ADS8681IPW

Analog To Digital Converters (ADC) Overview

The Texas Instruments ADS8681IPW is a 16-bit Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC) integrated into a complete data acquisition system. Operating at a throughput of 1 MSPS, it features an integrated analog front-end (AFE) input driver and overvoltage protection up to ±20 V. The device includes a low-drift on-chip 4.096 V reference and operates from a single 5 V analog supply with 1.65 V to 5 V I/O support. It supports true bipolar input ranges (±12.288 V, ±6.144 V, ±10.24 V, ±5.12 V, ±2.56 V) and unipolar ranges (0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, 0 V to 5.12 V). Key performance metrics include DNL of ±0.4 LSB, INL of ±0.5 LSB, SNR of 92 dB, and THD of -107 dB.

Analog To Digital Converters (ADC) Feature Summary

• Integrated analog front-end with input drivers and overvoltage protection for simplified signal conditioning
• Software-programmable input ranges enabling flexible adaptation to various sensor signals without external components
• Low-drift internal voltage reference ensuring high DC accuracy across temperature variations
• Multi-SPI digital interface compatible with standard protocols for easy host controller integration

Analog To Digital Converters (ADC) Applications

• Analog input modules in industrial automation systems
• Semiconductor test equipment requiring high-resolution data acquisition
• Servo drive control modules for precise motor regulation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'IPW' corresponds to the TSSOP-16 package and extended industrial temperature range (-40°C to +125°C). Confirm that the ordering part number matches the exact speed grade (ADS8681 vs ADS8685/ADS8689) as sampling rates differ within the family. Ensure compatibility with the required SPI communication protocol and power supply voltages before finalizing procurement.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS8681IPW when a 1 MSPS sampling rate is required alongside 16-bit resolution. Choose this component over ADS8685 or ADS8689 if higher throughput is necessary. Consider the integrated AFE and overvoltage protection if board space is limited or if direct connection to harsh industrial signals is needed without additional protection circuitry.

Analog To Digital Converters (ADC) Part Context

The ADS8681IPW belongs to the ADS868x family of 16-bit SAR ADCs from Texas Instruments. This series shares common architectural features such as the integrated AFE, overvoltage protection, and low-drift reference. The IPW suffix specifically denotes the TSSOP-16 surface-mount package variant designed for industrial applications.

Analog To Digital Converters (ADC) Replacement Considerations

Direct functional substitutes within the same family include ADS8685 (500 kSPS) and ADS8689 (100 kSPS), which share pinouts and features but offer lower sampling rates. Verify package compatibility and thermal requirements when substituting.