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TIADS8201低功耗单片数据收罗方案

2017-11-23 06:49 PM| 发布者: 噗噗东| 查看: 2811| 评论: 0

摘要: TI公司的ADS8201是低功耗单片数据收罗系统,包罗12位接纳电容的SAR模数转换器(ADC),高性能一连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),主要 ...

TI 公司的ADS8201是低功耗单片数据收罗系统,包罗12位接纳电容的SAR模数转换器(ADC),高性能一连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),主要用在手提通信,传感器接口,手提医疗仪表,数据收罗系统和GPS芯片组.本文先容ADS8201主要特点, 功能方框架图以及细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主要特点:

• Multi-Chip Ready and Fully Enabled:234

• Low-Power, Flexible Supply Range:

C 2.2V to 5.5V Analog Supply

C 1.32mW (100kHz, +VA = 2.2V, +VD = 2.2V)

C 4.5mW (100kHz, +VA = 5V, +VD = 5V)

• Up to 100kSPS Throughput Rate

• Excellent DC Performance:

• Transducer Interfaces

C ±0.5 LSB typ, ±1.5 LSB max INL

• Portable Medical Instruments

C ±0.5 LSB typ, ±1.0 LSB max DNL • Data Acquisition Systems

C ±6 LSB Offset Error at +VA =5V • GPS Chipsets

C ±0.1%FS Gain Error at +VA = 5V SPACE

• Flexible Analog Inputs:

C True Differential Input

C Differential/Unipolar Input Range (0 to VREF)

C TAG Bit Output

C Programmable Averaging Function

C Onboard, Eight Single-Ended/Four Differential Channel Mux:

C High Input Impedance

C High-Performance PGA (Gain = 1/2/4/8)

C PGA Breakout

C Auto/Manual Channel Select with Gain.

C Auto/Manual Trigger

C Mixed Type Partial Scan

• Built-in Hardware Features:

C On-chip Conversion Clock (CCLK)

C Hardware/Software Reset

C Programmable Status/Polarity for BUSY/INT

• Flexible I/O:

C SPI-/ DSP™-Compatible Serial Interface

C Separate I/O Supply (2.2V to 5.5V)

C Onboard 8×1 FIFO Buffer

C SCLK up to 25MHz (VD = 5V)

• Multi-Chip Ready and Fully Enabled:

C Global CONVST (Independent of CS)

• Power-Down Mode

• 24-Pin 4×4 QFN Package

ADS8201应用:

• Portable Communications

• Transducer Interfaces

• Portable Medical Instruments

• Data Acquisition Systems

• GPS Chipsets

图1.ADS8201功能方框架图

图2.ADS8201细密定位应用电路图

图3.ADS8201桥式传感器应用电路图

详情请复制打开此衔接地址:

http://focus.ti.com/lit/ds/symlink/ads8201.pdf


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