TC7126CPL datasheet(14/22 Pages) MICROCHIP

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TC7126/A

DS21458B-page 14

7.5

TC7126A Internal Voltage

Reference

The TC7126A's analog common voltage temperature

stability has been significantly improved (Figure 7-3).

The "A" version of the industry standard TC7126

device allows users to upgrade old systems and design

new systems, without external voltage references.

External R and C values do not need to be changed.

Figure 7-4 shows analog common supplying the

necessary voltage reference for the TC7126A.

FIGURE 7-3:

ANALOG COMMON TEMP.

COEFFICIENT

FIGURE 7-4:

TC7126A INTERNAL

VOLTAGE REFERENCE

CONNECTION

8.0

TYPICAL APPLICATIONS

8.1

Liquid Crystal Display Sources

Several manufacturers supply standard LCDs to inter-

face with the TC7126A, 3-1/2 digit analog-to-digital

converter.

Note:

Contact LCD manufacturer for full product listing/

specifications.

8.2

Decimal Point and Annunciator

Drive

The TEST pin is connected to the internally generated

digital logic supply ground through a 500

Ω resistor. The

TEST pin may be used as the negative supply for exter-

nal CMOS gate segment drivers. LCD annunciators for

decimal points, low battery indication, or function indi-

cation may be added, without adding an additional sup-

ply. No more than 1mA should be supplied by the TEST

pin; its potential is approximately 5V below V+ (see

Figure 8-1).

FIGURE 8-1:

DECIMAL POINT AND

ANNUNCIATOR DRIVES

Typical

Maximum

Typical

200

180

160

140

120

100

TC7126A

ICL7136

Maximum

Specified

Maximum

Specified

ICL7126

V-

ANALOG

COMMON

TC7126A

VREF+

240k

Ω

10k

Ω

VREF-

VREF

SET VREF = 1/2 VREF

V+

Manufacturer

Address/Phone

Representative

Part Numbers*

Crystaloid

Electronics

5282 Hudson Dr.

Hudson, OH 44236

216-655-2429

C5335, H5535,

T5135, SX440

AND

720 Palomar Ave.

Sunnyvale, CA 94086

408-523-8200

FE 0801

FE 0203

VGI, Inc.

1800 Vernon St., Ste. 2

Roseville, CA 95678

916-783-7878

LD-B709BZ

LD-H7992AZ

Hamlin, Inc.

612 E. Lake St.

Lake Mills,

WI 53551

414-648-2361

3902, 3933,

3903

TC7126A

V+

TEST

GND

4030

TC7126A

TEST

V+

GND

To LCD

Decimal

Point

To LCD

Decimal

Point

To LCD

Decimal

Point

Backplane

4049

Multiple Decimal Point or

Annunciator Driver

Simple Inverter for Fixed Decimal Point

or Display Annunciator

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