Datasheet MAX4127ESD, MAX4127C-D, MAX4125EUA, MAX4125ESA, MAX4124EUK Datasheet (Maxim)

General Description

The MAX4122–MAX4129 family of operational amplifiers
combines wide bandwidth and excellent DC accuracy with
Rail-to-Rail®operation at the inputs and outputs. These
devices require only 650µA per amplifier, and operate from
either a single supply (+2.7V to +6.5V) or dual supplies
(±1.35V to ±3.25V) with a common-mode voltage range
that extends 250mV beyond VEEand VCC. They are capa­ble of driving 250Ω loads. The MAX4122/MAX4123/
MAX4126/MAX4127/MAX4129 have a 5MHz gain band­width product, while the decompensated MAX4124/
MAX4125/MAX4128 (stable at closed-looped gains of
10 or greater) have a 25MHz gain bandwidth product. In
addition, the MAX4123/MAX4125/MAX4127 feature a
shutdown mode in which the outputs are placed in a
high-impedance state and the supply current is reduced
to only 25µA per amplifier.

With their rail-to-rail input common-mode range and
output swing, these amplifiers are ideal for low-voltage
single-supply operation. Although the minimum operat­ing voltage is specified at 2.7V, the devices typically
operate down to 1.8V. In addition, low offset voltage
and high speed make them the ideal signal-condition­ing stages for precision, low-voltage, data-acquisition
systems. The MAX4122 and MAX4124 come in the

space-saving 5-pin SOT23-5 package.

________________________Applications

Battery-Powered Instruments
Portable Equipment
Data-Acquisition Systems
Signal Conditioning
Low-Power, Low-Voltage Applications

Features

♦ 5-Pin SOT23 Package (MAX4122/4)
♦ +2.7V to +6.5V Single-Supply Operation
♦ Rail-to-Rail Input Common-Mode Voltage Range
♦ Rail-to-Rail Output Voltage Swing
♦ 5MHz Gain-Bandwidth Product (MAX4122/3/6/7/9)

25MHz Gain-Bandwidth Product (MAX4124/5/8)

♦ 650µA Quiescent Current per Amplifier
♦ 25µA Shutdown Function (MAX4123/5/7)
♦ 200µV Offset Voltage
♦ No Phase Reversal for Overdriven Inputs
♦ Drive 250Ω Loads
♦ Stable with 500pF Capacitive Loads
♦ Unity-Gain Stable (MAX4122/3/6/7/9)

Stable at Gains ≥ 10V/V (MAX4124/5/8)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

________________________________________________________________

Maxim Integrated Products

1

MAX187

MAX4123

SHDN

3

1

2

4

5

6

8

7

V

DD

+5V

AIN

VREF

GND

DOUT

SERIAL

INTERFACE

SCLK

CS

__________Typical Operating Circuit

Selection Table

19-1087; Rev 1; 8/97

PART

MAX4122EUK
MAX4123C/D

MAX4123ESA -40°C to +85°C

0°C to +70°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5
Dice*
8 SO

Ordering Information

Ordering Information continued at end of data sheet.

*

Dice are specified at TA= +25°C, DC parameters only.

Pin Configurations appear at end of data sheet.

MARKING

INFO.

AAAZ

—
—

BW

(MHz)

AMPS

PER

PKG.

MAX4122 5 1
MAX4123 5 1

PART

MAX4124 25 1
MAX4125 25 1
MAX4126 5 2
MAX4127 5 2
MAX4128 25 2
MAX4129 5 4

SHUT­DOWN
MODE

—

Yes

—

Yes

—

Yes

—
—

PIN-

PACKAGE

5 SOT23-5
8 SO/µMAX
5 SOT23-5
8 SO/µMAX
8 SO/µMAX
14 SO
8 SO/µMAX
14 SO

MAX4123EUA -40°C to +85°C 8 µMAX —

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +6.5V, VEE= 0V, VCM= 0V, V

OUT

= VCC/2, RLtied to VCC/2, SHDN ≥ 2V (or open), TA= +25°C, unless

otherwise noted.)

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 (VCC-VEE).....................................................7.5V

IN+, IN-, SHDN Voltage...................(V

CC

+ 0.3V) to (VEE- 0.3V)

Output Short-Circuit Duration (Note 1).......................Continuous

(short to either supply)

Continuous Power Dissipation (T

A

= +70°C)

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

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

8-pin µMAX (derate 4.10mW/°C above +70°C)............330mW

14-pin SO (derate 8.00mW/°C above +70°C)...............640mW

Operating Temperature Range

MAX412_E__ ....................................................-40°C to +85°C

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

Storage Temperature Range.............................-65°C to +160°C

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

V

CM

= VEEto V

CC

MAX4123ESA/MAX4125ESA

CONDITIONS

nA±1 ±12Input Offset Current

nA±50 ±150Input Bias Current

72 80

Ω0.1Output Resistance

kΩ500Differential Input Resistance

78 98

dB78 100Power-Supply Rejection Ratio

UNITSMIN TYP MAXPARAMETER

V

OUT

= 0.4V to 4.6V, RL= 250Ω 75 84

dBLarge-Signal Voltage Gain

V

VEE- VCC+

0.25 0.25

Common-Mode Input
Voltage Range

Note 1: Provided that the maximum package power-dissipation rating is met.

