The MAX4236/MAX4237 are high-precision op amps that feature an exceptionally low offset voltage and offset voltage temperature coefficient without using any chopper techniques. The MAX4236BESA+T and MAX4237 have a typical large-signal, open-loop voltage gain of 120dB. These devices have an ultra-low input-bias current of 1pA. The MAX4236BESA+T is unity-gain stable with a gain-bandwidth product of 1.7MHz, while the MAX4237 is stable for closed-loop gains greater than 5V/V with a gain-bandwidth product of 7.5MHz. Both devices have a shutdown function in which the quiescent current is reduced to less than 0.1μA, and the amplifier output is forced into a high-impedance state. The input common-mode range of the MAX4236/MAX4237 extends below the negative supply range, and the output swings rail-to-rail . These features make the amplifiers ideal for applications with +3V or +5V single power supplies. The MAX4236/MAX4237 are specified for the extended temperature range (-40°C to +85°C) and are available in tiny SOT23, μMAX, and SO packages. For greater accuracy, the A grade μMAX and SO packages are tested to guarantee 20μV (max) offset voltage at +25°C and less then 2μV/°C drift.
Feature
- Ultra-Low Offset Voltage
- 20μV (max) at +25°C (Grade A)
- 50μV (max) at +25°C (Grade B, 6-Pin SOT23)
- Ultra-Low Offset Voltage Drift
- 2μV/°C (max) (Grade A)
- 4.5μV/°C (max) (Grade B, 6-Pin SOT23)
- 5.5μV/°C (max) (6-Pin SOT23)
- Ultra-Low 1pA Input Bias Current
- High Open-Loop Voltage Gain: 110dB (min) (RL = 100kΩ)
- Compatible with +3V and +5V Single-Supply Power Systems
- Ground Sensing: Input Common-Mode Range Includes Negative Rail
- Rail-to-Rail Output Swing into a 1kΩ Load
- 350μA Quiescent Current
- Gain-Bandwidth Product
- 1.7MHz (MAX4236, AV = 1V/V)
- 7.5MHz (MAX4237, AV = 5V/V)
- 200pF Capacitive Load Handling Capability
- Shutdown Mode: 0.1μA Quiescent Current, Places Output in a High-Impedance State
- Available in Space-Saving SOT23 and μMAX Packages
Applications
- Automatic Test Equipment (ATE)
- Battery-Powered Applications
- Cardiac Monitor
- Displays: Industrial, Front Panel, and Instrumentation
- Electrochemical Sensors
- Industrial: Process Measurement and Control
- Instrumentation Amplifiers
- Panel Meters
- Piezoelectric Sensors
- Power Meters
- Programmable Logic Controllers (PLCs)
- Strain Gauges
- Thermocouple Amplifiers
