ADS821U-1

Analog To Digital Converters (ADC) Overview

The ADS821U-1 is a monolithic 10-bit, 40MHz sampling Analog-to-Digital Converter (ADC) manufactured by Texas Instruments. It utilizes a small geometry CMOS process and features a pipeline architecture with digital error correction to ensure no missing codes. The device includes an internal track-and-hold circuit, reference, and power-down feature. It operates from a single +5V supply and accepts differential or single-ended input signals. Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 58dB at 12MHz input frequency, a full-power analog input bandwidth of 6.5MHz, and a maximum power consumption of 450mW. The component is housed in an SO-28 package.

Analog To Digital Converters (ADC) Feature Summary

• 10-bit resolution with 40MHz sampling rate
• Internal track-and-hold and reference circuits
• Digital error correction for no missing codes
• Low power consumption: 380mW typical

Analog To Digital Converters (ADC) Applications

• Video digitizing
• Ultrasound imaging
• Gamma cameras
• Set-top boxes
• Cable modems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix '-1' against the official datasheet. The provided documentation lists 'ADS821U' (Rails) and 'ADS821U/1K' (Tape and Reel). Confirm if '-1' denotes a specific temperature grade, packaging variant, or revision not explicitly detailed in the standard part number structure. Ensure compatibility with the specified SO-28 package dimensions.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high-speed 10-bit conversion with low distortion. It supports both differential and single-ended inputs via configurable common-mode voltage. Consider the 6.5 clock cycle data latency when designing timing interfaces. The device requires a single +5V supply and TTL/HCT compatible logic levels for digital outputs.

Analog To Digital Converters (ADC) Part Context

The ADS821U is part of the ADS821 family of high-speed ADCs. It is designed for demanding imaging and telecommunications applications where high SNR and oversampling capability are critical. The device replaces older discrete solutions by integrating the quantizer, T&H, and reference into a single monolithic chip.

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements should be sought within the ADS821 family or similar 10-bit, 40MHz pipeline ADCs. Verify pin compatibility and software/hardware interface requirements. Note that the ADS821U/1K is available in tape and reel format, which may affect handling but not function.

Analog To Digital Converters (ADC) FAQ

What is the data latency of the ADS821U?

The ADS821U has a data latency of 6.5 convert clock cycles from the start convert signal to valid output data.

Can the ADS821U accept single-ended inputs?

Yes, the ADS821U can be configured to accept either differential or single-ended input signals by tying the complementary input to the common-mode reference voltage.

What is the typical SNR at a 12MHz input frequency?

At an input frequency of 12MHz and -1dBFS input level, the typical Signal-to-Noise Ratio (SNR) is 58dB.