TC7116
TC7116A
TC7117
TC7117A
PIN DESCRIPTION
(Cont.)
40-Pin CerDIP
40-Pin PDIP
Pin Number
Normal
33
34
3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD
44-Pin
Plastic Quad
Flat Package
Pin Number
41
42
Symbol
C
–
REF
+
C
REF
Description
See pin 34.
A 0.1
µF
capacitor is used in most applications. If a
–
large, common-mode voltage exists (e.g., the V
IN
pin is
not at analog common), and a 200 mV scale is used, a 1
µF
capacitor is recommended and will hold the roll-over
error to 0.5 count.
Positive power supply voltage.
The analog input required to generate a full-scale output
(1999 counts). Place 100 mV between pins 32 and 36
for 199.9 mV full scale. Place 1V between pins 32 and
36 for 2V full scale. See paragraph on Reference
Voltage.
Lamp test. When pulled HIGH (to V
+
), all segments will
be turned on and the display should read –1888. It may
also be used as a negative supply for externally-
generated decimal points. See Test paragraph for more
details.
See pin 40.
See pin 40.
Pins 40, 39 and 38 make up the oscillator section. For
a 48 kHz clock (3 readings per sec), connect pin 40 to
the junction of a 100 kΩ resistor and a 100 pF capacitor.
The 100 kΩ resistor is tied to pin 39 and the 100 pF
capacitor is tied to pin 38.
35
36
43
44
V
+
V
+
REF
37
3
TEST
38
39
40
4
6
7
OSC
3
OSC
2
OSC
1
3-208
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