Datasheet MAX4275BEESA, MAX4275BDEUA, MAX4275BDESA, MAX4275BCEUA, MAX4275BCESA Datasheet (Maxim)

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General Description

The MAX4174/MAX4175/MAX4274/MAX4275 Gain­Amp™ family combines a low-cost Rail-to-Rail®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 300µA.
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
VCC/ 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

F/RG

) (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

CC

/ 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

1

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

R

B

R

B

OUT

V

CC

V

CC

V

EE

V

EE

R

G

0.1µF

R

F

0.1µF

0.1µF

TOP VIEW

MAX4174

5

4

1

2

3

IN-

OUT

V

CC

V

EE

R

G

R

F

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

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers

(VCC= +2.5V to +5.5V, VEE= 0, V

IN+

= V

IN-

= VCC/ 2, RLto VCC/ 2, RL= open, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

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.

Supply Voltage (VCCto VEE) ....................................-0.3V to +6V

Voltage Inputs (IN_)

MAX4281/4282/4284.....................(V

EE

- 0.3V) to (VCC+ 0.3V)

MAX4174/4175/4274/4275 (with respect to GND) ...........±17V

Output Short-Circuit Duration

(OUT_).....................................Continuous to Either V

EE

or V

CC

Continuous Power Dissipation (TA= +70°C)

5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW

8-Pin SO (derate 5.88mW/°C above +70°C).................471mW

8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW

14-Pin SO (derate 8.3mW/°C above +70°C)...............667mW

16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW

Operating Temperature Range ...........................-40°C to +85°C

Maximum Junction Temperature .....................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

RL= 1kΩ

RL= 100kΩ

MAX4174/MAX4274

Shorted to V

CC

Shorted to V

EE

Guaranteed by PSRR tests

VCC= 2.5V to 5.5V

IN_+, MAX4174/MAX4274 (Note 2)

MAX4175/MAX4275

MAX4175/MAX4275,
includes V

CC

/ 2 bias resistors

MAX4174/MAX4274

RL= 100kΩ

CONDITIONS

mV

60 150

Output Voltage Swing
(Note 4)

150 250

28

28

VOH/V

OL

mA

65

Short-Circuit Current

10

Ω0.02R

OUT

Closed-Loop Output
Impedance

dB70 90PSRR

Power-Supply Rejection
Ratio

kΩ75

Noninverting Input
Resistance

MΩ1000

330 510

300 460

V2.5 5.5V

CC

Supply Voltage Range

150

nA±0.05 ±10I

BIAS

Input Bias Current

µV/°CInput Offset Voltage Drift ±5

320 480

µA

355 530

I

CC

Supply Current
(per Amplifier)

±0.5 ±2.5

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC= 3V
VCC= 5V
VCC= 3V
VCC= 5V

mVV

OS

Input Offset Voltage

AV< 25V/V

kΩ

40

Inverting Input Resistance

AV> 25V/V

VCC- V

OH

VOL- V

EE

VCC- V

OH

VOL- V

EE

MAX4175/MAX4275, VIN+ = VIN- V

V

CC

/ 2 VCC/ 2

- 0.25 + 0.25

IN_+ Bias Voltage

Guaranteed by functional test (Note 3) VV

EE

VCC- 1.2IN_+ Input Voltage Range

Guaranteed by functional test VV

EE

V

CC

IN_- Input Voltage Range

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers (continued)

(VCC= +2.5V to +5.5V, VEE= 0, V

IN+

= V

IN-

= VCC/ 2, RLto VCC/ 2, RL= open, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

Gain = +5V/V

Gain = +3V/V

Gain = +1.25V/V

No sustained oscillations

f = 10kHz (Note 5)

