AD7829BRU-1

Overview

The AD7829BRU-1 is an 8-bit, 8-channel analog-to-digital converter with a maximum throughput of 2 MSPS. It utilizes a half-flash architecture and operates from a single 3 V ± 10% or 5 V ± 10% supply. The device features an on-chip 2.5 V reference, a track-and-hold amplifier with a full power bandwidth up to 10 MHz, and a flexible parallel interface. Key performance metrics include a conversion time of 420 ns, an SNR of 48 dB min at 30 kHz input frequency, and INL/DNL of ±0.75 LSB max. Power consumption is typically 24 mW in normal operation and drops to 0.2 μA in power-down mode.

Feature Summary

• Half-flash ADC architecture providing fast 420 ns conversion times for real-time DSP processing.
• On-chip track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• Integrated 2.5 V reference voltage with external reference capability via the VREF pin.
• Automatic power-down functionality triggered by the CONVST pin state at the end of conversion.

Applications

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

Procurement Notes

Verify the specific package variant (SOIC_W or TSSOP) required for the design, as the base part number covers both. Confirm that the B-grade temperature range (-40°C to +85°C) meets the application requirements. Ensure the ordering suffix matches the desired packaging format, such as tube or reel, when placing orders with distributors.

Selection Notes

Select this component for applications requiring high-speed sampling with low power consumption. The VMID pin allows for input span adjustment, which is useful for offset correction or bipolar signal handling. Consider the parallel interface complexity versus serial alternatives if microprocessor pins are limited. The 8-channel multiplexer simplifies system design by eliminating external muxes for multi-point sensing.

Part Context

The AD7829-1 is part of the AD7829 family of high-speed, 8-bit ADCs from Analog Devices. It shares architectural similarities with the AD7822 (1 channel) and AD7825 (4 channels), offering scalable channel counts while maintaining consistent performance characteristics like the 2 MSPS throughput and half-flash conversion technique across the series.

Replacement Considerations

Direct substitutes within the same family include the AD7825BRUZ (4-channel) and AD7822BRUZ (1-channel) if fewer inputs are sufficient. For higher resolution needs, consider the AD7865 or AD7866 series. Verify pin compatibility and software interface logic when migrating to different ADC families.