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參數(shù)資料
| 型號： | TC7107ACLW |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 623K |
| 代理商： | TC7107ACLW |
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%/
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
+
–
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC7107ACLW713 | 功能描述:LED顯示驅(qū)動器 w/LED Driver RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TC7107ACPL | 功能描述:LED顯示驅(qū)動器 w/LED Driver RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TC7107ACPL | 制造商:Microchip Technology Inc 功能描述:IC ADC 3.5BIT DIP-40 |
| TC7107AIJL | 功能描述:LED顯示驅(qū)動器 3-1/2 Digit A/D w/ LED Driver RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TC7107AIPL | 功能描述:LED顯示驅(qū)動器 w/LED Driver RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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