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
Y
Y
Y
Y
Y
Y
Y
Accuracy output voltage
LH0070
10V
g
0 02%
LH0071
10 24V
g
0 02%
Single supply operation
11 4V to 40V
Low output impedance
0 2X
Excellent line regulation
0 1 mV V
Low zener noise
20
mVp-p
3-lead TO-5 (pin compatible with the LM109)
Short circuit proof
Low standby current
3 mA
Equivalent Schematic
Connection Diagram
TO-5 Metal Can Package
TL H 5550 鈥?7
TL H 5550 鈥?1
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
Output Voltage Fine Adjustment
TL H 5550 鈥?9
TL H 5550 鈥?8
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% %
C
1995 National Semiconductor Corporation
TL H 5550
RRD-B30M115 Printed in U S A
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