MAX4209
Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer
Instrumentation Amplifiers Use Autozero to Achieve 20µV (max) Offset
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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).
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
| 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) | $1.70 @1k |
Technical Docs
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The Beauty of Precision Op AmpsDescription
The MAX4208 evaluation kit (EV kit) simplifies evaluation of the MAX4208 ultra-low offset/drift, adjustable gain, precision instrumentation amplifier in a µMAX® package. The MAX4208 features high-impedance differential inputs optimized for small voltages (±100mV max) and provides rail-to-rail output. The MAX4208 EV kit is configured for a gain of 148V/V. The EV kit operates from a single-supply voltage between 2.85V and 5.5V, or dual supplies providing ±1.425V to ±2.75V.
The MAX4208 EV kit can also be used to evaluate the MAX4209 fixed-gain amplifiers. The MAX4208 IC temperature range is -40°C to +125°C.
The MAX4209 EV kit, available separately, evaluates the 100V/V fixed-gain MAX4209 amplifier without external gain-setting resistors.
Note: To evaluate a MAX4209 IC featuring internal gain-setting resistors, order a MAX4209EVKIT+ or request a free sample of the MAX4209 IC along with the MAX4208EVKIT+. See the Part Selection Table in the full data sheet for IC ordering information.
Features
- Single- or Dual-Supply Operation
- 2.85V to 5.5V Single-Supply Operation
- ±1.425V to ±2.75V Dual-Supply Operation
- Adjustable Voltage Gain Configured to 148V/V
- Rail-to-Rail Output
- Configurable Reference Voltage: Externally or Internally Buffered
- Optional Current-Sense Mode
- Fully Assembled and Tested
Description
The MAX4209 evaluation kit (EV kit) simplifies evaluation of the MAX4208 ultra-low offset/drift, fixed gain, precision instrumentation amplifier in a µMAX® package. The MAX4209 features high-impedance differential inputs optimized for small voltages (±100mV max) and provides rail-to-rail output. The MAX4209 EV kit circuit uses the 100V/V fixed-voltage-gain version of the MAX4209. The EV kit operates from a single-supply voltage between 2.85V and 5.5V, or dual supplies providing ±1.425V to ±2.75V.
The MAX4209 EV kit can also evaluate the 10V/V and 1000V/V fixed-gain versions of the MAX4209 amplifiers, as well as the MAX4208 adjustable-gain amplifier. The MAX4209 IC temperature range is -40°C to +125°C.
The MAX4208 EV kit, available separately, evaluates the MAX4208 adjustable-gain amplifier with external gain-setting resistors.
Note: To evaluate a MAX4208 IC featuring externally adjustable gain, order a MAX4208EVKIT+ or request a free sample of the MAX4208AUA+ IC along with the MAX4209EVKIT+. For the alternate-gain versions of the MAX4209 IC, see the Part Selection Table in the full data sheet for IC ordering information.
Features
- Single- or Dual-Supply Operation
- 2.85V to 5.5V Single-Supply Operation
- ±1.425V to ±2.75V Dual-Supply Operation
- 100V/V Fixed Voltage Gain
- Rail-to-Rail Output
- Configurable Reference Voltage: Externally or Internally Buffered
- Optional Current-Sense Mode
- Fully Assembled and Tested
 | SIMULATION MODELS MAX4209 Orcad Library | Download |
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.
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) | $1.70 @1k |
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.
Request a Quote