TC7129CKW datasheet(1/28 Pages) MICROCHIP

No. de pieza	TC7129CKW

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

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Fabricante Electrónico	MICROCHIP [Microchip Technology]

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 2002-2012 Microchip Technology Inc.

DS21459E-page 1

TC7129

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

Applications:

• Full-Featured Multimeters

• Digital Measurement Devices

Device Selection Table

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.

Typical Application

Package

Code

Layout

Package

Temperature

Range

TC7129CPL

Normal

40-Pin PDIP

0

C to +70C

TC7129CKW

Formed

44-Pin PQFP

0

C to +70C

TC7129CLW

–

44-Pin PLCC

0

C to +70C

TC7129

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

9V

+

Low Battery

Continuity

V+

5 pF

120 kHz

10 pF

0.1 µF

20

k

Ω

0.1

µF

100 k

Ω

1 µF

0.1 µF

150 k

Ω

10 k

Ω

V+

VIN

–

+

*

*N

ote: RC network between pins 26 and 28 is not required.

330 k

Ω

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

On-Chip LCD Drivers

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