TC7126 TelCom, TC7126 Datasheet - Page 11

• Manufacturer Part Number: TC7126
• Description: 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
• Manufacturer: TelCom

3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
Manufacturer
Crystaloid
Electronics
AND
VGI, Inc.
Hamlin, Inc.
*
Decimal Point and Annunciator Drive
digital logic supply ground through a 500
TEST pin may be used as the negative supply for external
CMOS gate segment drivers. LCD annunciators for decimal
points, low battery indication, or function indication may be
added without adding an additional supply. No more than 1
mA should be supplied by the TEST pin: its potential is
approximately 5V below V
APPLICATIONS INFORMATION
Liquid Crystal Display Sources
face with the TC7126A 3-1/2 digit analog-to-digital con-
verter.
NOTE: Contact LCD manufacturer for full product listing/specifications.
The TEST pin is connected to the internally-generated
Several manufacturers supply standard LCDs to inter-
TELCOM SEMICONDUCTOR, INC.
Figure 7. Analog Common Temperature Coefficient
200
180
160
140
120
100
80
60
40
20
0
GUARANTEED
MAXIMUM
Address/Phone
5282 Hudson Dr.,
Hudson, OH 44236
216-655-2429
720 Palomar Avenue
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
TC7126A
TYPICAL
+
.
SPECIFIED
MAXIMUM
TYPICAL
ICL7126
NO
Representative
Part Numbers
C5335, H5535,
T5135, SX440
FE 0801,
FE 0203
I1048, I1126
3902, 3933, 3903
SPECIFIED
MAXIMUM
TYPICAL
ICL7136
NO
resistor. The
*
Flat Package
lead flat package. A test socket for the TC7126ACBQ device
is available:
Ratiometric Resistance Measurements
reference make ratiometric readings possible. In ratiometric
operation, an unknown resistance is measured with respect
to a known standard resistance. No accurately-defined
reference voltage is needed.
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 applied to the refer-
ence input. If the unknown equals the standard, the display
will read 1000. The displayed reading can be determined
from the following expression:
The display will overrange for R
2
R
The TC7126A is available in an epoxy 64-pin formed-
Part No.
Manufacturer: Yamaichi
Distribution:
The TC7126A's true differential input and differential
The unknown resistance is put in series with a known
Displayed reading =
Figure 8. TC7126A Internal Voltage Reference Connection
STANDARD
26
V –
.
SET V REF = 1/2 V FULL SCALE
TC7126A
IC 51-42
Nepenthe Distribution
2471 East Bayshore
Suite 520
Palo Alto, CA 94043
[phone]
COMMON
9V
ANALOG
+
V REF
V REF
+
–
R
R
V +
STANDARD
UNKNOWN
1
36
35
32
V REF
UNKNOWN
1000.
240 k
10 k
TC7126A
TC7126
3-227
1
2
3
4
5
6
7
8