參數(shù)資料
型號(hào)： TDA9332H
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： I2C-bus controlled TV display processors
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44
文件頁(yè)數(shù)： 29/56頁(yè)
文件大?。?/td> 228K
代理商： TDA9332H
2000 May 08
29
Philips Semiconductors
Preliminary specification
I
2
C-bus controlled TV display processors
TDA933xH series
ATSC signals are transmitted as YP
B
P
R
signals. The colour-difference components P
B
and P
R
are amplitude
corrected versions of B
Y and R
Y:
Y
–
)
0.0722
–
Note that the “YUV” input of the TDA933xH is actually a Y,
(R
Y) and
(B
Y) input. When the TV set has an input
for a YPBPR signal with amplitudes of 0.7 V for all three components, the signals should be amplified to Y,
(B
Y)
and
(R
Y) signals as follows:
0.7
5.
This parameter is not tested during production but is guaranteed by the design and qualified by means of matrix
batches which are made in the pilot production period.
The inputs for RGB-1 and RGB-2 insertion (pins 33 and 38) both supply a small source current to the pins. If the pins
are left open circuit, the input voltage will rise above the insertion switching level.
This parameter is measured at nominal settings of the various controls.
The switching of the OSD (RGB-2) input has two modes, which can be selected via the I
2
C-bus:
a) Fast switching between the OSD signal and the internal RGB signals.
b) Blending (fading) function between the OSD signal and the internal RGB signals. The blending control curve is
given in Fig.4. The blender input is optimized for the blender output of the SAA5800 (ArtistIC).
The saturation, contrast and brightness controls are active on the YUV signals and on the first RGB input signals.
Nominal contrast is specified with the contrast DAC in position 32 DEC, nominal saturation with the saturation DAC
in position 22 DEC. The second RGB input (which is intended to be used for OSD and teletext display) can only be
controlled on brightness.
10. For video signals with a black level that deviates from the back-porch blanking level, the signal is ‘stretched’ to the
blanking level. The amount of correction depends on the IRE value of the signal (see Fig.8). The black level is
detected by means of an internal capacitor. The black level stretcher can be switched on and off via bit BKS in the
I
2
C-bus. The values given in the specification are valid only when the luminance input signal has an amplitude of
1 V (b-w).
11. Because of the 2-point black current stabilization circuit, both the black level and the amplitude of the RGB output
signals depend on the drive characteristic of the picture tube. The system checks whether the returning measuring
currents meet the requirement and adapts the output level and gain of the circuit as necessary. Therefore, the typical
values of the black level and amplitude at the output are just given as an indication for the design of the RGB output
stage.
a) The 2-point black level system adapts the drive voltage for each cathode such that the two measuring currents
have the right value. The consequence is 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 RGB drive levels’.
b) Because of the dependence of the output signal amplitude on the application, the peak-white and soft-clipping
limiting levels have been related to the input signal amplitude.
6.
7.
8.
9.
P
B
1
Y
–
(
-B
)
=
=
P
R
1
–
Y
–
0.2126
)
0.5 R
1.575
Y
–
-R
)
=
=
Y
in,IC
-1
Y
in,TV
×
1.43Y
in,TV
=
=
B
Y
–
(
)
–
in,IC
1.856
--0.7
P
Bin TV
×
2.65
–
P
B in,TV
=
=
R
Y
–
(
)
–
in,IC
0.7
1.575
P
Rin TV
×
2.25
–
P
R in,TV
=
=
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