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MAX181

完备的100ksps、8通道、12位数据采集系统

概述

说明

The MAX180/MAX181 are complete 12-bit Data Acquisition System (DAS) which combine 8/6 channel input multiplexer, high bandwidth Track-and-Hold (T/H), low-drift zener reference, and flexible microprocessor (µP) interface with high conversion speed and low power consuption. The MAX180/MAX181 can be configured by a µP for unipolar or bipolar conversions and single-ended or differential inputs. Both devices sample and digitize at 100kHz throughout rate and feature a fast 8- or 16-bit µP interface.

The MAX180 has 8 analog input channels, while the MAX181 has 6. The multiplexer output of the MAX180 is fed directly into the Analog-to-Digital Converter (ADC) input. The MAX181 brings out both the multiplexer output and ADC input to separate pins, allowing a programmable gain amplifier to be inserted between the MUX and the ADC.

The systems allow the user to choose between an internal or an external reference. Furthermore, the internal reference value and the offest can be adjusted, allowing the overall system gain and offset errors to be nulled. The multiplexer has high impedence inputs, simplifying analog drive requirements.

MAX180、MAX181：原理框图

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关键特性

12-Bit Resolution, ±1/2 LSB Linearity
8-Channel Multiplexer Inputs (MAX180)
Single-Ended 1-of-6 Multiplexer (MAX181)
Built-In Track-and Hold
100kHz Sampling Rate
DC and Dynamically Tested
Internal 25ppm/°C Voltage Reference
Each Channel Configurable for Unipolar (0V to +5V) or Bipolar (-2.5V to +2.5V) Input Range
Each Channel Configurable for Single-Ended or Differential Inputs
Fast 8-/16-Bit µP Interface
+5V and -12V to -15V Supply Operation
110mW Power Consumption