Output settling to 1%

CONDITIONS

970

970

1700

pF470C

LOAD

Capacitive Load Stability

nV/√Hz

90e

n

Input Noise Voltage Density

ms1Power-Up Time

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC= 5V, V

OUT

= 4V step V/µs0.7SRSlew Rate

Gain = +51V/V

Gain = +25V/V

Gain = +10V/V

kHz

330

BW

-3dB

-3dB Bandwidth

590

640

f = 10kHz

fA/√Hz

4i

n

Input Noise Current Density

VCC= 5V, V

OUT

= 4V step µs7

Settling Time to Within

0.01%

(V

EE

+ 25mV) < V

OUT

< (VCC- 25mV),

R

L

= 100kΩ (Note 6)

%0.1 0.5DC Gain Accuracy

ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps

(VCC= +2.5V to +5.5V, VEE= 0, V

IN+

= V

IN-

= VCC/ 2, RLto VCC/ 2, RL= open, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

Guaranteed by CMRR test VV

EE

- 0.15 VCC- 1.2

Guaranteed by PSRR tests

CMVR

Common-Mode Input
Voltage Range

Differential or common mode

CONDITIONS

R

IN

Input Resistance MΩ1000

V2.5 5.5V

CC

Supply Voltage Range

±10 ±1000

nA±0.05 ±10I

BIAS

Input Bias Current

µV/°CInput Offset Voltage Drift ±5

UNITSMIN TYP MAXSYMBOLPARAMETER

pAI

OS

Input Offset Current

V

CC

= 3V µA

290 450

I

CC

Supply Current
(per Amplifier)

RL= 100kΩ

mV±0.5 ±2V

OS

Input Offset Voltage

V

CC

= 5V µA320 500

C

IN

Input Capacitance pF2.5

VEE- 0.15V ≤ VCM≤ VCC- 1.2V dB60 90CMRR

Common-Mode Rejection
Ratio

VCC= 2.5V to 5.5V dB70 90PSRR

Power-Supply Rejection
Ratio

AV= 1V/V Ω0.02R

OUT

Closed-Loop Output
Impedance

Typical Operating Characteristics

(VCC= +5V, RL = 100kΩ to VCC/ 2, small-signal V

OUT

= 100mVp-p, large-signal V

OUT

= 1Vp-p, TA= +25°C, unless otherwise noted.)

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

4 _______________________________________________________________________________________

Note 1: MAX4174/MAX4175/MAX4281 and MAX4274/MAX4275/MAX4282 and MAX4284 are 100% production tested at

T

A

= +25°C. 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.

4

-6
1k 100k 1M10k 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC01

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +2.25V/V

AV = +1.25V/V

4

-6
1k 100k 1M10k 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC02

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +4V/V

AV = +2.5V/V

4

-6
1k 100k 1M10k 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC03

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +9V/V

AV = +5V/V

Shorted to V

EE

MHz2

No sustained oscillations, AV= 1V/V

f = 10kHz

VCC= 5V, V

OUT

= 4V step

GBW

RL= 100kΩ

VCC= 5V, V

OUT

= 4V step

µs

VEE+ 0.05V < V

OUT

< V

CC

- 0.1V, RL= 100kΩ

mA

Gain Bandwidth Product

V/µs

RL= 1kΩ

10

CONDITIONS

0.7
7

SRSlew Rate

Settling Time to within 0.01%

Short-Circuit Current

pF470C

LOAD

Capacitive Load Stability

nV/√Hz

60e

n

Input Noise Voltage Density

Shorted to V

CC

mA65

VEE+ 0.25V < V

OUT

< V

CC

- 0.3V, RL= 1kΩ

160 250

dB

60 100

80 100

28

mV

28

VOH/V

OL

Output Voltage Swing

dB

A

VOL

Large-Signal Voltage Gain

90 120

UNITSMIN TYP MAXSYMBOLPARAMETER

ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(continued)

(VCC= +2.5V to +5.5V, VEE= 0, V

IN+

= V

IN-

= VCC/ 2, RLto VCC/ 2, RL= open, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

VCC- V

OH

VOL- V

EE

VCC- V

OH

VOL- V

EE

f = 10kHz

fA/√Hz

1.8i

n

Input Noise Current Density

Output settling to 1% ms1Power-Up Time

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

_______________________________________________________________________________________

5

Typical Operating Characteristics (continued)

(VCC= +5V, RL = 100kΩ to VCC/ 2, small-signal V

OUT

= 100mVp-p, large-signal V

OUT

= 1Vp-p, TA= +25°C, unless otherwise noted.)

