
5
3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD
TC7116
TC7116A
TC7117
TC7117A
PIN DESCRIPTION
Pin No.
40-Pin PDIP/
44-Pin
40-Pin CerDIP
Plastic Quad
Normal
Flat Package
Symbol
Description
1
8
HLDR
Hold pin, Logic 1 holds present display reading.
29
D1
Activates the D section of the units display.
310
C1
Activates the C section of the units display.
411
B1
Activates the B section of the units display.
512
A1
Activates the A section of the units display.
613
F1
Activates the F section of the units display.
714
G1
Activates the G section of the units display.
815
E1
Activates the E section of the units display.
916
D2
Activates the D section of the tens display.
10
17
C2
Activates the C section of the tens display.
11
18
B2
Activates the B section of the tens display.
12
19
A2
Activates the A section of the tens display.
13
20
F2
Activates the F section of the tens display.
14
21
E2
Activates the E section of the tens display.
15
22
D3
Activates the D section of the hundreds display.
16
23
B3
Activates the B section of the hundreds display.
17
24
F3
Activates the F section of the hundreds display.
18
25
E3
Activates the E section of the hundreds display.
19
26
AB4
Activates both halves of the 1 in the thousands display.
20
27
POL
Activates the negative polarity display.
21
28
BP
LCD backplane drive output (TC7116/TC7116A).
GND
Digital ground (TC7117/TC7117A).
22
29
G3
Activates the G section of the hundreds display.
23
30
A3
Activates the A section of the hundreds display.
24
31
C3
Activates the C section of the hundreds display.
25
32
G2
Activates the G section of the tens display.
26
34
V–
Negative power supply voltage.
27
35
VINT
Integrator output. Connection point for integration
capacitor. See Integration Capacitor section for
additional details.
28
36
VBUFF
Integration resistor connection. Use a 4 k
resistor for
200mV full-scale range and a 47k
resistor for 2V
full-scale range.
29
37
CAZ
The size of the auto-zero capacitor influences system
noise. Use a 0.47
F capacitor for 200mV full scale and
a 0.047
F capacitor for 2V full scale. See Auto-Zero
Capacitor paragraph for more details.
30
38
V
–
IN
The analog LOW input is connected to this pin.
31
39
V
+
IN
The analog HIGH input is connected to this pin.
32
40
COMMON
This pin is primarily used to set the analog common-
mode COMMON voltage for battery operation or in
systems where the input signal is referenced to the
power supply. See Analog Common paragraph for more
details. It also acts as a reference voltage source.