AD7922ARMZ

Overview

The AD7922ARMZ is a dual-channel, 12-bit successive approximation analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single power supply ranging from 2.35 V to 5.25 V and supports throughput rates up to 1 MSPS. The device features an on-chip track-and-hold amplifier capable of handling input frequencies exceeding 6 MHz. It utilizes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. Power consumption is specified at 4.8 mW typically at 1 MSPS with 3 V supplies and 15.5 mW typically at 1 MSPS with 5 V supplies. The component is housed in an 8-lead MSOP package.

Feature Summary

• Dual-channel architecture with integrated track-and-hold amplifier for high-speed data acquisition
• Flexible serial interface supporting multiple communication protocols including SPI and MICROWIRE
• Low power operation with dedicated standby mode reducing current consumption significantly
• Daisy-chain capability allowing multiple devices to be connected for expanded system monitoring

Applications

• Battery-powered systems such as personal digital assistants
• Medical instruments requiring precise signal conversion
• Mobile communications equipment
• Instrumentation and control systems
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature grade. Ensure compatibility with system voltage requirements between 2.35 V and 5.25 V. Confirm interface protocol support matches the host microprocessor or DSP specifications before integration into the design.

Selection Notes

Select this component when a dual-channel solution with 12-bit resolution and 1 MSPS throughput is required. Consider the MSOP package for space-constrained designs. Evaluate power consumption requirements against the specified typical values at different supply voltages and clock speeds to ensure efficient system operation.

Part Context

This part belongs to the AD7912/AD7922 family of high-speed, low-power ADCs. The AD7922 variant specifically offers 12-bit resolution compared to the 10-bit AD7912. Both share identical pinouts and operational characteristics, differing primarily in resolution and associated accuracy metrics like integral nonlinearity and signal-to-noise ratio.

Replacement Considerations

The AD7912ARMZ serves as a lower-resolution alternative within the same family. Verify that the 10-bit resolution of the AD7912 meets application requirements if substituting. Other members of the AD79xx series may offer different channel counts or interface types but require careful evaluation of pin compatibility and performance specifications.