MAX4122EUK/MAX4124EUK ±0.35 ±1.50
MAX4123EUA/MAX4125EUA ±0.35 ±1.20

±0.20 ±0.60

MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA ±0.40 ±1.50
MAX4129ESD ±0.35 ±1.50

Input Offset Voltage

±0.25 ±0.75

VCM=
VEEto V

CC

MAX4123ESA/MAX4125ESA

mV

VCM= VEEto V

CC

-1.5V < V

DIFF

< 1.5V

VCC= 2.7V to 6.5V
AV= 1
SHDN < 0.8V, V

OUT

= 0V to V

CC

µA±0.1 ±1Off-Leakage Current

MAX4122EUK/MAX4124EUK

(V

EE

-

0.25) <
VCM<
(VCC+

0.25V)

67 90

Common-Mode Rejection Ratio

MAX4129ESD

MAX4126EUA/MAX4128EUA

64 84

dB

66 86

MAX4126ESA/MAX4127ESD/MAX4128ESA

MAX4123EUA/MAX4125EUA

74 94

68 88

VCC= 5V

V

OUT

= 0.4V to 2.3V, RL= 250Ω

V

OUT

= 0.25V to 2.45V, RL= 100kΩ

V

OUT

= 0.25V to 4.75V, RL= 100kΩ

VCC= 2.7V

92 104

94 106

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +6.5V, VEE= 0V, VCM= 0V, V

OUT

= VCC/2, RLtied to VCC/2, SHDN ≥ 2V (or open), TA= -40°C to +85°C, unless

otherwise noted.)

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +6.5V, VEE= 0V, VCM= 0V, V

OUT

= VCC/2, RLtied to VCC/2, SHDN ≥ 2V (or open), TA= +25°C, unless

otherwise noted.)

RL= 100kΩ

CONDITIONS

20 35

Low

V2.7 6.5Operating Supply-Voltage Range

SHDN > 0.8V,
MAX4123/MAX4125/MAX4127

240 290

12 20

VOL- V

EE

125 170

MAX4122/
MAX4123/
MAX4124/
MAX4125

V

0.8

mA50Output Short-Circuit Current

µA

40 60

Shutdown Supply Current
per Amplifier

UNITS

MIN TYP MAX

PARAMETER

VCC- V

OH

VOL- V

EE

VCC- V

OH

RL= 250Ω

VCC- V

OH

VOL- V

EE

VCC- V

OH

RL= 250Ω

RL= 100kΩ

25 40

mV

280 330

15 30

VOL- V

EE

Output Voltage Swing

180 230

MAX4126/
MAX4127/
MAX4128/
MAX4129

High 2.0

SHDN Logic Threshold

MAX4123/MAX4125/MAX4127

VCC= 5V

MAX4123/MAX4125/MAX4127 µA±1 ±3

SHDN Input Current

VCC= 2.7V

VCM= V

OUT

= VCC/2 µA

650 750

VCC= 5V 725 825

Supply Current per Amplifier

VCC= 2.7V 25 40

MAX4122EUK/MAX4124EUK

(VEE-

0.2V) <
VCM<
(VCC+

0.2V)

MAX4123ESA/MAX4125ESA

MAX4129ESD

MAX4122EUK/MAX4124EUK

MAX4123ESA/MAX4125ESA

CONDITIONS

±3.50

62

VCM= VEEto V

CC

MAX4123EUA/MAX4125EUA

V

VEE- VCC+

0.20 0.20

Common-Mode Input
Voltage Range

mV

±4.40

±0.75

MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA ±4.70
MAX4129ESD

Common-Mode Rejection Ratio

±4.00

Input Offset Voltage

±0.95

VCM=
VEEto V

CC

nA±18

MAX4126EUA/MAX4128EUA

Input Offset Current

µV/°C±2

60

dB

58

MAX4126ESA/MAX4127ESD/MAX4128ESA

Input Offset Voltage Tempco

MAX4123EUA/MAX4125EUA

74

60

76

UNITSMIN TYP MAXPARAMETER

VCM= VEEto V

CC

nA±160Input Bias Current

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

4 _______________________________________________________________________________________

