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MAX4208, MAX4209

Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer

Instrumentation Amplifiers Use Autozero to Achieve 20µV (max) Offset
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Active: In Production.

Description

The MAX4208/MAX4209 ultra-low offset and drift instrumentation amplifiers feature exceptional precision specifications, 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, provides 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 VSS. The MAX4208/MAX4209 are available in space-saving 8-pin µMAX packages and are specified over the automotive operating temperature range (-40°C to +125°C).

Data Sheet

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An evaluation board is available: MAX4208EVKIT MAX4209EVKIT

Key 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
 

Applications/Uses

  • Automotive Transducer Applications
  • Battery-Powered Medical Equipment
  • Differential Voltage Amplification
  • Industrial Process Control
  • Notebook Computers
  • Precision Low-Side Current Sense
  • Strain-Gauge Amplifiers
   

Key Specifications:

Instrumentation/Difference Amplifiers
Part Number Architecture Amps. VCMVR Rail to Rail AV
(V/V)
VSUPPLY (Total)
(V)
VSUPPLY (Total)
(V)
ICC per Amp.
(mA)
ICC per Amp.
(mA)
VOS
(µV)
CMRR @DC
(dB)
PSRR @DC
(dB)
Input IBIAS
(nA)
Unity Gain BW
(MHz)
Slew Rate
(V/µs)
VCMVR
(V)
en
(nV/√Hz)
Noise Spec'd @ Low Pwr. Shutdn Oper. Temp.
(°C)
Budgetary
Price
to Neg. Rail min max typ max max typ typ max typ typ < See Notes
MAX4208  Indirect Current-Feedback 1 Yes Output Only Adj. 2.85 5.5 0.75 1.3 20 135 125 0.01 0.75 0.08 VSS-0.1 to VDD-1.3 140 1kHz Yes -40 to +125 $1.65 @1k
MAX4209 
10
100
1000
$1.62 @1k
See All Instrumentation/Difference Amplifiers (11)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.



Diagram

MAX4208, MAX4209: Application Circuit
Typical Application Circuit

More Information

New Product Press Release   2007-12-20 ]

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Information Index

Document Ref.: 19-0924 Rev 1; 2010-01-12
This page last modified: 2014-04-03