TLH5550

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 10000V nominal output to

provide equal step sizes in BCD applications The LH0071

has a 10240V 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

LH0071

Y

Single supply operation

114V to 40V

Y

Low output impedance

02X

Y

Excellent line regulation

01 mVV

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

TLH5550 – 1

Connection Diagram

TO-5 Metal Can Package

TLH5550 – 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

TLH5550 – 8

Output Voltage Fine Adjustment

TLH5550 – 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

An additional temperature drift of 00001% 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 0001%%

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A