AD8656ARZ

Overview

The AD8656ARZ is a low noise, precision CMOS dual operational amplifier from Analog Devices. It features DigiTrim technology for high DC accuracy with a maximum offset voltage of 250 µV and drift of 2.3 µV/°C. The device operates on a single supply from 2.7 V to 5.5 V, offering rail-to-rail input and output capabilities. Key electrical parameters include a gain bandwidth product of 28 MHz, slew rate of 11 V/µs, and input voltage noise density of 2.7 nV/√Hz at 10 kHz. It is housed in an 8-lead SOIC package and qualified for automotive applications.

Feature Summary

• Utilizes DigiTrim technology to achieve high DC precision by trimming offset voltage after packaging.
• Provides true rail-to-rail input and output swing capability for wide dynamic range operation.
• Features extremely low input bias current suitable for high impedance signal sources.
• Operates stably as a unity gain buffer without phase reversal.

Applications

• ADC and DAC buffers
• Audio microphone pre-amplifiers
• Industrial process controls
• Precision filters
• Automotive collision avoidance systems

Procurement Notes

Verify the specific ordering suffix to confirm the package type and reel configuration. The 'R' suffix indicates the SOIC package, while 'Z' denotes RoHS compliance. Confirm that the automotive grade variant requires the 'W' prefix if intended for automotive use. Ensure the component matches the required temperature range specifications before procurement.

Selection Notes

Select this component for applications requiring low noise and high precision in single-supply systems. The rail-to-rail I/O makes it suitable for buffering ADCs where full dynamic range is necessary. Consider the 28 MHz bandwidth and 11 V/µs slew rate for fast filter or video applications. Verify compatibility with the system's power supply voltage range between 2.7 V and 5.5 V.

Part Context

The AD8656ARZ is the dual-channel version of the AD8655 series. Both devices share identical electrical characteristics and utilize the same DigiTrim technology. The primary distinction lies in the number of amplifiers per package, with the AD8656 providing two independent channels in an 8-lead footprint. This allows for space-saving designs compared to using two separate single-channel amplifiers.

Replacement Considerations

The AD8655ARZ serves as a functional substitute if only a single channel is required. For dual-channel replacements within the same family, verify pinout compatibility. Automotive applications must use the AD8656W series variants to meet quality requirements.

FAQ

Does the AD8656 exhibit phase reversal?

No, the AD8656 does not exhibit phase reversal for common-mode voltages within the power supply range.

What is the maximum capacitive load the AD8656 can drive?

The AD8656 can drive capacitive loads up to 500 pF without oscillating, though external compensation is recommended for loads greater than 200 pF to minimize ringing.