86

Large-Signal Voltage Gain

68

V

OUT

= 0.25V to 4.75V, RL= 100kΩ

V

OUT

= 0.4V to 4.6V, RL= 250Ω

VCC= 5V

84

dB

66

V

OUT

= 0.25V to 2.45V, RL= 100kΩ

V

OUT

= 0.4V to 2.3V, RL= 250Ω

VCC= 2.7V

Off-Leakage Current ±12 µA

SHDN < 0.8V, V

OUT

= 0V to V

CC

MAX4122/
MAX4123/
MAX4124/
MAX4125

190VOL- V

EE

25

300

MAX4126/
MAX4127/
MAX4128/
MAX4129

250

Output Voltage Swing

VOL- V

EE

35

350

mV

50

RL= 100kΩ

RL= 250Ω

VCC- V

OH

VOL- V

EE

VCC- V

OH

40

RL= 100kΩ

RL= 250Ω

VCC- V

OH

VOL- V

EE

VCC- V

OH

PARAMETER

MIN TYP MAX

UNITS

Shutdown Supply Current
per Amplifier

70

µA

Power-Supply Rejection Ratio 74 dB

0.8
V

SHDN < 0.8V,
MAX4123/MAX4125/MAX4127

Operating Supply-Voltage Range 2.7 6.5 V

775

µAVCM= V

OUT

= VCC/2

VCC= 2.7V

SHDN Input Current

Low

±3

CONDITIONS

µA

50

MAX4123/MAX4125/MAX4127

VCC= 2.7V to 6.5V

VCC= 2.7V
VCC= 5V

MAX4123/MAX4125/MAX4127

Supply Current per Amplifier

SHDN Logic Threshold

850

2.0High

VCC= 5V

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +6.5V, VEE= 0V, VCM= 0V, V

OUT

= VCC/2, RLtied to VCC/2, SHDN ≥ 2V (or open), TA= -40°C to +85°C, unless

otherwise noted.)

f = 10kHz, V

OUT

= 2Vp-p,

MAX4122/23/26/27/29 (A

V

= 1)

MAX4124/25/28 (AV≥ 10), V

OUT

= 2V step

MAX4122/23/26/27/29

VCC= 0V to 3V step, V

OUT

= VCC/2

64

MAX4124/25/28 (AV≥ 10)

MAX4124/25/28 (AV≥ 10)

degrees

MAX4122/23/26/27/29 (AV= 1), V

OUT

= 2V step

MAX4122/23/26/27/29

CONDITIONS

MAX4122/23/26/27/29

µs

1.3

60

5

Phase Margin

MAX4124/25/28 (AV≥ 10)

MAX4122/23/26/27/29

MHz

25

Gain-Bandwidth Product

12

MAX4124/25/28 (AV≥ 10)

%0.003

dB

Total Harmonic Distortion

10

Gain Margin

Settling Time to 0.01%

2.0

µs1Turn-On Time

V/µs

10

Slew Rate

2

UNITSMIN TYP MAXPARAMETER

AC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +6.5V, VEE= 0V, SHDN ≥ 2V (or open), TA= +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________ 5

60

-40
100 1k 10k 1M 10M100k 100M

MAX4322/26/29

GAIN AND PHASE vs. FREQUENCY

-20

FREQUENCY (Hz)

GAIN (dB)

0

20

40

PHASE

GAIN

AV = +1000
NO LOAD

PHASE (DEGREES)

180
144

72

0

-72

-144

-180

-108

-36

36

108

MAX4322/26/29-01

60

-40
100 1k 10k 1M 10M100k 100M

MAX4122/23/26/27/29

GAIN AND PHASE vs. FREQUENCY

(WITH C

LOAD

)

-20

MAX4122/29-02

FREQUENCY (Hz)

GAIN (dB)

0

20

40

PHASE

GAIN

AV = +1000
R

L

= ∞

C

L

= 500pF

PHASE (DEGREES)

180
144

72

0

-72

-144

-180

-108

-36

36

108

0

-100

10 100 1k 100k 1M 10M10k 100M

MAX4122/23/26/27/29

POWER-SUPPLY REJECTION

vs. FREQUENCY

-80

MAX4122/29-03

FREQUENCY (Hz)

PSR (dB)

-60

-40

-20

AV = +1

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= 0V, VCM= VCC/2, TA = +25°C, unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +6.5V, VEE= 0V, SHDN ≥ 2V (or open), TA= +25°C, unless otherwise noted.)

