ADS8684A
- 16-Bit ADCs with Integrated Analog Front-End
- 4-, 8-Channel MUX with Auto and Manual Scan
- Channel-Independent Programmable Inputs:
- ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V
- 10.24 V, 5.12 V, 2.56 V, 1.28 V
- 5-V Analog Supply: 1.65-V to 5-V I/O Supply
- Constant Resistive Input Impedance: 1 MΩ
- Input Overvoltage Protection: Up to ±20 V
- On-Chip, 4.096-V Reference with Low Drift
- Excellent Performance:
- 500-kSPS Aggregate Throughput
- DNL: ±0.5 LSB; INL: ±0.75 LSB
- Low Drift for Gain Error and Offset
- SNR: 92 dB; THD: –102 dB
- Low Power: 65 mW
- AUX Input → Direct Connection to ADC Inputs
- ALARM → High and Low Thresholds per Channel
- SPI™-Compatible Interface with Daisy-Chain
- Industrial Temperature Range: –40°C to 125°C
- TSSOP-38 Package (9.7 mm × 4.4 mm)
The ADS8684A and ADS8688A are 4- and 8-channel, integrated data acquisition systems based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096-V reference with low temperature drift. Operating on a single 5-V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, ±2.56 V, ±1.28V and ±0.64V, as well as unipolar input ranges of 0 V to 10.24 V, 0 V to 5.12 V, 0 V to 2.56 V and 0 V to 1.28 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high dc precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1-MΩ constant resistive input impedance irrespective of the selected input range.
The ADS8684A and ADS8688A offer a simple SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.
技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | ADS868xA 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges datasheet | PDF | HTML | 2015年 7月 14日 |
Circuit design | High common-mode differential input voltage to ±10-V ADC input circuit (Rev. A) | PDF | HTML | 2024年 9月 24日 | |
Application brief | Precision ADCs in Servo Drives | PDF | HTML | 2024年 8月 22日 | |
Circuit design | Input Protection for High-Voltage ADC Circuit with TVS Diode (Rev. A) | PDF | HTML | 2023年 5月 2日 | |
Application note | Circuit for detecting input floating on ADS8681 ADC | PDF | HTML | 2021年 3月 31日 | |
Application note | Reducing Phase Delay by Averaging on ADS8686S with Burst Sequencer Mode | PDF | HTML | 2021年 1月 11日 | |
Application note | Extending Input Voltage Range and Understanding Associated Errors for ADC With I | 2018年 11月 9日 | ||
E-book | Best of Baker's Best: Precision Data Converters -- SAR ADCs | 2015年 5月 21日 | ||
User guide | Phase-Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation (Rev. B) | 2015年 3月 12日 |
設計與開發
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ADC-TO-VREF-SELECT — ADC to Voltage Reference Selection Tool
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系列電壓參考
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
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TINA-TI — 基於 SPICE 的類比模擬程式
封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
---|---|---|
TSSOP (DBT) | 38 | Ultra Librarian |
訂購與品質
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