AD7829BR-REEL

Overview

The AD7829BR-REEL is an 8-bit, 8-channel sampling 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 3.3 V or 4.5 V to 5.5 V. Key specifications include an integral nonlinearity (INL) and differential nonlinearity (DNL) of ±0.75 LSB max, and a gain error of ±2 LSB max. It 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 with an end-of-conversion pulse.

Feature Summary

• Half-flash ADC architecture providing fast 420 ns conversion times for real-time processing.
• Integrated track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• On-chip 2.5 V reference voltage simplifies external circuit design requirements.
• Automatic power-down mode 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 ordering suffix against the manufacturer's current documentation to confirm package type and reel specifications. Ensure compatibility with system voltage levels and interface logic requirements before integration. Cross-reference the part number with official distributor catalogs to confirm availability and lead times.

Selection Notes

Select this component for applications requiring high-speed, multi-channel data acquisition with low power consumption. The 8-bit resolution and 2 MSPS throughput are suitable for general-purpose signal processing. Consider the VMID pin functionality if input span adjustment is required for single-supply op amp configurations.

Part Context

The AD7829 is part of the AD7822/AD7825/AD7829 family of high-speed, microprocessor-compatible 8-bit ADCs. While the AD7822 offers one channel and the AD7825 offers four channels, the AD7829 provides eight single-ended analog input channels. All variants share the same core half-flash architecture and performance characteristics.

Replacement Considerations

The AD7829BRUZ-1 is listed as a parameter equivalent substitute by distributors. Verify electrical and mechanical compatibility before replacement.

FAQ

How does the AD7829 handle automatic power-down?

The AD7829 combines the convert start and power-down functions at the CONVST pin. At the end of a conversion, if the CONVST pin is logic low, the device automatically enters power-down mode.

What is the function of the VMID pin?

The VMID pin allows the user to offset the input span. This feature can reduce the requirements of single-supply op amps and account for any system offsets by centering the input range anywhere in the range of AGND to VDD.

Can the AD7829 be used in standalone operation?

Yes, the flexible parallel interface includes an EOC (end of conversion) pulse that allows the ADC to be used in a standalone manner without continuous microprocessor intervention.