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參數(shù)資料
| 型號(hào)： | TDA935X |
| 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(yè)數(shù)： | 125/140頁(yè) |
| 文件大?。?/td> | 570K |
| 代理商： | TDA935X |
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1999 Sep 28
125
Philips Semiconductors
Preliminary Device Specification
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA935X/6X/8X series
The 2-point black level system adapts the drive voltage for each cathode in such a way that the 2 measuring currents
have the right value. This has the consequence that a change in the gain of the output stage will be compensated
by a gain change of the RGB control circuit. Because different picture tubes may require different drive voltage
amplitudes the ratio between the output signal amplitude and the inserted measuring pulses can be adapted via the
I
2
C-bus. This is indicated in the parameter Adjustment range of the ratio between the amplitudes of the RGB drive
voltage and the measuring pulses’.
Because of the dependence of the output signal amplitude on the application the soft clipping limiting has been
related to the input signal amplitude.
50. For the alignment of the picture tube the vertical scan can be stopped by means of the VSD bit. In that condition a
certain black level is inserted at the RGB outputs. The value of this level can be adjusted by means of the brightness
control DAC. An automatic adjustment of the V
g2
of the picture tube can be realised by using the WBC and HBC bits
in output byte 01. For a black level feedback current between 2 and 5
μ
A the WBC = 1, for a higher or lower current
WBC = 0. Whether the current is too high or too low can be found from the HBC bit.
51. When the reproduction of 4 : 3 pictures on a 16 : 9 picture tube is realised by means of a reduction of the horizontal
scan amplitude the edges of the picture may slightly be disturbed. This effect can be prevented by adding an
additional blanking to the RGB signals. The blanking pulse is derived form the horizontal oscillator and is directly
related to the incoming video signal (independent of the flyback pulse). The additional blanking overlaps the normal
blanking signal with about 1
μ
s on both sides. This blanking is activated with the HBL bit.
52. Signal-to-noise ratio (S/N) is specified as peak-to-peak signal with respect to RMS noise (bandwidth 5 MHz).
53. When the black-current stabilization loop is switched off (AKB = 1) the WPA control range is reduced to
±
1 dB.
54. This is a current input. The start-up procedure is as follows.
When the TV receiver is switched-on the RGB outputs are blanked and the black-current loop will try to adjust the
picture tube to the right bias levels. The RGB drive signals are switched-on as soon as the black current loop is
stabilised. This results in the shortest switch-on time.
When this switch-on system results in a visible disturbance of the picture it is possible to add a further switch-on delay
via a software routine. In that case the RGB outputs must be blanked by means of the RBL bit. As soon as the black
current loop is stabilised the BCF-bit is set to 0 (output byte 01). This information can then be used to switch-on the
RGB outputs with some additional delay.
55. The beam current limiting and the vertical guard function have been combined on this pin. The beam current limiting
function is active during the vertical scan period.
56. During switch-off the magnitude of the discharge current of the picture tube is controlled by the black current loop.
Dependent on the setting of the OSO bit the vertical scan can be stopped in an overscan position during that time so
that the discharge is not visible on the screen. The switch-off procedure is as follows:
a) The vertical scan and retrace are completed
b) The soft-stop procedure is started with a reduction of the T
ON
of the output stage from nominal to zero
c) The fixed beam current is forced via the black current loop
d) If OSO = 1 the vertical deflection stays in the overscan position
e) If OSO = 0 the vertical deflection will keep running during the switch-off time
Table 121
Some examples for the FM-PLL filter
BL
3dB
(kHz)
100
160
C
S
(nF)
4.7
4.7
C
P
(pF)
820
330
R (k
)
2.7
3.9
ν
0.5
0.5
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