TC14433/A
3-1/2 Digit, Analog-to-Digital Converter
Features:
•
•
•
•
•
•
•
•
•
•
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: ±4.5V to ±8V
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.
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 4 mW, approximately one-
half that of the industry standard TC14433.
The TC14433/A is available in 24-Pin PDIP, 24-Pin
SOIC (TC14433 device only), and 28-Pin PLCC
packages.
Applications:
•
•
•
•
•
•
Portable Instruments
Digital Voltmeters
Digital Panel Meters
Digital Scales
Digital Thermometers
Remote A/D Sensing Systems
Package Type
24-Pin PDIP (Wide)
24-Pin SOIC (Wide)
V
AG
V
REF
V
X
R
1
R
1
/C
1
C
1
CO
1
CO
2
DU
1
2
3
4
5
6
7
8
9
24 V
DD
23 Q
3
22 Q
2
21 Q
1
R
1
5
R
1
/C
1
6
C
1
7
NC 8
CO
1
9
CO
2
10
DU 11
12 13 14 15 16 17 18
CLK1
CLK0
EOC
V
EE
V
SS
OR
DS21394D-page 1
NC
V
X
28-Pin PLCC
V
REF
V
DD
V
AG
NC
Q
3
Q
2
25 Q
1
24 Q
0
23 DS
1
22 NC
21 DS
2
20 DS
3
19 DS
4
4
3
2
1
28 27 26
TC14433/A
20 Q
0
19 DS
1
18 DS
2
17 DS
3
16 DS
4
15 OR
14 EOC
13 V
SS
TC14433/A
CLK1 10
CLK0 11
V
EE
12
Note 1:
2:
NC = No internal connection (In 28-Pin PLCC).
24-Pin SOIC (Wide) package, only for TC14433
device.
©
2008 Microchip Technology Inc.
TC14433/A
Typical Application
MCP1525
+5V
V
IN
V
OUT
V
SS
1 µF
300
kΩ
R
C
11 10 2 12 24
23
22
21
4
20
5
TC14433
6
13
3
1
R
1
*
7
8
9
14
15 19 18 17 16
+5V
0.1 µF
0.1 µF
1
4
2
3
5
-5V
16
7
6
5
4
3
2
1
-5V
-5V
10
11
12
13
14
15
16
1413
Minus Sign
f g e d c b a
20 kΩ
-5V
+5V
+5V
Segment
Resistors
150Ω (7)
1 µF
V
X
0.1 µF**
0.1 µF**
9
10
11
12
13
4543B
14
15
8 6 7
-5V
-5V
6
5 S 1
Q
3 D
2
C RQ
4
8
9 D S Q 13
11 C Q 12
R
710 14
+5V
14013B
200Ω
MPS-A12 Plus Sign
-5V
110Ω
51 kΩ
Common
Anode Led
+5V
Display
50 µF
0.1 µF
MPS-A12
(4)
-5V
*R
1
= 470 kΩ for 2V Range
*R
1
= 27 kΩ for 200 mV Range
**Mylar Capacitor
DS4
DS3
DS2
DS1
-5V
DS21394D-page 2
©
2008 Microchip Technology Inc.
TC14433/A
1.0
ELECTRICAL
CHARACTERISTICS
†
Notice:
Stresses above those listed under “Absolute
Maximum Ratings” may cause permanent damage to
the device. These are stress ratings 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.
Absolute Maximum Ratings†
Supply Voltage (V
DD
– V
EE
) ................... -0.5V to +18V
Voltage on Any Pin:
Reference to V
EE
.....................-0.5V to (V
DD
+ 0.5)
DC Current, Any Pin: ....................................... ±10 mA
Power Dissipation (T
A
≤
70°C):
Plastic PLCC ................................................. 1.0W
Plastic PDIP.............................................. 940 mW
SOIC ......................................................... 940 mW
Operating Temperature Range ............ -40°C to +85°C
Storage Temperature Range .............. -65°C to +160°C
TC14433/A ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
Unless otherwise specified, V
DD
= +5V, V
EE
= -5V, C
1
= 0.1 µF, (Mylar), C
0
= 0.1 µF,
R
C
= 300 kΩ, R
1
= 470 kΩ @ V
REF
= 2V, R
1
= 27 kΩ @ V
REF
= 200 mV, T
A
= +25°C.
