Analog Devices Inc. AD7172-2 24 位 Σ-Δ 型模数转换器
亚德诺半导体 AD7172-2 24-位 Σ-Δ 型模数转换器是一款智能的、低噪音、低功率、多路传输的、Σ-Δ 型模数转换器，具有两个或四个（全差分/单端）低带宽信号输入通道。扫描全稳定数据时，ADI AD7172-2 的最大通道扫描速率可达 6.21kSPS (161μs)。输出数据速率范围从 1.25SPS 至 31.25kSPS。AD7172-2 集成了重要的模拟和数字信号调理块，用户能够通过 SPI 单独配置使用中的每一模拟输入通道。模拟输入端和外部基准输入端集成真轨到轨缓冲器，可提供易于驱动的高阻抗输入。精密的 2.5V 低漂移 (f2 ppm/°C) 带隙内部基准电压源（带输出基准电压源缓冲器）增加了嵌入式功能，同时减少了外部元件数。该数字滤波器以 27.27SPS 的输出数据速率达到了 50Hz/60Hz 的同步抑制。用户可根据应用中各通道的需求在不同滤波器选项间切换，并提供进一步的数字处理功能，比如失调和增益校准寄存器，这些器件也能按通道进行配置。通用输入/输出（GPIO）可控制外部多路复用器，实现其与模数转换器转换时间的同步。额定工作温度范围为 −40°C 至 +105°C，AD7172-2 采用 24 引脚 TSSOP 封装。
The precision 2.5V low drift (f2 ppm/°C) bandgap internal reference (with an output reference buffer) adds embedded functionality to reduce external component count. The digital filter allows simultaneous 50Hz/60Hz rejection at a 27.27SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application, with further digital processing functions such as offset and gain calibration registers, which are also configurable on a per-channel basis. General-purpose inputs/outputs (GPIOs) can control external multiplexers synchronous to ADC conversion timing. The specified operating temperature range is −40°C to +105°C. AD7172-2 is in a 24-lead TSSOP package.
特性
- Fast and flexible output rate: 1.25SPS to 31.25kSPS
- Channel scan data rate of 6.21kSPS/channel (161μs settling)
- Performance specifications
- 17.2 noise-free bits at 31.25kSPS
- 24 noise-free bits at 5SPS
- INL: ±2ppm of FSR
- 85dB rejection of 50Hz and 60Hz with 50ms settling
- User-configurable input channels
- 2 fully-differential channels or 4 single-ended channels
- Crosspoint multiplexer
- On-chip 2.5V reference (±2ppm/°C drift)
- True rail-to-rail analog and reference input buffers
- Temperature range: −40°C to +105°C
应用
- Process control
- PLC/DCS modules
- Temperature and pressure measurement
- Medical and scientific multichannel instrumentation
- Chromatography
Block Diagram
发布日期: 2015-01-13
| 更新日期: 2025-02-07