低功耗单片数据采集方案.doc

TI ADS8201低功耗单片数据采集方案TI 企业旳ADS8201是低功耗单片数据采集系统,包括12位采用电容旳SAR模数转换器(ADC),高性能持续时间可编增益放大器(PGA)以及全自动扫描8:1复接器,模拟电压2.2V到5.5V,高达100kSPS吞吐量速率, SCLK 高达25MHz (VD = 5V),重要用在手提通信,传感器接口,手提医疗仪表,数据采集系统和GPS芯片组.本文简介ADS8201重要特性, 功能方框图以及精密定位应用电路图和桥式传感器应用电路图.The ADS8201 is a low-power, complete on-chip data acquisition system optimized for portable applications that require direct connections, wide dynamic range, and automatic operation with very low power consumption. The device includes a 12-bit, capacitor-based, successive approximation register (SAR) analog-to-digital converter (ADC); a high-performance, continuous-time programmable gain amplifier (PGA); and a fully automatic scan, 8-to-1 multiplexer (mux) with breakout to allow for system design flexibility.Many other features are included to further optimize system operation. Conversion results may be saved in an onboard first-in/first-out (FIFO) buffer and read out at a later time. Each channel has a gain setting that can be loaded automatically when it is selected.ADS8201重要特性: Multi-Chip Ready and Fully Enabled:234 Low-Power, Flexible Supply Range: 2.2V to 5.5V Analog Supply 1.32mW (100kHz, +VA = 2.2V, +VD = 2.2V) 4.5mW (100kHz, +VA = 5V, +VD = 5V) Up to 100kSPS Throughput Rate Excellent DC Performance: Transducer Interfaces 0.5 LSB typ, 1.5 LSB max INL Portable Medical Instruments 0.5 LSB typ, 1.0 LSB max DNL Data Acquisition Systems 6 LSB Offset Error at +VA =5V GPS Chipsets 0.1%FS Gain Error at +VA = 5V SPACE Flexible Analog Inputs: True Differential Input Differential/Unipolar Input Range (0 to VREF) TAG Bit Output Programmable Averaging Function Onboard, Eight Single-Ended/Four Differential Channel Mux: High Input Impedance High-Performance PGA (Gain = 1/2/4/8) PGA Breakout Auto/Manual Channel Select with Gain. Auto/Manual Trigger Mixed Type Partial Scan Built-in Hardware Features: On-chip Conversion Clock (CCLK) Hardware/Software Reset Programmable Status/Polarity for BUSY/INT Flexible I/O: SPI-/ DSP-Compatible Serial Interface Separate I/O Supply (2.2V to 5.5V) Onboard 81 FIFO Buffer SCLK up to 25MHz (VD = 5V) Multi-Chip Ready and Fully Enabled: Global CONVST (Independent of CS) Power-Down Mode 24-Pin 44 QFN PackageADS8201应用: Portable Communications Transducer Interfaces Portable Medical Instruments Data Acquisition Systems GPS Chipsets图1.ADS8201功能方框图图2.ADS8201精密定位应用电路图AO-Electronics 傲壹电子 官网：.com 中文网：.cnALPS ADI IR JRC/NJR KEC OTAX Seoul Semiconductor TI Walsin Technology图3.ADS8201桥式传感器应用电路图