MC1403
Low Voltage Reference
A precision band−gap voltage reference designed for critical
instrumentation and D/A converter applications. This unit is designed
to work with D/A converters, up to 12 bits in accuracy, or as a
reference for power supply applications.
•
Output Voltage: 2.5 V
"25
mV
•
Input Voltage Range: 4.5 V to 40 V
•
Quiescent Current: 1.2 mA Typical
•
Output Current: 10 mA
•
Temperature Coefficient: 10 ppm/°C Typical
•
Guaranteed Temperature Drift Specification
•
Equivalent to AD580
•
Standard 8−Pin DIP, and 8−Pin SOIC Package
PRECISION LOW VOLTAGE
REFERENCE
PDIP−8
P1 SUFFIX
CASE 626
8
1
•
•
•
•
•
Typical Applications
Voltage Reference for 8 to 12 Bit D/A Converters
Low T
C
Zener Replacement
High Stability Current Reference
Voltmeter System Reference
Pb−Free Package is Available
8
1
SOIC−8
D SUFFIX
CASE 751
PIN CONNECTIONS
V
in
1
Unit
V
°C
°C
°C
°C
V
out
2
GND 3
NC 4
8 NC
7 NC
6 NC
5 NC
MAXIMUM RATINGS
(T
A
= 25°C, unless otherwise noted.)
Rating
Input Voltage
Storage Temperature
Junction Temperature
Operating Ambient Temperature Range
MC1403B
MC1403
Symbol
V
I
T
stg
T
J
T
A
−40 to +85
0 to + 70
Value
40
−65 to 150
+175
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
normal operating conditions) and are not valid simultaneously. If these limits are
exceeded, device functional operation is not implied, damage may occur and
reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
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1
2018 AUG
MC1403
+ 5.0 V
1
MC1403
3
2 2.5 V
1.0 k
R1
R2
Full Scale
Adjust 500
W
I
Ref
Reference
Amplifier
1.2 k
R3
* Caution: System stability may be affected if output capacitance
*
exceeds 1.0
mF.
Using higher capacitance values is not
*
recommended and should be carefully considered.
Monolithic D/A
Converter
*0.1
mF
C1
Figure 1. A Reference for Monolithic D/A Converters
Providing the Reference Current
for ON Semiconductor Monolithic D/A Converters
The MC1403 makes an ideal reference for many mono-
lithic D/A converters, requiring a stable current reference of
nominally 2.0 mA. This can be easily obtained from the
MC1403 with the addition of a series resistor, R1. A variable
resistor, R2, is recommended to provide means for full−
scale adjust on the D/A converter.
The resistor R3 improves temperature performance by
matching the impedance on both inputs of the D/A reference
amplifier. The capacitor decouples any noise present on the
reference line. It is essential if the D/A converter is located
any appreciable distance from the reference.
A single MC1403 reference can provide the required
current input for up to five of the monolithic D/A converters.
ELECTRICAL CHARACTERISTICS
(V
in
= 15 V, T
A
= 25°C, unless otherwise noted.)
Characteristic
Output Voltage
(I
O
= 0 mA)
Temperature Coefficient of Output Voltage*
MC1403
Output Voltage Change*
(Over specified temperature range)
MC1403B 0 to + 70°C
MC1403B −40 to + 85°C
Line Regulation (I
O
= 0 mA)
(15 V
p
V
I
p
40 V)
(4.5 V
p
V
I
p
15 V)
Load Regulation
(0 mA < I
O
< 10 mA)
Quiescent Current
(I
O
= 0 mA)
*Guaranteed but not tested.
Symbol
V
out
DV
O
/DT
DV
O
−
−
Reg
line
−
−
Reg
load
I
Q
−
−
1.2
0.6
−
1.2
4.5
3.0
10
1.5
mV
mA
−
−
7.0
12.5
mV
Min
2.475
−
Typ
2.5
10
Max
2.525
40
Unit
V
ppm/°C
mV
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2
2018 AUG
MC1403
V
in
2.0 k
2.0 k
2.0 k
2.0 k
1.0 k
32
V
out
1.5 k
C1
30 pF
2.37 k
1.73 k
10 k
1.483 k
1.0 k
5.61 k
This device contains 15 active transistors.
