ADS8664IDBT

Analog To Digital Converters (ADC) Overview

The ADS8664IDBT is a 12-bit, 4-channel successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. It operates with a maximum sampling rate of 500 kSPS and features an internal 4.096 V reference voltage source. The device supports single-ended inputs with programmable ranges including ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, and ±0.64 V, as well as unipolar ranges from 0 V to 10.24 V. It utilizes a SPI-compatible serial interface and functions within an analog supply range of 4.75 V to 5.25 V and a digital supply range of 1.65 V to 5.25 V. Key performance metrics include a signal-to-noise ratio of 73.85 dB, differential nonlinearity of 0.5 LSB, and integral nonlinearity of 0.5 LSB. The component is housed in a TSSOP-38 package and operates between -40°C and +125°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrated analog front-end circuitry with over-voltage protection up to ±20 V on all input channels.
• Programmable gain amplifier and multiplexer supporting independent channel configuration for various bipolar and unipolar input ranges.
• Daisy-chainable architecture allowing multiple devices to be connected via a single SPI interface.
• Internal low-drift voltage reference source eliminating the need for external precision references.

Analog To Digital Converters (ADC) Applications

• Industrial process control systems requiring high-accuracy multi-channel data acquisition.
• Programmable logic controller (PLC) analog input modules.
• Power automation equipment and smart grid monitoring devices.
• Medical instrumentation requiring isolated or protected signal conditioning.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix IDBT corresponds to the tube packaging format when ordering. Confirm that the required input voltage levels match the specified analog and digital supply ranges. Ensure the design accounts for the thermal characteristics associated with the TSSOP-38 package under maximum operating conditions. Cross-reference the latest datasheet revision to confirm pinout compatibility and any updated electrical specifications before finalizing procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this component when four single-ended channels with wide input voltage ranges are required. The integrated PGA and over-voltage protection simplify front-end design compared to discrete solutions. Consider the ADS8668 if eight channels are needed instead of four. Evaluate the 12-bit resolution against application accuracy requirements, noting that higher resolution options exist in the family but may offer lower throughput.

Analog To Digital Converters (ADC) Part Context

The ADS8664 belongs to the ADS866x family of high-speed, multi-channel SAR ADCs designed for industrial applications. It shares architectural similarities with the ADS8668, differing primarily in channel count. This series emphasizes integration by combining the ADC, multiplexer, PGA, and reference into a single monolithic device, reducing board space and component count for complex data acquisition systems.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS8668IDBT serves as a direct functional substitute for designs requiring eight channels instead of four, maintaining identical pinouts and specifications. Other members of the ADS866x family may require schematic and firmware modifications due to differences in channel count or interface configurations.