with Display Hold

MAX136

Typical Operating Circuit

Pin Configurations

General Description

The MAX136 is a monolithic analog-to-digital converter

(ADC) with very high input impedance. It differs from the

Maxim ICL7136 in that the MAX136 provides a Hold pin,

which makes it possible to hold or "freeze" a reading. The

MAX136 directly drives a nonmultiplexed liquid crystal

(LCD) display, requiring no external drive circuitry. With

minor external component changes, it is pin compatible

with the ICL7116 but with significantly reduced power

consumption, making the MAX136 a superior device for

portable systems.

Versatility and accuracy are inherent features of this

ADC. The dual-slope conversion technique automatically

rejects interference signals common in industrial envi-

ronments. True differential inputs allow direct measure-

ments of bridge transducer outputs or load cells. The

zero-integrator phase eliminates overrange hangover

and hysteresis effects. The MAX136 offers high accuracy

by lowering rollover error to less than one count and zero

reading drift to less than 1µV/°C.

Applications

These devices can be used in a wide range of digital

panel meter applications. Most applications, however,

involve the measurement and display of analog data:

Features

• PowerDissipationGuaranteedLessthan1mW–9V

BatteryLife3000HoursTypical

• HoldPinAllowsIndefiniteDisplayHold

• GuaranteedFirstReadingRecoveryfrom

Overrange

• On-BoardDisplayDriveCapability—NoExternal

CircuitryRequired

• High-ImpedanceCMOSDifferentialInputs

OverrangeHangover

• ClockandReferenceOn-Chip

• ZeroInputGivesZeroReading

• TruePolarityIndicationforPrecisionNull

Applications

• KeyParametersGuaranteedOverTemperature

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

Pressure

Voltage

Resistance

Temperature

Conductance

Current

Speed

Material Thickness

Pin Configurations continued at end of data sheet

(Detailed Circuit Diagram—See 3rd page)

MAX136

ANALOG

INPUT

9V

TO ANALOG

COMMON (P32)

LCD DISPLAY

PART

TEMPRANGE

PIN-PACKAGE

MAX136CPL+

0°C to +70°C

40 PDIP

MAX136CMH+

0°C to +70°C

44 MQFP

MAX136CQH+

0°C to +70°C

44 PLCC

MAX136C/D

0°C to +70°C

Dice

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-0890; Rev 1; 11/12