MAX4209HAUA+ Datasheet MAX4209HAUA+T, MAX4208AUA+T, MAX4209HAUA+ | P1-P3

General Description

The MAX4208/MAX4209 ultra-low offset and drift instru-

mentation amplifiers feature exceptional precision specifi-

cations, low power consumption, rail-to-rail output,

excellent gain-bandwidth product, and buffered

REFIN/MODE input in a very small µMAX

package.

These devices use a spread-spectrum, autozeroing

technique that constantly measures and corrects the

input offset, eliminating drift over time and temperature and

the effect of 1/f noise. This technique achieves less than

20µV offset voltage, allows ground-sensing capability, pro-

vides ultra-low CMOS input bias current and increased

common-mode rejection performance.

The MAX4208/MAX4209 provide high-impedance inputs

optimized for small-signal differential voltages (±100mV).

All devices provide a gain-bandwidth product of 750kHz.

The MAX4208 provides an adjustable gain with two

external resistors or unity gain with FB connected to OUT.

The MAX4209 is available with a fixed gain of 100V/V with

±0.03% (typ) accuracy. Both devices include a reference

input (REF) to level-shift the output, allowing for bipolar

signals in single-supply applications. In both devices,

REFIN/MODE is an input to a precision unity-gain buffer,

which sets the REF voltage to level-shift the output. The

internal REF buffer allows the reference to be set by a

simple resistive divider or an ADC reference without any

loading error.

The MAX4208/MAX4209 operate with a 2.85V to 5.5V

single-supply voltage and consume only 750µA

of quiescent current (when the internal buffer is off) and

only 1.4µA in shutdown mode. These amplifiers

also operate with ±2.5V dual supplies with REF

connected to ground and REFIN/MODE to V

The MAX4208/MAX4209 are available in space-saving

8-pin µMAX packages and are specified over the auto-

motive operating temperature range (-40°C to +125°C).

Applications

Automotive Transducer Applications

Strain-Gauge Amplifiers

Industrial Process Control

Battery-Powered Medical Equipment

Precision Low-Side Current Sense

Notebook Computers

Differential Voltage Amplification

Features

♦ Ultra-Low Input Offset Voltage

±20µV (max) at +25°C

♦ ±0.25% (max) Gain Error

♦ Low 0.2µV/°C Offset Voltage Drift

♦ 1pA CMOS Input Bias Current

♦ True Ground Sensing with Rail-to-Rail Output

♦ Buffered REF Input for High Accuracy and

Bipolar Operation

♦ 2.85V to 5.5V Single-Supply Operation

(or ±1.425V to ±2.75V Dual Supplies)

♦ 750µA Supply Current

♦ 1.4µA Shutdown Mode

♦ 750kHz Gain-Bandwidth Product

♦ Operate Over the -40°C to +125°C Automotive

Temperature Range

♦ Tiny 8-Pin µMAX Package

Note: All 8-pin µMAX packages have package code U8-1.

+Denotes a lead(Pb)-free/RoHS-compliant package.

MAX4208/MAX4209

Ultra-Low Offset/Drift, Precision

Instrumentation Amplifiers with REF Buffer

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0924; Rev 1; 4/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-

PACKAGE

GAIN

(V/V)

MAX4208AUA+T -40°C to +125°C 8 µMAX ADJ

MAX4209HAUA+T -40°C to +125°C 8 µMAX 100

µMAX is a registered trademark of Maxim Integrated Products, Inc.

IN-

IN+

REFIN/MODE

REF

MAX4208

OUT

REF

G = 1 +

BUFFER OUT =

Typical Application Circuit

MAX4208/MAX4209

Ultra-Low Offset/Drift, Precision

Instrumentation Amplifiers with REF Buffer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= 5V, V

= 0V, V

= V

REF

= V

/2, V

REFIN/MODE

= V

, R

= 100kΩ to V

/2, V

DIFF

= (V

IN+

- V

IN-

) = 0V, MAX4208 set for

G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), T

= +25°C, unless otherwise noted.) (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.

to V

...............................................................-0.3V to +6V

All Other Pins ...................................(V

- 0.3V) to (V

+ 0.3V)

