DSTEMPCKW713 datasheet, PDF - EEWORLD Datasheet

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DSTEMPCKW713: Description4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers; File Size303KB，28 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

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4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers

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TC7129

4-1/2 Digit Analog-to-Digital Converters with

On-Chip LCD Drivers

Features:

•

Count Resolution: ±19,999

Resolution on 200 mV Scale: 10

V

True Differential Input and Reference

Low Power Consumption: 500

A

at 9V

Direct LCD Driver for 4-1/2 Digits, Decimal Points,

Low Battery Indicator, and Continuity Indicator

Overrange and Underrange Outputs

Range Select Input: 10:1

High Common Mode Rejection Ratio: 110 dB

External Phase Compensation Not Required

General Description:

The TC7129 is a 4-1/2 digit Analog-to-Digital Converter

(ADC) that directly drives a multiplexed Liquid Crystal

Display (LCD). Fabricated in high-performance, low-

power CMOS, the TC7129 ADC is designed specifi-

cally for high-resolution, battery-powered digital multi-

meter applications. The traditional dual-slope method

of A/D conversion has been enhanced with a succes-

sive integration technique to produce readings accu-

rate to better than 0.005% of full-scale and resolution

down to 10

V

per count.

The TC7129 includes features important to multimeter

applications. It detects and indicates low battery condi-

tion. A continuity output drives an annunciator on the

display and can be used with an external driver to sound

an audible alarm. Overrange and underrange outputs,

along with a range-change input, provide the ability to

create auto-ranging instruments. For snapshot read-

ings, the TC7129 includes a latch-and-hold input to

freeze the present reading. This combination of features

makes the TC7129 the ideal choice for full-featured

multimeter and digital measurement applications.

Applications:

• Full-Featured Multimeters

• Digital Measurement Devices

Device Selection Table

Package

Code

TC7129CPL

TC7129CKW

TC7129CLW

Layout

Normal

Formed

–

Package

40-Pin PDIP

44-Pin PQFP

44-Pin PLCC

Temperature

Range

0C to +70C

Typical Application

Low Battery

Continuity

V+

5 pF

20 19 18 17 16 15 14 13 12 11 10

TC7129

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

120 kHz

330 kΩ

0.1 µF

1 µF

150 kΩ

0.1

µF

10 pF

kΩ

0.1 µF

V+

10 kΩ

–

100 kΩ

*Note:

RC network between pins 26 and 28 is not required.



2002-2012 Microchip Technology Inc.

DS21459E-page 1

DSTEMPCKW713 Related Products

	DSTEMPCKW713	DSTEMPCLW	TC7129_13
Description	4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers	4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers	4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers

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