Figure 2. MC1403, B Schematic
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3
2018 AUG
MC1403
2.0
∆
Vout , CHANGE IN Vout (mV)
1.0
25°C
0
−1.0
−2.0
−3.0
−4.0
−5.0
−6.0
0
10
20
30
V
in
, INPUT VOLTAGE (V)
40
50
0°C
75°C
∆V
out , CHANGE IN OUTPUT VOLTAGE (mV)
10
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
1.0
2.0
3.0 4.0 5.0 6.0
7.0
I
out
, OUTPUT CURRENT (mA)
0°C
25°C
8.0
9.0
10
75°C
Figure 3. Typical Change in V
out
versus V
in
(Normalized to V
in
= 15 V @ T
C
= 25°C)
Figure 4. Change in Output Voltage
versus Load Current
(Normalized to V
out
@ V
in
= 15 V, I
out
= 0 mA)
1.25
I1, QUIESCENT CURRENT (mA)
∆
Vout , CHANGE IN Vout (mV)
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0
−40 −30 −20 −10
0 10 20 30 40 50
T
A
, TEMPERATURE (°C)
(V
in
= 15 V, I
out
= 0 mA)
60 70
80 85
I
out
= 2 mA
V
in
= 15 V
0
−2.0
−4.0
−6.0
−8.0
−10
−12
−14
−40 −30 −20 −10
0 10 20 30 40 50
T
A
, TEMPERATURE (°C)
60 70
80 85
V
in
= 5.0 V
Figure 5. Quiescent Current versus Temperature
Figure 6. Change in V
out
versus Temperature
(Normalized to V
out
@ V
in
= 15 V)
4.0
∆
Vout , CHANGE IN Vout (mV)
2.0
0
−2.0
−4.0
−6.0
−8.0
−10
−12
−40 −30 −20 −10
0
10
20
30
40
50
60 70
80 85
= 8.0 mA
= 5.0 mA
I
O
= 0 mA
= 2.0 mA
T
A
, TEMPERATURE (°C)
Figure 7. Change in V
out
versus Temperature
(Normalized to T
A
= 25°C, V
in
= 15 V, I
out
= 0 mA)
4
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2018 AUG
MC1403
3−1/2−Digit Voltmeter − Common Anode
Displays, Flashing Overrange
An example of a 3−1/2−digit voltmeter using the
MC14433 is shown in the circuit diagram of Figure 8. The
reference voltage for the system uses an MC1403 2.5 V
reference IC. The full scale potentiometer can calibrate for
a full scale of 199.9 mV or 1.999 V. When switching from
2.0 V to 200 mV operation, R
I
is also changed, as shown on
the diagram.
When using R
C
equal to 300 kW, the clock frequency for
the system is about 66 kHz. The resulting conversion time
is approximately 250 ms.
When the input is overrange, the display flashes on and
off. The flashing rate is one−half the conversion rate. This
is done by dividing the EOC pulse rate by 2 with 1/2
MC14013B flip−flop and blanking the display using the
blanking input of the MC14543B.
The display uses an LED display with common anode
digit lines driven with an MC14543B decoder and an
MC1413 LED driver. The MC1413 contains 7 Darlington
transistor drivers and resistors to drive the segments of the
display. The digit drive is provided by four MPS−A12
Darlington transistors operating in an emitter−follower
configuration. The MC14543B, MC14013B and LED
displays are referenced to V
EE
via Pin 13 of the MC14433.
This places the full power supply voltage across the display.
The current for the display may be adjusted by the value of
the segment resistors shown as 150
W
in Figure 8.
+5.0 V
0.1
mF
MC1403
1
3
0.1
mF
300 k
R
C
11 10
2
20 k
−5.0 V
+5.0 V
0.1
mF
2
12 24
23
22
21
20
MC14433
13
7
8
9
14
15 19 18 17 16
5.0 V
DS1
DS2
DS3
DS4
5
3
4
8
D S Q 13
11 C
Q 12
R
14
7 10
−5.0 V
+5.0 V
9
50
mF
−5.0 V
D
C
6
S
R
Q
Q
1
2
MC14013B
−5.0 V
51 k
+5.0 V
−5.0 V
−5.0 V
8
0.1
mF
4 1
2
3
5
16 9
10
11
12
13
14
15
7
MC14543B
7
6
5
4
3
2
1
−5.0 V
−5.0 V
10
11
12
13
14
15
16
+5.0 V
+5.0 V
Segment Resistors
150
W
(7)
MC1413
V
X
R
I
*
3
1
4
5
6
0.1
mF
**
6
Minus Sign
200
W
MPS−A12 Plus Sign
110
W
Common
Anode
LED
Display
f g e d c b a
0.1
mF
0.1
mF
MPS−A12
(4)
* R
I
= 470 kW for 2.0 V Range
R
I
= 27 kW for 200 mV Range
** Mylar Capacitor
Figure 8. 3−1/2−Digit Voltmeter
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2018 AUG
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