AD977AN

Analog To Digital Converters (ADC) Overview

The AD977AN is a 16-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 5 V supply and dissipates a maximum of 100 mW. The device features a throughput rate of 100 kSPS, distinguishing it from the AD977A variant which supports 200 kSPS. It includes an internal 2.5 V reference and a high-speed serial interface. The ADC accepts bipolar input ranges of ±10 V, ±5 V, or ±3.3 V, and unipolar ranges of 0 V to 10 V, 0 V to 5 V, or 0 V to 4 V. It is housed in a 20-lead skinny DIP package.

Analog To Digital Converters (ADC) Feature Summary

• Factory calibrated switched capacitor architecture minimizes linearity errors
• Single 5 V supply operation with low power consumption
• Integrated internal 2.5 V voltage reference
• High-speed serial data interface for digital output

Analog To Digital Converters (ADC) Applications

• Industrial process control systems requiring high resolution
• Data acquisition systems with moderate sampling rates
• Battery-powered instrumentation due to low power dissipation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'AN' against current manufacturer documentation to confirm package type and temperature range. Ensure compatibility with existing PCB footprints for 20-lead skinny DIP configurations. Check for obsolescence status as older SAR architectures may have limited production availability compared to newer CMOS alternatives.

Analog To Digital Converters (ADC) Selection Notes

Select the AD977AN when a 16-bit resolution is required with a maximum sampling rate of 100 kSPS. Choose this component over the AD977A if lower power consumption at reduced throughput is acceptable. Verify that the input signal range matches the supported bipolar or unipolar specifications without exceeding the absolute maximum ratings.

Analog To Digital Converters (ADC) Part Context

The AD977AN belongs to the AD977 family of 16-bit biCMOS A/D converters. This series is characterized by its combination of high speed and low power consumption. The AD977AN specifically denotes the 100 kSPS version in a plastic DIP package, serving as a cost-effective solution for applications where extreme speed is not critical but high accuracy is required.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements are limited within the same family. The AD977A offers identical functionality with doubled throughput (200 kSPS). Other 16-bit SAR ADCs from different manufacturers may require significant circuit redesign due to differences in reference requirements and serial interface protocols.