lf442-mwa National Semiconductor Corporation, lf442-mwa Datasheet - Page 10

• Manufacturer Part Number: lf442-mwa
• Description: Dual Low Power Jfet Input Operational Amplifier
• Manufacturer: National Semiconductor Corporation

www.national.com
Typical Applications
Trim 1M pot for 1 kHz full-scale output
15 mW power drain
No integrator reset FET required
Mount D1 and D2 in close proximity
1% linearity to 1 kHz
• T
• 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
control
= 75˚C
(Continued)
High Efficiency Crystal Oven Controller
“No FET” Low Power V → F Converter
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