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TC14433
TC14433A
3-1/2 DIGIT A/D CONVERTERS
FEATURES
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Accuracy ...................
±
0.05% of Reading
±
1 Count
Two Voltage Ranges ............. 1.999V and 199.9 mV
Up to 25 Conversions Per Second
Z
IN
> 1000M Ohms
Single Positive Voltage Reference
Auto-Polarity and Auto-Zero
Overrange and Underrange Signals Available
Operates in Auto-Ranging Circuits
Uses On-Chip System Clock or External Clock
Wide Supply Range .................... e.g.,
±
4.5V to
±
8V
Package Available .................................. 24-Pin DIP
24-Pin CerDIP, 28-Pin SOIC and 28-Pin PLCC
GENERAL DESCRIPTION
The TC14433 is a low power, high-performance, mono-
lithic CMOS 3-1/2 digit A/D converter. The TC14433 com-
bines 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.
The TC14433 will interface with the TC7211A LCD
display driver.
The TC14433A features improved performance over
the industry standard TC14433. Rollover, which is the
measurement of identical positive and negative signals, is
guaranteed to have the same reading within one count for
the TC14433A. Power consumption of the TC14433A is
typically 4 mW, approximately one-half that of the industry
standard TC14433.
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APPLICATIONS
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Portable Instruments
Digital Voltmeters
Digital Panel Meters
Digital Scales
Digital Thermometers
Remote A/D Sensing Systems
MPU Systems
See Application Notes 19 and 21
ORDERING INFORMATION
Part No.
TC14433AEJG
TC14433AELI
TC14433AEPG
TC14433COG
TC14433EJG
TC14433ELI
TC14433EPG
Package
24-Pin CerDIP
28-Pin PLCC
24-Pin Plastic DIP
24-Pin SOIC
24-Pin CerDIP
28-Pin PLCC
24-Pin Plastic DIP
Temp.Range
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
0°C to +70°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
FUNCTIONAL BLOCK DIAGRAM
20–23
MULTIPLEXER
Q
0
–Q
3
BCD DATA
DS
1
–DS
4
DIGIT STROBE
R
C
10
CLK1
11
CLK0
CLOCK
1'S
16–19
LATCHES
POLARITY DETECT
10'S
100'S
1,000'S
OVERFLOW
2
1
3
8
CO
2
OFFSET
15
OR
OVERRANGE
CONTROL
LOGIC
4
R
1
DISPLAY
END OF
UPDATE 9 14 CONVERSION
DU
EOC
5
R
1
/ C
1
CMOS
ANALOG
SUBSYSTEM
6
C
1
7
CO
1
V
REF
REFERENCE VOLTAGE
V
AG
ANALOG GROUND
V
X
ANALOG INPUT
V
DD
= PIN 24
V
SS
= PIN 13
V
EE
= PIN 12
INTEGRATOR
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TC14433/A-6 10/21/96
TELCOM SEMICONDUCTOR, INC.
3-127
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
