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MAX134：3¾位数字DMM电路

The MAX133 and MAX134 are integrating A/D converters for 3¾ digit multimeters and data acquisition systems such as data loggers and weigh scales. The A/D's internal resolution is ±40,000 counts. An extra digit is supplied as a guard digit to allow autozero or tare of a 4000 count displayed reading to 1/10 of a displayed count. The conversion time is 50ms. The MAX133 and MAX134 differ only in their microprocessor interface. The MAX133 has a 4 bit multiplexed address/data bus while the MAX134 has 3 separate address lines and a 4 bit bidirectional data bus. Both devices can be used with 4, 8, and 16 bit microprocessors. When controlled by a microprocessor, the MAX133 and MAX134 can perform auto-ranging measurements from ±400.0mV to ±4000V full scale. External attenuator resistors are required, but range switching is performed by the A/D. The power supply is typically a 9V battery or ±5V. Operating current is typically 100µA while standby current is only 25µA.

关键特性 40,000 Count Resolution 0.025% Accuracy 20 Conversions per Second Microprocessor Interface 100µA Operating Supply Current Low External Component Count 5µV Resolution Demonstration Kit Available MAX134/DEMO

MAX133、MAX134：引脚配置 应用 数据采集系统 数据记录仪 数字面板表 称重仪

数据手册DataSheet

关键参数

开发工具

• MAX134EVKIT

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