LM4140ACMX-4.1 National Semiconductor, LM4140ACMX-4.1 Datasheet

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LM4140ACMX-4.1

Manufacturer Part Number
LM4140ACMX-4.1
Description
High Precision Low Noise Low Dropout Voltage
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
LM4140
High Precision Low Noise Low Dropout Voltage
Reference
General Description
The LM4140 series of precision references are designed to
combine high accuracy, low drift and noise with low power
dissipation in a small package.
The LM4140 is the industry’s first reference with output volt-
age options lower than the bandgap voltage.
The key to the advance performance of the LM4140 is the
use of EEPROM registers and CMOS DACs for temperature
coefficient curvature correction and trimming of the output
voltage accuracy of the device during the final production
testing.
The major advantage of this method is the much higher reso-
lution available with DACs than is available economically
with most methods utilized by other bandgap references.
The low input and dropout voltage, low supply current and
output drive capability of the LM4140 makes this product an
ideal choice for battery powered and portable applications.
The LM4140 is available in three grades (A, B, C) with 0.1%
initial accuracy and 3, 6 and 10 ppm/˚C temperature coeffi-
cients. For even lower Tempco, contact National Semicon-
ductor.
The device performance is specified over the temperature
range (0˚C to +70˚C) and is available in compact 8-pin SO
package.
For other output voltage options from 0.5V to 4.5V, con-
tact National Semiconductor.
Typical Application
C
OUT
, Output bypass capacitor. See text for selection detail.
DS101079
DS101079-1
Refer to the Ordering Information Table in this Data Sheet for Specific Part
Number
Features
n High initial accuracy: 0.1%
n Ultra low noise
n Low Temperature Coefficient: 3 ppm/˚C (A grade)
n Low voltage operation: 1.8V
n SO-8 package
n Low dropout voltage: 20 mV (typ)
n Supply Current: 230 µA (typ),
n Enable pin
n Output voltage options: 1.024V, 1.250V, 2.048V, 2.500V,
n Custom voltages from 0.5V to 4.5V
n Temperature range (0˚C to 70˚C)
Applications Summary
n Portable, battery powered equipment
n Instrumentation and test equipment
n Automotive
n Industrial process control
n Data acquisition systems
n Medical equipment
n Precision scales
n Servo systems
n Battery charging
and 4.096V
Typical Temperature Coefficient
(Sample of 5 Parts)
1 µA disable mode
@
1mA
DS101079-23
www.national.com
July 2000

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LM4140ACMX-4.1 Summary of contents

Page 1

... For other output voltage options from 0.5V to 4.5V, con- tact National Semiconductor. Typical Application C , Output bypass capacitor. See text for selection detail. OUT © 2000 National Semiconductor Corporation Features n High initial accuracy: 0.1% n Ultra low noise n Low Temperature Coefficient: 3 ppm/˚C (A grade) n Low voltage operation: 1.8V ...

Page 2

... Pulled to input for normal operation. Forcing this pin to ground will turn-off the output. This pin must be left open. 2 LM4140 Supplied as 2500 Units, Tape and Reel LM4140ACMX-1.0 LM4140ACMX-1.2 LM4140ACMX-2.0 LM4140ACMX-2.5 LM4140ACMX-4.1 LM4140BCMX-1.0 LM4140BCMX-1.2 LM4140BCMX-2.0 LM4140BCMX-2.5 LM4140BCMX-4.1 LM4140CCMX-1.0 LM4140CCMX-1.2 LM4140CCMX-2.0 LM4140CCMX-2.5 LM4140CCMX-4.1 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Voltage on any Input pin Output Short-Circuit Duration Power Dissipation (T = 25˚C) A (Note 2) ESD Susceptibility (Note 3) Human Body Model Machine Model ...

Page 4

LM4140 Electrical Charateristics Unless otherwise specified 3.0V for the LM4140-1.024 and LM4140-1.250 1µF (Note 4 OUT LOAD boldface type apply over 0˚C to 70˚C temperature range. Symbol Parameter Operating ...

Page 5

LM4140 Typical Performance Characteristics C = 1µ 3.0V for LM4140-1.024 and LM4140-1.250, and 5V for all other voltage options. V OUT IN Power Up/Down Ground Current * The 1µF output capacitor is actively discharged to ground. See ON/OFF ...

Page 6

LM4140 Typical Performance Characteristics C = 1µ 3.0V for LM4140-1.024 and LM4140-1.250, and 5V for all other voltage options. V OUT IN Output Impedance Dropout Voltage vs Load Current Note: 1.024V and 1.250V options require 1.8V supply. www.national.com ...

Page 7

LM4140 Typical Performance Characteristics C = 1µ 3.0V for LM4140-1.024 and LM4140-1.250, and 5V for all other voltage options. V OUT IN Total Current ( Supply Voltage S(OFF) Spectral Noise Density (0.1Hz to 10Hz) Ground Current ...

Page 8

LM4140 Typical Performance Characteristics C = 1µ 3.0V for LM4140-1.024 and LM4140-1.250, and 5V for all other voltage options. V OUT IN Load Regulation vs Temperature Line Regulation vs Temperature Short Circuit Current vs Temperature www.national.com Unless otherwise ...

Page 9

Application Hints Input Capacitors Although not always required, an input capacitor is recom- mended. A supply bypass capacitor on the input assures that the reference is working from a source with low impedance, which improves stability. A bypass capacitor can ...

Page 10

Application Hints (Continued) However, they sometimes have an ESR values lower than the minimum required by the LM4140, and relatively large capacitance change with temperature. The manufacturer’s datasheet for the capacitor should be consulted before se- lecting a value. Test ...

Page 11

Application Hints (Continued) FIGURE 5. Suggested PCB Layout with Slot 11 DS101079-34 DS101079-35 www.national.com ...

Page 12

Typical Application Circuits Boosted Output Current Complimentary Outputs * Low Noise Op Amp such as OP-27 Precision Programmable Current Source www.national.com Boosted Ouput Current with Current Limiter DS101079-15 Voltage Reference with Force and Sense Output DS101079-19 Precision DAC Reference DS101079-21 ...

Page 13

Typical Application Circuits Strain Gauge Conditioner for 350 (Continued) Bridge FIGURE 6. 13 DS101079-37 DS101079-26 www.national.com ...

Page 14

Typical Application Circuits www.national.com (Continued) FIGURE 7. 14 DS101079-27 ...

Page 15

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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