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參數(shù)資料
| 型號： | TC811 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs |
| 中文描述： | 3-1/2數(shù)字模擬到數(shù)字轉(zhuǎn)換器與保持和差分基準輸入 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | TC811 |
3-147
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
3-1/2 DIGIT A/D CONVERTER WITH HOLD AND
DIFFERENTIAL REFERENCE INPUTS
TC811
Liquid Crystal Display Sources
Several LCD manufactures supply standard LCD dis-
plays to interface with the TC811 3-1/2 digit analog-to-digital
converter.
Figure 10. TC811 Internal Voltage Reference Connection
Figure 11. Low Parts Count Ratio Metric Resistance Measurement
Representative
Part Numbers
*
Manufacturer
Address/Phone
Crystaloid
Electronics
5282 Hudson Dr.,
Hudson, OH 44236
216-655-2429
770 Airport Blvd.,
Burlingame, CA 94010
415-347-9916
3415 Kashikawa St.,
Torrence, CA 90505
212-534-0360
612 E. Lake St.,
Lake Mills, WI 53551
414-648-2361
C5335, H5535,
T5135, SX440
AND
FE 0801,
FE 0203
EPSON
LD-B709BZ
LD-H7992AZ
Hamlin, Inc.
3902, 3933, 3903
*
NOTE:
Contact LCD manufacturer for full product listing/specifications.
V
REF
V
REF
+
–
V
IN
+
V
IN
ANALOG
COMMON
–
TC811
LCD
R
STANDARD
R
UNKNOWN
V+
HLDR
V–
ANALOG
COMMON
TC811
V+
32
33
36
26
240k
10k
V–
VREF
38
+
9V
SET VREF = 1/2 VFULL SCALE
V+
Oscillator Crystal Source
Representative
Part Numbers
Manufacturer
Address/Phone
STATEK
512 N-Main
Orange, CA 92668
714-639-7810
CX-1V 40.0
Ratiometric Resistance Measurements
The TC811 true differential input and differential refer-
ence 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 is passed through the pair (Figure
11). The voltage developed across the unknown is applied
to the input and the voltage across the known resistor
applied to the reference input. If the unknown equals the
standard, the input voltage will equal the reference voltage
and the display will read 1000. The displayed reading can be
determined from the following expression:
Displayed reading =
x 1000
The display will overrange for R
UNKNOWN
≥
2 X
R
STANDARD
.
R
UNKNOWN
R
STANDARD
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