AD620ARZ - Low Cost Low Power Instrumentation Amplifier | Analog Devices
MPN: AD620ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.44 | $11.44 |
| 10 | $10.5 | $105.00 |
| 100 | $9.2 | $920.00 |
| 500 | $8.1 | $4,050.00 |
| 1,000 | $7.25 | $7,250.00 |
Drop-in alternatives for AD620ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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AD620ARZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Gain Range | 1 to 10000 |
| Supply Voltage Range | ±2.3V to ±18V |
| Supply Current (max) | 1.3 mA |
| Input Offset Voltage (max) | 50 µV |
| Input Bias Current (max) | 1.0 nA |
| CMRR (min) | 100 dB at G=10 |
| Bandwidth | 120 kHz at G=10 |
| Voltage Noise Density | 9 nV/√Hz at 1 kHz |
| Input Impedance | 10 GΩ |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD620ARZ Pin Configuration
| Pin 1 | RG — Gain setting resistor connection |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | -VS — Negative supply |
| Pin 5 | REF — Reference voltage for output level shifting |
| Pin 6 | OUT — Amplifier output |
| Pin 7 | +VS — Positive supply |
| Pin 8 | RG — Gain setting resistor connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD620ARZ is suitable for 6 applications: Medical Instrumentation (ECG/EEG), Industrial Process Control, Data Acquisition Systems, Weigh Scales and Load Cells, Portable and Battery-Powered Devices, Sensor Interfaces.
Medical Instrumentation (ECG/EEG)
The AD620ARZ is ideal for ECG and EEG systems due to its low noise (9 nV/√Hz) and high CMRR (100 dB at G=10). It amplifies small biopotential signals (typically 0.5-5 mV) while rejecting common-mode interference from the body and power lines. Its low supply current (1.3 mA) is crucial for portable and wearable monitors. The gain can be set to 100-1000 to match electrode signals, and the high input impedance (10 GΩ) prevents loading of the electrodes. The device operates from a single 5V supply, simplifying battery-powered designs.
Recommended
Industrial Process Control
In industrial settings, the AD620ARZ is used to condition signals from sensors like strain gauges, pressure transducers, and thermocouples. Its wide supply range (±2.3V to ±18V) allows operation from standard industrial rails. The gain set by a single resistor enables easy calibration for different sensor sensitivities. The high CMRR ensures that 50/60 Hz noise from motors and power lines is rejected, maintaining signal integrity. The device's robustness over -40°C to +85°C makes it suitable for harsh environments. It is often used in PLC analog input modules and process transmitters.
Recommended
Data Acquisition Systems
The AD620ARZ is a key component in data acquisition systems, providing precision amplification before ADC conversion. Its low offset voltage (50 µV) and low drift ensure accurate representation of small signals. The gain range of 1 to 10,000 allows adaptation to various input levels, from microvolt-level thermocouple outputs to volt-level signals. The device's bandwidth of 120 kHz at G=10 is sufficient for many DAQ applications. It can be used in multi-channel systems with multiplexing, and its low power consumption is beneficial for high-channel-count boards. The SOIC package is compact for dense layouts.
Recommended
Weigh Scales and Load Cells
The AD620ARZ is widely used in weigh scale applications to amplify the small differential output of load cells (typically 2 mV/V). Its high CMRR rejects common-mode noise from the excitation supply, and its low input bias current (1 nA) minimizes errors from high-impedance bridges. The gain is set to achieve full-scale output for the ADC. The device's low drift ensures stable readings over temperature. It operates from a single 5V supply, making it compatible with common microcontrollers. The low power consumption is advantageous for battery-operated scales.
Recommended
Portable and Battery-Powered Devices
The AD620ARZ's low supply current (1.3 mA) and wide supply range make it ideal for portable devices such as handheld multimeters, portable gas detectors, and wearable health monitors. It can operate from a single 3V battery (down to ±2.3V dual supply) and provides precision amplification without draining the battery. The small SOIC package is suitable for space-constrained designs. The device's low noise ensures accurate readings in portable instruments. It is often used in conjunction with low-power ADCs and microcontrollers to create energy-efficient systems.
Recommended
Sensor Interfaces
The AD620ARZ is a versatile interface for various sensors, including thermocouples, RTDs, and pressure sensors. Its high input impedance (10 GΩ) prevents loading of high-impedance sensors, and its low bias current (1 nA) minimizes errors. The gain can be adjusted to match the sensor's output range. The device's CMRR is essential for rejecting common-mode noise in industrial environments. It can be used in single-supply applications with proper level shifting. The AD620ARZ is often used in temperature measurement systems and pressure transmitters.
Recommended
Recommended Products Summary
Engineering reference data for AD620ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD620BRZ | AD8221ARZ | INA128UA |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Supply Current (max) | 1.3 mA | 1.3 mA | 0.9 mA | 0.7 mA |
| Input Offset Voltage (max) | 50 µV | 25 µV | 60 µV | 50 µV |
| CMRR (min) | 100 dB at G=10 | 100 dB at G=10 | 100 dB at G=10 | 100 dB at G=10 |
| Bandwidth | 120 kHz at G=10 | 120 kHz at G=10 | 1 MHz at G=1 | 200 kHz at G=10 |
| Voltage Noise Density | 9 nV/√Hz at 1 kHz | 9 nV/√Hz at 1 kHz | 8 nV/√Hz at 1 kHz | 8 nV/√Hz at 1 kHz |
| Input Bias Current (max) | 1.0 nA | 1.0 nA | 0.5 nA | 2.0 nA |
Key Differentiators
- Low supply current of 1.3 mA (vs AD8221ARZ)
- Gain set by single external resistor (vs INA128UA)
- Wide supply range (vs AD8221ARZ)
Design Notes
The AD620ARZ operates from a dual supply of ±2.3V to ±18V or a single supply from 4.6V to 36V. Ensure that the supply voltage is within the specified range to avoid damage. Use 0.1 µF ceramic capacitors close to the supply pins for decoupling. For single-supply operation, the REF pin should be biased to mid-supply to maximize output swing.
For optimal performance, place the gain resistor RG as close to the RG pins (pins 1 and 8) as possible to minimize parasitic capacitance and inductance. Use a precision resistor with low temperature coefficient (e.g., 25 ppm/°C) to maintain gain accuracy. Keep input traces short and shielded to reduce noise pickup. A ground plane under the device is recommended.
Avoid exceeding the absolute maximum supply voltage of ±18V. Also, ensure that the input voltages do not exceed the supply rails. The REF pin should be driven by a low-impedance source to avoid degrading CMRR. When using high gains, be aware of the reduced bandwidth and increased output offset voltage. Always verify the gain setting resistor value using the formula G = 1 + 49.4 kΩ/RG.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free finish.