MAX4209
Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer
Instrumentation Amplifiers Use Autozero to Achieve 20µV (max) Offset
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Key Features
Applications/Uses
| Architecture | Indirect Current-Feedback |
| # Amplifiers | 1 |
| VCMVR (to Neg. Rail) | Yes |
| Rail to Rail | Output Only |
| AV (V/V) | 10 100 1000 |
| ICC per Amp. (mA) (typ) | 0.75 |
| VOS (µV) (max) | 20 |
| CMRR @DC (dB) (typ) | 135 |
| PSRR @DC (dB) (typ) | 125 |
| Input IBIAS (nA) (max) | 0.01 |
| Unity Gain BW (MHz) (typ) | 0.75 |
| Oper. Temp. (°C) | -40 to +125 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 1.93 |
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Technical Docs
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Parameters
| Architecture | Indirect Current-Feedback |
| # Amplifiers | 1 |
| VCMVR (to Neg. Rail) | Yes |
| Rail to Rail | Output Only |
| AV (V/V) | 10 100 1000 |
| ICC per Amp. (mA) (typ) | 0.75 |
| VOS (µV) (max) | 20 |
| CMRR @DC (dB) (typ) | 135 |
| PSRR @DC (dB) (typ) | 125 |
| Input IBIAS (nA) (max) | 0.01 |
| Unity Gain BW (MHz) (typ) | 0.75 |
| Oper. Temp. (°C) | -40 to +125 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 1.93 |
Key Features
- Spread-Spectrum, Auto-Zero Instrumentation Amplifiers Improve DC Characteristics to Maximize Sensor Performance
- 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
- 750kHz Gain-Bandwidth Product
- Buffered REF Input for High Accuracy and Bipolar Operation
- Low Power Operation Supports Remote Sensing and Battery-Powered Applications
- 2.85V to 5.5V Single-Supply Operation (or ±1.425V to ±2.75V Dual Supplies)
- 750µA Supply Current
- 1.4µA Shutdown Mode
- Adjustable (MAX4208) and Fixed Gain of 100 (MAX4209) Provide Design Flexibility
Applications/Uses
- Battery-Powered Medical Equipment
- Differential Voltage Amplification
- Industrial Process Control
- Notebook Computers
- Precision Low-Side Current Sense
- Strain-Gauge Amplifiers
Description
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).
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
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