ADS8509HDB

Analog To Digital Converters (ADC) Overview

The ADS8509HDB is a high-temperature, 16-bit successive approximation register (SAR) analog-to-digital converter from Texas Instruments. It operates at a throughput rate of 250 kSPS and supports extreme temperature environments ranging from -40°C to 175°C. The device features a single-ended input architecture with configurable voltage ranges including ±10 V, ±5 V, ±3.33 V, 10 V, 5 V, and 4 V. Powered by a single 5-V supply, it consumes approximately 87 mW at maximum sampling rates. The component integrates an internal 2.5-V reference and utilizes a serial SPI-compatible interface for data output.

Analog To Digital Converters (ADC) Feature Summary

• Extreme Temperature Operation: Qualified for continuous operation up to 175°C junction temperature.
• High Resolution and Speed: 16-bit resolution with a 250-kHz sampling rate and no missing codes.
• Flexible Input Ranges: Supports ±10 V, ±5 V, ±3.33 V, 10 V, 5 V, and 4 V input ranges via precision resistors.
• Integrated Reference: Includes an internal 2.5-V reference with an external buffer option.

Analog To Digital Converters (ADC) Applications

• Down-hole drilling systems
• High-temperature industrial monitoring
• Harsh environment data acquisition

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix 'HDB' corresponds to the SSOP-28 package and the extended -40°C to 175°C temperature range. Confirm that the application requires the high-temperature variant rather than the standard commercial grade ADS8509. Ensure the design accounts for the thermal resistance characteristics specified in the datasheet for the SSOP-28 package.

Analog To Digital Converters (ADC) Selection Notes

Select this component when operation above 85°C is required. Note that the internal reference may not start correctly beyond the industrial temperature range (-40°C to 85°C); therefore, use an external reference for reliable operation near the upper temperature limit. Verify pin compatibility with legacy ADS7809 or ADS8508 designs if replacing existing hardware.

Analog To Digital Converters (ADC) Part Context

The ADS8509HDB belongs to the ADS8509 family of 16-bit SAR ADCs. The 'H' designation indicates the high-temperature extension to 175°C. It shares the same pinout as the standard ADS8509 but is qualified for more demanding thermal conditions. It is distinct from the ADS8519, which has different internal resistor configurations despite similar pinouts.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS8509 is pin-compatible with the low-speed ADS7809 and the 12-bit ADS8508/7808. However, these are not direct functional replacements due to resolution and speed differences. No other direct P2P substitutes are confirmed in the provided documentation.