MC44BS373CADR2 datasheet(33/52 Pages) FREESCALE

33 / 52 page

MC44BS373CA Data Sheet

Application Diagrams

18.2 BiCMOS Modulator SO16NB Stereo Application

Figure 16. Proposed SO16 Package (Stereo Application Schematic)

Notes:

4. Cx value depends on crystal characteristics; Cx = 27 pF on Motorola application board.

5. RF PLL loop filter components at pin 14 must be as close as possible to FCC at pin 15.

6. Supply voltage decoupling capacitors must be as close as possible to ground.

7. For a stereo application, the audio signal is already encoded in the baseband stereo encoder. It is not necessary to

create a pre-emphasis and in this case the pre-emphasis capacitor has to be removed. Sometimes for the same

application it is useful to increase the FM deviation. To increase FM deviation, replace the original pre-emphasis

capacitor with a 100-nF capacitor. Adding this kind of value boosts the deviation and does not create a pre-emphasis.

8. It is possible to create a peak for the low frequencies (from 30 to 80 Hz) by adjusting the resistor of the sound loop

filter. A flat response is given with a value of 5.6 K

Ω but this value can be set to 4.7 KΩ. This gives a peak of about

1 dB at 40 Hz and extends the low-frequency cut-off at 28 Hz. The value of the audio input series capacitor has been

increased in order to have a lower cut-off frequency.

9. The value of the audio input series capacitor has been increased in order to have a lower cutoff frequency.

TVOUT

2.2k

22nF

1nF

10nF

47nF

Vcc

SCL

SDA

4MHz

Vcc

Pre-em

GNDD

VCCD

PLLFLT

GND

VIDEO

TVOVCC

SPLLFLT

SDA

SCL

LOP

TVOUT

VCCA

Audio

Video

LOP

10nF

100nF

1 uF

220nF

100nF

Note 7

XTAL

GND

PREEM

AUDIO

10nF

Note 4

3K9 to 6K2

Note 5

Note 8

Note 9

Note 6

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