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TC7126CPL

3-1/2 Digit Analog-to-Digital Converters

Microchip Technology 

TC7126/A

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.

Manufacturer

Address/Phone

Representative

Part Numbers*

Crystaloid

Electronics

AND

VGI, Inc.

Hamlin, Inc.

5282 Hudson Dr.

Hudson, OH 44236

216-655-2429

720 Palomar Ave.

Sunnyvale, CA 94086

408-523-8200

1800 Vernon St., Ste. 2

Roseville, CA 95678

916-783-7878

612 E. Lake St.

Lake Mills,

WI 53551

414-648-2361

C5335, H5535,

T5135, SX440

FE 0801

FE 0203

LD-B709BZ

LD-H7992AZ

3902, 3933,

3903

Note:

Contact LCD manufacturer for full product list-

ing/specifications.

8.2 Decimal Point and Annunciator

Drive

The TEST pin is connected to the internally generated

digital logic supply ground through a 500Ω 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 ).

Simple Inverter for Fixed Decimal Point

or Display Annunciator

V+

V+

TC7126A

BP 21

4049

TEST 37

GND

Multiple Decimal Point or

Annunciator Driver

To LCD

Decimal

Point

To

Backplane

V+

V+ BP

TC7126A

To LCD

Decimal

Point

To LCD

Decimal

Point

TEST

4030

GND

FIGURE 8-1:

Decimal Point and

Annunciator Drives

8.3 Flat Package

The TC7126 is available in an epoxy 64-pin formed

lead package. A test socket for the TC7126ACBQ

device is available:

Part Number:

Manufacturer:

Distribution:

IC 51-42

Yamaichi

Nepenthe Distribution

2471 East Bayshore, Ste. 520

Palo Alto, CA 94043

(650) 856-9332

8.4 Ratiometric Resistance

Measurements

The TC7126A’s true differential input and differential

reference make ratiometric reading possible. In a ratio-

metric operation, an unknown resistance is measured

with respect to a known standard resistance. No

accurately defined reference voltage is needed.

The unknown resistance is put in series with a known

standard and a current passed through the pair. The

voltage developed across the unknown is applied to the

input and the voltage across the known resistor is

applied to the reference input. If the unknown equals

the standard, the display will read 1000. The displayed

reading can be determined from the following

expression:

EQUATION 8-1:

Displayed (Reading) =

RUNKNOWN

RSTANDARD

x 1000

DS21458C-page 16

© 2006 Microchip Technology Inc.

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