Texas Instruments ADS868xW 16-Bit SAR Analog-to-Digital Converters
Texas Instruments ADS868xW 16-Bit SAR Analog-to-Digital Converters (ADCs) are an integrated data acquisition system family based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The devices feature a high-precision, high-speed SAR ADC and an integrated differential analog front-end (AFE) input driver circuit. The ADS868xW includes an overvoltage protection circuit of up to ±20V and an on-chip 4.096V reference with extremely low-temperature drift.
The Texas Instruments ADS868xW devices operate on a single 5V analog supply but support true bipolar and unipolar input ranges. The bipolar input ranges are ±12.288V, ±6.144V, ±10.24V, ±5.12V, and ±2.56V, and the unipolar input ranges are from 0V to 12.288V, 10.24V, 6.144V, and 5.12V. The multiSPI digital interface is backward-compatible to the traditional SPI protocol. The devices offer a high resistive input impedance (≥ 1MΩ) irrespective of the selected input range. Additionally, configurable features simplify the interface to various host controllers.
Features
- 16-bit ADC with integrated analog front-end
- High speed
- ADS8681W: 1MSPS
- ADS8685W: 500kSPS
- ADS8689W: 100kSPS
- Software programmable input ranges
- Bipolar differential ranges: ±12.288V, ±10.24V, ±6.144V, ±5.12V, and ±2.56V
- Unipolar differential ranges: 0V–12.288V, 0V–10.24V, 0V–6.144V, and 0V–5.12V
- 1.65V to 5V I/O supply analog supply (5V)
- Constant resistive input impedance ≥ 1MΩ
- 450kHz input bandwidth
- Input overvoltage protection of up to ±20V
- On-chip, 4.096V reference with low drift
- Excellent performance
- DNL: ±0.6LSB; INL: ±0.6LSB
- SNR: 80dB; THD: –105dB
- ALARM feature with a high, low threshold
- multiSPI™ interface with daisy-chain
- -40°C to +125°C extended industrial temperature range
Applications
- Analog input modules
- Semiconductor tests
- Servo drive control modules
Functional Block Diagram
Related Development Tool
Texas Instruments ADS8681WEVM-PDK Evaluation Module (EVM)
Evaluates the performance of the ADS8681W, an integrated data acquisition system based on a SAR ADC.
Yayınlandı: 2024-08-23
| Güncellenmiş: 2025-07-10