Datasheet

 2016 Microchip Technology Inc. DS20005651A-page 9
MM5450/51
4.0 TYPICAL APPLICATIONS
FIGURE 4-1: Typical Application of
Constant Current Brightness Control.
FIGURE 4-2: Brightness Control Varying
the Duty Cycle.
FIGURE 4-3: Basic Electronically Tuned Radio System.
LM324
MM5450
LM317
–
+
¨9
240
ȍ
RAW DC
!9
¨9
1K
I
19
=
2N2907
I
19
PIN 19
9
20
1
5k
9
1k
CD4046
(VCO)
5V
MM74HC123
10 μS
MM5450
Q19
20
1
LED DISPLAY
34
MM5450
DISPLAY DRIVER
ELECTRONIC
TUNING
CONTROLLER
PLL
SYNTHESIZER
KEYBOARD
STATION DETECT, ETC.
AM
FM