ADS7817U/2K5

Analog To Digital Converters (ADC) Overview

The ADS7817U/2K5 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 to define the input span. Communication is handled via a synchronous 3-wire serial interface compatible with SPI. The component is housed in an SOIC-8 package and is specified for operation within a 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 of 2.3mW at full speed
• External reference input range of 100mV to 2.5V

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify that the ordering suffix /2K5 corresponds to the tape and reel packaging containing 2500 devices per reel. Confirm the specific linearity grade required, as the base model ADS7817U specifies ±2 LSB integral and differential linearity errors. Ensure the design accommodates the SOIC-8 surface mount package dimensions and thermal requirements for the specified operating temperature range.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a differential input is required for noise rejection in low-power applications. The external reference capability allows flexibility in setting input ranges from 100mV to 2.5V. Note that the standard ADS7817U has ±2 LSB linearity; if tighter accuracy is needed, consider the ADS7817UB or ADS7817UC variants which offer ±1 LSB and ±0.75 LSB errors respectively. Ensure the system clock can support up to 3.2MHz for optimal power down cycling.

Analog To Digital Converters (ADC) Part Context

The ADS7817U/2K5 belongs to the ADS7817 family of micro power sampling ADCs. It shares architectural similarities with the ADS7822 but differs in input type, supporting true differential inputs rather than pseudo-differential or single-ended configurations. The U suffix denotes the SOIC-8 plastic package, while the /2K5 indicates the specific tape and reel quantity for automated assembly.

Analog To Digital Converters (ADC) Replacement Considerations

ADS7817UB/2K5 offers improved linearity specifications (±1 LSB INL/DNL) in the same SOIC-8 package. ADS7817EC/2K5 provides higher precision (±0.75 LSB) in a VSSOP-8 package. ADS7822U is a pin-compatible alternative but supports only pseudo-differential/single-ended inputs.