TI ADS8688八路数据采集系统开发方案.docxVIP

TI ADS8688八路数据采集系统开发方案TI公司的ADS8688是基于16位逐次逼近(SAR)模数转换器(ADC)的八路数据采集系统,工作在500kSPs的吞吐量.双极工作电源±10.24 V,±5.12 V和±2.56 V,单极工作电源0 V 到 10.24 V和0 V到5.12 V,输出保护电压高达成±20 V,低功耗65mW,具有极好的性能: SNR: 92 dB;THD:–102 dB.主要用于工业控制,PLC和数据采集系统.本文介绍了ADS8688主要特性,框图,以及在电源自动化和PLC的数据采集系统框图, ADS8688EVM-PDK 评估模块主要特性和GUI主要特性,电路图,材料清单和六层PCB设计图.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.ADS8688主要特性:16-Bit ADC with Integrated Analog Front-End4-, 8-Channel MUX with Auto and Manual ScanChannel-Independent Programmable Input Ranges:Bipolar: ±10.24 V, ±5.12 V, and ±2.56 VUnipolar: 0 V to 10.24 V and 0 V to 5.12 V5-V Analog Supply: 1.65-V to 5-V I/O SupplyConstant Resistive Input Impedance: 1 MΩInput Overvoltage Protection: Up to ±20 VOn-Chip, 4.096-V Reference with Low DriftExcellent Performance:500-kSPS Aggregate ThroughputDNL: ±0.5 LSB; I