Datasheet

LF442
SNOSC03E –APRIL 1999–REVISED OCTOBER 2013 www.ti.com
High Efficiency Crystal Oven Controller
• 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
R
T
= Tel Labs type Q81
Trim 5k for 10 μA through the 5k–120k combination
*1% film resistor
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