AD7822BRUZ-REEL7

Overview

The AD7822BRUZ-REEL7 is an 8-bit, single-channel analog-to-digital converter (ADC) from Analog Devices. It features a half-flash architecture with a maximum throughput of 2 MSPS and a conversion time of 420 ns. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V, supporting input spans of 2 V at 3 V operation and 2.5 V at 5 V operation. Key specifications include ±0.75 LSB integral nonlinearity (INL), ±0.75 LSB differential nonlinearity (DNL), and a signal-to-noise ratio of 48 dB minimum. It integrates a 2.5 V reference, track-and-hold amplifier, and flexible parallel interface.

Feature Summary

• Integrates a high-speed track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz for subsampling applications.
• Features an on-chip 2.5 V reference and VMID pin for adjustable analog input span offsetting.
• Supports automatic power-down at the end of conversion via the CONVST pin logic state sampling.
• Provides a microprocessor-compatible parallel interface with EOC pulse for standalone operation.

Applications

• Data acquisition systems
• DSP front ends
• Disk drives
• Mobile communication systems

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to tape-and-reel packaging when sourcing components. Confirm that the BRUZ variant indicates the industrial temperature range (-40°C to +85°C) and TSSOP-20 package. Ensure compatibility with system voltage requirements, as the device supports both 3 V and 5 V logic levels depending on the VDD supply.

Selection Notes

Select this component for applications requiring a single-channel, high-speed 8-bit ADC with low power consumption. The AD7822 is suitable where channel count is limited to one, unlike the multi-channel AD7825 or AD7829 variants. Consider the integrated reference and track-and-hold capabilities if external buffering or reference circuits are to be minimized in the design.

Part Context

The AD7822 is part of the AD7822/AD7825/AD7829 family of 3 V/5 V, 2 MSPS, 8-bit sampling ADCs. While sharing identical core performance characteristics such as conversion speed and resolution, the AD7822 differs by offering only a single analog input channel. This distinguishes it from the four-channel AD7825 and eight-channel AD7829 within the same product line.

Replacement Considerations

Direct functional replacements within the same family include the AD7825BRUZ-REEL7 (4-channel) and AD7829BRUZ-REEL7 (8-channel), provided additional channels are acceptable. For single-channel needs, verify pinout compatibility if substituting with other single-channel SAR or flash ADCs, noting differences in interface types and power management features.