Analog Devices Inc. AD7175-2 24位, 250kSPS Σ-Δ 型模数转换器（ADC）
亚德诺半导体 AD7175-2 24 位、250kSPS Σ-Δ 型模数转换器是一款低噪声、快速建立、多路复用、2/4通道（全差分/伪差分）Σ-Δ型模数转换器(ADC)，实现低带宽输入。针对完全建立的数据，该器件最大通道扫描速率为 50kSPS (20μs)。输出数据速率范围从 5SPS 至 250kSPS。AD7175-2 集成关键的模拟和数字信号调理模块，可让用户针对使用的每个模拟输入通道单独进行配置。此外，设计人员还可为各通道单独选择功能。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 (2 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。数字滤波器能以 27.27SPS 输出数据速率进行达 50Hz/60Hz 的同步抑制。设计人员可根据应用中每个通道的具体需要而在不同滤波器选项之间进行切换。这款 ADC 可在每个选定的通道间进行自动切换。其他数字处理功能包括失调和增益校准寄存器，可根据各通道进行配置。亚德诺半导体 AD7175-2 Σ-Δ 型 ADC 采用 5V AVDD1 或 ±2.5V AVDD1/AVSS 和 2V 至 5V AVDD2 以及 IOVDD 电源供电，工作于 −40°C 到 +105°C 的温度范围内，特别适合过程受控的 PLC/DCS 模块、温度与 & 压力测量、医疗与 & 科研用多通道仪表、以及色谱仪。
Featuring key analog and digital signal conditioning blocks, AD7175 enables designers to configure an individual setup for each analog input channel in use. In addition, designers can select each feature on a per channel basis. Integrated true rail-to-rail buffers on the analog inputs and external reference inputs provide easy to drive high impedance inputs. The precision 2.5V low drift (2 ppm/°C) band gap internal reference (with output reference buffer) adds embedded functionality to reduce external component count. The digital filter allows simultaneous 50Hz/60Hz rejection at 27.27SPS output data rate.
The designer can switch between different filter options according to the demands of each channel in the application. The ADCs automatically switch through each selected channel. Further digital processing functions include offset and gain calibration registers, configurable on a per channel basis.
Capable of operating with 5V AVDD1, or ±2.5V AVDD1/AVSS, and 2V to 5V AVDD2 and IOVDD supplies in a temperature range of −40°C to +105°C, the Analog Devices AD7175 Sigma Delta ADCs are well-suited for PLC/DCS modules in process control, temperature & pressure measurement, medical & scientific multichannel instrumentation, and chromatography.
特性
- Fast and flexible output rate: 5SPS to 250kSPS
- Channel scan data rate of 50kSPS/channel (20μs settling)
- Performance Specifications
- 17.2 Noise Free Bits @ 250kSPS
- 20 Noise Free Bits @ 2.5kSPS
- 24 Noise Free Bits@ 20SPS
- INL: ±1ppm 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
- Internal or external clock
- Power supply: AVDD1 = 5V, AVDD2 = IOVDD = 2V to 5V
- Split supply with AVDD1/AVSS at ±2.5V
- 8.4mA ADC current
- −40°C to +105°C Temperature range
- 3- or 4-wire serial digital interface (Schmitt trigger on SCLK)
- Serial port interface (SPI), QSPI, MICROWIRE, and DSP compatible
应用
- Process control: PLC/DCS modules
- Temperature and pressure measurement
- Medical and scientific multi-channel instrumentation
- Chromatography
Block Diagram
Additional Resources
| 物料编号 | 数据表 | 通道数量 | 接口类型 |
|---|---|---|---|
| AD7175-2BRUZ-RL7 |  |
4 Channel | 3-Wire, QSPI, SPI |
| AD7175-8BCPZ-RL7 | |
8 Channel | 3-Wire, QSPI, SPI |
| AD7175-8BCPZ | |
8 Channel | 3-Wire, QSPI, SPI |
| AD7175-2BRUZ | |
4 Channel | 3-Wire, QSPI, SPI |
| AD7175-8BCPZ-RL | |
8 Channel | 3-Wire, QSPI, SPI |
| AD7175-2BRUZ-RL | |
4 Channel | 3-Wire, QSPI, SPI |