MAX4124/25/28 (AV≥ 10)

MAX4122/23/26/27/29 (AV= 1)

MAX4126/27/28/29

f = 1kHz

f = 1kHz

VCC= 3V, V

OUT

= VCC/2,

MAX4123/25/27

CONDITIONS

pF

500

Capacitive Load Stability

500

dB135Amp-Amp Isolation

pA/√Hz

0.4Input Noise Current Density

nV/√Hz

22Input Noise Voltage Density

pF3Input Capacitance

µs

0.2

SHDN Delay

1

UNITSMIN TYP MAXPARAMETER

Enable
Disable

60

-40
100 1k 10k 100k 1M 10M

MAX4124/25/28

GAIN AND PHASE vs. FREQUENCY

-20

MAX14122/29-04

FREQUENCY (Hz)

GAIN (dB)

PHASE (DEGREES)

0

20

40

180
144

-180

-144

-108

-72

-36

36
0

108
72

AV = +1000
NO LOAD

GAIN

PHASE

60

-40
100 1k 10k 1M 10M100k 100M

MAX4124/25/28

GAIN AND PHASE vs. FREQUENCY

(WITH C

LOAD

)

-20

MAX4122/29-05

FREQUENCY (Hz)

GAIN (dB)

0

20

40

PHASE

GAIN

AV = +1000
R

L

= ∞

C

L

= 500 pF

PHASE (DEGREES)

180
144

72

0

-72

-144

-180

-108

-36

36

108

0

-100

10 100 1k 100k 1M 10M10k 100M

MAX4124/25/28

POWER-SUPPLY REJECTION

vs. FREQUENCY

-80

MAX4122/29-06

FREQUENCY (Hz)

PSR (dB)

-60

-40

-20

AV = +10

Typical Operating Characteristics (continued)

(VCC= +5V, VEE= 0V, VCM= VCC/2, TA = +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

6 _______________________________________________________________________________________

1k 10k 10M

FREQUENCY (Hz)

100k 1M100

130

50

60

70

80

90

100

110

120

MAX4126/27/28/29

CHANNEL SEPARATION vs. FREQUENCY

MAX4122/29-07

CHANNEL SEPARATION (dB)

100

0.01
100 1k 100k 1M

10M

10k 100M

MAX4122/23/26/27/29

OUTPUT IMPEDANCE

vs. FREQUENCY

0.1

MAX4122/29-08

FREQUENCY (Hz)

OUTPUT IMPEDANCE (Ω)

1

10

AV = +1

100

0.1
100 1k 100k 1M

10M

10k 100M

MAX4124/25/28

OUTPUT IMPEDANCE

vs. FREQUENCY

MAX4122/29-09

FREQUENCY (Hz)

OUTPUT IMPEDANCE (Ω)

1

10

AV = +10

900

500

550

600

650

700

750

800

850

-40 -25 -10 5 20 35 50 65 80 95

SUPPLY CURRENT PER AMPLIFIER

vs. TEMPERATURE

MAX4122/29-10

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

VCC = 6.5V

VCC = 2.7V

0

10

20

30

40

50

60

-40 -25 -10 5 20 35 50 65 80 95

MAX4323/MAX4327

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX4322-11

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT (mA)

VCC = 6.5V

VCC = 2.7V

SHDN = 0V

-10

-5

0

5

10

15

20

-40 -25 -10 5 20 35 50 65 80 95

OUTPUT LEAKAGE CURRENT

vs. TEMPERATURE

MAX4122/29-12

TEMPERATURE (°C)

LEAKAGE CURRENT (µA)

VCC = 6.5V

V

OUT

SHORT

TO V

CC

VCC = 2.7V

VCC = 6.5V

V

OUT

SHORT

TO V

EE

VCC = 2.7V

AV = +1
SHDN = 0V

-3.00

-2.25

-0.75

-1.50

0

1.50

0.75

2.25

3.00

-40 -25 -10 5 20 35 50 65 80 95

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

MAX4122/29-13

TEMPERATURE (°C)

VOLTAGE (mV)

SOT23-5
PACKAGE

SO PACKAGE

-50
0 1 2 3 4 5 6

INPUT BIAS CURRENT

vs. COMMON-MODE VOLTAGE

MAX4122/29-14

COMMON-MODE VOLTAGE (V)

INPUT BIAS CURRENT (nA)

-40

-30

-20

-10

0

10

20

30

40

50

VCC = 2.7V

VCC = 6.5V

-60

-50

-40 -25 -10 5 20 35 50 65 80 95

INPUT BIAS CURRENT

vs. TEMPERATURE

MAX4122/29-15

TEMPERATURE (°C)

INPUT BIAS CURRENT (nA)

-40

-30

-20

-10

0

10

20

30

40

50

VCC = 6.5V, VCM = V

CC

VCC = 2.7V, VCM = V

EE

VCC = 2.7V, VCM = V

CC

VCC = 6.5V, VCM = V

EE

Typical Operating Characteristics (continued)