Parameter
Analog Input
Rollover Error (Positive) and
Negative Full Scale
Symmetry
Linearity Output Reading
(Note 1)
Stability Output Reading
(Note 2)
SYE
-1
—
+1
—
—
—
Counts
200 mV Full Scale
V
IN
-V
IN
= +V
IN
V
REF
= 2V
V
REF
= 200 mV
V
X
= 1.99V,
V
REF
= 2V
V
X
= 199 mV,
V
REF
= 200 mV
V
X
= 0V, V
REF
= 2V
Symbol
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
NL
SOR
-0.05
-1 count
—
—
+0.05
—
—
—
0
±20
±20
±20
65
+0.05
+1 count
2
3
0
±100
±100
±100
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
%rdg
%rdg
LSD
LSD
LSD
pA
pA
pA
dB
Zero Output Reading
Bias Current: Analog Input
Reference Input
Analog Ground
Common mode Rejection
Note 1:
ZOR
I
IN
—
—
—
—
CMRR
—
V
X
= 1.4V, V
REF
= 2V,
F
OC
= 32 kHz
2:
3:
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.
The LSD stability for 200 mV scale is defined as the range that the LSD will occupy 95% of the time.
Pin numbers refer to 24-pin PDIP.
©
2008 Microchip Technology Inc.
DS21394D-page 3
TC14433/A
TC14433/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics:
Unless otherwise specified, V
DD
= +5V, V
EE
= -5V, C
1
= 0.1 µF, (Mylar), C
0
= 0.1 µF,
R
C
= 300 kΩ, R
1
= 470 kΩ @ V
REF
= 2V, R
1
= 27 kΩ @ V
REF
= 200 mV, T
A
= +25°C.
Parameter
Digital
Output Voltage
(Pins 14 to 23)
(Note 3)
Output Voltage
(Pins 14 to 23)
(Note 3)
Output Current
(Pins 14 to 23)
V
OL
—
—
V
OH
I
OH
4.95
4.95
-0.2
- 0.5
Output Current
(Pins 14 to 23)
I
OL
0.51
1.3
Clock Frequency
Input Current -DU
Power
Quiescent Current:
TC14433A:
I
Q
—
—
—
Quiescent Current:
TC14433
—
—
—
Supply Rejection
PSRR
—
—
0.4
1.4
—
0.9
1.8
0.5
—
2
4
—
2
4
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3.7
7.4
—
3.7
7.4
—
—
mA
mA
—
mA
mA
mV/V
V
DD
to V
EE
, I
SS
= 0
V
DD
= 5, V
EE
= -5
V
DD
= 8, V
EE
= -8
V
DD
to V
EE
, I
SS
= 0
V
DD
= 5, V
EE
= -5
V
DD
= 8, V
EE
= -8
V
DD
to V
EE
, I
SS
= 0,
V
REF
= 2V,
V
DD
= 5, V
EE
= -5
f
CLK
I
DU
—
—
0
-5
5
5
-0.36
-0.9
0.88
2.25
66
±0.00
001
0.05
-4.95
—
—
—
—
—
—
—
±0.3
—
—
4.95
4.95
-0.14
-0.35
0.36
0.9
—
—
—
—
—
—
—
—
—
—
—
—
0.05
-4.95
—
—
—
—
—
—
—
±1
V
V
V
V
mA
mA
mA
mA
kHz
µA
V
SS
= 0V, “0” Level
V
SS
= -5V, “0” Level
V
SS
= 0V, “1” Level
V
SS
= -5V, “1” Level
V
SS
= 0V, V
OH
= 4.6V
Source
V
SS
= -5V, V
OH
= 5V
Source
V
SS
= 0V, V
OL
= 0.4V
Sink
V
SS
= -5V,
V
OL
= -4.5V Sink
R
C
= 300 kΩ
Symbol
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Note 1:
2:
3:
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.
The LSD stability for 200 mV scale is defined as the range that the LSD will occupy 95% of the time.
Pin numbers refer to 24-pin PDIP.
