

No Isolation Resistor

MAX4174/5, MAX4274/5, MAX4281/2/4

†

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

________________________________________________________________

Maxim Integrated Products

19-1407; Rev 3; 8/99

PART*

MAX4174_EUK-T

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5

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.

Ordering Information

GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

†

Patent pending

Pin Configurations

Typical Operating Circuit

MAX4175

INPUT

IN-

IN+

+5V

OUT

0.1µF

TOP VIEW

MAX4174

IN-

OUT

IN+

SOT23-5

Selector Guide appears at end of data sheet.

Pin Configurations continued at end of data sheet.

TOP

MARK

††

MAX4175_EUK-T

††

-40°C to +85°C 5 SOT23-5

Summary of content (20 pages)

PAGE 1
9-1407; Rev 3; 8/99 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 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 Features ♦ GainAmp Family Provides Internal Precision Gain-Setting Resistors in SOT23 (MAX4174/5) ♦ 0.
PAGE 2
MAX4174/5, MAX4274/5, MAX4281/2/4 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 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_).....................................
PAGE 3
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/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 PARAMETER SYMBOL Power-Up Time CONDITIONS MIN Output settling to 1% Slew Rate SR Settling Time to Within 0.01% TYP MAX UNITS 1 ms VCC = 5V, VOUT = 4V step 0.
PAGE 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 = +25°C.
PAGE 5
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/MAX4175 1 0 -1 AV = +50V/V -2 -3 0 -1 -2 -4 -4 -5 -5 -6 -6 100k 1M 10M -6 1k 10k 100k 1M 1k 10M 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY 0 -1 -2 -3 AV = +2.25V/V -4 1 0 -1 AV = +4V/V -2 3 2 NORMALIZED GAIN (dB) 1 AV = +2.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +5V, RL = 100kΩ to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25°C, unless otherwise noted.) MAX4174/MAX4175 TOTAL HARMONIC DISTORTION vs. FREQUENCY TOTAL HARMONIC DISTORTION vs. FREQUENCY VOUT = 1Vp-p -20 VOUT = 1Vp-p -20 -40 -60 THD (dB) -40 THD (dB) MAX4174 TOC14 0 MAX4174 TOC13 0 AV = +10V/V AV = +1.
PAGE 7
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/MAX4175 LARGE-SIGNAL PULSE RESPONSE INPUT VOLTAGE MAX4174/5 toc 21 MAX4174/5 toc 20 SMALL-SIGNAL PULSE RESPONSE INPUT VOLTAGE AV = +1.25V/V OUTPUT 50mV/div AV = +1.
PAGE 8
Typical Operating Characteristics (continued) (VCC = +5V, RL = 100kΩ to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25°C, unless otherwise noted.) MAX4174/MAX4175/MAX4281/MAX4282/MAX4284 POWER-SUPPLY REJECTION vs. FREQUENCY OUTPUT IMPEDANCE (Ω) -85 MAX4174 TOC24 4.9 4.8 10 4.7 VSWING (Vp-p) -80 5.0 MAX4174 TOC23 100 MAX4174 TOC22 -75 PSR (dB) OUTPUT VOLTAGE SWING vs. RLOAD OUTPUT IMPEDANCE vs. FREQUENCY -70 1 4.6 4.5 4.4 4.3 -90 0.1 -95 0.01 4.2 4.
PAGE 9
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4281/MAX4282/MAX4284 10 100 1k 10k 100k 1M 2 3 2 1 1 0 GAIN (dB) GAIN (dB) MAX4174/5 toc32 4 MAX4174/5 toc31 3 PHASE (degrees) 0 -45 -90 -135 -180 -225 -270 -315 10M LARGE-SIGNAL GAIN vs. FREQUENCY -1 -2 0 -1 -2 -3 -3 -4 -4 -5 -5 -6 -6 1k 10k 100k 1M 10M 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) COMMON-MODE REJECTION vs. FREQUENCY VOLTAGE NOISE DENSITY vs.
PAGE 10
MAX4174/5, MAX4274/5, MAX4281/2/4 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps Pin Description PIN MAX4281 5 SOT23 8 SO MAX4174/ MAX4175 MAX4282 MAX4274/ MAX4275 5 SOT23 8 SO/µMAX 8 SO/µMAX 14 SO/TSSOP 1 6 1 1, 7 1, 7 1, 7, 8, 14 2 4 2 4 4 11 3 3 3 3, 5 NAME FUNCTION 16 QSOP NAME FUNCTION 1, 7, 10, 16 OUT, OUTA, OUTB, OUTC, OUTD 13 VEE Negative Supply or Ground Noninverting Amplifier Input.
PAGE 11
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 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.
PAGE 12
MAX4174/5, MAX4274/5, MAX4281/2/4 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 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 5kΩ resistor at the noninverting input, and by RG at the inverting input.
PAGE 13
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps VCC MAX4175 RB VCC 0.1µF VOUT = RB VCC - VIN 2 ( RRFG ) VIN RG RF VOUT = -RF (VIN) RG VIN RG Figure 4. Single-Supply, DC-Coupled Inverting Amplifier with Negative Input Voltage RF Figure 6. Single-Supply, AC-Coupled Inverting Amplifier MAX4174 VCC VCC MAX4174 VIN VOUT = - VIN R VOUT = VIN 1+ F RG ( ( RRFG ) ) VEE VEE RF VIN RG RF Figure 5.
PAGE 14
MAX4174/5, MAX4274/5, MAX4281/2/4 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 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 0.1µF 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.
PAGE 15
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 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 MAX4174/5, MAX4274/5, MAX4281/2/4 INPUT AV = +25V/V OUTPUT 50mV/div AV = +25V/V OUTPUT 50mV/div AV = +51V/V OUTPUT 50mV/div AV = +51V/V OUTPUT 50mV/div 2µs/div Figure 11.
PAGE 16
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps MAX4174/5, MAX4274/5, MAX4281/2/4 Gain Selection Guide GAIN CODE RF/RG INVERTING GAIN 1+ (RF/RG) NONINVERTING GAIN -3dB BW (kHz)† MAX4174 AB* 0.25 1.25 1700 ACDS ACET AC 0.5 1.5 1280 ACDT ACEU TOP MARK MAX4175 AD* 1 2 590 ACDU ACEV AE 1.25 2.25 450 ACDV ACEW AF 1.5 2.5 1180 ACDW ACEX ACEY AG* 2 3 970 ACDX AH 2.5 3.
PAGE 17
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps TOP VIEW MAX4175 MAX4281 OUT 1 5 VCC OUT 1 + VEE 2 VEE 2 + - RG R R IN+ 3 5 VCC RF VCC 4 IN+ 3 SOT23-5 4 IN- SOT23-5 MAX4281 MAX4282 N.C. 1 8 N.C. OUTA 1 MAX4274 8 VCC OUTA 1 8 VCC 7 OUTB 6 INB- 5 INB+ RF - + IN- 2 7 VCC - + INA- 2 7 OUTB INA- 2 - + + - + - IN+ 3 6 OUT INA+ 3 6 INB- INA+ 3 VEE 4 5 N.C.
PAGE 18
MAX4174/5, MAX4274/5, MAX4281/2/4 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps Chip Information Ordering Information (continued) PART* TEMP.
PAGE 19
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps SOT5L.
PAGE 20
SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps 8LUMAXD.EPS MAX4174/5, MAX4274/5, MAX4281/2/4 Package Information 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.