(VCC= +5V, VEE= 0V, VCM= VCC/2, TA = +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________

7

120

80

85

90

95

100

105

110

115

-40 -25 -10 5 20 35 50 65 80 95

COMMON-MODE REJECTION

vs. TEMPERATURE

MAX4122/29-16

TEMPERATURE (°C)

COMMON-MODE REJECTION (dB)

VCM = 0V TO 5.0V

VCM = 0.2V TO 5.2V

VCM = 0.3V TO 5.3V

120

60

0 600

110

OUTPUT VOLTAGE: EITHER SUPPLY (mV)

GAIN (dB)

300

90

80

70

100 200 500

100

400

MAX4122/29-19

LARGE-SIGNAL GAIN

vs. OUTPUT VOLTAGE

VCC = 2.7V

RL TO V

EE

RL = 500Ω

RL = 100kΩ

RL = 10kΩ

RL = 2kΩ

250

0

-40 -25 -10 5 20 35 50 65 80 95

MINIMUM OUTPUT VOLTAGE

vs. TEMPERATURE

50

200

MAX4122/29-17

TEMPERATURE (°C)

V

OUT

- V

EE

(mV)

150

100

RL TO V

CC

VCC = 6.5V, RL = 500Ω

VCC = 2.7V, RL = 100kΩ

VCC = 2.7V, RL = 500Ω

VCC = 6.5V, RL = 100kΩ

0

50

100

150

200

250

300

-40 -25 -10 5 20 35 50 65 80 95

MAXIMUM OUTPUT VOLTAGE

vs. TEMPERATURE

MAX4122/29-18

TEMPERATURE (°C)

V

CC

- V

OUT

(mV)

RL TO V

EE

VCC = 6.5V, RL = 500Ω

VCC = 2.7V, RL = 100kΩ (BOTTOM)

VCC = 2.7V, RL = 500Ω

VCC = 6.5V, RL = 100kΩ (TOP)

120

60

0 600

110

OUTPUT VOLTAGE: EITHER SUPPLY (mV)

GAIN (dB)

300

90

80

70

100 200 500

100

400

MAX4122/29-20

LARGE-SIGNAL GAIN

vs. OUTPUT VOLTAGE

VCC = 6.5V

RL TO V

EE

RL = 500Ω

RL = 100kΩ

RL = 10kΩ

RL = 2kΩ

125

75

-40 -25 -10 5 20 35 50 65 80 95

LARGE-SIGNAL GAIN

vs. TEMPERATURE

85

115

MAX4122/29-21

TEMPERATURE (°C)

GAIN (dB)

105

95

80

90

120

110

100

VCC = 2.7V,
R

L

TO V

EE

VCC = 6.5V, RL TO V

CC

VCC = 2.7V, RL TO V

CC

RL = 500Ω
V

OUT

(p-p) = V

CC

- 1V

VCC = 6.5V,
R

L

TO V

EE

120

60

0 600

110

GAIN (dB)

300

90

80

70

100 200 500

100

400

MAX4122/29-22

LARGE-SIGNAL GAIN

vs. OUTPUT VOLTAGE

RL = 500Ω

RL = 100kΩ

RL = 10kΩ

RL = 2kΩ

VCC = 2.7V
R

L

TO V

CC

OUTPUT VOLTAGE: EITHER SUPPLY (mV)

120

60

0 600

110

GAIN (dB)

300

90

80

70

100 200 500

100

400

MAX4122/29-23

LARGE-SIGNAL GAIN

vs. OUTPUT VOLTAGE

VCC = 6.5V
RL TO V

CC

RL = 500Ω

RL = 100kΩ

RL = 10kΩ

RL = 2kΩ

OUTPUT VOLTAGE: EITHER SUPPLY (mV)

125

75

-40 -25 -10 5 20 35 50 65 80 95

LARGE-SIGNAL GAIN

vs. TEMPERATURE

85

115

MAX4122/29-24

TEMPERATURE (°C)

GAIN (dB)

105

95

80

90

120

110

100

V

OUT

(p-p) = V

CC

- 600mV

R

L

= 100kΩ

VCC = 6.5V, RL TO V

EE

VCC = 2.7V, RL TO V

CC

VCC = 2.7V, RL TO V

EE

VCC = 6.5V, RL TO V

CC

Typical Operating Characteristics (continued)

(VCC= +5V, VEE= 0V, VCM= VCC/2, TA = +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

8 _______________________________________________________________________________________

IN

(5mV/div)

TIME (200ns/div)

OUT

(50mV/div)

AV = +10

MAX4124/25/28

SMALL-SIGNAL TRANSIENT

RESPONSE (NONINVERTING)

MAX4122/29-31

IN

(5mV/div)

