tda933xh NXP Semiconductors, tda933xh Datasheet - Page 29

• Manufacturer Part Number: tda933xh
• Description: Tda933xh Series I2c-bus Controlled Tv Display Processors
• Manufacturer: NXP Semiconductors

Philips Semiconductors
5. This parameter is not tested during production but is guaranteed by the design and qualified by means of matrix
6. 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
7. This parameter is measured at nominal settings of the various controls.
8. The switching of the OSD (RGB-2) input has two modes, which can be selected via the I
9. The saturation, contrast and brightness controls are active on the YUV signals and on the first RGB input signals.
10. For video signals with a black level that deviates from the back-porch blanking level, the signal is ‘stretched’ to the
11. Because of the 2-point black current stabilization circuit, both the black level and the amplitude of the RGB output
12. The bandwidth of the video channels depends on the capacitive load at the RGB outputs. For 2f
2002 Jun 04
I
2
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:
batches which are made in the pilot production period.
are left open circuit, the input voltage will rise above the insertion switching level.
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
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.
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
1 V (b-w).
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
b) Because of the dependence of the output signal amplitude on the application, the peak-white and soft-clipping
c) The signal amplitude at the RGB outputs of the TDA933xH depends on the gain of the RGB amplifiers. The gain
applications, external (PNP) emitter followers on the RGB outputs of the TDA933xH are required, to avoid reduction
of the bandwidth by the capacitance of the wiring between the TDA933xH and the RGB power amplifiers on the
picture tube panel. If emitter followers are used, it should be possible to obtain the bandwidth figures that are
mentioned for 10 pF load capacitance.
–
–
2
C-bus controlled TV display processors
C-bus. The values given in the specification are valid only when the luminance input signal has an amplitude of
B Y
R Y
given in Fig.4. The blender input is optimized for the blender output of the SAA5800 (ArtistIC).
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
limiting levels have been related to the input signal amplitude.
of the RGB amplifiers should be 35 to get the nominal signal amplitude of 2 V (b-w) at the RGB outputs for a
cathode drive level of 70 V (b-w) and the nominal setting of the drive level bits (CL
–
–
Y
2
in,IC
in,IC
C-bus. This is indicated in the parameter ‘Adjustment range of RGB drive levels’.
in,IC
=
=
=
------- -
0.7
1.856
-------------- -
1.575
-------------- -
1
0.7
0.7
Y
in,TV
P
P
Bin TV
Rin TV
=
=
=
–
–
2.65
1.43Y
2.25
P
P
B in,TV
in,TV
R in,TV
29
3210
TDA933xH series
2
C-bus:
= 1000, see Table 15).
Preliminary specification
H
or VGA