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PDF MAX136 Data sheet ( Hoja de datos )
| Número de pieza | MAX136 | |
| Descripción | Digit A/D Converter | |
| Fabricantes | Maxim Integrated | |
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MAX136
Low Power, 31⁄2 Digit A/D Converter
with Display Hold
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:
Pressure
Voltage
Resistance
Temperature
Conductance
Current
Speed
Material Thickness
Typical Operating Circuit
Features
• Power Dissipation Guaranteed Less than 1mW–9V
Battery Life 3000 Hours Typical
• Hold Pin Allows Indefinite Display Hold
• Guaranteed First Reading Recovery from
Overrange
• On-Board Display Drive Capability—No External
Circuitry Required
• High-Impedance CMOS Differential Inputs
• Low Noise(< 15µVP-P) Without Hysteresis or
Overrange Hangover
• Clock and Reference On-Chip
• Zero Input Gives Zero Reading
• True Polarity Indication for Precision Null
Applications
• Key Parameters Guaranteed Over Temperature
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX136CPL+
MAX136CMH+
MAX136CQH+
0°C to +70°C
0°C to +70°C
0°C to +70°C
40 PDIP
44 MQFP
44 PLCC
MAX136C/D
0°C to +70°C Dice
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configurations
ANALOG
INPUT
LCD DISPLAY
MAX136
VREF
9V
TO ANALOG
COMMON (P32)
(Detailed Circuit Diagram—See 3rd page)
Pin Configurations continued at end of data sheet
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
1 page  
MAX136
Low Power, 31⁄2 Digit A/D Converter
with Display Hold
Revision History
REVISION
NUMBER
0
1
REVISION
DATE
2/87
11/12
DESCRIPTION
Initial release
Add MQFP package to Ordering Information and Package Information.
PAGES
CHANGED
—
1, 4
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
5
© 2012 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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