TIME (200ns/div)

OUT

(50mV/div)

AV = -10

MAX4124/25/28

SMALL-SIGNAL TRANSIENT

RESPONSE (INVERTING)

MAX4122/29-32

IN

(2V/div)

TIME (2µs/div)

OUT

(2V/div)

AV = -1

MAX4122/23/26/27/29

LARGE-SIGNAL TRANSIENT

RESPONSE (INVERTING)

MAX4122/29-34

1.2

1.3

1.5

1.4

1.6

1.7

1.8

1.9

-40 -25 -10 5 20 35 50 65 80 95

MAX4123

MINIMUM OPERATING VOLTAGE

vs. TEMPERATURE

MAX4122/29-25

TEMPERATURE (°C)

MINIMUM OPERATING VOLTAGE (V)

IN

TIME (200ns/div)

VOLTAGE (50mV/div)

OUT

AV = +1

MAX4122/23/26/27/29

SMALL-SIGNAL TRANSIENT

RESPONSE (NONINVERTING)

MAX4122/29-28

10 100k10k

FREQUENCY (Hz)

100 1k

0.040

0

0.005

0.010

0.015

0.020

0.025

0.030

0.035

MAX4122/23/26/27/29 TOTAL HARMONIC

DISTORTION AND NOISE vs. FREQUENCY

MAX4122/29-26

THD & NOISE (%)

AV = +1
2V

p-p

SIGNAL
500kHz LOWPASS FILTER
R

L

= 10kΩ TO VCC/2

0.1

0.001

4.0 4.44.2 5.04.84.6

MAX4123

TOTAL HARMONIC DISTORTION AND NOISE

vs. PEAK-TO-PEAK SIGNAL AMPLITUDE

MAX4122/29-27

PEAK-TO-PEAK SIGNAL AMPLITUDE (V)

THD + N (%)

0.01

AV = +1
10kHz SINEWAVE
R

L

TO VCC/2

500kHz LOWPASS FILTER

RL = 10kΩ

RL = 100kΩ

RL = 2kΩ

RL = 250Ω

IN

TIME (200ns/div)

VOLTAGE (50mV/div)

OUT

AV = -1

MAX4122/23/26/27/29

SMALL-SIGNAL TRANSIENT

RESPONSE (INVERTING)

MAX4122/29-29

IN

TIME (2µs/div)

VOLTAGE (2V/div)

OUT

AV = +1

MAX4122/23/26/27/29

LARGE-SIGNAL TRANSIENT

RESPONSE (NONINVERTING)

MAX4122/29-30

Typical Operating Characteristics (continued)

(VCC= +5V, VEE= 0V, VCM= VCC/2, TA = +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________

9

IN

(200mV/div)

TIME (2µs/div)

OUT

(2V/div)

AV = +10

MAX4124/25/28

LARGE-SIGNAL TRANSIENT

RESPONSE (NONINVERTING)

MAX4122/29-33

IN

(200mV/div)

TIME (2µs/div)

OUT

(2V/div)

AV = -10

MAX4124/25/28

LARGE-SIGNAL TRANSIENT

RESPONSE (INVERTING)

MAX4122/29-35

Pin Description

Inverting Inputs for Amps 1 and 2IN1-, IN2-—
Noninverting Inputs for Amps 1 and 2IN1+, IN2+—
Shutdown Control for Amps 1 and 2. Tie

high or leave floating to enable amplifier.

SHDN1,

SHDN2

—

Outputs for Amps 3 and 4OUT3, OUT4—
Inverting Inputs for Amps 3 and 4IN3-, IN4-—

Positive SupplyV

CC

5

No ConnectN.C.—
Shutdown Control. Tie high or leave floating

to enable amplifier.

SHDN

—

Outputs for Amps 1 and 2OUT1, OUT2—

Inverting InputIN-4

Noninverting Input IN+3

Negative Supply. Ground for single-supply
operation.

V

EE

2

OutputOUT1

—
—

—

—
—

7

1, 5

8

—

2

3

4

6

2, 6
3, 5

—

—
—

8

—

—

1, 7

—

—

4

—

2, 12
3, 11

6, 9

—
—

14

5, 7, 8, 10

—

1, 13

—

—

4

—

2, 6
3, 5

—

8, 14
9, 13

4

—

—

1, 7

—

—

11

—

Noninverting Inputs for Amps 3 and 4IN3+, IN4+— — — — 10, 12

PIN

MAX4122
MAX4124

FUNCTIONNAME

MAX4123
MAX4125

MAX4126
MAX4128

MAX4127 MAX4129

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

10 ______________________________________________________________________________________

