MC44BS373CAFCEVK Freescale Semiconductor, MC44BS373CAFCEVK Datasheet - Page 35

• Manufacturer Part Number: MC44BS373CAFCEVK
• Description: KIT EVAL FOR BS373CAFC 16PIN
• Manufacturer: Freescale Semiconductor

Specifications of MC44BS373CAFCEVK

• Main Purpose: Audio Video Integration Modulator
• Utilized Ic / Part: MC44BS373CA
• Interface Type: I2C
• Operating Temperature Range: + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MC44BS373CA

18.4 BiCMOS Modulator QFN20 Stereo Application
Notes:
14. Cx value depends on crystal characteristics; Cx = 27 pF on Motorola application board.
15. RF PLL loop filter components at pin 16 must be as close as possible to FCC at pin 17.
16. Supply voltage decoupling capacitors must be as close as possible to ground.
17. For a stereo application, the audio signal is already encoded in the baseband stereo encoder. It is not necessary to
18. It is possible to create a peak for the low frequencies (from 30 to 80 Hz) by adjusting the sound loop filter resistor.
19. Chip address select pin open (default I
LOP
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 by replacing the original pre-emphasis capacitor with a 100-nF
capacitor. Adding this value boosts the deviation and does not create a pre-emphasis.
A flat response is given with a value of 5.6 KΩ 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 (see audio section).
The value of the audio input series capacitor has been increased in order to have a lower cut-off frequency.
Pre-em
4MHz
Figure 18. Proposed QFN20 Package (Stereo Application Schematic)
Note 17
Audio
SDA
Note 14
O
470pF
Note 19
220nF
Cx
O
SCL
O
PREEM
GND
XTAL
CAS
LOP
2
MC44BS373CA Data Sheet
C address = 0xCA)
100nF
5
1
4
2
3
20
6
19
7
1uF
18
8
3K9 to 6K2
17
9
Note 18
10
16
15
14
13
12
11
10nF
22nF
TVOVCC
GND
TVOUT
NC
NC
Video
Note 16
75
47nF
O
10nF
10nF
1nF
2.2k
Note 16
Vcc
O
Note 15
Application Diagrams
O
1 uF
Vcc
TVOUT
O