OUT Short-Circuit Duration .......................................Continuous

Current Into OUT, V

, and V

.......................................±25mA

Current Into Any Other Pin................................................±20mA

Continuous Power Dissipation (T

= +70°C)

8-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW

Operating Temperature Range .........................-40°C to +125°C

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

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

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

INPUT DC CHARACTERISTICS

MAX4208, G = 100V/V ±3 ±20

Input Offset Voltage V

MAX4209H, G = 100V/V ±3 ±20

µV

Input Bias Current I

-100mV ≤ V

DIFF

≤ +100mV (Note 3) 1 pA

Input Offset Current I

-100mV ≤ V

DIFF

≤ +100mV (Note 3) 1 pA

Differential mode 2

Input Resistance R

= V

Common mode 2

GΩ

-20mV ≤ V

DIFF

≤ +20mV

MAX4208, G = 100V/V

0.05 ±0.25

Gain Error

-20mV ≤ V

DIFF

≤ +20mV

MAX4209H, G = 100V/V

0.05 ±0.25

MAX4208, G = 100V/V 25 150

Gain Nonlinearity

(Note 2)

MAX4209H, G = 100V/V 25 150

ppm

Input Common-Mode Range V

Guaranteed by CMRR test

0.1

1.30

Input Common-Mode Rejection

Ratio

CMRR V

= (V

- 0.1V) to (V

- 1.30V) 106 135 dB

MAX4208/MAX4209

Ultra-Low Offset/Drift, Precision

Instrumentation Amplifiers with REF Buffer

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= 5V, V

= 0V, V

= V

REF

= V

/2, V

REFIN/MODE

= V

, R

= 100kΩ to V

/2, V

DIFF

= (V

IN+

- V

IN-

) = 0V, MAX4208 set for

G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), T

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Rejection Ratio PSRR

= 2.85V to 5.5V, V

REF

= V

+ 0.5V)

100 125 dB

REFIN/MODE AND REF DC CHARACTERISTICS

REFIN/MODE Buffer Input Offset

Voltage

(Note 2) ±10 ±40 µV

REFIN/MODE Input-Voltage Low V

Reference buffer is OFF V

SS +

0.05

REFIN/MODE Input-Voltage High V

Shutdown mode

DD -

0.2

REFIN/MODE Buffered Reference

Input Range

RE F IN /M OD E

Reference buffer is ON, guaranteed by

REFIN/MODE CMRR test

SS +

0.2

DD -

1.3

REFIN/MODE Buffer

Common-Mode Rejection Ratio

+ 0.2V) ≤ V

REF/MODE

≤ (V

- 1.3V)

(Note 2)

106 135 dB

REFIN/MODE Buffer

Power-Supply Rejection Ratio

= 2.85V to 5.5V, V

REF/MODE

= V

+ 0.5V)

100 125 dB

REFIN/MODE Bias Current I

REFIN

< V

REFIN/MODE

< V

(Note 3) 1 pA

REF Common-Mode Range

Guaranteed by reference CMRR test

(Note 4)

1.30

REF Common-Mode Rejection

Ratio

≤ V

REF

≤ (V

- 1.30V)

(Note 4)

106 135 dB

REF, FB Bias Current MAX4208 (Note 3) 1 pA

DIFF

= 0V (Note 5) ±10 nA

REF Input Current (MAX4209) I

REF

DIFF

= ±100mV (Note 5) ±100 µA

OUTPUT DC CHARACTERISTICS

= 100kΩ 30 45

= 10kΩ 50 70V

- V

OUT

= 1kΩ 250 325

= 100kΩ 30 40

= 10kΩ 50 65

Output-Voltage Swing

(Notes 6 and 7)

OUT

- V

= 1kΩ 250 285

Source +20

Short-Circuit Current I

Sink -25

Short-Circuit Recovery Time 0.50 ms

AC CHARACTERISTICS

Gain-Bandwidth Product GBW MAX4208, G = 1V/V 750 kHz

Small-Signal Bandwidth BW MAX4209H, G =100V/V 7.5 kHz

Slew Rate (Note 8) SR MAX4208, G = 1V/V, V

OUT

= 100mV step 80 V/ms

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MAX4209HAUA+

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Instrumentation Amplifiers Low Offset/Drift Instrumentation Amp

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MAX4209HAUA+

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