TC7126 TelCom, TC7126 Datasheet - Page 12

• Manufacturer Part Number: TC7126
• Description: 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
• Manufacturer: TelCom

TC7126
TC7126A
3-228
V IN
900 k
90 k
10 k
9 M
TC7126A
TC7126A
Simple Inverter for Fixed Decimal Point
TEST
COM
V +
Figure 9. Decimal Point and Annunciator Drives
V +
TEST
Multiple Decimal Point or
BP
BP
or Display Annunciator
200V
20V
C1
C2
2V
Annunciator Driver
C1 = 3 pF TO 10 pF, VARIABLE
C2 = 132 pF, VARIABLE
200 mV
21
37
DECIMAL
SELECT
POINT
1N4148
0.02
µF
47 k
10%
1W
4049
GND
V +
4030
1 M
V +
GND
10 M
6.8 µF
20 k
10%
Figure 11. 3-1/2 Digit True RMS AC DMM
TO LCD
DECIMAL
POINT
TO
BACKPLANE
+
1 µF
TO LCD
DECIMAL
POINTS
+
1
2
3
4
5
6
7
AD636
Figure 10. Low Parts Count Ratiometric Resistance Measurement
ANALOG-TO-DIGITAL CONVERTERS
R
UNKNOWN
R
STANDARD
14
13
12
11
10
9
8
2.2
µF
1 M 10%
240 k
10 k
SEGMENT
TELCOM SEMICONDUCTOR, INC.
0.01
µF
V
V
V
ANALOG
COMMON
DRIVE
V
REF
+
–
REF
+
IN
IN
–
36
35
32
31
30
26
1
TC7126A
9V
V +
V
V
V – REF
ANALOG
COMMON
V + IN
V
V
REF
OUT
+
+
+
–
TC7126A
V
LCD
26
–
3-1/2 DIGIT
BP
27
29
28
40
38
39
LCD