+

±

100 pF

1 M

2

3

1

250 k

110 k

20.4 k

10 k

X1

X5

X10

X50

X100

GAIN

1

SEC

5

SEC

10

SEC

50

SEC

100

SEC

1 M

5 M

10 M

50 M

100 M

+

±

9 V

8

7

6

5

- 9 V

OUTPUT TO

STRIP CHART

INPUT

(+)

INPUT

(±)

6

10 k

GAIN

1 F

½ LF442-MIL

½ LF442-MIL

Copyright © 2017, Texas Instruments Incorporated

13

LM442-MIL

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SNOSD59 – JUNE 2017

Product Folder Links: LM442-MIL

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Copyright © 2017, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LF442-MIL uses a combination of careful layout design and internal trimming to ensure very low input offset

voltage and voltage drift. The LF442-MIL also has a very low equivalent input noise voltage for a low power

amplifier. The LF442-MIL should be used where low power dissipation and good electrical characteristics are the

major considerations.

8.2 Typical Applications

1. Battery Powered Strip Chart Preamplifier

2. "No FET" Low Power V to F Converter

3. High Efficiency Crystal Oven Controller

4. Conventional Log Amplifier

5. Unconvential Log Amplifier

8.2.1 Battery Powered Strip Chart Preamplifier

Figure 28. Battery Powered Strip Chart Preamplifier

8.2.1.1 Design Requirements

Runs from 9V batteries (±9V supplies).

Fully set gain and time constant.

Battery powered supply allows direct plug-in interface to strip chart recorder without common-mode problems.