ADS7811U-1/1K

Analog To Digital Converters (ADC) Overview

The ADS7811U-1/1K is a 16-bit CMOS analog-to-digital converter featuring a 250kHz throughput rate. It integrates a capacitor-based successive approximation register (SAR) architecture with an inherent sample-and-hold circuit, a precision reference, and an internal clock. The device operates on dual ±5V supplies, providing a ±2.5V input range. Key electrical specifications include a minimum spurious-free dynamic range of 96dB at a 100kHz input frequency, a signal-to-noise plus distortion ratio of 84dB, and a typical full-scale error of ±0.5%. It utilizes parallel binary two's complement data output.

Analog To Digital Converters (ADC) Feature Summary

• Integrates a complete 16-bit sampling ADC system including a high-speed sample-and-hold circuit, precision voltage reference, and internal clock generator to minimize external component requirements.
• Delivers excellent AC performance with a spurious-free dynamic range exceeding 96dB and a usable bandwidth up to 1MHz for precision signal acquisition.
• Features a 28-lead SOIC package designed for industrial temperature operation, supporting direct interfacing with microprocessors via parallel data buses.

Analog To Digital Converters (ADC) Applications

• Wireless base stations
• Spectrum analysis equipment
• Imaging systems
• Data acquisition systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm packaging type and material compliance. Confirm that the requested quantity aligns with the standard shipping carrier specifications defined in the official documentation. Ensure all technical parameters match the design requirements before finalizing the purchase order.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 16-bit resolution and 250kHz sampling speed are required within a single-chip solution. The integrated reference and clock simplify board layout compared to discrete architectures. Ensure the application can accommodate the necessary ±5V power supply rails and provides adequate drive capability for the parallel digital interface.

Analog To Digital Converters (ADC) Part Context

This device belongs to the ADS7811 family of high-performance analog-to-digital converters manufactured by Texas Instruments. It represents a specialized class of CMOS SAR converters designed for applications demanding high linearity and wide dynamic range without the complexity of multi-channel simultaneous sampling architectures.

Analog To Digital Converters (ADC) Replacement Considerations

Consult the official datasheet for listed similar part numbers such as the ADS7813 or ADS7815. Verify pin compatibility and electrical specifications before substitution, as interface timing and resolution may differ across the product family.

Analog To Digital Converters (ADC) FAQ

What is the recommended method for starting a conversion using the R/C and CS pins?

To initiate a conversion, take the R/C pin LOW at least 100ns before taking the CS pin LOW. Both signals should be returned HIGH during the early part of the conversion cycle to prevent noise coupling onto the hold capacitor.

How does the ADS7811 handle digital output during the conversion process?

During the conversion cycle, the digital outputs (D15 through D0) enter a high-impedance state. They become active again near the end of the conversion, allowing the result to be latched upon the rising edge of the BUSY signal.

Can an external reference voltage be used instead of the internal reference?

Yes, an external reference can be applied to the REF pin to bypass the internal reference. However, the device specifications are only guaranteed when the internal reference is utilized.