AD7829BRUZ

Overview

The AD7829BRUZ is an 8-channel, 8-bit analog-to-digital converter (ADC) from Analog Devices Inc., operating at a maximum throughput of 2 MSPS. It utilizes a half-flash architecture with a conversion time of 420 ns and features an on-chip track-and-hold amplifier. The device supports single-ended inputs with spans of 2 V (at 3 V supply) or 2.5 V (at 5 V supply), adjustable via the VMID pin. It includes an internal 2.5 V reference and operates on a single 3 V ± 10% or 5 V ± 10% supply. Key specifications include ±0.75 LSB INL/DNL, SNR of 48 dB min, and power dissipation of 24 mW typical.

Feature Summary

• Integrates an 8-bit half-flash ADC core with a high-speed track-and-hold amplifier for full-scale input frequencies up to 10 MHz.
• Features flexible parallel interface with end-of-conversion pulse support for standalone microprocessor operation.
• Includes automatic power-down functionality triggered by the CONVST pin state after conversion completion.
• Provides channel selection capability without requiring software writes to the device.

Applications

• Data acquisition systems and DSP front ends
• Disk drives
• Mobile communication systems and subsampling applications

Procurement Notes

Verify the specific package variant against the ordering guide, as the AD7829 series is available in 28-lead PDIP, SOIC, and TSSOP configurations. Confirm that the selected suffix matches the required mechanical footprint and thermal characteristics for the target PCB layout. Ensure compatibility with the intended supply voltage range of 3 V or 5 V during component sourcing.

Selection Notes

Select the AD7829BRUZ when eight single-ended channels are required alongside high-speed sampling capabilities. Consider the half-flash architecture for its speed advantage over successive approximation types. Evaluate the need for the internal 2.5 V reference versus an external precision reference based on system noise requirements. Verify that the parallel interface logic levels align with the host microcontroller's I/O standards.

Part Context

The AD7829 is part of the AD7822/AD7825/AD7829 family of high-speed, 8-bit sampling ADCs. While the AD7822 offers one channel and the AD7825 provides four, the AD7829 specifically delivers eight channels within the same 28-pin package form factor. This family shares common architectural features, including the half-flash conversion technique and similar timing characteristics, allowing for scalable design across different channel count requirements.

Replacement Considerations

Direct functional equivalents within the same family include the AD7822 and AD7825, though these offer fewer input channels (one and four, respectively). Designers must account for the difference in multiplexer address pins and pinout variations when substituting these parts. No other cross-manufacturer replacements are confirmed in the provided documentation.