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參數(shù)資料
| 型號： | SAA4963 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 信號分離 |
| 英文描述： | Integrated NTSC comb filter |
| 中文描述： | Y/C SEPARATOR IC, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, SOT-146-1, DIP-20 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 116K |
| 代理商： | SAA4963 |
1997 Mar 03
7
Philips Semiconductors
Preliminary specification
Integrated NTSC comb filter
SAA4963
The PLL provides a master clock MCK of 6
×
f
sc
, which is
locked to the subcarrier frequency at FSC (pin 1).
The system clock CL3 (3
×
f
sc
) is obtained from MCK by a
divide-by-two circuit. The 180
°
phase shift is generated by
stopping the divide-by-two circuit for one MCK clock cycle.
The generated clock is a pseudo-line-locked clock that is
referenced to f
sc
. The sync separator generates the
necessary signals H
DET
and V
DET
indicating the line (H)
and the field (V) sync periods.
The input signals of the control and clock processing
(CLOCK CONTROL) are:
H
DET
: analog horizontal pulse from sync separator
V
DET
: analog vertical pulse from sync separator
FSC: subcarrier frequency
SVHS: SVHS control signal.
The output signals are:
CL3: system clock (3
×
f
sc
)
HSEL: line start signal for the delay line
STOPS: forces the IC via the switches S2A and S2B into
the SVHS-mode or into COMB-mode (always
asynchronous).
H
ORIZONTAL AND VERTICAL SYNC SEPARATOR
A built-in sync separator circuit generates the H
DET
and
V
DET
signals from the CVBS input signal. This circuit is still
working properly with a 12 dB attenuated sync in a normal
700 mV black-to-white video input signal (see Fig.5).
C
LAMP
The black level clamping of the video input signals (CVBS
and Y
ext
) is performed by the sync separator stage.
The clamping level is nearly adequate to the voltage at
REFDL (pin 10). The clamp consists of a pre clamp and a
main clamp. Always the signal which is switched to the
output is clamped via the main clamp while the other signal
is pre clamped. This reduces the distortion during
switching from COMB-mode to SVHS-mode and vice
versa.
Table 4
Function of pre clamp and main clamp
S
IGNAL SWITCHES
S2A
AND
S2B
Two switches are included to bypass the comb filter signal
processing. The input video signal C
ext
for the switch S2B
is internally biased.
For the Y
O
output two signals can be selected via S2A.
Table 5
Y
O
output signal
For the C
O
output two signals can be selected via S2B.
Table 6
C
O
output signal
INPUT
COMB-MODE
SVHS-MODE
CVBS
Y
ext
main clamp
pre clamp
pre clamp
main clamp
SVHS
Y
O
OUTPUT SIGNAL
YCOMB (combed luminance)
input Y
ext
MODE
LOW
HIGH
COMB
SVHS
SVHS
C
O
OUTPUT SIGNAL
CCOMB (combed chrominance)
input C
ext
MODE
LOW
HIGH
COMB
SVHS
相關PDF資料 |
PDF描述 |
|---|---|
| SAA4963T | Integrated NTSC comb filter |
| SAA4970T | Economical video processing IC ECOBENDIC |
| SAA4974 | Besic without ADC |
| SAA4974H | Besic without ADC |
| SAA4977H | Besic |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAA4963T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Integrated NTSC comb filter |
| SAA4970T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economical video processing IC ECOBENDIC |
| SAA4974 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Besic without ADC |
| SAA4974H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Besic without ADC |
| SAA4977H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Besic |
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