1k

1k

Figure 2. Input Protection Circuit

R3

R3 = R1 R2

R1 R2

MAX4122–

MAX4129

Figure 1a. Reducing Offset Error Due to Bias Current
(Noninverting)

R3

R3 = R1 R2

R1 R2

MAX4122–

MAX4129

Figure 1b. Reducing Offset Error Due to Bias Current
(Inverting)

Applications Information

Rail-to-Rail Input Stage

Devices in the MAX4122–MAX4129 family of high­speed amplifiers have rail-to-rail input and output
stages designed for low-voltage single-supply opera­tion. The input stage consists of separate NPN and
PNP differential stages, which combine to provide an
input common-mode range extending 0.2V beyond the
supply rails. The PNP stage is active for input voltages
close to the negative rail, and the NPN stage is active
for input voltages near the positive rail. The input offset
voltage is typically below 200µV. The switchover transi­tion region, which occurs near VCC/ 2, has been
extended to minimize the slight degradation in CMRR
caused by the mismatch of the input pairs. Their low
offset voltage, high bandwidth, and rail-to-rail common­mode range make these op amps excellent choices for
precision low-voltage data-acquisition systems.

Since the input stage switches between the NPN and
PNP pairs, the input bias current changes polarity as
the input voltage passes through the transition region.
To reduce the offset error caused by input bias cur­rents flowing through external source impedances,
match the effective impedance seen by each input
(Figures 1a, 1b). High source impedances, together
with the input capacitance, can create a parasitic pole
that produces an underdamped signal response.
Reducing the input impedance or placing a small (2pF
to 10pF) capacitor across the feedback resistor
improves the response.

The MAX4122–MAX4129’s inputs are protected from
large differential input voltages by 1kΩ series resistors
and back-to-back triple diodes across the inputs
(Figure 2). For differential input voltages less than 1.8V
the input resistance is typically 500kΩ. For differential
input voltages greater than 1.8V the input resistance is
approximately 2kΩ, and the input bias current is
determined by the following equation:

Rail-to-Rail Output Stage

The minimum output voltage will be within millivolts of
ground for single-supply operation where the load is
referenced to ground (VEE). Figure 3 shows the input
voltage range and output voltage swing of a MAX4123
connected as a voltage follower. With a +3V supply
and the load tied to ground, the output swings from

0.00V to 2.90V. The maximum output voltage swing
depends on the load, but will be within 150mV of a +3V
supply, even with the maximum load (500Ω to ground).

Driving a capacitive load can cause instability in most
high-speed op amps, especially those with low quiescent
current. The MAX4122–MAX4129 have a high tolerance
for capacitive loads. They are stable with capacitive
loads up to 500pF. Figure 4 gives the stable operating
region for capacitive loads. Figures 5–8 show the
response with capacitive loads, and the results of adding
an isolation resistor in series with the output (Figure 9).
The resistor improves the circuit’s phase margin by iso­lating the load capacitor from the op amp’s output.

I =

V - 1.8V

2k

BIAS

DIFF

Ω

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

______________________________________________________________________________________ 11

IN

TIME (2µs/div)

VOLTAGE (1V/div)

OUT

VCC = 3V
A

V

= +1

Figure 3. Rail-to-Rail Input /Output Voltage Range

10,000

100

100 1k 100k10k

RESISTIVE LOAD (Ω)

CAPACITIVE LOAD (pF)

1000

UNSTABLE

REGION

RL TO V

EE

V

OUT

= VCC/2

Figure 4. Capacitive-Load Stability

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

12 ______________________________________________________________________________________

IN

TIME (400ns/div)

VOLTAGE (50mV/div)

OUT

A

V

= +1

C

L

= 500pF

Figure 5. MAX4122/23/26/27/29 Small-Signal Transient
Response with Capacitive Load

IN

TIME (400ns/div)

VOLTAGE (50mV/div)

OUT

AV = +1
C

L

= 1000pF

R

S

= 39Ω

Figure 7. MAX4122/23/26/27/29 Transient Response to
Capacitive Load with Isolation Resistor

IN

TIME (1µs/div)

VOLTAGE

OUT

AV = +10
C

L

= 500pF

(5mV/div)

(50mV/div)

Figure 6. MAX4124/25/28 Small-Signal Transient Response
with Capacitive Load

IN

TIME (1µs/div)

VOLTAGE

OUT

AV = +10
CL = 1000pF
RS = 56Ω

(5mV/div)

(50mV/div)

Figure 8. MAX4124/25/28 Transient Response to Capacitive
Load with Isolation Resistor

R

S

C

L

Figure 9. Capacitive-Load-Driving Circuit

SHDN

V

OUT

0V TO 2.7V
STEP FOR
SHUTDOWN
TEST

0V TO 2.7V

STEP FOR

POWER-UP

TEST. 2.7V

FOR SHUTDOWN

ENABLE TEST.

