原创 TI ADS1115 16位精密模数转换方案

   TI公司的ADS1113, ADS1114和ADS1115是超小型16位精密模数转换器(ADC),具有板载基准电压和振荡器,通过I2C兼容接口传输数据,工作电压从2.0V到5.5V,取样频率高达860SPS,.连续模式的功耗仅为150uA, 工作温度从–40℃ 到+140℃,可用在手提仪表,消费类产品,电池监视,温度测量以及工厂自动化和过程控制.本文介绍了ADS1113, ADS1114和ADS1115的主要特性,方框图, 基本硬件配置图, 典型连接图, 多个ADS1113/4/5连接图以及评估板ADS1015EVM/ADS1115EVM电路图和材料清单.

The ADS1113, ADS1114, and ADS1115 are precision analog-to-digital converters (ADCs) with 16 bits of resolution offered in an ultra-small, leadless QFN-10 package or an MSOP-10 package. The ADS1113/4/5 are designed with precision, power, and ease of implementation in mind. The ADS1113/4/5 feature an onboard reference and oscillator. Data are transferred via an I2C-compatible serial interface; four I2C slave addresses can be selected. The ADS1113/4/5 operate from a single power supply ranging from 2.0V to 5.5V.

The ADS1113/4/5 can perform conversions at rates up to 860 samples per second (SPS). An onboard PGA is available on the ADS1114 and ADS1115 that offers input ranges from the supply to as low as ±256mV, allowing both large and small signals to be measured with high resolution. The ADS1115 also features an input multiplexer (MUX) that provides two differential or four single-ended inputs.

The ADS1113/4/5 operate either in continuous conversion mode or a single-shot mode that automatically powers down after a conversion and greatly reduces current consumption during idle periods. The ADS1113/4/5 are specified from –40℃to +125℃.

ADS1115主要特性:

ULTRA-SMALL QFN PACKAGE:

2mm × 1,5mm × 0,4mm 

WIDE SUPPLY RANGE: 2.0V to 5.5V 

LOW CURRENT CONSUMPTION: 

Continuous Mode: Only 150µA

Single-Shot Mode: Auto Shut-Down 

PROGRAMMABLE DATA RATE: 

8SPS to 860SPS 

INTERNAL LOW-DRIFT 

VOLTAGE REFERENCE 

INTERNAL OSCILLATOR 

INTERNAL PGA 

I2C INTERFACE: Pin-Selectable Addresses 

FOUR SINGLE-ENDED OR TWO DIFFERENTIAL INPUTS (ADS1115) 

PROGRAMMABLE COMPARATOR (ADS1114 and ADS1115) 

OPERATING TEMPERATURE: –40℃ to +140℃

ADS1115应用: 

PORTABLE INSTRUMENTATION 

CONSUMER GOODS 

BATTERY MONITORING 

TEMPERATURE MEASUREMENT 

FACTORY AUTOMATION AND PROCESS CONTROLS 

图1.ADS1115功能方框图

图2.ADS1115基本硬件配置图

图3.ADS1115典型连接图


图4.多个ADS1113/4/5连接图

图5.多个器件类型连接图

图6.ADS1115EVM (左)和ADS1115EVM-PDK (右)外形图

ADS1015EVM/ADS1115EVM 评估板主要特性:

Contains all support circuitry needed for the ADS1015/ADS1115

Two ADS1015/ADS1115 devices onboard to demonstrate I2C™ bus functionality

+3.3, +5V, or external power supply options for ADC

Compatible with the TI Modular EVM System

ADS1015EVM-PDK/ADS1115EVM-PDK 主要特性:

Easy-to-use evaluation software for Microsoft® Windows® XP

Data collection to text files

Built-in analysis tools including scope, FFT, and histogram displays

Complete control of board settings

Easily expandable with new analysis plug-in tools from Texas Instruments

图7.MMB3方框图

图8. ADS1015EVM/ADS1115EVM电路图

ADS1015EVM/ADS1115EVM 材料清单:

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