4

-6
1k 100k 1M10k 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC04

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +21V/V

AV = +10V/V

4

-6
1k 100k 1M10k 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC05

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +50V/V

AV = +25V/V

4

-6
1k 100k 1M10k 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC06

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +100V/V

AV = +51V/V

4

-6
1k 100k 1M10k 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC07

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +2.25V/V

AV = +1.25V/V

4

-6
1k 100k 1M10k 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC08

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +4V/V

AV = +2.5V/V

4

-6
1k 100k 1M10k 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC09

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +9V/V

AV = +5V/V

MAX4174/MAX4175

4

-6
1k 100k 1M10k 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC10

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +21V/V

AV = +10V/V

4

-6
1k 100k 1M10k 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC11

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +50V/V

AV = +25V/V

4

-6
1k 100k 1M10k 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4174 TOC12

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

-5

-4

-3

-2

-1

0

1

2

3

AV = +100V/V

AV = +51V/V

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

6 _______________________________________________________________________________________

1k 10k 100k 1M

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

MAX4174 TOC13

FREQUENCY (Hz)

THD (dB)

0

-120

-100

-80

-60

-40

-20

AV = +3V/V

AV = +10V/V

V

OUT

= 1Vp-p

AV = +1.25V/V

1k 10k 100k 1M

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

MAX4174 TOC14

FREQUENCY (Hz)

THD (dB)

0

-120

-100

-80

-60

-40

-20

AV = +25V/V

AV = +51V/V

V

OUT

= 1Vp-p

-120

-90

-100

-110

-80

-70

-60

0 2.01.50.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0

TOTAL HARMONIC DISTORTION

vs. OUTPUT VOLTAGE SWING

MAX4174 TOC15

VOLTAGE SWING (Vp-p)

THD (dB)

AV = +1.25V/V

AV = +3V/V

AV = +10V/V

f = 10kHz

Typical Operating Characteristics (continued)

(VCC= +5V, RL = 100kΩ to VCC/ 2, small-signal V

OUT

= 100mVp-p, large-signal V

OUT

= 1Vp-p, TA= +25°C, unless otherwise noted.)

MAX4174/MAX4175

-120

-90

-100

-110

-80

-70

-60

0 2.01.50.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0

TOTAL HARMONIC DISTORTION

vs. OUTPUT VOLTAGE SWING

MAX4174 TOC16

VOLTAGE SWING (Vp-p)

THD (dB)

AV = +25V/V

AV = +51V/V

f = 10kHz

1 10 100 1k 10k 100k

VOLTAGE NOISE DENSITY vs. FREQUENCY

(A

V

= +1.25, +3, +10)

MAX4174/5 toc 17

FREQUENCY (Hz)

1000

10

100

AV = +10V/V

AV = +3V/V

AV = +1.25V/V

VOLTAGE NOISE DENSITY (nV/√Hz)

1 10 100 1k 10k 100k

VOLTAGE NOISE DENSITY vs. FREQUENCY

(A

V

= +25, +51)

MAX4174/5 toc 18

FREQUENCY (Hz)

1000

10

100

AV = +25V/V

AV = +51V/V

VOLTAGE NOISE DENSITY (nV/√Hz)

INCLUDES RESISTOR NOISE

1 10 100 1k 10k 100k

CURRENT NOISE DENSITY vs.

FREQUENCY

MAX4174/5 toc19

FREQUENCY (Hz)

10

1

CURRENT NOISE DENSITY (fA/√Hz)

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VCC= +5V, RL = 100kΩ to VCC/ 2, small-signal V

OUT

= 100mVp-p, large-signal V

OUT

= 1Vp-p, TA= +25°C, unless otherwise noted.)

