TelCom Semiconductor Inc TC14433EJG, TC14433ELI, TC14433COG, TC14433AEPG, TC14433EPG Datasheet
...
3-1/2 DIGIT A/D CONVERTERS
1
TC14433
TC14433A
FEATURES
■ Accuracy ...................±0.05% of Reading ±1 Count
■ Two Voltage Ranges .............1.999V and 199.9 mV
■ Up to 25 Conversions Per Second
■ ZIN > 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
APPLICATIONS
■ Portable Instruments
■ Digital Voltmeters
■ Digital Panel Meters
■ Digital Scales
■ Digital Thermometers
■ Remote A/D Sensing Systems
■ MPU Systems
■ See Application Notes 19 and 21
FUNCTIONAL BLOCK DIAGRAM
R
C
10
CLK111CLK0
MULTIPLEXER
LATCHES
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 dualslope 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.
ORDERING INFORMATION
Part No. Package Temp.Range
TC14433AEJG 24-Pin CerDIP – 40°C to +85°C
TC14433AELI 28-Pin PLCC – 40°C to +85°C
TC14433AEPG 24-Pin Plastic DIP – 40°C to +85°C
TC14433COG 24-Pin SOIC 0°C to +70°C
TC14433EJG 24-Pin CerDIP – 40°C to +85°C
TC14433ELI 28-Pin PLCC – 40°C to +85°C
TC14433EPG 24-Pin Plastic DIP – 40°C to +85°C
20–23
Q
0–Q3
BCD DATA
16–19
–DS
DS
1
4
DIGIT STROBE
POLARITY DETECT
2
3
4
5
6
1'S
DISPLAY
UPDATE
TELCOM SEMICONDUCTOR, INC.
CONTROL
LOGIC
14
9
DU
EOC
10'S 100'S 1,000'SCLOCK
END OF
CONVERSION
OVERFLOW
CMOS
ANALOG
SUBSYSTEM
456
R
R1C1/
1
INTEGRATOR
C
1
78
CO1CO
OFFSET
7
15
OVERRANGE
OR
2
1
3
2
REFERENCE VOLTAGE
V
REF
ANALOG GROUND
V
AG
V
ANALOG INPUT
X
= PIN 24
V
DD
V
= PIN 13
SS
V
= PIN 12
EE
8
TC14433/A-6 10/21/96
3-127
TC14433
TC14433A
3-1/2 DIGIT A/D CONVERTERS
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VDD – VEE) ...................... – 0.5V to +18V
Voltage on Any Pin,
Reference to VEE.......................– 0.5V to (VDD + 0.5)
DC Current, Any Pin.............................................. ±10mA
Operating Temperature Range ...............– 40°C to +85°C
Power Dissipation (TA < 70°C)
SOIC................................................................940mW
CerDIP...............................................................1.45W
Storage Temperature Range ................– 65°C to +160°C
Lead Temperature (Soldering, 10 sec) .................+300°C
*This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operation sections of
the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Plastic PLCC .......................................................1.0W
Plastic DIP.......................................................940mW
ELECTRICAL CHARACTERISTICS: V
= +5V, VEE = – 5V, C1 = 0.1µF (mylar), CO = 0.1µF, RC = 300kΩ, R1 =
DD
470kΩ @ V
= 2V, R1 = 27kΩ @ V
REF
= 200mV, unless otherwise specified.
