AD620ANZ Instrumentation Amplifier Specifications and Applications

ElecSuppliers Part Number GuideSep 26, 2026

AD620ANZ is a precision instrumentation amplifier from Analog Devices designed for low-level differential signal amplification. It provides a wide programmable gain range and requires only one external resistor to set the gain.

The AD620 family is designed for applications such as precision data acquisition, transducer interfaces, industrial measurement, medical instrumentation, and portable equipment. AD620ANZ is the 8-lead PDIP version, making it suitable for through-hole PCB assembly and development platforms.

The amplifier combines low input offset voltage, low input bias current, low noise, and high common-mode rejection, allowing small differential signals to be amplified while rejecting unwanted common-mode signals.

AD620ANZ Key Specifications

AD620ANZ provides a gain range from 1 to 10,000. The gain can be programmed using a single external resistor connected between the gain-setting pins.

The device operates from a wide supply range. The AD620 architecture supports dual supplies from ±2.3V to ±18V, while single-supply operation can also be used within the applicable input and output limitations.

AD620 offers low power consumption, with supply current around 1.3 mA maximum under the applicable datasheet conditions. The amplifier provides low input voltage noise and high common-mode rejection, making it suitable for precision signal-conditioning applications.

AD620ANZ uses an 8-lead PDIP package. The complete ordering code should be checked when purchasing because different AD620 variants can have different package and grade specifications.

AD620ANZ Gain Configuration

One of the main features of AD620ANZ is its simple gain configuration.

The gain is determined by an external resistor according to the relationship:

G = 1 + 49.4 kΩ / RG

When no external gain resistor is used, the amplifier operates at a gain of 1. A suitable resistor can be selected when higher gain is required.

This approach allows designers to configure different amplification levels without changing the basic amplifier circuit. It is particularly useful in measurement systems where sensor output levels can vary between applications.

For high-gain applications, resistor accuracy and signal quality should be considered because errors in the gain-setting resistor can directly affect the overall measurement accuracy.

AD620ANZ Common-Mode Rejection

Instrumentation amplifiers are commonly used when the desired signal is a small differential voltage superimposed on a larger common-mode voltage.

AD620 provides high common-mode rejection, allowing the amplifier to reject signals that appear simultaneously on both inputs while amplifying the voltage difference between the two input terminals.

This characteristic is important in applications involving bridge sensors, strain gauges, thermocouples, pressure sensors, and other transducers where interference or common-mode voltage may be present on the signal lines.

The actual common-mode performance depends on gain, frequency, source impedance, PCB layout, and other circuit conditions.

AD620ANZ Input Performance

AD620 is designed for precision low-level signal measurement. The device provides low input offset voltage and low input bias current, which helps reduce errors when processing small sensor signals.

The amplifier also provides high input impedance, reducing the loading effect on signal sources.

These characteristics make AD620ANZ suitable for signal-conditioning circuits where the input signal may only be a few millivolts or less and accurate amplification is required before analog-to-digital conversion or further signal processing.

AD620ANZ Bandwidth and Dynamic Performance

The available bandwidth of an instrumentation amplifier changes with gain. AD620 provides a bandwidth of approximately 120 kHz at a gain of 100 under the specified conditions.

The device also provides a slew rate of approximately 1.2 V/µs.

For high-gain applications, designers should consider the relationship between required gain and available bandwidth. Increasing gain can reduce the usable signal bandwidth, so the amplifier should be selected and configured according to the frequency range of the measurement system.

AD620ANZ Package and Pin Configuration

AD620ANZ uses an 8-lead PDIP package.

The device includes two gain-setting pins, two differential input pins, positive and negative supply pins, a reference pin, and an output pin.

The reference terminal allows the output voltage to be shifted relative to the system reference. This is particularly useful in single-supply circuits where the amplified signal may need to be positioned around a defined reference voltage instead of ground.

The PDIP package is also convenient for prototyping and through-hole assembly, making AD620ANZ commonly suitable for laboratory equipment, evaluation boards, and development projects.

AD620ANZ Applications

AD620ANZ can be used in precision data acquisition systems, weigh scales, transducer interfaces, industrial process controls, medical instrumentation, and battery-powered equipment.

In strain gauge and load cell systems, the amplifier can provide the high-gain differential amplification required to process small bridge output signals.

In pressure and force measurement systems, AD620ANZ can amplify the output of sensors before the signal is passed to an ADC.

In medical instrumentation, the low noise and low input bias current characteristics of the AD620 architecture make it suitable for low-level biopotential signal conditioning, including ECG-related applications.

The device can also be used as a precision preamplifier in portable measurement equipment where low power consumption and compact circuitry are important.

AD620ANZ Design Considerations

When designing an AD620ANZ circuit, the gain, input common-mode voltage, output swing, supply voltage, and required signal bandwidth should be considered together.

The gain-setting resistor should be selected according to the required gain and the desired accuracy. For precision measurement applications, a stable low-tolerance resistor can help reduce gain error.

PCB layout is also important for low-level analog signals. Input traces should be kept away from noisy digital or switching signals, and grounding should be planned to minimize unwanted interference.

When using a single supply, the reference terminal can be used to establish the appropriate output reference level. The input common-mode range and output swing limitations must be checked to ensure that the amplifier remains within its valid operating region.

AD620ANZ Sourcing Considerations

When sourcing AD620ANZ, buyers should confirm the complete manufacturer part number, package type, temperature grade, quantity, and required delivery schedule.

AD620ANZ is the PDIP version, while other AD620 ordering codes use different packages or grades. Therefore, AD620 should not be treated as a complete substitute for AD620ANZ without checking the package and electrical requirements of the original design.

For production procurement, buyers should also verify manufacturer, date code, packaging condition, traceability, and whether the supplied devices match the required ordering code.

AD620ANZ remains a useful option for precision analog signal conditioning where a programmable-gain instrumentation amplifier and through-hole PDIP package are required. Its wide gain range, low input error, high common-mode rejection, and simple external gain configuration make it suitable for measurement and sensor-interface designs.