2µs/div

C

L

= 0

INPUT

VOLTAGE

A

V

= +1.25V/V

OUTPUT

500mV/div

A

V

= +3V/V
OUTPUT

50mV/div

A

V

= +5V/V
OUTPUT

500mV/div

A

V

= +10V/V

OUTPUT

500mV/div

A

V

= +25V/V

OUTPUT

500mV/div

A

V

= +51V/V

OUTPUT

500mV/div

MAX4174/5 toc 20

LARGE-SIGNAL PULSE RESPONSE

2µs/div

C

L

= 0

INPUT

VOLTAGE

A

V

= +1.25V/V

OUTPUT

50mV/div

A

V

= +3V/V
OUTPUT

50mV/div

A

V

= +5V/V
OUTPUT

50mV/div

A

V

= +10V/V

OUTPUT

50mV/div

A

V

= +25V/V

OUTPUT

50mV/div

A

V

= +51V/V

OUTPUT

50mV/div

MAX4174/5 toc 21

SMALL-SIGNAL PULSE RESPONSE

MAX4174/MAX4175

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= +5V, RL = 100kΩ to VCC/ 2, small-signal V

OUT

= 100mVp-p, large-signal V

OUT

= 1Vp-p, TA= +25°C, unless otherwise noted.)

-200

-100

-150

50

0

-50

150

100

200

-50 -5 10-35 -20 25 40 55 70 85

INPUT OFFSET VOLTAGE vs.

TEMPERATURE

MAX4174/5 toc 25

TEMPERATURE (°C)

INPUT OFFSET VOLTAGE (µV)

VCC = 2.5V

VCC = 5.5V

-200

0

200

400

600

800

1000

-45 -15-30 0 153045607590

INPUT BIAS CURRENT

vs. TEMPERATURE

MAX4174/5 toc 26

TEMPERATURE (°C)

INPUT BIAS CURRENT (pA)

VCC = 2.5V

VCC = 5.5V

240

280

260

320

300

360

340

380

-50 -20 -5-35 10 25 40 55 70 85

SUPPLY CURRENT vs. TEMPERATURE

MAX4174/5 toc 27

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

VCC = 4V

VCC = 2.5V

VCC = 3V

VCC = 5V

VCC = 5.5V

-100

-60

-80

-20

-40

20

0

40

80

60

100

-50 -20 -5 10-35 25 40 55 70 85

VOH AND VOL vs. TEMPERATURE

(V

CC

= 2.5V)

MAX4174/5 toc 28

TEMPERATURE (°C)

VOLTAGE (mV)

VOL, R

L

= 1kΩ

VOL, R

L

= 10kΩ

VOL, R

L

= 100kΩ

VOH, R

L

= 10kΩ

VOH, R

L

= 100kΩ

VOH, R

L

= 1kΩ

-100

-60

-40

-20

-80

40

60

0

20

80

100

160

180

120

140

200

-50 -20 -5 10-35 25 40 55 70 85

VOH AND VOL vs. TEMPERATURE

(V

CC

= 5.5V)

MAX4174/5 toc 29

TEMPERATURE (°C)

VOLTAGE (mV)

VOL, R

L

= 1kΩ

VOL, R

L

= 100kΩ

VOL, R

L

= 100kΩ

VOH, R

L

= 10kΩ

VOH, R

L

= 100kΩ

VOH, R

L

= 1kΩ

MAX4174/MAX4175/MAX4281/MAX4282/MAX4284

-70

100 10k 100k1k 1M

POWER-SUPPLY REJECTION

vs. FREQUENCY

MAX4174 TOC22

FREQUENCY (Hz)

PSR (dB)

-95

-90

-85

-80

-75

100 10k 100k1k 1M

OUTPUT IMPEDANCE

vs. FREQUENCY

MAX4174 TOC23

FREQUENCY (Hz)

