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參數資料
| 型號： | 935069850112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP52 |
| 封裝： | 0.600 INCH, PLASTIC, SOT-247-1, SDIP-52 |
| 文件頁數： | 3/47頁 |
| 文件大小： | 250K |
| 代理商： | 935069850112 |
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1996 Jan 26
11
Philips Semiconductors
Objective specication
I2C-bus controlled PAL/NTSC TV processors
TDA8376; TDA8376A
To obtain a smooth switching-on and switching-off
behaviour of the horizontal output stage the horizontal
output frequency is doubled during switch-on and
switch-off (slow start/stop). During that time the duty factor
of the output pulse has such a value that maximum safety
is obtained for the output stage
To protect the horizontal output transistor the horizontal
drive is switched off when a power-on reset is detected.
The drive signal is switched on again when the normal
switch-on procedure is followed, i.e. all sub-address bytes
must be sent and, after calibration, the horizontal drive
signal will be released again via the slow start procedure.
When the coincidence detector indicates an out-of-lock
situation the calibration procedure is repeated.
The circuit has a second control loop to generate the drive
pulses for the horizontal driver stage. To prevent the
horizontal output transistor being switched on during
flyback the horizontal drive output is gated with the flyback
pulse.
The vertical sawtooth generator drives the vertical output
and E-W correction drive circuits. The geometry
processing circuits provide control of horizontal shift, E-W
width, E-W parabola/width ratio, E-W corner/parabola
ratio, trapezium correction, vertical shift, vertical slope,
vertical amplitude, and the S-correction. All these controls
can be set via the I2C-bus. The geometry processor has a
differential current output for the vertical drive signal and a
single-ended output for the E-W drive. Both the vertical
drive and the E-W drive outputs can be modulated for EHT
compensation. The EHT compensation pin is also used for
overvoltage protection.
The TDA8376A geometry processor also offers the
possibility for a flexible vertical and horizontal zoom mode
for 16 : 9 applications. Because of this feature an
additional control can be added on the remote control so
that the viewer can adjust the picture.
In addition the de-interlace of the vertical output can be set
via the I2C-bus.
To avoid damage of the picture tube when the vertical
deflection fails, the guard output current of the TDA8350
can be supplied to the sandcastle output. When a failure is
detected the RGB-outputs are blanked and a bit is set
(NDF) in the status byte of the I2C-bus. When no vertical
deflection output stage is connected this guard circuit will
also blank the output signals. This can be overruled by the
EVG bit of subaddress 0A (see Table 1).
7.4
Colour decoder
The colour decoder contains an alignment-free crystal
oscillator, a killer circuit and the colour difference
demodulators. The 90
° phase shift for the reference signal
is made internally. The demodulation angle and gain ratio
for the colour difference signals for PAL and NTSC are
adapted to the standard.
The colour decoder is very flexible. Together with the
SECAM decoder TDA8395 an automatic multistandard
decoder can be designed. In the automatic mode the
SECAM identification is accepted only when the vertical
frequency is 50 Hz. In the forced mode the system can
also identify signals with a vertical frequency of 60 Hz.
Which standard the IC can decode depends on the
external crystals. If a 4.4 MHz and a 3.5 MHz crystal are
used PAL 4.4, NTSC 4.4, NTSC 3.5 and PAL 3.5 can be
decoded. If two 3.5 MHz crystals are used PAL N and M
can be decoded. If one crystal is connected only
PAL/NTSC 4.4 or PAL/NTSC 3.5 can be decoded. The
crystal frequency of the decoder is used to tune the line
oscillator. Therefore the value of the crystal frequency
must be given to the IC via the I2C-bus. For a reliable
calibration of the horizontal oscillator it is very important
that the crystal indication bits (XA and XB) are not
corrupted (see Table 6). For this reason the crystal bits
(SXA and SXB) can be read in the output bytes so that the
software can check the I2C-bus transmissions
(see Table 38).
7.5
RGB output circuit and black-current
stabilization
The colour-difference signals are matrixed with the
luminance signal to obtain the RGB-signals. For the
RGB-inputs linear amplifiers have been chosen so that the
circuit is suited for signals coming from the SCART
connector. The RGB2 inputs (pins 14 to 17) have priority
over the RGB1 inputs (pins 23 to 26). Both fast blanking
inputs can be blocked by I2C-bus controls. The contrast
and brightness controls operate on internal and external
signals.
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