3-1/2 DIGIT A/D CONVERTERS
TC14433
TC14433A
0.1
µF
470k
0.1
µF
–V
C
14024B
R
1
+V
27k
TC04
20k
R
1
/C
1
C
1
DS
4
DS
3
V
AG
DS
2
DS
1
Q
0
TC14433
Q
1
Q
2
V
REF
Q
3
R
C
V
DD
V
SS
V
EE
EOC DU R
C
C0 2
+V
–V
300k
14070B 1/4
+V
C0 1
V
x
R
1
2
3
4
14013B
D
CR
Q
Q
1/4 14070B
1/2 DIGIT
R
14013B
D
CR
Q
RQ
PLUS
SIGN
–V 1/4 14070B
MINUS
SIGN
BI D C B A Ph LD
+V
14543B
–V
g f e d c b a
BI D C B A Ph LD
14543B
g f e d c b a
+V
+V
–V
BI D C B A Ph LD
14543B
g f e d c b a
+V
–V
+V
5
Figure 11. 3-1/2 Digit Voltmeter with LCD Display
6
≈
16,400 CLOCK CYCLES
BETWEEN EOC PULSES
EOC
1/2 CLOCK CYCLE
DS
1
1/2 DIGIT
(MSD)
2 CLOCK
CYCLES
18 CLOCK CYCLES
7
DS
2
DS
3
DS
4
(LSD)
Figure 12. Digit Select Timing Diagram
8
3-133
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
