TC14433 Datasheet, PDF (1/10 Pages) TelCom Semiconductor, Inc – 3-1/2 DIGIT A/D CONVERTERS

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TC14433
TC14433A
3-1/2 DIGIT A/D CONVERTERS
FEATURES
GENERAL DESCRIPTION
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s Accuracy ................... ±0.05% of Reading ±1 Count
s Two Voltage Ranges ............. 1.999V and 199.9 mV
s Up to 25 Conversions Per Second
s Z_IN > 1000M Ohms
s Single Positive Voltage Reference
s Auto-Polarity and Auto-Zero
s Overrange and Underrange Signals Available
s Operates in Auto-Ranging Circuits
s Uses On-Chip System Clock or External Clock
s Wide Supply Range .................... e.g., ±4.5V to ±8V
s Package Available .................................. 24-Pin DIP
24-Pin CerDIP, 28-Pin SOIC and 28-Pin PLCC
APPLICATIONS
s Portable Instruments
s Digital Voltmeters
s Digital Panel Meters
s Digital Scales
s Digital Thermometers
s Remote A/D Sensing Systems
s MPU Systems
s See Application Notes 19 and 21
FUNCTIONAL BLOCK DIAGRAM
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
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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
4 ^{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.
ORDERING INFORMATION
Part No.
TC14433AEJG
TC14433AELI
TC14433AEPG
TC14433COG
TC14433EJG
TC14433ELI
TC14433EPG
Package
24-Pin CerDIP
5 ^Temp.Range
– 40°C to +85°C
28-Pin PLCC
– 40°C to +85°C
24-Pin Plastic DIP – 40°C to +85°C
24-Pin SOIC
0°C to +70°C
24-Pin CerDIP
– 40°C to +85°C
28-Pin PLCC
– 40°C to +85°C
6 ^{24-Pin Plastic DIP – 40°C to +85°C}
R_C
10
11
CLK1 CLK0
MULTIPLEXER
LATCHES
20–23
16–19
Q₀ – Q₃
BCD DATA
DS₁ –DS₄
DIGIT STROBE
POLARITY DETECT
CLOCK
1'S
10'S
100'S
1,000'S
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OVERFLOW
15 _{OR OVERRANGE}
CONTROL
LOGIC
2
CMOS
ANALOG
1
SUBSYSTEM
3
4
R₁
DISPLAY
END OF
UPDATE ^{9 14} CONVERSION
DU EOC
5
6
R₁ / C₁
C₁
INTEGRATOR
7
CO₁
8
CO₂
OFFSET
V_REF REFERENCE VOLTAGE
V_AG ANALOG GROUND
V_X ANALOG INPUT
V_DD = PIN 24
V_SS = PIN 13
V_EE = PIN 12
TELCOM SEMICONDUCTOR, INC.
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TC14433/A-6 10/21/96
3-127