AD7922ARMZ-REEL7

Overview

The AD7922ARMZ-REEL7 is a dual-channel, 12-bit successive approximation analog-to-digital converter (ADC) 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 typically 4.8 mW at 1 MSPS with 3 V supplies and 15.5 mW 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 signal acquisition
• Flexible serial interface supporting multiple standard protocols including SPI and Microwire
• Low power operation with dedicated standby mode reducing current consumption to 1 µA maximum
• Daisy-chain capability allowing multiple devices to be connected for expanded data reading

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 REEL7 corresponds to the reel packaging format when sourcing components. Confirm that the A Grade temperature range meets the operational requirements of the target environment. Ensure compatibility with the host microprocessor's voltage levels for the serial interface signals before integration into the design.

Selection Notes

Select this component for applications requiring two single-ended analog inputs with 12-bit resolution at speeds up to 1 MSPS. Consider the external reference requirement as the internal reference is derived from VDD. Evaluate the trade-off between throughput rate and power dissipation based on the specific supply voltage used in the system design.

Part Context

This part belongs to the AD7912/AD7922 family of high-speed, low-power ADCs. The AD7922 variant specifically provides 12-bit resolution compared to the 10-bit resolution of the AD7912. Both share identical pinouts and functional characteristics, differing primarily in resolution and associated linearity specifications.

Replacement Considerations

The AD7912ARMZ-REEL7 serves as a direct pin-compatible alternative within the same family, offering 10-bit resolution instead of 12-bit. Verify if the reduced resolution meets the application requirements before substituting.