MAX134CPL+

ADCs/DACs - Special Purpose Overview

The MAX134CPL+ is a 3¾ digit digital multimeter (DMM) circuit manufactured by Analog Devices Inc. under the Maxim Integrated brand. It integrates a dual-slope analog-to-digital converter, a precision reference, and direct LED drivers into a single package. The device operates from a single +5V supply with a typical supply current of 2mA. It features an internal charge pump that generates ±15V rails for the ADC and input buffers, eliminating the need for external negative voltage supplies. The component is housed in a 40-lead plastic DIP package and supports a commercial operating temperature range of 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3¾ digit dual-slope ADC with built-in precision reference and charge pump
• Direct LED driver outputs capable of driving up to four 7-segment displays
• Single +5V supply operation with internal generation of ±15V rails
• On-chip oscillator eliminates the need for external clock components

ADCs/DACs - Special Purpose Applications

• Battery-powered digital multimeters
• Panel meters and industrial process control instruments
• Precision weighing scales
• Temperature controllers

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'CPL+' against the manufacturer's ordering information to confirm the 40-lead plastic DIP package and commercial temperature rating. Confirm RoHS compliance status as indicated by the '+' suffix. Ensure the design accommodates the required external resistor and capacitor values specified in the datasheet for optimal performance.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX134CPL+ when a complete 3¾ digit DMM solution is required without external ADCs or charge pumps. Choose this part over the MAX133 variant if direct LED drive capability is necessary. Verify that the application environment remains within the 0°C to +70°C commercial temperature range; otherwise, consider the MAX134EPL+ for extended industrial temperatures.

ADCs/DACs - Special Purpose Part Context

The MAX134CPL+ belongs to the MAX133/MAX134 family of integrated DMM circuits designed to simplify the implementation of high-accuracy measurement systems. These devices consolidate functions typically requiring multiple discrete components, including the ADC, reference, and display drivers, into a compact 40-pin DIP footprint suitable for through-hole assembly.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX133CPL+ serves as a functional substitute within the same family but lacks the integrated LED drivers found in the MAX134. Designers must verify pin compatibility and ensure that any missing driver functionality can be addressed by external logic or transistors.