AD7922AUJZ-REEL7

Overview

The AD7922AUJZ-REEL7 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 on-chip track-and-hold amplifier capable of handling input frequencies exceeding 6 MHz. Key electrical specifications include a typical signal-to-noise ratio (SNR) of 72.5 dB at a 100 kHz input frequency, maximum integral nonlinearity of ±1.5 LSB, and differential nonlinearity ranging from -0.9 to +1.5 LSB. Power consumption reaches approximately 15.5 mW at 1 MSPS with a 5 V supply, while standby current is limited to 1 µA maximum.

Feature Summary

• Dual-channel architecture with internal multiplexing for sequential single-ended conversions
• Flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols
• Daisy-chain capability allowing multiple devices to be read simultaneously
• Integrated power-down mode reducing current consumption to typically 50 nA

Applications

• Battery-powered personal digital assistants and mobile communications equipment
• Medical instruments requiring low-power data acquisition
• Instrumentation and control systems utilizing high-speed modems or optical sensors

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to the reel packaging format required for automated assembly processes. Confirm that the A Grade temperature range meets the operational requirements for the intended environment. Ensure compatibility with the host microcontroller's voltage levels and clock speeds before finalizing procurement orders.

Selection Notes

Select this component when a 12-bit resolution is necessary for applications demanding high dynamic performance and low power consumption. The external reference design requires careful consideration of the supply voltage stability, as the ADC utilizes VDD as its internal reference. Evaluate the trade-off between throughput rate and power dissipation if operating below the maximum 1 MSPS speed.

Part Context

This part belongs to the AD7912/AD7922 family of high-speed, low-power ADCs. While functionally similar to the AD7912, it provides 12-bit resolution compared to the 10-bit variant. Both share identical pinouts, package options, and interface protocols, facilitating direct interchangeability in designs where resolution requirements may vary.

Replacement Considerations

The AD7912AUJZ-REEL7 serves as a lower-resolution alternative within the same package and family. Verify that the 10-bit resolution of the AD7912 meets system accuracy requirements before substitution.