TI ADS127L11宽带宽24位Delta-Sigma(ΔΣ) ADC解决方案

TI公司的ADS127L11是宽带宽24位Delta-Sigma(ΔΣ)模数转换器(ADC),采用宽带滤波器,数据速率高达400 kSPS,而采用低等待滤波器数据速率高达1067 kSPS.器件提供交流(AC)性能和直流(DC)精度以及低功耗(高速模式18.6mW)等极好组合在一起.器件集成输入和基准缓冲器以降低信件负载.低漂移调制器获得极好DC精度和低带内噪音具有杰出的AC性能.功率可调架构提供两种速度模式,以优化数据速率,分辨率和功耗.数字滤波器可配置用于宽带宽或低等待工作,允许宽带AC信能或数据吞吐量用于DC信号被优化.串行接口具有菊化链功能,以降低整个隔离阻挡层的SPI I/O.输入和输出数据和寄存器设定由循环冗余检验(CRC)特性来确认,以增强工作可靠性.器件的动态范围为111.5dB(200kSPS),THD为-120dB,INL为0.9ppm FS.失调漂移为50 nV/°C,增益漂移为0.6 ppm/°C.器件采用小型3mmx3mm WQFN封装和6.5mmx4.4mm TSSOP封装,工作温度–40°C 到 +125°C.主要用在测试测量,数据采集(DAQ),震动和振动仪表,声学和动态应力仪以及工厂自动化和控制.本文介绍了ADS127L11主要特性,简化框图和功能框图,应用电路框图以及评估模块ADS127L11EVM-PDK主要特性,电路图,材料清单和PCB设计图.

The ADS127L11 is a 24-bit, delta-sigma (ΔΣ), analogto-digital converter (ADC) with data rates up to400 kSPS using the wideband filter and up to1067 kSPS using the low-latency filter. The deviceoffers an excellent combination of ac performanceand dc precision with low power consumption(18.6 mW in high-speed mode).

The device integrates input and reference buffersto reduce signal loading. The low-drift modulatorachieves excellent dc precision with low in-band noisefor outstanding ac performance. The power-scalablearchitecture provides two speed modes to optimizedata rate, resolution, and power consumption.

The digital filter is configurable for wideband or lowlatencyoperation, allowing wideband ac performanceor data throughput for dc signals to be optimized, all inone device.

The serial interface features daisy-chain capability toreduce the SPI I/O over an isolation barrier. Input andoutput data and register settings are validated by acyclic-redundancy check (CRC) feature to enhanc...