CS8191

http://onsemi.com

7

Ripple voltage on the F/V output causes pointer or needle

flutter especially at low input frequencies.

The response time of the F/V is determined by the time

will reduce the ripple on the F/V output but will also increase

the response time. An increase in response time causes a

very slow meter movement and may be unacceptable for

many applications.

Figure 7. Partial Schematic of Input and Charge Pump

R3

2.7 V

R4

CP+

Q1

Q2

Q3

0.25 V

2.0 V

CP–

C4

F to V

+

–

+

–

+

–

0

T

0

0