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類比轉數位轉換器 (ADC)
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ADS8688A

現行

具雙極輸入的 16 位元 500kSPS 8 通道 SAR ADC，使用 5V 電源和低漂移 VREF

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產品規格表

ADS8688A

現行
產品規格表 立即訂購

產品詳細資料

Resolution (Bits) 16 Sample rate (max) (ksps) 500 Number of input channels 8 Interface type SPI Architecture SAR Input type Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 10.24 Input voltage range (min) (V) -10.24 Features Daisy-Chainable, Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 65 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 92 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
Resolution (Bits) 16 Sample rate (max) (ksps) 500 Number of input channels 8 Interface type SPI Architecture SAR Input type Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 10.24 Input voltage range (min) (V) -10.24 Features Daisy-Chainable, Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 65 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 92 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
TSSOP (DBT) 38 62.08 mm² (9.7 mm × 6.4 mm)
  • 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)
  • 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.

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.
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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 ADS868xA 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges datasheet PDF | HTML 2015/7/14
Application brief Precision ADCs in Servo Drives (Rev. A) PDF | HTML 2025/10/29
Circuit design High common-mode differential input voltage to ±10-V ADC input circuit (Rev. A) PDF | HTML 2024/9/24
Circuit design Input Protection for High-Voltage ADC Circuit with TVS Diode (Rev. A) PDF | HTML 2023/5/2
應用說明 EMC Compliance Testing for Precision ADC Systems (Rev. A) PDF | HTML 2022/5/27
應用說明 Circuit for detecting input floating on ADS8681 ADC PDF | HTML 2021/3/31
Application brief Supporting High Voltage Common Mode Using Difference Amplifier PDF | HTML 2021/3/8
Application brief Supporting High Voltage Common Mode Using Instrumentational Amplifier PDF | HTML 2021/2/23
應用說明 Reducing Phase Delay by Averaging on ADS8686S with Burst Sequencer Mode PDF | HTML 2021/1/11
Application brief 16-Bit 8-Channel PLC Analog Input Module with High Voltage (±150 V) Common Mode 2020/4/27
應用說明 Extending Input Voltage Range and Understanding Associated Errors for ADC With I 2018/11/9
白皮書 Voltage-reference impact on total harmonic distortion 2016/8/1
電子書 Best of Baker's Best: Precision Data Converters -- SAR ADCs 2015/5/21
使用指南 Phase-Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation (Rev. B) 2015/3/12

設計與開發

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模擬型號

ADS8688 IBIS Model

SBAM199.ZIP (37 KB) - IBIS 模型
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模擬型號

ADS868x TINA Model

SBAM201.ZIP (1597 KB) - TINA-TI 參考設計
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計算工具

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

類比工程師的計算機旨在加速類比電路設計工程師定期使用的許多重複計算。此基於 PC 的工具提供圖形介面，列出各種常見計算，從使用回饋電阻器設定運算放大器增益到選擇適當的電路設計元件以穩定類比數位轉換器 (ADC) 驅動緩衝電路。

除了作為獨立工具使用外，此計算機還與類比工程師口袋參考中描述的概念相得益彰。

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設計工具

ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired reference voltage, and the tool will list up to two voltage reference recommendations.
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參考設計

TIDA-01214 — 採用16 位元 ADC 和數位隔離器的隔離式高準確度類比輸入模組參考設計

此參考設計在廣泛輸入範圍內使用精密 16 位元 SAR ADC，提供準確的 AC 電壓和電流輸入測量，涵蓋保護和測量範圍 (包括 IEC 61850-9-2 的取樣要求)、簡化系統設計，並改善跳脫時間性能和可靠性。類比輸入模組 (AIM) 使用具有整合電源的數位隔離器，與主機處理器隔離。針對有限功能與成本最佳化的設計方法，AC AIM 僅可使用三種 TI 產品設計，可降低系統成本與電路板尺寸。警報功能會以取樣方式識別 AC 類比輸入故障，以加快故障偵測速度。ADC 具有額外的輔助通道，可診斷數位隔離器的電源輸出。具增益放大器的 12 位元 ADS8668 (...)
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參考設計

TIDA-01576 — 具有 16 位元 1-MSPS 雙同步取樣 ADC 的高準確度類比輸入模組參考設計

此參考設計在廣泛輸入範圍內，使用精密 16 位元 SAR ADC 準確測量 16 通道 AC 電壓及電流輸入。此範圍涵蓋保護與測量要求 (包括 IEC 61850-9-2 的取樣要求)，可簡化系統設計並提升跳脫時間重複性、性能與可靠性。AC 類比輸入模組 (AIM) 使用具有整合電源轉換器或採用六通道的數位隔離器，與主機處理器隔離。在最簡單的配置中，完整的 AC AIM 只需使用五種 TI 產品即可設計，進而實現系統成本與尺寸最佳化。警報功能會以取樣方式識別 AC AIM 故障，以加快故障偵測速度。ADC 具有額外的輔助通道，可診斷數位隔離器電源的輸出，或補償量測類比輸入的溫度漂移。
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
TSSOP (DBT) 38 Ultra Librarian
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