3-1/2 DIGIT A/D CONVERTERS
TC14433
TC14433A
470k 0.1µF 0.1µF
1
+5V V
X
27kΩ
TC04
INPUT
100kΩ
R
1
R
1
/C
1
C
1
C0
1
C0
2
V
X
CLK1
V
CLK0
AG
DU
OR
Q
0
EOC
Q
1
TC14433
V
REF
Q
2
V
SS
V
DD
V
EE
DS
4
DS
3
DS
2
DS
1
300k
RESISTOR
NETWORK
OR
INDIVIDUAL
RESISTOR*
A B1 a
b
B
c
C
D I4511B d
e
LT
f
LE
g
V
SS
V
DD
R
DP
R
M
R
2
3
COMMON
CATHODE
LED DISPLAY
+5V
For V
REF
= 2000V
V : 1.999V full scale
For V
REF
= 200 mV
V : 199.9 mV full scale
(change 470k to R = 27k
and decimal point position)
Peak digit current for an eight
displayed is 7 times the segment
current.
*To increase segment current
capability add two 75491 ICs
between 14511B and Resistor
Network. The use of the 1413
as digit driver increases digit
current capability over the 75492.
**V can range between –2.8 and
–11V.
V
EE**
(MINUS)
+5V
MINUS
CONTROL
75492
OR
1413*
DIGIT DRIVERS
4
5
6
7
ALTERNATE OVERRANGE CIRCUIT
WITH SEPARATED LED
R
R
1/6 75492
OR
+5V
OR
1/7 1413
Figure 14. 3-1/2 Digit Voltmeter with Low Component Count Using Common Cathode Displays
8
TELCOM SEMICONDUCTOR, INC.
3-135
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
