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MAX4208, MAX4209
Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer

Instrumentation Amplifiers Use Patented Autozero to Achieve 20µV (max) Offset


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 256kB)
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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 patented† 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 in fixed gains of 10V/V, 100V/V, or 1000V/V (suffixed T, H, and K) 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).


MAX4208/MAX4209
2008 Product of the Year Award Winner from the EN-Genius Network
Most Innovative Instrumentation Amplifier

An evaluation kit is available:  MAX4208EVKIT   MAX4209EVKIT  

Key Features   Applications/Uses
  • 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

 
  • 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:  Differential/Instrumentation 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)
    VCMVR
    (V)
    Price
    to Neg. Rail min max typ max max typ typ max 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 VSS-0.1 to VDD-1.3 $1.35 @1k
    MAX4209 
    10
    100
    1000
    $1.35 @1k
    See All Differential/Instrumentation Amplifiers (15)

    US Patent #6,847,257.

    Diagram
    MAX4208, MAX4209: Application Circuit
    Typical Application Circuit

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    Document Ref.: 19-0924; Rev 0; 2007-10-04
    This page last modified: 2009-08-04


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