AD7922ARMZ-REEL

Overview

The AD7922ARMZ-REEL is a dual-channel, 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.35 V to 5.25 V supply and supports throughput rates up to 1 MSPS. The device features an internal track-and-hold amplifier with a wide input bandwidth capable of handling frequencies exceeding 6 MHz. It utilizes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. Key performance metrics include a typical Signal-to-Noise Ratio (SNR) of 72.5 dB at 100 kHz input frequency and a maximum power dissipation of 20 mW at 5 V supplies during operation.

Feature Summary

• Dual-channel architecture with integrated multiplexer for sequential single-ended signal acquisition
• Low-power design featuring full power-down mode with minimal current consumption
• Daisy-chain capability allowing multiple devices to be connected for expanded data acquisition
• No pipeline delay structure ensuring accurate control of sampling instants via chip select

Applications

• Battery-powered personal digital assistants and mobile communication systems
• Medical instrumentation requiring low power and high accuracy
• Data acquisition systems in industrial instrumentation and control environments
• High-speed modem interfaces and optical sensor signal processing

Procurement Notes

Verify the specific package variant against the ordering suffix. The 'ARMZ' designation indicates the MSOP-8 package, while other suffixes may correspond to the TSOT-8 package. Confirm that the REEL packaging matches the required manufacturing quantity. Ensure the component grade meets the specified temperature range requirements for the target application environment.

Selection Notes

Select this component when a 12-bit resolution is required alongside a 1 MSPS sampling rate. It is suitable for applications needing a single-supply operation between 2.35 V and 5.25 V without an external reference voltage. Consider the MSOP-8 package if space constraints favor this footprint over the TSOT-8 option. Evaluate the power consumption trade-offs between normal operation and power-down modes based on system duty cycles.

Part Context

This part belongs to the AD7912/AD7922 family of high-speed, low-power ADCs. The AD7922 specifically provides 12-bit resolution, whereas the AD7912 offers 10-bit resolution within the same functional framework. Both share identical pinouts, serial interfaces, and power management features, differing primarily in conversion precision and associated dynamic performance specifications.

Replacement Considerations

The AD7912ARMZ-REEL serves as a lower-resolution alternative within the same series. Verify compatibility regarding resolution requirements and ensure that the pinout remains identical across package variants within the AD7912/AD7922 family before substitution.