TC14433 Datasheet, PDF (2/20 Pages) TelCom Semiconductor, Inc – 3-1/2 DIGIT A/D CONVERTERS

TC14433/A
General Description
The TC14433 is a low power, high performance,
monolithic CMOS 3-1/2 digit A/D converter. The
TC14433 combines both analog and digital circuits on
a single IC, thus minimizing the number of external
components.
This dual slope A/D converter provides automatic
polarity and zero correction with the addition of two
external resistors and two capacitors. The full scale
voltage range of this ratiometric IC extends from 199.9
millivolts to 1.999 volts. The TC14433 can operate over
a wide range of power supply voltages, including
batteries and standard 5-volt supplies.
Typical Application
The TC14433A features improved performance over
the industry standard TC14433. Rollover, which is the
measurement of identical positive and negative
signals, is specified to have the same reading within
one count for the TC14433A. Power consumption of
the TC14433A is typically 4mW, approximately one-
half that of the industry standard TC14433.
The TC14433/A is available in 24-Pin PDIP, 24-Pin
CERDIP, 24-Pin SOIC (TC14433 device only), and
28-Pin PLCC packages.
MCP1525
+5V V_IN ^VOUT
V_SS
20k
1µF
-5V
+5V
+5V
+5V
300k
1µF ^RC
0.1
0.1µF
Segment
Resistors
11 10 2 12 24
1 16
150Ω (7)
V_X
3
23
4
9 7 10
1
22
2 10 6 11
R₁*
21
4
5
TC14433
20
6
13 -5V
3 11 5 12
5 12 4 13
4543B
13
14
3
2
14
15
0.1µF**
7
9
15
867
1 16
1413
8
14
0.1µF** ^{15 19 18 17 16}
-5V
-5V
Minus Sign
-5V
-5V
200Ω
MPS-A12 _{Plus Sign}
*R₁ = 470kΩ for 2V Range
R₁ = 27kΩ for 200mV Range
**Mylar Capacitor
6
5
3
DSQ
CRQ
1
2
4
8
14013B
9
11
DSQ
CRQ
13
12
-5V
51k
+5V
110Ω
Common
Anode Led
Display
50µF 0.1µF
710 14
MPS-A12
(4)
DS4 ^-5V
DS3
DS2
DS1
+5V
-5V
fgedcba
DS21394B-page 2
© 2002 Microchip Technology Inc.