OUTPUT IMPEDANCE (Ω)

100

0.01

0.1

1

10

5.0

4.0
1 10 100

OUTPUT VOLTAGE SWING

vs. R

LOAD

MAX4174 TOC24

R

LOAD

(kΩ)

V

SWING

(Vp-p)

4.9

4.8

4.7

4.6

4.5

4.4

4.3

4.2

4.1

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

_______________________________________________________________________________________

9

1 10k 1M10010 1k 100k 10M

OPEN-LOOP GAIN AND PHASE

vs. FREQUENCY

MAX4174/5 toc30

FREQUENCY (Hz)

OPEN-LOOP GAIN (dB)

PHASE (degrees)

140
120
100

80
60
40

0

-20

-40

20

160

-45

-90

-135

-180

-225

-270

-315

0

4

-6

-5

1k 10k 100k 1M 10M

SMALL-SIGNAL GAIN

vs. FREQUENCY

-4

-3

MAX4174/5 toc31

FREQUENCY (Hz)

GAIN (dB)

-2

-1

0

1

2

3

4

-1

-2

-3

-4

-5

-6
1k 10k 100k 1M 10M

LARGE-SIGNAL GAIN

vs. FREQUENCY

0

MAX4174/5 toc32

FREQUENCY (Hz)

GAIN (dB)

1

2

3

0

-50

-60

-70

-80

-90

-100
1k 10k 100k100 1M 10M

COMMON-MODE REJECTION

vs. FREQUENCY

-40

MAX4174/5 toc33

FREQUENCY (Hz)

CMR (dB)

-30

-20

-10

0

-60

-80

-70

-90

-100

-110

-10

-20

-30

-40

-50

-120
1M1k 10k 100k

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

MAX4174/5 toc36

FREQUENCY (Hz)

THD (dB)

AV = 1
V

OUT

= 1Vp-p

1000

100

10

10 100 1k1 10k 100k

VOLTAGE NOISE DENSITY

vs. FREQUENCY

MAX4174/5 toc34

FREQUENCY (Hz)

VOLTAGE NOISE DENSITY (nV/√Hz)

10

1

10 100 1k1 10k 100k

CURRENT NOISE DENSITY

vs. FREQUENCY

MAX4174/5 toc35

FREQUENCY (Hz)

CURRENT NOISE DENSITY (fA/√Hz)

-50

-80

-90

-85

-95

-55

-60

-65

-70

-75

1M 10M1k 10k 100k

MAX4282

CROSSTALK vs. FREQUENCY

MAX4174/5 toc37

FREQUENCY (Hz)

CROSSTALK (dB)

-50

-55

-60

-65

-70

-75
1M 10M1k 10k 100k

MAX4284

CROSSTALK vs. FREQUENCY

MAX4174/5 toc38

FREQUENCY (Hz)

CROSSTALK (dB)

THREE AMPLIFIERS DRIVEN,
ONE OUTPUT MEASURED

Typical Operating Characteristics

(VCC= +5V, RL = 100kΩ to VCC/ 2, small-signal V

OUT

= 100mVp-p, large-signal V

OUT

= 1Vp-p, TA= +25°C, unless otherwise noted.)

MAX4281/MAX4282/MAX4284

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

10 ______________________________________________________________________________________

OUT

IN-

IN+

V

CC

V

EE

R

G

MAX4174

OUT

IN-

IN+

V

CC

V

EE

MAX4281

OUT

IN-

IN+

V

CC

V

CC

V

EE

V

EE

150k

150k

R

B

R

B

R

G

R

F

R

F

MAX4175

Functional Diagrams

Pin Description

16 QSOP14 SO/TSSOP5 SOT23 8 SO

MAX4281

8 SO/µMAX 8 SO/µMAX

MAX4274/

MAX4275

MAX4282

5 SOT23

FUNCTION

MAX4174/
MAX4175

1, 5,

8

—

No Connection.
Not internally
connected.

