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精密 ADC

ADS8684

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具有可编程 (±10/±5/±2.5V) 输入范围、+5V 电源的 16 位、500kSPS、4 通道 SAR ADC

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ADS8684

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产品详情

Resolution (Bits) 16 Sample rate (max) (ksps) 500 Number of input channels 4 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 4 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 ADC with Integrated Analog Front-End
  • 4-, 8-Channel MUX with Auto and Manual Scan
  • Channel-Independent Programmable Input Ranges:
    • Bipolar: ±10.24 V, ±5.12 V, and ±2.56 V
    • Unipolar: 10.24 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:
    • 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
  • SPI™-Compatible Interface with Daisy-Chain
  • –40°C to 125°C Industrial Temperature Range
  • TSSOP-38 Package (9.7 mm × 4.4 mm)
  • 16-Bit ADC with Integrated Analog Front-End
  • 4-, 8-Channel MUX with Auto and Manual Scan
  • Channel-Independent Programmable Input Ranges:
    • Bipolar: ±10.24 V, ±5.12 V, and ±2.56 V
    • Unipolar: 10.24 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:
    • 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
  • SPI™-Compatible Interface with Daisy-Chain
  • –40°C to 125°C Industrial Temperature Range
  • TSSOP-38 Package (9.7 mm × 4.4 mm)

The ADS8684 and ADS8688 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, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 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 ADS8684 and ADS8688 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 ADS8684 and ADS8688 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, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 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 ADS8684 and ADS8688 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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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 ADS868x 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges 数据表 (Rev. C) PDF | HTML 2015-4-21
应用简报 伺服驱动器中的精密 ADC (Rev. A) PDF | HTML 英语版 (Rev.A) PDF | HTML 2025-11-19
电路设计 ±10V ADC 输入电路的高共模差分输入电压 (Rev. A) PDF | HTML 英语版 (Rev.A) PDF | HTML 2024-10-14
电路设计 采用 TVS 二极管的高压 ADC 电路输入保护 (Rev. A) PDF | HTML 英语版 (Rev.A) PDF | HTML 2023-5-15
应用手册 用于检测 ADS8681 ADC 上输入浮动的电路 PDF | HTML 英语版 PDF | HTML 2021-9-14
应用手册 使用突发序列器模式在 ADS8686S 上进行平均来降低相位延迟 英语版 PDF | HTML 2021-9-7
应用手册 Extending Input Voltage Range and Understanding Associated Errors for ADC With I 2018-11-9
白皮书 Voltage-reference impact on total harmonic distortion 2016-8-1
电子书 Best of Baker's Best: Precision Data Converters -- SAR ADCs 2015-5-21
用户指南 Phase Compensated 8-CH Multiplexed Data Acquisition System for Power Automation (Rev. B) 2015-3-12

设计与开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

评估板

ADS8688EVM-PDK — ADS8688 16 位、500kSPS、8 通道、单电源 SAR ADC EVM 性能演示套件 (PDK)

ADS8688 评估模块 (EVM) 性能演示套件 (PDK) 是用于评估 ADS8588 产品的平台。ADS8688 是基于 16 位 SAR ADC 的八通道集成式数据采集系统。

评估套件包括 ADS8688 评估板、精密主机接口 (PHI) 控制器板和随附的计算机软件，借助此软件，用户便可通过通用串行总线 (USB) 与 ADC 进行通信，并可采集数据和进行数据分析。
用户指南: PDF | HTML
支持的产品和硬件
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驱动程序或库

ADS8688SW-LINUX — ADS8688 Linux® 驱动程序

The Linux driver supports the ADS868x 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges. The Linux driver supports communication through the SPI bus and interfaces with the IIO sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
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支持的产品和硬件
仿真模型

ADS8684 IBIS Model

SBAM200.ZIP (37 KB) - IBIS 模型
支持的产品和硬件
仿真模型

ADS868x TINA Model

SBAM201.ZIP (1597 KB) - TINA-TI 参考设计
支持的产品和硬件
计算工具

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

模拟工程师计算器旨在加快模拟电路设计工程师经常运用的许多重复性计算。该基于 PC 的工具提供图形界面，其中显示各种常见计算列表，从使用反馈电阻器设置运算放大器增益到选择合适的电路设计元件，以稳定模数转换器 (ADC) 驱动器缓冲器电路。

除了可用作独立工具之外，该计算器还能很好地与模拟工程师口袋参考中所述的概念配合使用。

支持的产品和硬件
设计工具

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.
支持的产品和硬件
参考设计

TIDA-00310 — 适用于智能电网 IED 的模拟输入、输出和继电器驱动器输出模块参考设计

保护继电器和 RTU 等智能电网器件需要与电网中使用模拟 IO（如 5V 至 10V 直流电压或 4mA 至 20mA 电流）的其他器件进行通信，此参考设计为这些智能电网器件提供了灵活的模拟 IO 解决方案。此解决方案支持两种类型的 IO 以及电源数字继电器驱动器。此模块包含用于与处理器通信的 SPI 和 I2C 通信接口。

支持的产品和硬件
参考设计

TIPD167 — 用于电力自动化并支持相位补偿的 8 通道多路复用数据采集系统参考设计

此 TI 精选设计提供原理、元件选择、TINA-TI 仿真、验证和测量性能、Altium 原理图和 PCB 布局，用于电力自动化中的相位补偿 8 通道多路复用数据采集系统。  该设计采用 ADS8688（16 位、8 通道、500ksps SAR ADC），并集成模拟前端电路，以简化系统硬件设计。

该设计引入相位及相位补偿概念，对比非同步采样 ADC 与同步采样 ADC 在各输入通道之间产生的额外相位延迟，并提供一种优化算法，用于补偿非同时采样所引入的相位延迟。

测试结果表明，该设计中的相位补偿算法能够有效补偿多路复用 ADC 引入的额外相位延迟，使其性能接近同步采样 ADC 方案。

支持的产品和硬件
封装 引脚 CAD 符号、封装和 3D 模型
TSSOP (DBT) 38 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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