產品詳細資料

Resolution (Bits) 16 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type Enhanced SPI, SPI Architecture SAR Input type Single-ended Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 12.288 Input voltage range (min) (V) -12.288 Features Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 42 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 90.5 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
Resolution (Bits) 16 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type Enhanced SPI, SPI Architecture SAR Input type Single-ended Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 12.288 Input voltage range (min) (V) -12.288 Features Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 42 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 90.5 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
TSSOP (PW) 16 32 mm² (5 mm × 6.4 mm) WQFN (RUM) 16 16 mm² (4 mm × 4 mm)
  • 16-bit ADC with integrated analog front-end
  • High speed:
    • ADS8681: 1 MSPS
    • ADS8685: 500 kSPS
    • ADS8689: 100 kSPS
  • Software programmable input ranges:
    • Bipolar ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V
    • Unipolar ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 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:
    • DNL: ±0.4 LSB; INL: ±0.5 LSB
    • SNR: 92 dB; THD: –107 dB
  • ALARM → high, low threshold
  • multiSPI™ interface with daisy-chain
  • Extended industrial temperature range: –40°C to +125°C
  • 16-bit ADC with integrated analog front-end
  • High speed:
    • ADS8681: 1 MSPS
    • ADS8685: 500 kSPS
    • ADS8689: 100 kSPS
  • Software programmable input ranges:
    • Bipolar ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V
    • Unipolar ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 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:
    • DNL: ±0.4 LSB; INL: ±0.5 LSB
    • SNR: 92 dB; THD: –107 dB
  • ALARM → high, low threshold
  • multiSPI™ interface with daisy-chain
  • Extended industrial temperature range: –40°C to +125°C

The ADS8681, ADS8685, and ADS8689 belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift.

The devices operate on a single 5-V analog supply, but support true bipolar input ranges of ±12.288 V, ±6.144 V, ±10.24  V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 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. The gain and offset errors are accurately trimmed within the specified values for each input range to ensure high dc precision. The input range selection is done by software programming of the device internal registers. The devices offer a high resistive input impedance (≥ 1 MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.

The ADS8681, ADS8685, and ADS8689 belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift.

The devices operate on a single 5-V analog supply, but support true bipolar input ranges of ±12.288 V, ±6.144 V, ±10.24  V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 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. The gain and offset errors are accurately trimmed within the specified values for each input range to ensure high dc precision. The input range selection is done by software programming of the device internal registers. The devices offer a high resistive input impedance (≥ 1 MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.

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開發板

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使用指南: PDF
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開發模組 (EVM) 的 GUI

SBAC146 — ADS8681EVM-PDK GUI

Evaluate the ADS8681 and ADS8681W using the evaluation module (EVM) product development kit (PDK)
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模擬型號

ADS8681 IBIS Model

SBAM268.ZIP (36 KB) - IBIS 模型
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模擬型號

ADS8681 TINA-TI Ref Design

SBAM266.ZIP (135 KB) - TINA-TI 參考設計
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模擬型號

ADS8681 TINA-TI Spice Model

SBAM267.ZIP (40 KB) - TINA-TI Spice 模型
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計算工具

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參考設計

TIDA-00764 — 八通道隔離式高電壓類比輸入模組參考設計

此參考設計為具八個通道的高電壓類比輸入模組。每個通道都可用於電壓和電流測量。此設計採用 16 位元類比轉數位轉換器 (ADC) ADS8681,可處理高達 ±12.288V 的輸入電壓。因此不需要對工業領域中的標準輸入電壓進行任何預處理。此外,此設計中的四個通道可處理高達 ±160V 的共模 (CM) 電壓。因此,使用者不需要擔心接地環路或補償電流在連接的輸入間流動。
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參考設計

TIDA-01333 — 採用 ISOW7841 的八通道隔離式高電壓類比輸入模組參考設計

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
TSSOP (PW) 16 Ultra Librarian
WQFN (RUM) 16 Ultra Librarian

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