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PDF LM4140 Data sheet ( Hoja de datos )
| Número de pieza | LM4140 | |
| Descripción | High Precision Low Noise Low Dropout Voltage | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4140 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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July 2000
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.
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) @ 1mA
n Supply Current: 230 µA (typ), ≤ 1 µA disable mode
n Enable pin
n Output voltage options: 1.024V, 1.250V, 2.048V, 2.500V,
and 4.096V
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
Typical Application
Typical Temperature Coefficient
(Sample of 5 Parts)
DS101079-1
COUT, Output bypass capacitor. See text for selection detail.
DS101079-23
Refer to the Ordering Information Table in this Data Sheet for Specific Part
Number
© 2000 National Semiconductor Corporation DS101079
www.national.com
1 page  
LM4140 Typical Performance Characteristics Unless otherwise specified, TA = 25˚C, No Load,
COUT = 1µF, VIN = 3.0V for LM4140-1.024 and LM4140-1.250, and 5V for all other voltage options. VIN = VEN.
Power Up/Down Ground Current
Enable Response
DS101079-5
DS101079-6
* The 1µF output capacitor is actively discharged to ground. See ON/OFF Operation section for more details.
Line Transient Response
Load Transient Response
DS101079-7
DS101079-8
5 www.national.com
5 Page 
Application Hints (Continued)
DS101079-34
DS101079-35
FIGURE 5. Suggested PCB Layout with Slot
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM4140.PDF ] | |
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