N.C.8, 9

—

—

75

—

—

Positive SupplyV

CC

44885

24

Inverting Amplifier
Input. Connects to
RGfor MAX4174/
4175/4274/4275.

IN-, INA-,

INB-, INC-,

IND-

2, 6,

11, 15

2, 6,

9, 13

2, 6

33

2, 64

Noninverting
Amplifier Input.
Internally biased to
VCC/ 2 for
MAX4175/MAX4275

IN+, INA+,

INB+, INC+,

IND+

3, 5,

12, 14

3, 5,

10, 12

3, 53, 53

42

Negative Supply or
Ground

V

EE

13114

61

42

Amplifier Output

OUT, OUTA,

OUTB,
OUTC,

OUTD

NAME

1, 7,

10, 16

1, 7,

8, 14

1, 71, 71

MAX4284

NAME FUNCTION

PIN

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

______________________________________________________________________________________ 11

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 V

CC

/ 2 bias

at the noninverting input (MAX4175/MAX4275). All
amplifiers feature rail-to-rail outputs and drive a 1kΩ
load while maintaining excellent DC accuracy.

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.

Internal Gain-Setting Resistors

Maxim’s proprietary laser trimming techniques produce
the necessary RF/RGvalues (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.

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-

ly increases usable bandwidth, while decompensation
above gains of +25V/V offers diminished returns.

V

CC

/ 2 Internal Bias

The MAX4175/MAX4275 GainAmp fixed-gain amplifiers
with the V

CC

/ 2 bias option are identical to standard
GainAmp fixed-gain amplifiers, with the added feature
of V

CC

/ 2 internal bias at the noninverting inputs. Two

150kΩ 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

OUT

A

V

=

-R

F

R

G

R

G

R

F

IN-

IN+

V

CC

V

EE

AV = 1 +

R

F

R

G

Figure 1. Internal Gain-Setting Resistors

FREQUENCY (Hz)

GAIN (dB)

60

0

10

20

30

40

-3dB

50

10 10k 100k 1M 10M100 1k

20kHz

230kHz

MAX4281, AV = 100
2MHz GBW

MAX4174,
A

V

= 100

23MHz GBW

Figure 2. Gain-Bandwidth Comparison

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

12 ______________________________________________________________________________________

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 RGat 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.

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.

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 RGinput 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).

OUT

IN-

IN+

R

G

R

F

5k

V

EE

V

EE

BIAS RESISTORS (MAX4175/MAX4275 ONLY)

NOTE: INPUT STAGE PROTECTION INCLUDES
TWO 17V SCRs AND TWO DIODES AT THE INPUT STAGE.

V

CC

V

CC

V

EE

MAX4174
MAX4175
MAX4274
MAX4275

17V

SCR

V

EE

17V

SCR

Figure 3. Input Protection

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

______________________________________________________________________________________ 13

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 V

CC

/ 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 1µF to 0.1µF 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.

MAX4281

V

CC

V

CC

R

G

R

F

V

IN

V

OUT

=

-R

F

(V

IN

)

R

G

Figure 4. Single-Supply, DC-Coupled Inverting Amplifier with
Negative Input Voltage

MAX4175

V

CC

R

G

R

B

R

B

R

F

V

IN

0.1µF

V

OUT

=

V

CC

- VIN

(

RF

)

2 R

G

Figure 6. Single-Supply, AC-Coupled Inverting Amplifier

MAX4174

V

EE

V

CC

R

G

R

F

V

IN

V

OUT

= - V

IN

(

RF

)

R

G

Figure 5. Dual-Supply, DC-Coupled Inverting Amplifier

MAX4174

V

EE

V

CC

R

G

R

F

V

IN

V

OUT

= V

IN

(1+

R

F

)

R

G

Figure 7. Dual-Supply, AC-Coupled Noninverting Amplifier

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

14 ______________________________________________________________________________________

MAX4174

V

EE

V

CC

R

G

R

F

R

ISO

C

L

R

L

OUTPUT

INPUT

Figure 9. Dual-Supply, Capacitive-Load Driving Circuit

Figure 10. Small-Signal/Large-Signal Transient Response with
Excessive Capacitive Load with Isolation Resistor

AV = +5V/V

50mV/div

INPUT

OUTPUT

OUTPUT

AV = +5V/V

500mV/div

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. A printed circuit board
with a low-inductance ground plane is recommended.

