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TDA8366 数据表(PDF) 10 Page - NXP Semiconductors |
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TDA8366 数据表(HTML) 10 Page - NXP Semiconductors |
10 / 48 page January 1995 10 Philips Semiconductors Objective specification I2C-bus controlled PAL/NTSC TV processor TDA8366 output for the vertical drive signal and a single-ended output for the EW drive. Both the vertical drive and the EW drive outputs can be modulated for EHT compensation. The EHT compensation pin is also used for overvoltage protection. The geometry processor also offers the possibilities for vertical compression (for display of 16 : 9 pictures on a 4 : 3 screen) and vertical expansion (for display of 4 : 3 pictures on a 16 : 9 screen with full picture width, or for display of ‘letter-box’ transmissions on a 4 : 3 screen with full picture height). For the expand mode it is possible to shift the picture vertically (only one fixed position). Also 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 means of the EVG bit of subaddress 0A (see Table 1). Integrated video filters The circuit contains a chrominance bandpass and trap circuit. The chrominance trap filter in the luminance path is designed for a symmetrical step response behaviour. The filters are realized by means of gyrator circuits and they are automatically tuned by comparing the tuning frequency with the crystal frequency of the decoder. The luminance delay line and the delay for the peaking circuit are also realized by means of gyrator circuits. It is possible to connect a Colour Transient Improvement (CTI) or Picture Signal Improvement (PSI) IC to the TDA8366. Therefore the luminance signal which has passed the filter and delay line circuit is externally available. The output signal of the transient improvement circuit must be supplied to the luminance input circuit. When the CTI function is not required the two pins must be AC-coupled. Video switches The circuit has two CVBS inputs and an Super-Video Home System (S-VHS) input. The input can be chosen by the I2C-bus. The input selector also has a position in which CVBSEXT is processed, unless there is a signal on the S-VHS input. When the input selector is in this position it switches to the S-VHS input if the S-VHS detector detects sync pulses on the S-VHS luminance input. The S-VHS detector output can be read by the I2C-bus. When the S-VHS option is not used the luminance input can be used as a second input for external CVBS signals. The choice is made via the CVS-bit (see Table 1). The video switch circuit has two outputs which can be programmed in a different way. The input signal for the decoder is also available on the TXT output. Therefore this signal can be used to drive the teletext decoder and the SECAM add-on decoder. The signal on the PIP output can be chosen independent of the TXT output. If S-VHS is selected for one of the outputs the luminance and chrominance signals are added so that a CVBS signal is obtained again. 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. 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. |
类似零件编号 - TDA8366 |
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类似说明 - TDA8366 |
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