LM9140| Datasheet

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LM9140 Precision Micropower Shunt Voltage Reference

April 1998

LM9140 Precision Micropower Shunt Voltage Reference
General Description
The LM9140's reverse breakdown voltage temperature coefficients of 25 ppm/ C are ideal for precision applications. The LM9140's advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM9140 easy to use. Further reducing design effort is the availability of several fixed reverse breakdown voltages: 2.500V, 4.096V, 5.000V, and 10.000V. The minimum operating current increases from 60 uA for the LM9140-2.5 to 100 uA for the LM9140-10.0. All versions have a maximum operating current of 15 mA. The LM9140 utilizes fuse and zener-zap reverse breakdown voltage trim during wafer sort to ensure that the prime parts have an accuracy of better than 0.5% (B grade) at 25 C. Bandgap reference temperature drift curvature correction and low dynamic impedance ensure stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. n Tolerates capacitive loads n Fixed reverse breakdown voltages of 2.500V,
4.096V, 5.000V, and 10.000V

Key Specifications
(LM9140-2.5) n Temperature coefficient: 25 ppm/ C (max) n Output voltage tolerance: 0.5% (max) n Low output noise (10 Hz to 10 kHz): 35 uVrms (typ) n Wide operating current range: 60 uA to 15 mA n Industrial temperature range: -40 C to +85 C

Applications
n n n n n n n n Portable, Battery-Powered Equipment Data Acquisition Systems Instrumentation Process Control Energy Management Product Testing Automotive Precision Audio Components

Features
n n n n Guaranteed temperature coefficient of 25 ppm/ C Reverse breakdown voltage tolerance of 0.5% Small package: TO-92 No output capacitor required

Connection Diagram
TO-92

DS011393-2

Bottom View See NS Package Number Z03A

Ordering Information
Reverse Breakdown Voltage Tolerance at 25 C and Average Reverse Breakdown Voltage Temperature Coefficient 0.5%, 25 ppm/ C max LM9140BYZ-2.5, LM9140BYZ-4.1, LM9140BYZ-5.0, LM9140BYZ-10.0 Z (TO-92)

1998 National Semiconductor Corporation

DS011393

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