參數(shù)資料
型號(hào)： TDA936X
廠商： NXP Semiconductors N.V.
英文描述： TV signal processor-Teletext decoder with embedded m-Controller
中文描述： 電視信號(hào)處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù)： 88/140頁
文件大?。?/td> 570K
代理商： TDA936X
1999 Sep 28
88
Philips Semiconductors
Preliminary Device Specification
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA935X/6X/8X series
TO LUMA/SYNC/DATA SLICING
TO CHROMA
CHROMA
CVBS/Y
CVBS
INT
VIM
VIDEO IDENT
IDENT
Fig.40 CVBS switch and interfacing of video ident
(+)
IFVO
IFVO/SVO
40
42
43
38
SVO
Video switches
The video switch has one input for an external CVBS or
Y/C signal. The switch configuration is given in Fig.40. The
selected CVBS signal can be supplied to pin 38, the IF
video output. The selection between both signals is
realised by means of the SVO bit in subaddress 22H.
The video ident circuit can be connected to the incoming
‘internal’ video signal or to the selected signal. This ident
circuit is independent of the synchronisation and can be
used to switch the time-constant of the horizontal PLL
depending on the presence of a video signal (via the VID
bit). In this way a very stable OSD can be realised.
Because of the availability of the Y/C input and the
subcarrier output an external comb-filter can be applied. In
that case an external video switch (or comb-filter with
integrated switch) must be used.
The subcarrier output is combined with a 3-level output
switch (0 V, 4 V and 8 V). The output level and the
availability of the subcarrier signal is controlled by the
CMB1 and CMB0 bits. The output can be used to switch
sound traps etc. It is also possible to use this pin for the
connectionof theAVLcapacitor,externalsound IFinputor
as AM output. The possibilities are illustrated in table 1.
Synchronisation circuit
The IC contains separator circuits for the horizontal and
vertical sync pulses and a data-slicing circuit which
extracts the digital teletext data from the analog signal.
The horizontal drive signal is obtained from an internal
VCO which is running at a frequency of 25 MHz. This
oscillator is stabilised to this frequency by using a 12 MHz
signal coming from the reference oscillator of the
μ
-Controller/Teletext decoder.
The horizontal drive is switched on and off via the soft
start/stop procedure. This function is realised by means of
variation of the T
ON
of the horizontal drive pulses. In
addition the horizontal drive circuit has a ‘low-power
start-up’ function.
The vertical synchronisation is realised by means of a
divider circuit. The vertical ramp generator needs an
external resistor and capacitor. For the vertical drive a
differentialoutputcurrentisavailable.Theoutputsmustbe
DC coupled to the vertical output stage.
In the types which are intended for 90
°
picture tubes the
following geometry parameters can be adjusted:
Horizontal shift
Vertical amplitude
Vertical slope
S-correction
Vertical shift
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