MAX133CQH+D by Analog Devices

3¾ Digit DMM Circuit


The MAX133 and MAX134 are integrating A/D converters for 3¾ digit multimeters and data acquisition systems such as data loggers and weigh scales. The A/D's internal resolution is ±40,000 counts. An extra digit is supplied as a guard digit to allow autozero or tare of a 4000 count displayed reading to 1/10 of a displayed count. The conversion time is 50ms. The MAX133 and MAX134 differ only in their microprocessor interface. The MAX133 has a 4 bit multiplexed address/data bus while the MAX134 has 3 separate address lines and a 4 bit bidirectional data bus. Both devices can be used with 4, 8, and 16 bit microprocessors. When controlled by a microprocessor, the MAX133 and MAX134 can perform auto-ranging measurements from ±400.0mV to ±4000V full scale. External attenuator resistors are required, but range switching is performed by the A/D. The power supply is typically a 9V battery or ±5V. Operating current is typically 100µA while standby current is only 25µA.

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Prices starting from US$19.13

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Features

40,000 Count Resolution
0.025% Accuracy
20 Conversions per Second
Microprocessor Interface
100µA Operating Supply Current
Low External Component Count
5µV Resolution
Demonstration Kit Available MAX134/DEMO

Specifications

Resolution (±Counts) 4000
# Input Channels 1
Conv. Rate (ksps) (max) 0.02
Data Bus µP/4
Diff/S.E. Input Diff. Only
External VREF (V) (min) 0
External VREF (V) (max) 6
Unipolar VIN (V) (max) 6
DNL (±LSB) 0.2
INL (±LSB) 16
Package/Pins MQFP/44PDIP/40PLCC/44
BudgetaryPrice (See Notes) 16.58


MAX133CQH+D Data & Signal Conversion by Analog Devices

ADC 3.75DIGIT DMM CIRCUIT PLCC-44

Status: Unknown
Series: LCD/LED Display ADCs
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Resolution (Bits) -
Sampling Rate 20SPS
Input Channel Type Differential
Data Interface Parallel
Supply Voltage Type Dual (+/-)
Supply Voltage Min 0V
Supply Voltage Max 9V
ADC / DAC Case Style PLCC
No. of Pins 44Pins
Operating Temperature Min 0°C
Operating Temperature Max 70°C
Product Range LCD/LED Display ADCs
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 3 - 168 hours
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

9V, 3 3/4 Digit DMM Circuit | Analog Devices
Adc, 3.75Digit Dmm Circuit, Plcc-44 | Newark Electronics
ADC, 3.75DIGIT DMM CIRCUIT, PLCC-44 | element14

Frequently Asked Questions

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Is the MAX133CQH+D RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Analog Devices, Newark Electronics, element14 and Farnell have stock available or on a lead time for MAX133CQH+D .

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