SUPPLY-CURRENT

MONITORING POINT

V

CC

10Ω2k

10k

2k

Figure 10. Power-Up/Shutdown Test Circuit

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

______________________________________________________________________________________ 13

V

CC

TIME (5µs/div)

VOLTAGE (1V/div)

OUT

Figure 11. Power-Up Output Voltage

SHDN

(1V/div)

TIME (2µs/div)

OUT

(0.5V/div)

VCC = 2.7V
R

L

= 10kΩ

Figure 13. Shutdown Output Voltage

V

CC

(1V/div)

TIME (5µs/div)

I

CC

(500µA/div)

Figure 12. Power-Up Supply Current

SHDN

(1V/div)

TIME (2µs/div)

I

CC

(500µA/div)

VCC = 2.7V

Figure 14. Shutdown Enable/Disable Supply Current

Power-Up and Shutdown Mode

The MAX4122–MAX4129 amplifiers typically settle with­in 1µs after power-up. Using the test circuit of Figure
10, Figures 11 and 12 show the output voltage and
supply current on power-up.

The MAX4123, MAX4125, and MAX4127 have a shut­down option. When the shutdown pin (SHDN) is pulled
low, the supply current drops below 25µA per amplifier
and the amplifiers are disabled with the outputs in a
high-impedance state. Pulling SHDN high or leaving it
floating enables the amplifier. In the dual-amplifier
MAX4129, the shutdown functions operate indepen­dently. Figures 13 and 14 show the output voltage and
supply current responses of the MAX4123 to a shut­down pulse.

Power Supplies and Layout

The MAX4122–MAX4129 operate from a single +2.7V
to +6.5V power supply, or from dual supplies of ±1.35V
to ±3.25V. For single-supply operation, bypass the
power supply with a 0.1µF ceramic capacitor in parallel
with at least 1µF. For dual supplies, bypass each sup­ply to ground.

Good layout improves performance by decreasing the
amount of stray capacitance at the op amp’s inputs
and outputs. To decrease stray capacitance, minimize
trace lengths and resistor leads by placing external
components close to the op amp’s pins.

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

14 ______________________________________________________________________________________

Pin Configurations

V

EE

IN-

IN+

1

5

V

CC

OUT

MAX4122
MAX4124

SOT23-5

TOP VIEW

2

3

4

14
13
12
11
10

9
8

1
2
3
4
5
6
7

V

CC

OUT2
IN2­IN2+

V

EE

IN1+

IN1-

OUT1

MAX4127

N.C.
SHDN2
N.C.

N.C.

SHDN1

N.C.

SO

14
13
12
11
10

9
8

1
2
3
4
5
6
7

OUT4
IN4­IN4+
V

EE

V

CC

IN1+

IN1-

OUT1

MAX4129

IN3+
IN3­OUT3

OUT2

IN2-

IN2+

SO

IN2-

IN1+

IN2+

V

EE

1

2

8

7

V

CC

OUT2

IN1-

OUT1

MAX4126
MAX4128

SO/µMAX

3

4

6

5

OUT

IN1+

N.C.

V

EE

1

2

8

7

SHDN
V

CC

IN1-

N.C.

MAX4123
MAX4125

SO/µMAX

3

4

6

5

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

______________________________________________________________________________________ 15

__________________________________________________________Chip Topographies

OUT2

IN2-

IN2+

0.066"

(1.676mm)

0.053"

(1.346mm)

VCCSHDN1

SHDN2

VEEV

CC

OUT1

V

CC

IN1-

IN1+

V

EE

SHDN

V

CC

0.055"

(1.397mm)

0.036"

(0.914mm)

OUT

V

EE

IN-

iN+

V

EE

TRANSISTOR COUNT: 170
SUBSTRATE CONNECTED TO V

EE

TRANSISTOR COUNT: 340
SUBSTRATE CONNECTED TO V

EE

MAX4123/
MAX4125

MAX4127/

MAX4128

PART

MAX4124EUK
MAX4125ESA

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5
8 SO

MARKING

INFO.

AABA

—
MAX4125EUA
MAX4126ESA
MAX4126EUA -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 µMAX
8 SO
8 µMAX

—
—

—
MAX4127C/D
MAX4127ESD
MAX4128ESA

-40°C to +85°C

-40°C to +85°C

0°C to +70°C Dice*

14 SO
8 SO

—

—

—
MAX4128EUA
MAX4129ESD

-40°C to +85°C

-40°C to +85°C 8 µMAX
14 SO

—
—

Ordering Information (continued)

*Dice are specified at TA= +25°C, DC parameters only.

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps

________________________________________________________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.

16

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SOT5L.EPS