參數(shù)資料
型號(hào)： TC7126RCPL
廠商： Microchip Technology Inc.
元件分類： 顯示驅(qū)動(dòng)器
英文描述： 3-1/2 Digit Analog-to-Digital Converters
中文描述： 3-1/2數(shù)字模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 11/13頁(yè)
文件大?。?/td> 198K
代理商： TC7126RCPL
3-227
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
TC7126
TC7126A
TYPICAL
GUARANTEED
MAXIMUM
TYPICAL
TYPICAL
200
180
160
140
120
100
80
60
40
20
0
A
T
TC7126A
ICL7136
NO
MAXIMUM
SPECIFIED
NO
MAXIMUM
SPECIFIED
ICL7126
Figure 8. TC7126A Internal Voltage Reference Connection
Figure 7. Analog Common Temperature Coefficient
APPLICATIONS INFORMATION
Liquid Crystal Display Sources
Several manufacturers supply standard LCDs to inter-
face with the TC7126A 3-1/2 digit analog-to-digital con-
verter.
Decimal Point and Annunciator Drive
The TEST pin is connected to the internally-generated
digital logic supply ground through a 500
resistor. The
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
+
.
Flat Package
The TC7126A is available in an epoxy 64-pin formed-
lead flat package. A test socket for the TC7126ACBQ device
is available:
Part No.
Manufacturer: Yamaichi
Distribution:
IC 51-42
Nepenthe Distribution
2471 East Bayshore
Suite 520
Palo Alto, CA 94043
(415) 856-9332
Ratiometric Resistance Measurements
The TC7126A's true differential input and differential
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.
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 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:
Displayed reading =
1000.
R
STANDARD
The display will overrange for R
UNKNOWN
≥
2
3
R
STANDARD
.
R
UNKNOWN
V–
ANALOG
COMMON
TC7126A
V+
32
35
36
26
240 k
10 k
V–
VREF
1
+
9V
SET VREF = 1/2 VFULL SCALE
V+
Representative
Part Numbers
*
Manufacturer
Address/Phone
Crystaloid
Electronics
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
C5335, H5535,
T5135, SX440
AND
FE 0801,
FE 0203
VGI, Inc.
I1048, I1126
Hamlin, Inc.
3902, 3933, 3903
*
NOTE:
Contact LCD manufacturer for full product listing/specifications.
相關(guān)PDF資料
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