MAX134CQH+D

The MAX134CQH+D is a 3¾ digit DMM circuit in 44 pin PLCC package. It contains an ADC, auxiliary circuitry such as attenuator range switches, a piezoelectric beeper driver, an active filter, a low battery detector, analogue & digital power supplies but it does not include any display drive capability. This integrating ADC for 3¾ digit multimeters & data acquisition systems such as data loggers & weight scales. ADC's internal resolution is ±40000 counts, an extra digit is supplied as a guard digit to allow auto-zero or tare of a 4000 count displayed reading to 1/10 of a displayed count. It has 3 separate address lines and 4bit bidirectional data bus. When controlled by microprocessor, IC performs auto-ranging measurement from ±400.0mV to ±4000V full scale. External attenuator resistors are required but range switching is performed by ADC. It reduces component count & system cost by minimizing external components required for analogue portion of the system.

• Supply voltage range is 0V to 9V, ±5V
• Operating temperature range from 0°C to 70°C
• Differential channel with parallel interface
• Accuracy is 0.025%
• 20 conversions per second
• Low external component count
• 5μV resolution, 100μA operating supply current

Applications

Consumer Electronics, Portable Devices

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party