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ADS8685W

現行

具可編程輸入範圍並使用 +5V 電源的 16 位元、500-kSPS、單通道、高頻寬 SAR ADC

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產品規格表

ADS8685W

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 1 Interface type Enhanced SPI, SPI Architecture SAR Input type Differential, 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) 80 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
Resolution (Bits) 16 Sample rate (max) (ksps) 500 Number of input channels 1 Interface type Enhanced SPI, SPI Architecture SAR Input type Differential, 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) 80 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
WQFN (RUM) 16 16 mm² (4 mm × 4 mm)
  • 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
  • Analog supply (5V): 1.65V to 5V I/O supply
  • Constant resistive input impedance ≥ 1MΩ
  • Input bandwidth: 450kHz
  • Input overvoltage protection: 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 high, low threshold
  • multiSPI™ interface with daisy-chain
  • Temperature range: –40°C to +125°C
  • 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
  • Analog supply (5V): 1.65V to 5V I/O supply
  • Constant resistive input impedance ≥ 1MΩ
  • Input bandwidth: 450kHz
  • Input overvoltage protection: 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 high, low threshold
  • multiSPI™ interface with daisy-chain
  • Temperature range: –40°C to +125°C

The ADS8681W, ADS8685W, and ADS8689W are an integrated data acquisition system family based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The devices feature a high-speed, high-precision SAR ADC, integrated differential analog front-end (AFE) input driver circuit. The ADS868xW includes an overvoltage protection circuit up to ±20V and an on-chip 4.096V reference with extremely low temperature drift.

The devices operate on a single 5V analog supply, but support true bipolar input ranges 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 devices offer a high resistive input impedance (≥ 1MΩ) 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 ADS8681W, ADS8685W, and ADS8689W are an integrated data acquisition system family based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The devices feature a high-speed, high-precision SAR ADC, integrated differential analog front-end (AFE) input driver circuit. The ADS868xW includes an overvoltage protection circuit up to ±20V and an on-chip 4.096V reference with extremely low temperature drift.

The devices operate on a single 5V analog supply, but support true bipolar input ranges 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 devices offer a high resistive input impedance (≥ 1MΩ) 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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ADS8685 現行 具有可編程 (±12/±10/±6/±5/±2.5V) 輸入範圍並使用 +5V 電源的 16 位元 500-kSPS 單通道 SAR ADC Reduced input signal bandwidth

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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 ADS868xW 16-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System With Programmable, Bipolar Input Ranges datasheet (Rev. A) PDF | HTML 2025/5/23
Application brief Precision ADCs in Servo Drives (Rev. A) PDF | HTML 2025/10/29

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開發板

ADS8681WEVM-PDK — ADS8681W 評估模組

ADS8681WEVM-PDK 是用於評估 ADS8681W 性能的平台，而 ADS8681W 是以漸近法暫存器 (SAR) 類比轉數位轉換器 (ADC) 為基礎的整合式資料擷取系統。此裝置配備高速高精密度 SAR ADC、整合式差動類比前端 (AFE) 輸入驅動器電路、高達 ±20V 的過電壓防護電路，以及具低溫漂移的 4.096V 晶片內建電壓參考。評估套件包含 ADS8681WEVM 板和精密主機介面 (PHI) 控制器板，可讓隨附的電腦軟體透過通用序列匯流排 (USB) 與 ADC 通訊，以進行資料擷取、配置與分析。
使用指南: PDF | HTML
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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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