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參數(shù)資料
| 型號： | 935261350112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PDIP32 |
| 封裝： | 0.400 INCH, PLASTIC, SOT-232, SDIP-32 |
| 文件頁數(shù)： | 41/43頁 |
| 文件大小： | 356K |
| 代理商： | 935261350112 |
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1996 Jan 17
7
Philips Semiconductors
Preliminary specication
I2C-bus controlled, alignment-free
PAL/NTSC/SECAM decoder/sync processor
TDA9143
handbook, full pagewidth
PAL
KILLED
PAL
KILLED
PAL
KILLED
NTSC
KILLED
NTSC
KILLED
SECAM
KILLED
Reference crystal
Second crystal
MGE040
PAL
NTSC
PAL
SECAM
c
Fig.3 Search loop of the identification circuit.
Integrated lters
All chrominance bandpass and notch filters, including the
luminance delay line, are an integral part of the IC. The
filters are gyrator-capacitor type filters. The resonant
frequency of the filters is controlled by a circuit that uses
the active crystal to tune the SECAM Cloche filter during
the vertical flyback time. The remaining filters and the
luminance delay line are matched to this filter. The filters
can be switched to either 4.43 MHz, 4.29 MHz or
3.58 MHz. The switching is controlled by the standard
identification circuit. The luminance notch used for
SECAM has a lower Q-factor than the notch used for
PAL/NTSC. The notches are provided with a little preshoot
to obtain a symmetrical step response. In Y/C mode the
chrominance notch filters are bypassed, to preserve full
signal bandwidth. For a CVBS signal the chrominance
notch filters can be bypassed by bus selection of bit TB
(trap bypass). The delay of the colour difference signals
(RY) and (BY) in the chrominance signal path and the
external chrominance delay lines when used, can be fitted
to the luminance signal by I2C-bus in 40 ns steps.
The typical luminance delay can be calculated:
delay
≈ 90 + SAKSBK {170 + 40(FRQTB)} + 160(YD3) +
160(YD2) + 80(YD1) + 40(YD0) [ns].
Colour decoder
The PAL/NTSC demodulator employs an oscillator that
can operate with either crystal (3.6 MHz or 4.4 MHz). If the
I2C-bus indicates that only one crystal is connected, it will
always connect to the crystal on the reference crystal input
(pin 30).
The Hue signal which is adjustable by I2C-bus, is gated
during the burst for NTSC signals.
The SECAM demodulator is an auto-calibrating PLL
demodulator which has two references. The reference
crystal, to force the PLL to the desired free-running
frequency and the bandgap reference, to obtain the
correct absolute value of the output signal. The VCO of the
PLL is calibrated during each vertical blanking period,
when the IC is in search mode or in SECAM mode.
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