AD7921ARMZ-REEL

Overview

The AD7921ARMZ-REEL is a dual-channel, 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single supply voltage ranging from 2.35 V to 5.25 V and supports throughput rates up to 250 kSPS. The device features an internal track-and-hold amplifier with a wide input bandwidth capable of handling frequencies exceeding 6 MHz. Power consumption is typically 4 mW at 250 kSPS with 3 V supplies and 13.5 mW with 5 V supplies. The part includes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, along with a standby mode drawing a maximum of 1 μA.

Feature Summary

• Dual-channel architecture with on-chip multiplexing for sequential conversion
• Internal reference derived directly from the power supply rail
• Flexible power management with low-power standby modes
• Standard serial interface supporting multiple communication protocols

Applications

• Battery-powered personal digital assistants and mobile communications devices
• Medical instruments requiring low power consumption
• Instrumentation and control systems
• Data acquisition systems and high-speed modems

Procurement Notes

Verify that the ordering suffix matches the required package type, as the base model may be available in different configurations. Confirm RoHS compliance status through official documentation before integration. Ensure the specific reel quantity aligns with manufacturing requirements. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical specifications remain unchanged.

Selection Notes

Select this component when a dual-channel solution is required within a compact footprint. The internal reference simplifies design by eliminating external components but ties the input range to the supply voltage. Verify that the system clock frequency supports the desired throughput rate without violating timing constraints. Consider the MSOP or TSOT package availability based on board space limitations.

Part Context

This component belongs to the AD7911/AD7921 family of high-speed, low-power ADCs. The AD7921 variant specifically offers 12-bit resolution compared to the 10-bit AD7911. Both share identical pinouts and functional characteristics, differing primarily in resolution and associated dynamic performance metrics such as signal-to-noise ratio.

Replacement Considerations

The AD7911ARMZ-REEL serves as a direct pin-compatible alternative offering 10-bit resolution. Other members of the AD79xx series may require schematic modifications due to differing pinouts or voltage ranges.