tc7126a Microchip Technology Inc., tc7126a Datasheet - Page 17

• Manufacturer Part Number: tc7126a
• Description: 3-1/2 Digit Analog-to-digital Converters
• Manufacturer: Microchip Technology Inc.

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