參數(shù)資料
型號(hào)： MC44BS373CAEF
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 29/52頁(yè)
文件大?。?/td> 0K
描述： AUDIO VIDEO INTERGRATION MOD
標(biāo)準(zhǔn)包裝： 48
類(lèi)型： NTSC/PAL 調(diào)制器
應(yīng)用： 音頻/視頻，VCR，機(jī)頂盒
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 管件
MC44BS373CA Data Sheet
Application Diagrams
18.4 BiCMOS Modulator QFN20 Stereo Application
Figure 18. Proposed QFN20 Package (Stereo Application Schematic)
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
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.
18. It is possible to create a peak for the low frequencies (from 30 to 80 Hz) by adjusting the sound loop filter resistor.
A flat response is given with a value of 5.6 K
but this value can be set to 4.7 K. This gives a peak of about 1 dB
at 40 Hz and extends the low-frequency cut-off at 28 Hz (see audio section).
19. Chip address select pin open (default I2C address = 0xCA)
The value of the audio input series capacitor has been increased in order to have a lower cut-off frequency.
TVOUT
O
2.2k
22nF
1nF
10nF
47nF
Vcc
O
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SCL
SDA
4MHz
Vcc
Pre-em
O
G
NDD
V
CCD
PL
L
F
L
T
GND
VID
E
O
TVOVCC
S
P
LL
FL
T
SD
A
SC
L
LOP
TVOUT
V
CCA
Audio
O
Video
LOP
O
10 nF
1 uF
1uF
220nF
Cx
100nF
470pF
75
XTAL
GND
PREEM
AUDIO
10nF
O
Note 14
3K9 to 6K2
Note 15
Note 16
17
18
19
20
CAS
AUX
IN
NC
Note 19
Note 18
Note 17
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