AD7829BRU

Overview

The AD7829BRU is an 8-bit, 8-channel analog-to-digital converter (ADC) from Analog Devices Inc., featuring a half-flash architecture and a maximum throughput of 2 MSPS. It operates on a single supply voltage ranging from 2.7 V to 3.3 V or 4.5 V to 5.5 V. The device includes 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, integral nonlinearity (INL) of ±0.75 LSB, differential nonlinearity (DNL) of ±0.75 LSB, and a gain error of ±2 LSB. Power consumption is typically 24 mW in normal operation and drops to 5 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 2% tolerance to simplify external circuit design.
• Automatic power-down at the end of conversion to minimize power consumption.

Applications

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

Procurement Notes

Verify the specific package variant when ordering, as the base model number may correspond to different physical packages such as TSSOP-28 or SOIC-28. Confirm that the required channel count matches the AD7829 specification of eight channels. Ensure the selected component meets the industrial temperature range requirements if operating outside standard conditions. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Selection Notes

Select this component for applications requiring high-speed sampling with moderate resolution. The 8-channel multiplexer allows multiple single-ended inputs without external switching logic. Consider the VMID pin functionality if input signal offsets need adjustment. Evaluate the parallel interface requirements against the target microprocessor or DSP capabilities. Verify that the power supply rails align with the specified 3 V or 5 V operational ranges for optimal performance.

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 channels, the AD7829 specifically supports eight single-ended analog input channels. All variants share the same core half-flash architecture, conversion speed, and power management features, differing primarily in channel count and package pin configurations.

Replacement Considerations

The AD7829BRUZ-1 is listed as a parameter-equivalent alternative by distributors. Verify pinout and electrical specifications before substitution. No other direct replacements are confirmed in the provided documentation.