Maxim MAX11359A智能数据采集方案

Maxim 公司的MAX11359A智能数据采集系统(DAS)是基于16位sigma-delta模拟数据转换器(ADC),集成了ADC,DAC,运算放大器,可选择的基准电压,温度传感器,模拟开关, 32kHz振荡器,带告警功能的实时时钟,高频锁相还(FLL),四个可编程I/O,中断发生器,以及1.8V和2.7V电压监视器,主要用在以电池为能源和手提设备,电化学和光学传感器,医疗设备,工业控制和数据采集系统.本文介绍了MAX11359A的主要特性,方框图以及各种应用电路,包括带双LED和单个光电二极管的光反射计应用电路, 带两个遥控传感器的温度补偿电路,可编增益仪表放大器, LCD 对比度调整应用电路和单端和差分压电蜂鸣器驱动电路等.

The MAX11359A smart data-acquisition system (DAS) is based on a 16-bit, sigma-delta analog-to-digital converter (ADC) and system-support functionality for a microprocessor(μP)-based system. The device integrates an ADC, DAC, operational amplifiers, internal selectable reference, temperature sensors, analog switches, a 32kHz oscillator, a real-time clock (RTC) with alarm, a high-frequency-locked loop (FLL) clock,four user-programmable I/Os, an interrupt generator, and 1.8V and 2.7V voltage monitors in a single chip.

The MAX11359A has dual 10:1 differential input multiplexers (muxes) that accept signal levels from 0 to AVDD. An on-chip 1x to 8x programmable-gain amplifier (PGA) measures low-level signals and reduces external circuitry required.

The MAX11359A operates from a single +1.8V to +3.6V supply and consumes only 1.4mA in normal mode and only 6.1μA in sleep mode. The MAX11359A has one DAC with two uncommitted op amps.

The serial interface is compatible with either SPI™/QSPI™ or MICROWIRE™, and is used to power up, configure, and check the status of all functional blocks.

The MAX11359A is available in a space-saving 40-pin TQFN package and is specified over the commercial (0℃ to +70℃) and the extended (-40℃ to +85℃) temperature ranges.

MAX11359A主要特性:

+1.8V to +3.6V Single-Supply Operation

Multichannel 16-Bit Sigma-Delta ADC

10sps to 512sps Programmable Conversion Rate

Self and System Offset and Gain Calibration

PGA with Gains of 1, 2, 4, or 8

Unipolar and Bipolar Modes

10-Input Differential Multiplexer

10-Bit Force-Sense DAC

Uncommitted Op Amps

Dual SPDT Analog Switches

Selectable References

1.251V, 1.996V, and 2.422V

Internal Charge Pump

System Support

Real-Time Clock and Alarm Register

Internal/External Temperature Sensor

Internal Oscillator with Clock Output

User-Programmable I/O and Interrupt Generator

VDD Monitors

SPI/QSPI/MICROWIRE, 4-Wire Serial Interface

Space-Saving (6mm x 6mm x 0.8mm) 40-Pin TQFN

Package

MAX11359A应用:

Battery-Powered and Portable Devices

Electrochemical and Optical Sensors

Medical Instruments

Industrial Control

Data-Acquisition Systems

图1.MAX11359A功能方框图

图2.带双LED和单个光电二极管的光反射计应用电路

图3.MAX11359A 带两个遥控传感器的温度补偿电路

图4.MAX11359A可编增益仪表放大器

图5.MAX11359A 在LCD 对比度调整应用电路

图6.MAX11359A在传感器偏压调整应用电路

图7. MAX11359A 电源睡眠模式占空比应用电路

图8.MAX11359A单端压电蜂鸣器驱动电路

图10.MAX11359A 差分压电蜂鸣器驱动电路