Capacitive-Load Stability

Driving large capacitive loads can cause instability in
most low-power, rail-to-rail output amplifiers. The fixed-

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
100Ω 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.

MAX4174

V

EE

V

CC

R

G

R

F

V

IN

V

OUT

= V

IN

(1+

R

F

)

R

G

Figure 8. Dual-Supply, DC-Coupled Noninverting Amplifier

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

______________________________________________________________________________________ 15

2µs/div

INPUT

A

V

= +1.25V/V

OUTPUT

50mV/div

A

V

= +3V/V
OUTPUT

50mV/div

A

V

= +5V/V
OUTPUT

50mV/div

A

V

= +10V/V

OUTPUT

50mV/div

A

V

= +25V/V

OUTPUT

50mV/div

A

V

= +51V/V

OUTPUT

50mV/div

Figure 11. MAX4174/MAX4175 Small-Signal Pulse Response
(C

L

= 250pF, RL= 100kΩ)

Figure 12. MAX4174/MAX4175 Small-Signal Pulse Response
(C

L

= 470pF, RL= 100kΩ)

2µs/div

INPUT

A

V

= +1.25V/V

OUTPUT

50mV/div

A

V

= +3V/V
OUTPUT

50mV/div

A

V

= +5V/V
OUTPUT

50mV/div

A

V

= +10V/V

OUTPUT

50mV/div

A

V

= +25V/V

OUTPUT

50mV/div

A

V

= +51V/V

OUTPUT

50mV/div

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

16 ______________________________________________________________________________________

Gain Selection Guide

RF/R

G

INVERTING

GAIN

1+ (RF/RG)

NONINVERTING

GAIN

AB* 0.25 1.25

-3dB BW
(kHz)

†

1700

GAIN

CODE

ACDS

AC 0.5 1.5 1280 ACDT

AD* 1 2 590 ACDU

AE 1.25 2.25 450 ACDV

TOP MARK

ACET

ACEU

ACEV

ACEW

AF 1.5 2.5 1180 ACDW ACEX

AG* 2 3 970 ACDX ACEY

AH 2.5 3.5 820 ACDY ACEZ

AJ 3 4 690 ACDZ ACFA

AK* 4 5 970 ACEA ACFB

AL 5 6 790 ACEB ACFC
AM 6 7 640 ACEC ACFD
AN 8 9 480 ACED ACFE

AO* 9 10 640 ACEE ACFF

BA* 10 11 560 ACEF ACFG

BB 12.5 13.5 460 ACEG ACFH
BC 15 16 390 ACEH ACFI
BD 20 21 300 ACEI ACFJ

BE* 24 25 590 ACEJ ACFK

BF 25 26 580 ACEK ACFL
BG 30 31 510 ACEL ACFM
BH 40 41 390 ACEM ACFN

BJ* 49 50 310 ACEN ACFO
BK* 50 51 330 ACEO ACFP

BL 60 61 310 ACEP ACFQ
BM 80 81 260 ACEQ ACFR

BN* 99 100 230 ACER ACFS
CA* 100 101 230 ACES 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.

