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參數(shù)資料
| 型號： | DRP3510 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Digital Receiver Front-end |
| 中文描述： | 數(shù)字接收機(jī)前端 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大小： | 450K |
| 代理商： | DRP3510 |
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ADVANCE INFORMATION
DRX 3960A
Micronas
7
1.3.1. Initialization for Analog TV
The DRX 3960A is able to operate with different refer-
ence frequencies. If 20.25 MHz is used, REF_SW has
to be connected to ground; additionally, if a lower fre-
quency is used, SYN_REF (control register) has to be
set accordingly. If a higher frequency is used,
REF_SW has to be connected to V
DVDD
and
SYN_REF has to be set accordingly. In the 20.25 MHz
case, no I
2
C command is needed.
The standard which should be processed has to be set
via I
2
C bus.
Additional controlling is only needed if the default val-
ues for the remaining write registers are not applicable.
1.3.2. Multistandard Configuration for
B/G, L, I, D/K and M/N
In multistandard applications for B/G, L, I, D/K, and M/N,
the picture carrier frequency at the tuner output should
be 38.9 MHz. The sound carrier frequencies are below
in a distance corresponding to the transmission stan-
dard. Thus, all wanted channel components are within
the passband of the SAW and forwarded to the
DRX 3960A. The demodulated and filtered video sig-
nal will be available at the CVBS output and the down-
converted sound carriers will be available at the 2
nd
SIF output.
1.3.3. Multistandard Configuration for L
’
In the L standard, the band 1 channels (40 MHz to
65 MHz) have a different frequency configuration.
Their sound carriers are below the according picture
carrier. This sub-standard is called L
’
. In that case, the
picture carrier frequency at the tuner output should be
32.9 MHz. Using conventional tuners, the sound car-
rier frequencies in L
’
at the tuner output are above the
picture carrier. Thus, again all wanted channel compo-
nents are within the passband of the SAW.
1.3.4. FM Radio
In FM radio applications, the tuner has to down-con-
vert the wanted channel to 32.4 MHz. Therefore, the
lower slope of the SAW frequency response rejects
adjacent carriers on one side of that channel. The
DRX 3960A further down-converts the wanted channel
to 5.5 MHz. After additional filtering, the signal is fed to
the 2
nd
SIF output.
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