REF
TA = +25°C– 40°C < TA < +85°C
Symbol Parameter Test Conditions Min Typ Max Min Typ Max Unit
Analog Input
SYE Rollover Error (Positive 200mV Full Scale V
and Negative Full –V
= +V
IN
IN
IN
Scale Symmetry
NL Linearity Output V
Reading (Note 1) V
SOR Stability Output Reading VX = 1.99V, V
(Note 2) VX = 199mV, V
ZOR Zero Output Reading VX = 0V, V
I
IN
Bias Current:
= 2V – 0.05 +0.05 +0.05 — — — %rdg
REF
= 200mV – 1 count — +1 count — — —
REF
= 2V — — 2 — — — LSD
REF
= 200mV — — 3 — — —
REF
= 2V — 0 0 — — — LSD
REF
Analog Input — ±20 ±100 — — — pA
Reference Input — ±20 ±100 — — —
Analog Ground — ±20 ±500 — — —
CMRR Common-Mode Rejection V
= 1.4V, V
X
= 2V, — 65 — — — — dB
REF
fOC = 32kHz
Digital
V
OL
Output Voltage VSS = 0V, "0" Level — 0 0.05 — — 0.05 V
Pins 14 to 23 (Note 3) VSS = – 5V, "0" Level — – 5 –4.95 — — – 4.95
V
OH
Output Voltage VSS = 0V, "1" Level 4.95 5 — 4.95 — — V
Pins 14 to 23 (Note 3) VSS = – 5V, "1" Level 4.95 5 — 4.95 — —
I
OH
Output Current VSS = 0V, VOH = 4.6V Source – 0.2 – 0.36 — – 0.14 — — mA
Pins 14 to 23 VSS = – 5V, VOH = 5V Source – 0.5 – 0.9 — – 0.35 — —
I
OL
Output Current VSS = 0V, VOL = 0.4V Sink 0.51 0.88 — 0.36 — — mA
Pins 14 to 23 VSS = – 5V, VOL = – 4.5V Sink 1.3 2.25 — 0.9 — —
f
CLK
Clock Frequency RC = 300kΩ — 66 — ———kHz
IDUInput Current – DU —
Power
I
Q
Quiescent Current VDD to VEE, ISS = 0, 14433A:
= 5, VEE = – 5 — 0.4 2 — — 3.7 mA
V
DD
= 8, VEE = –8 — 1.4 4 — — 7.4
V
DD
V
to VEE, ISS = 0, 14433:
DD
= 5, VEE = – 5 — 0.9 2 — — 3.7
V
DD
VDD = 8, VEE = –8 — 1.8 4 — — 7.4
PSRR Supply Rejection
VDD to VEE, ISS = 0, V
REF
= 2V
VDD = 5, VEE = – 5
–1 — +1 — — — Counts
±0.00001
±0.3 — — ±1 µA
— 0.5 — — — — mV/V
3-128
TELCOM SEMICONDUCTOR, INC.
3-1/2 DIGIT A/D CONVERTERS
TC14433
TC14433A
NOTES: 1. Accuracy — The accuracy of the meter at full-scale is the accuracy of the setting of the reference voltage. Zero is recalculated during
each conversion cycle. The meaningful specification is linearity. In other words, the deviation from correct reading for all inputs other
than positive full-scale and zero is defined as the linearity specification.
2. The LSD stability for 200mV scale is defined as the range that the LSD will occupy 95% of the time.
3. Pin numbers refer to 24-pin DIP.
PIN CONFIGURATIONS
1
2
V
AG
V
REF
V
R
R1/C
C
CO
CO
DU
CLK1
CLK0
V
EE
1
2
3
X
4
1
5
1
6
1
TC14433AEPG
TC14433EPG
7
1
TC14433AEJG
8
2
TC14433EJG
9
10
11
12
(PDIP)
(CerDIP)
24
V
DD
23
Q
3
22
Q
2
Q
21
1
VDDQ
SS
3
EOC
R1/C
CLK1
CLK0
2
Q
OR
Q
20
0
DS
19
1
DS
18
2
17
DS
3
16
DS
4
15
OR
14
EOC
V
13
SS
X
REF
V
4 3 2 1 27 2628
R
5
1
R1/C
6
1
C
7
1
8
NC NC
CO
9
1
CO
10
2
11
DU
12 13 14 15 17 18
CLK1
AG
V
NC
V
TC14433AELI
TC14433ELI
(PLCC)
16
EE
NC
V
CLK0
V
V
V
REF
CO
CO
V
25
24
23
22
21
20
19
AG
V
R
C
DU
EE
X
1
1
1
1
2
Q
Q
DS
DS
DS
DS
1
2
3
4
5
6
7
8
9
10
11
12
1
0
1
2
3
4
TC14433COG
(SOIC)
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
Q
3
Q
2
Q
1
Q
0
DS
DS
DS
DS
OR
EOC
V
SS
3
1
2
3
4
4
5
6
TELCOM SEMICONDUCTOR, INC.
7
8
3-129
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