描述
ADS 1146、ADS 1147和ADS 1148器件是精密16位模拟数字转换器（ADC），包含许多集成功能，可降低传感器测量应用的系统成本和元件数量。这些器件具有低噪音可编程放大器（PGA）、带单周期建立数字过滤器的精密三角积分（A RST）ADC和内部振荡器。ADS 1147和ADS 1148器件还提供内置低漂移基准电压源和两个匹配的可编程激励电流源（IDAC）。输入多路转换器支持ADS 1148的四个差异输入、ADS 1147的两个差异输入和ADS 1146的一个差异输入。此外，该多路转换器集成了传感器烧毁检测、热电偶电压偏置、系统监控和通用数字I/O（ADS 1147和ADS 1148）。PGA提供高达128 V/V的可选放大。这些功能为温度传感器测量应用提供了完整的前端解决方案，包括热电偶、可控硅和电阻温度检测器（RTL）以及其他小信号测量，包括电阻桥传感器。数字过滤器在单周期内稳定下来，以在使用输入多路转换时支持快速通道循环，并提供高达2 kPS的数据速率。对于20 IPS或更低的数据速率，50 Hz和60 Hz干扰都会被过滤器抑制。
特性
·可编程数据速率高达2 kSPS
·所有数据速率的单周期建立
·20次脉冲时同时抑制50 Hz和60 Hz
·模拟多路转换器，具有8个（ADS 1148）和4个（ADS 1147）独立选择输入
·可编程放大：1 V/V至128 V/V
·双匹配可编程激励电流源
·低漂移内部2.048-V基准电压源
·传感器烧坏检测
· 4或8个通用I/O（ADS 1147和ADS 1148）
·内部温度传感器
·电源和VDR监控（ADS 1147和ADS 1148）
·自我和系统校准
· SPI™-兼容的序列接口
·模拟电源：单极（2.7
描述
The ADS1146, ADS1147, and ADS1148 devices are precision, 16-bit analog-to-digital converters (ADCs) that include many integrated features to reduce system cost and component count for sensor measurement applications. The devices feature a low-noise, programmable gain amplifier (PGA), a precision delta-sigma (ΔΣ) ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1147 and ADS1148 devices also provide a built-in, low-drift voltage reference, and two matched programmable excitation current sources (IDACs).An input multiplexer supports four differential inputs for the ADS1148, two for the ADS1147, and one for the ADS1146. In addition, the multiplexer integrates sensor burn-out detection, voltage bias for thermocouples, system monitoring, and general purpose digital I/Os (ADS1147 and ADS1148). The PGA provides selectable gains up to 128 V/V. These features provide a complete front-end solution for temperature sensor measurement applications including thermocouples, thermistors, and resistance temperature detectors (RTDs) and other small signal measurements including resistive bridge sensors. The digital filter settles in a single cycle to support fast channel cycling when using the input multiplexer and provides data rates up to 2 kSPS. For data rates of 20 SPS or less, both 50-Hz and 60-Hz interference are rejected by the filter.
特性
• Programmable Data Rates Up to 2 kSPS
• Single-Cycle Settling for All Data Rates
• Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS
• Analog Multiplexer With 8 (ADS1148) and 4 (ADS1147) Independently Selectable Inputs
• Programmable Gain: 1 V/V to 128 V/V
• Dual-Matched Programmable Excitation Current Sources
• Low-Drift Internal 2.048-V Reference
• Sensor Burnout Detection
• 4 or 8 General-Purpose I/Os (ADS1147 and ADS1148)
• Internal Temperature Sensor
• Power Supply and VREF Monitoring (ADS1147 and ADS1148)
• Self and System Calibration
• SPI™-Compatible Serial Interface
• Analog Supply: Unipolar (2.7 V to 5.25 V) or Bipolar (±2.5 V)
• Digital Supply: 2.7 V to 5.25 V
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