TL H 5550
LH0070
Series
Precision
BCD
Buffered
Reference
LH0071
Series
Precision
Binary
Buffered
Reference
July 1987
LH0070 Series Precision BCD Buffered Reference
LH0071 Series Precision Binary Buffered Reference
General Description
The LH0070 and LH0071 are precision three terminal volt-
age references consisting of a temperature compensated
zener diode driven by a current regulator and a buffer ampli-
fier The devices provide an accurate reference that is virtu-
ally independent of input voltage load current temperature
and time The LH0070 has a 10 000V nominal output to
provide equal step sizes in BCD applications The LH0071
has a 10 240V nominal output to provide equal step sizes in
binary applications
The output voltage is established by trimming ultra-stable
low temperature drift thin film resistors under actual operat-
ing circuit conditions The devices are shortcircuit proof in
both the current sourcing and sinking directions
The LH0070 and LH0071 series combine excellent long
term stability ease of application and low cost making
them ideal choices as reference voltages in precision D to A
and A to D systems
Features
Y
Accuracy output voltage
LH0070
10V
g
0 02%
LH0071
10 24V
g
0 02%
Y
Single supply operation
11 4V to 40V
Y
Low output impedance
0 2X
Y
Excellent line regulation
0 1 mV V
Y
Low zener noise
20 mVp-p
Y
3-lead TO-5 (pin compatible with the LM109)
Y
Short circuit proof
Y
Low standby current
3 mA
Equivalent Schematic
TL H 5550 1
Connection Diagram
TO-5 Metal Can Package
TL H 5550 7
Order Number LH0070-0H LH0071-0H LH0070-1H
LH0071-1H LH0070-2H or LH0071-2H
See NS Package Number H03B
Typical Applications
Statistical Voltage Standard
TL H 5550 8
Output Voltage Fine Adjustment
TL H 5550 9
Note
The output of the LH0070 and LH0071 may be adjusted to a precise voltage by using the above circuit since the supply current of the devices is
relatively small and constant with temperature and input voltage For the circuit shown supply sensitivities are degraded slightly to 0 01% V change in V
OUT
for changes in V
IN
and V
b
An additional temperature drift of 0 0001% C is added due to the variation of supply current with temperature of the LH0070 and LH0071 Sensitivity to the
value of R1 R2 and R3 is less than 0 001% %
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
(Note 4)
Supply Voltage
40V
Power Dissipation (See Curve)
600 mW
Short Circuit Duration
Continuous
Output Current
g
20 mA
Operating Temperature Range
b
55 C to
a
125 C
Storage Temperature Range
b
65 C to
g
150 C
Lead Temp (Soldering 10 seconds)
300 C
Electrical Characteristics
(Note 1)
Parameter
Conditions
Min
Typ
Max
Units
Output Voltage
T
A
e
25 C
LH0070
10 000
V
LH0071
10 24
V
Output Accuracy
T
A
e
25 C
b
0
b
1
g
0 03
g
0 1
%
b
2
g
0 02
g
0 05
%
Output Accuracy
T
A
e b
55 C 125 C
b
0
b
1
g
0 3
%
b
2
g
0 2
%
Output Voltage Change With
(Note 2)
Temperature
b
0
g
0 2
%
b
1
g
0 02
g
0 1
%
b
2
g
0 01
g
0 04
%
Line Regulation
13V
s
V
IN
s
33V T
C
e
25 C
b
0
b
1
0 02
0 1
%
b
2
0 01
0 03
%
Input Voltage Range
R
L
e
50 kX
11 4
40
V
Load Regulation
0 mA
s
I
OUT
s
5 mA
0 01
0 03
%
Quiescent Current
13V
s
V
IN
s
33V I
OUT
e
0 mA
1
3
5
mA
Change In Quiescent Current
D
V
IN
e
20V From 23V To 33V
0 75
1 5
mA
Output Noise Voltage
BW
e
0 1 Hz To 10 Hz T
A
e
25 C
20
m
Vp-p
Ripple Rejection
f
e
120 Hz
0 01
% Vp-p
Output Resistance
0 2
0 6
X
Long Term Stability
T
A
e
25 C (Note 3)
b
0
b
1
g
0 2
% yr
b
2
g
0 05
% yr
Thermal Resistance
T
j
e
150 C
i
ja
(Junction to Ambient)
200
C W
i
jc
(Junction to Case)
100
C W
Note 1
Unless otherwise specified these specifications apply for V
IN
e
15 0V R
L
e
10 kX and over the temperature range of
b
55 C
s
T
A
s a
125 C
Note 2
This specification is the difference in output voltage measured at T
A
e
85 C and T
A
e
25 C or T
A
e
25 C and T
A
e b
25 C with readings taken after test
chamber and device-under-test stabilization at temperature using a suitable precision voltmeter
Note 3
This parameter is guaranteed by design and not tested
Note 4
Refer to the following RETS drawings for military specifications
RETS0070-0H for LH0070-0H
RETS0071-0H for LH0071-0H
RETS0070-1H for LH0070-1H
RETS0071-1H for LH0071-1H
RETS0070-2H for LH0070-2H
RETS0071-2H for LH0071-2H
2
Typical Performance Characteristics
Maximum Power Dissipation
Quiescent Current vs Input
Voltage
Normalized Output Voltage
vs Temperature
Step Load Response
Output Short Circuit
Characteristics
TL H 5550 2
Noise Voltage
TL H 5550 6
Typical Applications
(Continued)
Expanded Scale AC Voltmeter
TL H 5550 4
3
Typical Applications
(Continued)
Dual Output Bench Power Supply
Precision Process Control Interface
Negative 10V Reference
Boosted Reference For
Low Input Voltages
TL H 5550 5
4
5
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