MAX4174 MAX4175

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

______________________________________________________________________________________ 17

Pin Configurations (continued)

TOP VIEW

SOT23-5

MAX4275

8

7

6

5

1

2

3

4

V

CC

OUTB

INB-

INB+

µMAX/SO

OUTA

INA+

INA-

V

CC

V

CC

R

R

R

R

R

G

R

G

R

F

R

F

V

EE

MAX4175

5

4

1

2

3

OUT

V

CC

V

CC

V

EE

R

R

R

G

R

F

IN+

SOT23-5

MAX4281

5

4

1

2

3

IN-

OUT

V

CC

V

EE

IN+

MAX4274

8

7

6

5

1

2

3

4

V

CC

OUTB

INB-

INB+

µMAX/SO

OUTA

INA+

INA-

R

G

R

G

R

F

R

F

V

EE

MAX4282

8

7

6

5

1

2

3

4

V

CC

OUTB

INB-

INB+

µMAX/SO

SO/TSSOP

QSOP

OUTA

INA+

INA-

V

EE

MAX4284

16

15

14

13

1

2

3

4

OUTD

IND-

IND+

INC+

OUTA

INA+

INA-

V

CC

12

11

10

9

5

6

7

8

V

EE

INC-

OUTC

N.C.

INB+

OUTB

INB-

N.C.

MAX4284

14

13

12

11

1

2

3

4

OUTD

IND-

IND+

INC+

OUTA

INA+

INA-

V

CC

10

9

8

5

6

7

V

EE

INC-

OUTC

INB+

OUTB

INB-

MAX4281

8

7

6

5

1

2

3

4

V

CC

OUT

N.C.

N.C.

SO

N.C.

IN+

IN-

V

EE

-

+

-

+

-

+

-

+

-

+

-

+

­+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

18 ______________________________________________________________________________________

Ordering Information (continued)

TRANSISTOR COUNTS:

MAX4174: 178
MAX4175: 178
MAX4274: 332
MAX4275: 332
MAX4281: 178
MAX4282: 332
MAX4284: 328

SUBSTRATE CONNECTED TO V

EE

Selector Guide

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.

Chip Information

INVERTING GAINS

AVAILABLE (V/V)

(INVERTING, RF/RG)

NONINVERTING

GAIN

(V/V)

MAX4174_ -0.25 to -100 +1.25 to +101

INTERNAL

RESISTORS

Yes

INTERNAL

VCC/2 BIAS

PART*

No

NO. OF

AMPS PER

PACKAGE

1

PIN-PACKAGE

5-pin SOT23
MAX4175_ -0.25 to -100 +1.25 to +101 Yes Yes 1 5-pin SOT23
MAX4274_ -0.25 to -100 +1.25 to +101 Yes No 2 8-pin µMAX/SO
MAX4275_ -0.25 to -100 +1.25 to +101 Yes Yes 2 8-pin µMAX/SO

MAX4281_

Open Loop,

Unity-Gain Stable

No No 1

5-pin SOT23,

8-pin SO

MAX4282_

Open Loop,

Unity-Gain Stable

No No 2 8-pin µMAX/SO

MAX4284_

Open Loop,

Unity-Gain Stable

No No 4

14-pin SO/TSSOP,

16-pin QSOP

PART*

MAX4281EUK-T

-40°C to +85°C

MAX4274_EUA

-40°C to +85°C

5 SOT23-5

MAX4281ESA

TEMP. RANGE

PIN-

PACKAGE

-40°C to +85°C 8 SO

8 µMAX

MAX4274_ESA

MAX4284EUD

-40°C to +85°C

MAX4282EUA

-40°C to +85°C

-40°C to +85°C 8 SO

14 TSSOP

MAX4284EEE -40°C to +85°C 16 QSOP

8 µMAX

MAX4282ESA -40°C to +85°C 8 SO

MAX4275_EUA

-40°C to +85°C 8 µMAX

MAX4275_ESA -40°C to +85°C 8 SO

ACDR

TOP

MARK

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Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number.

MAX4284ESD -40°C to +85°C 14 SO —

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

SOT23, Rail-to-Rail, Fixed-Gain

GainAmps/Open-Loop Op Amps

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SOT5L.EPS

Package Information

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

SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps

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

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8LUMAXD.EPS

Package Information