ADS7817U

Analog To Digital Converters (ADC) Overview

The ADS7817U is a 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. It features a high-impedance fully differential analog input and operates with a single +5V supply, consuming 2.3mW at a 200kHz sampling rate. The device utilizes an external reference voltage ranging from 100mV to 2.5V, which sets the input span. It communicates via a synchronous 3-wire serial interface compatible with SPI. The ADS7817U is housed in an SOIC-8 package and supports an operating temperature range of -40°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 200kHz throughput rate
• Fully differential bipolar input architecture
• Micro power consumption: 2.3mW active, 3µA max shutdown
• External reference input range: 100mV to 2.5V

Analog To Digital Converters (ADC) Applications

• Battery operated systems
• Remote data acquisition
• Isolated data acquisition
• AC motor control
• Transducer interface

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific performance grade required for the application. The standard ADS7817U has ±2 LSB integral and differential linearity errors. Higher precision variants such as the ADS7817UB (±1 LSB DNL) or ADS7817UC (±1 LSB INL) are available in the same SOIC-8 package. Confirm that the ordering suffix matches the desired accuracy specifications before procurement.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7817U when a low-power, 12-bit ADC with differential inputs is required. Ensure the system can provide an external reference voltage between 100mV and 2.5V, as no internal reference exists. The device requires a clock frequency up to 3.2MHz for maximum throughput. Consider the ADS7817B or C grades if tighter linearity specifications than the standard U grade are necessary.

Analog To Digital Converters (ADC) Part Context

The ADS7817U belongs to the ADS7817 family of micro-power sampling ADCs from Texas Instruments. This family includes variants with different packages (PDIP-8, MSOP-8) and performance grades (Standard, B, C). The 'U' suffix specifically denotes the SOIC-8 surface-mount package. All variants share the same core SAR architecture and electrical characteristics, differing primarily in manufacturing tolerance and packaging.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same package include other grades of the ADS7817 family, such as ADS7817UB or ADS7817UC, which offer improved linearity. For applications requiring higher resolution or different input types, consider the ADS7813 (16-bit single-ended) or ADS7817E (MSOP-8 package). Verify that any substitute maintains the 200kHz sampling rate and differential input capability.