Texas Instruments ADS8681 SAR ADC Data Acquisition System

Texas Instruments ADS8681 SAR ADC Data Acquisition System
TI offers the ADS8681 16-bit 1 MSPS single-supply SAR ADC data acquisition system with programmable, bipolar input range
Image of Texas Instruments ADS8681 SAR ADC Data Acquisition System The TI ADS8681 is an integrated data acquisition system based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput rate of 1 MSPS. The device features a high-accuracy SAR ADC, integrated analog front-end (AFE) input driver circuitry, ±20 V overvoltage protection circuitry, and an on-chip 4.096 V reference with very low temperature drift. Texas Instruments ADS8681 operates from a single 5 V analog supply and supports true ±12.288 V, ±6.144 V, ±10.24 V, ±5.12, and ±2.56 V bipolar ranges, as well as 0 V to 12.288 V, 0 V to 10.24 V , 0 V to 6.144 V, and 0 V to 5.12 V unipolar input ranges. The gain and offset errors of the AFE circuit are precisely trimmed to specified values ​​for each input range to ensure high DC accuracy. Input range selection is software programmable through the device's internal registers. The device provides a high resistive input impedance above 1 MΩ, regardless of input range.

Texas Instruments ADS8681 provides an enhanced SPI™-compatible serial interface (multiSPI™) to a digital host, while also allowing multiple devices to be daisy-chained. The digital power supply operates from 1.65 V - 5.25 V, so it can interface directly with a variety of different host controllers.

Texas Instruments ADS8681 Features
16-bit ADC with integrated analog front end
Software programmable input range
Bipolar ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 and ±2.56 V.
Unipolar ranges: 0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V.
5 V analog power supply: 1.65 V to 5 V I/O voltage
Constant Resistive Input Impedance: Above 1 MΩ
Input overvoltage protection: up to ±20 V
On-chip 4.096 V low drift reference
Alarms → high and low thresholds for each channel
Texas Instruments ADS8681 performs well:
Aggregate Throughput: 1 MSPS
DNL: ±0.4 LSB; INL: ±0.5 LSB
SNR: 92 dB; THD: -107 dB
MultiSPI interface with daisy-chain support
Industrial temperature range: -40°C -- 125°C
Package:
16-pin, TSSOP (5 mm x 4.4 mm)
16-pin, WQFN (4 mm x 4 mm)