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Description

General part information

MAX140 Series

The MAX138/MAX139 are 3 ½ digit A/D converters (ADCs) with on-board LCD (MAX138) and LED (MAX139) display drivers. The MAX138/MAX139 also contain a charge-pump voltage inverter. The charge-pump inverter allows the MAX138/MAX139 to measure both positive and negative input voltages while operating from a single power-supply voltage from +2.5V to +7V. The operating circuits of the MAX138/MAX139 are similar to those of the ICL7136 and ICL7137 respectively, except the MAX138/MAX139 have an internal oscillator and an external charge-pump capacitor connected to pins 38 and 40.MAX140 is a low segment-current version of the MAX139 intended for use with low-current LED displays.Applications+3V Powered DMMs+5V Powered Panel MetersDigital ThermometersInstrumentsPortable MonitorsWeigh Scales

Technical Specifications

Parameters and characteristics for this part

SpecificationMAX1403EVKIT
ContentsBoard
Data InterfaceSerial
Input Range±VREF/gain
Number of A/D Converters1 count
Number of Bits18 bits
Power (Typ)16.9 mW
Sampling Rate (Per Second)480 Hz
Supplied ContentsBoard(s)
Utilized IC / PartMAX1403

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