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參數(shù)資料
| 型號： | TC811CPL |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, ACCESS, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 145K |
| 代理商： | TC811CPL |
11
3-1/2 DIGIT ANALOG-TO-DIGITAL 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
Manufacturer
Address/Phone
Part Numbers*
Crystaloid
5282 Hudson Dr.,
C5335, H5535,
Electronics
Hudson, OH 44236
T5135, SX440
216-655-2429
AND
770 Airport Blvd.,
FE 0801,
Burlingame, CA 94010
FE 0203
415-347-9916
EPSON
3415 Kashikawa St.,
LD-B709BZ
Torrence, CA 90505
LD-H7992AZ
212-534-0360
Hamlin, Inc.
612 E. Lake St.,
3902, 3933, 3903
Lake Mills, WI 53551
414-648-2361
*NOTE: Contact LCD manufacturer for full product listing/specifications.
VREF
+
VREF
–
VIN
+
VIN
–
ANALOG
COMMON
TC811
LCD
RSTANDARD
RUNKNOWN
V
+
HLDR
V
–
ANALOG
COMMON
TC811
VREF
+
32
33
36
26
240k
10k
VREF
–
VREF
38
+
9V
SET VREF = 1/2 VFULL SCALE
V
+
Oscillator Crystal Source
Representative
Manufacturer
Address/Phone
Part Numbers
STATEK
512 N-Main
CX-1V 40.0
Orange, CA 92668
714-639-7810
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 RUNKNOWN ≥ 2 X
RSTANDARD.
RUNKNOWN
RSTANDARD
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