Single-Chip Digital Multimeter
This chapter describes an integrating ADC (the MAX133/134) that contains the major components of a 3 ¾-digit digital multimeter (DMM) in a single IC. The ADC can also be used for data-acquisition systems such as data loggers and weigh scales. The internal resolution is ±40,000 counts. An extra digit is supplied as a guard digit to allow autozero or tare of a 4,000-count displayed reading to 1/10 of a displayed count. The conversion time is 50 ms.
The MAX133 and MAX134 differ only in their microprocessor interface. The MAX133 has a 4-bit multiplexed address-data bus, whereas 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. ...
Get Simplified Design of Data Converters now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
