3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
PIN DESCRIPTION
Pin No.
40-Pin PDIP
(Normal)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
1
Pin No.
40-Pin PDIP
(Reverse)
(40)
(39)
(38)
(37)
(36)
(35)
(34)
(33)
(32)
(31)
(30)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
2
Symbol
V
+
D
1
C
1
B
1
A
1
F
1
G
1
E
1
D
2
C
2
B
2
A
2
F
2
E
2
D
3
B
3
F
3
E
3
AB
4
POL
BP
GND
G
3
A
3
C
3
G
2
V
–
V
INT
V
BUFF
C
AZ
Description
Positive supply voltage.
Activates the D section of the units display.
Activates the C section of the units display.
Activates the B section of the units display.
Activates the A section of the units display.
Activates the F section of the units display.
Activates the G section of the units display.
Activates the E section of the units display.
Activates the D section of the tens display.
Activates the C section of the tens display.
Activates the B section of the tens display.
Activates the A section of the tens display.
Activates the F section of the tens display.
Activates the E section of the tens display.
Activates the D section of the hundreds display.
Activates the B section of the hundreds display.
Activates the F section of the hundreds display.
Activates the E section of the hundreds display.
Activates both halves of the 1 in the thousands display.
Activates the negative polarity display.
LCD Backplane drive output (TC7106A).
Digital ground (TC7107A).
Activates the G section of the hundreds display.
Activates the A section of the hundreds display.
Activates the C section of the hundreds display.
Activates the G section of the tens display.
Negative power supply voltage.
Integrator output. Connection point for integration capacitor. See
INTEGRATING CAPACITOR section for more details
Integration resistor connection. Use a 47kΩ resistor for a 200mV full-
scale range and a 470kΩ resistor for 2V full-scale range.
The size of the auto-zero capacitor influences system noise. Use a
0.47µF capacitor for 200mV full scale, and a 0.047µF capacitor for
2V full scale. See Paragraph on AUTO-ZERO CAPACITOR for more
details.
The analog LOW input is connected to this pin.
The analog HIGH input signal is connected to this pin.
This pin is primarily used to set the analog common-mode voltage
for battery operation or in systems where the input signal is
referenced to the power supply. It also acts as a reference voltage
source. See paragraph on ANALOG COMMON for more details.
See pin 34.
3
4
5
6
7
30
31
32
(11)
(10)
(9)
V
–
IN
+
V
IN
ANALOG
COMMON
33
(8)
C
–
REF
8
TELCOM SEMICONDUCTOR, INC.
3-187
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