lf444cmx National Semiconductor Corporation, lf444cmx Datasheet - Page 9

• Manufacturer Part Number: lf444cmx
• Description: Quad Low Power Jfet Input Operational Amplifier
• Manufacturer: National Semiconductor Corporation

Typical Application
***For R2 = 50k, R4 = 330k
For R2 = 100k, R4 = 75k
For R2 = 200k, R4 = 56k
**Polystyrene
*Film resistor type RN60C
To calibrate, insert probe in pH =7 solution. Set the “TEMPERATURE ADJUST” pot, R2, to correspond to the solution temperature: full clockwise for 0˚C, and
proportionately for intermediate temperatures, using a turns-counting dial. Then set “CALIBRATE” pot so output reads 7V.
Typical probe = Ingold Electrodes #465-35
±
±
1%
1%
±
1%
pH Probe Amplifier/Temperature Compensator
9
00915610
www.national.com