參數(shù)資料
型號(hào)： TC7107IJL
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, CDIP40
封裝： CERDIP-40
文件頁數(shù)： 10/26頁
文件大?。?/td> 623K
代理商： TC7107IJL
TC7106/A/TC7107/A
DS21455B-page 18
2002 Microchip Technology Inc.
10.4
Ratiometric Resistance
Measurements
The true differential input and differential reference
make ratiometric reading possible. Typically in a ratio-
metric operation, an unknown resistance is measured,
with respect to a known standard resistance. No accu-
rately 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:
The display will over range for:
RUNKNOWN ≥ 2xRSTANDARD
FIGURE 10-2:
LOW PARTS COUNT
RATIOMETRIC
RESISTANCE
MEASUREMENT
FIGURE 10-3:
TEMPERATURE SENSOR
FIGURE 10-4:
POSITIVE TEMPERATURE
COEFFICIENT RESISTOR
TEMPERATURE SENSOR
FIGURE 10-5:
TC7106A, USING THE
INTERNAL REFERENCE:
200mV FULL SCALE, 3
READINGS-PER-SECOND
(RPS)
Displayed Reading
()
RUnknown
RS
dard
tan
-------------------------------x1000
=
VREF+
VREF-
VIN+
VIN-
Analog
Common
TC7106A
LCD Display
RSTANDARD
RUNKNOWN
V+
V-
VIN-
VIN+
VREF+
VREF-
Common
50k
R2
160k
300k
300k
R1
50k
1N4148
Sensor
9V
+
TC7106A
VFS = 2V
TC7106A
V+
V-
VIN-
VIN+
VREF+
VREF-
Common
5.6k
160k
R2
20k
1N914
9V
R1
20k
+
R3
0.7%/
°C
PTC
100k
100pF
0.47
F
47k
0.22
F
To Display
To Backplane
0.1
F
21
1k
22k
9V
Set VREF = 100mV
TC7106A
0.01
F
+
IN
1M
–
To Pin 1
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
+
–
相關(guān)PDF資料
PDF描述
TC7106ACLW 1-CH DUAL-SLOPE ADC, PQCC44
TC7106AIJL 1-CH DUAL-SLOPE ADC, CDIP40
TC7107ACKWG 1-CH DUAL-SLOPE ADC, PQFP44
TC7106ACKW 1-CH DUAL-SLOPE ADC, PQFP44
TC7106CLW 1-CH DUAL-SLOPE ADC, PQCC44
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