- 您現(xiàn)在的位置：買賣IC網 > PDF目錄372109 > SAA4963T (NXP SEMICONDUCTORS) Integrated NTSC comb filter PDF資料下載
參數(shù)資料
| 型號： | SAA4963T |
| 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, PDSO20 |
| 封裝： | 7.50 MM, PLASTIC, MS-013AC, SOT-163-1, SO-20 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 116K |
| 代理商： | SAA4963T |
1997 Mar 03
6
Philips Semiconductors
Preliminary specification
Integrated NTSC comb filter
SAA4963
CSY (
PIN
12)
Sync top capacitor for the sync separator.
CVBS (
PIN
13)
Input for the CVBS signal in COMB-mode.
Y
EXT
(
PIN
14)
Input for an external luminance signal in SVHS-mode.
REFBP (
PIN
20)
Decoupling capacitor for the band-pass filter reference
voltage.
Internal functional description
S
WITCHED CAPACITOR DELAY LINE
Delays the CVBS input signal by 1 line. Input signals for
the delay lines are the CVBS signal, the clock CL3 (3
×
f
sc
)
and the control signal HSEL.
Output signals are the non-delayed and the 1-line delayed
CVBS signal.
S
WITCHED CAPACITOR
B
AND
-P
ASS
F
ILTERS
(BPF
S
)
The comb filter input BPFs attenuate the low frequencies
to guarantee a correct signal processing within the
comb filter.
The comb filter output BPF reduces the alias components
that are the result of the signal processing within the
comb filter.
C
HROMINANCE COMB FILTER
Separates the chrominance from the band-pass filtered
CVBS signal.
D
ELAY COMPENSATION
Compensates the internal processing time of the
band-pass filters and the chrominance comb filter section.
L
UMINANCE COMB FILTER
The comb filtered luminance output signal is obtained by
adding the delayed CVBS signal and the inverted comb
filtered chrominance signal.
L
OW
-
PASS
F
ILTER
I
NPUT
(LPFI)
Analog input low-pass filter to reduce the outband
frequencies of EMC. The input low-pass filter is included in
the signal path.
L
OW
-
PASS
F
ILTER
O
UTPUTS
(LPFO1
AND
LPFO2)
Two different types of output low-pass filters LPFO1 and
LPFO2 are necessary to get equal signal delays within the
luminance path and the chrominance path (important for
good transient behaviour). The low-pass output filter type
LPFO1 is used for the luminance output while LPFO2 is
used for the chrominance output. The filters are analog 3rd
order elliptic low-pass filters that convert the output signals
from the time discrete to the time continuous domain
(reconstruction filter).
LPF
CONTROL
Automatic tuning of the low-pass filters is achieved by
adjusting the filter delays. The control information for all
filters (CONT1 and CONT2) is derived from a built-in
reference filter (LPFO1-type) that is part of a control loop.
The control loop tunes the reference filter delay and thus
all other filter delays to a time reference derived from the
system clock CL3.
C
ONTROL AND CLOCK PROCESSING
(CLOCK CONTROL)
The control and clock processing block consists of the
sub-blocks PLL, clock processing and mode control. Only
if the input level at SVHS (pin 2) selects the COMB mode
the PLL and the clock processing are released for
operation.
Main tasks of the control and clock processing are:
Clock generation of system clock CL3
Delay line start control
Mode control.
The signal processing is based on a 3
×
f
sc
system clock
(CL3), that is generated by the clock processing from the
f
sc
-signal at FSC (pin 1) via a PLL. A clock phase
correction of 180
°
is necessary every line because the
subcarrier frequency divided by the line frequency results
not in an integer value. Additionally the clock processing is
synchronized fieldwise by the H-signal (correction of line
frequency instabilities).
相關PDF資料 |
PDF描述 |
|---|---|
| SAA4970T | Economical video processing IC ECOBENDIC |
| SAA4974 | Besic without ADC |
| SAA4974H | Besic without ADC |
| SAA4977H | Besic |
| SAA4978 | Picture Improved Combined Network PICNIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SAA4978 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Picture Improved Combined Network PICNIC |
發(fā)布緊急采購，3分鐘左右您將得到回復。