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TC7126 Datasheet(PDF) 17 Page - Microchip Technology

Part # TC7126
Description  3-1/2 Digit Analog-to-Digital Converters
PDF  26 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7126 Datasheet(HTML) 17 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21458C-page 17
TC7126/A
The display will over range for RUNKNOWN ≥ 2 x
RSTANDARD (see Figure 8-2).
FIGURE 8-2:
Low Parts Count
Ratiometric Resistance Measurement
FIGURE 8-3:
3-1/2 Digit True RMS AC DMM
VREF+
VREF-
VIN+
VIN-
ANALOG
COMMON
TC7126A
LCD
RSTANDARD
RUNKNOWN
V+
8
14
7
13
12
11
10
9
1
2
3
4
5
6
TC7126A
9V
VIN
9M
Ω
900k
Ω
90k
Ω
10k
Ω
2V
20V
200V
200mV
1N4148
10M
Ω
1M
Ω
0.02
μF
1M
Ω 10%
47k
Ω
1
Ω
10%
20k
Ω
10%
6.8
μF
1
μF
COM
C1 = 3pF to 10pF, Variable
C2 = 132pF, Variable
+
+
AD636
2.2
μF
0.01
μF
10k
Ω
240k
Ω
Segment
Drive
LCD
39
40
28
27
38
29
26
1
35
32
31
30
26
36
BP
V+
V-
VREF+
VREF-
ANALOG
COMMON
V IN+
VOUT+
V-
C1
C2



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