TEMPERATURE SPECIFICATIONS
Electrical Characteristics:
Unless otherwise indicated, V
DD
= +5V and V
EE
= -5V.
Parameters
Temperature Ranges
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 24LD PDIP
Thermal Resistance, 24LD CERDIP
Thermal Resistance,24LD SOIC Wide
Thermal Resistance, 28LD PLCC
Note:
θ
JA
θ
JA
θ
JA
θ
JA
—
—
—
—
60.5
N/A
70
61.2
—
—
—
—
°C/W
°C/W
°C/W
°C/W
T
A
T
A
-40
-65
—
—
+85
+150
°C
°C
Note
Sym
Min
Typ
Max
Units
Conditions
The internal junction temperature (T
J
) must not exceed the absolute maximum specification of +150°C.
DS21394D-page 4
©
2008 Microchip Technology Inc.
TC14433/A
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note:
Unless otherwise specified, V
DD
= +5V, V
EE
= -5V, C
1
= 0.1 µF, (Mylar), C
0
= 0.1 µF, R
C
= 300 kΩ, R
1
= 470 kΩ @ V
REF
= 2V,
R
1
= 27 kΩ @ V
REF
= 200 mV, T
A
= +25°C.
Typical Rollover Error vs. Power Supply Skew
ROLLOVER ERROR (IN LSD)
AT FULL SCALE
(PLUSE COUNT LESS MINUS COUNT)
4
3
2
1
0
-1
-2
-3
-4
-3
-2
-1
0
1
2
3
4
Note: Rollover Error is the Difference in Output
Reading for the same Analog Input Switched
from Positive to Negative.
Typical Quiescent Power Supply Current vs.Temp.
4
I
Q
- QUIESCENT CURRENT (mA)
3
V
EE
= -8V
V
DD
= +8V
2
1
V
EE
= -5V
V
DD
= +5V
0
-40
-20
0
20
40
60
80
100
(V
DD
I-IV
EE
I) - SUPPLY VOLTAGE SKEW (V)
T
A
- TEMPERATURE (°C)
FIGURE 2-1:
Supply Skew
Rollover Error vs. Power
FIGURE 2-4:
Quiescent Power Supply
Current vs. Ambient Temperature.
Typical P-Channel Sink Current at V
DD
– V
SS
= 5 Volts
-3
I
D
- SINK CURRENT (mA)
Typical N-Channel Sink Current at V
DD
– V
SS
= 5 Volts
5
I
D
- SINK CURRENT (mA)
4
3
2
1
0
0
1
2
3
4
5
V
DS
- DRAIN TO SOURCE VOLTAGE (V
DC
)
-40°C
+25°C
+85°C
-40°C
-2
+25°C
+85°C
-1
0
0
-1
-2
-3
-4
-5
V
DS
- DRAIN TO SOURCE VOLTAGE (V
DC
)
FIGURE 2-2:
Sink Current at V
DD
= 5V.
FIGURE 2-5:
Sink Current at VDD = 5V.
Typical Clock Frequency vs. Resistor (R
C
)
I
CLK
- CLOCK FREQUENCY (Hz)
Typical % Change fo Clock Frequency vs. Temp.
4
1M
Note: ±5% Typical Variation over
Supply Voltage Range
of ±4.5V to ±8V
I
CLK
- CLOCK FREQUENCY
(% CHANGE)
3
2
1
0
-1
-2
±5V Supply
±8V Supply
100k
Normalized at 25°C
-3
-4
-40
-20
0
20
40
60
80
10k
10kΩ
100kΩ
1MΩ
R
C
- CLOCK FREQUENCY RESISTOR
CLOCK FREQUENCY
±1.5%
16,400
CLOCK FREQUENCY
80
T
A
- TEMPERATURE (°C)
CONVERSION RATE =
MULTIPLEX RATE =
CLOCK FREQUENCY
16,400
CLOCK FREQUENCY
80
±1.5%
CONVERSION RATE =
MULTIPLEX RATE =
FIGURE 2-3:
Resistor (R
C
)
Clock Frequency vs.
FIGURE 2-6:
% Change to Clock
Frequency vs. Ambient Temperature.
DS21394D-page 5
©
2008 Microchip Technology Inc.
京公网安备 11010802033920号
EEWORLD
