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LF442 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LF442
Description  Dual Low Power JFET Input Operational Amplifier
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LF442 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Typical Applications (Continued)
High Efficiency Crystal Oven Controller
DS009155-13
•
T
control= 75˚C
•
A1’s output represents the amplified difference between the LM335 temperature sensor and the crystal oven’s temperature
•
A2, a free running duty cycle modulator, drives the LM395 to complete a servo loop
•
Switched mode operation yields high efficiency
•
1% metal film resistor
Conventional Log Amplifier
DS009155-14
RT = Tel Labs type Q81
Trim 5k for 10 µA through the 5k–120k combination
*1% film resistor
www.national.com
8


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