Philips Semiconductors
Preliminary specification
Integrated NTSC comb filter
FEATURES
•
One chip NTSC comb filter
•
Time discrete but continuous amplitude signal
processing with analog interfaces
•
Internal delay lines, filters, clock processing and signal
switches
•
Alignment-free
•
Few external components.
QUICK REFERENCE DATA
SYMBOL
V
CCA
V
DDD
V
CCO
V
CCPLL
I
CCO
I
DDD
I
CCA
I
CCPLL
V
13(p-p)
V
14(p-p)
V
7(p-p)
V
1(p-p)
V
11(p-p)
V
9(p-p)
analog supply voltage
digital supply voltage
analog supply voltage output buffer
analog supply voltage PLL
analog supply current output buffer
digital supply current
analog supply current
analog supply current PLL
CVBS input signal (peak-to-peak value)
luminance input signal (peak-to-peak value)
chrominance input signal (peak-to-peak value)
subcarrier input signal (peak-to-peak value)
luminance output signal (peak-to-peak value)
chrominance output signal (peak-to-peak value)
PARAMETER
MIN.
4.75
4.75
4.75
4.75
−
−
−
−
0.7
0.7
−
100
0.6
−
5
5
5
5
35
3
10
1.5
1
1
0.7
200
1
0.7
TYP.
GENERAL DESCRIPTION
SAA4963
The SAA4963 is an alignment-free one chip comb filter
compatible with NTSC M systems.
MAX.
5.5
5.5
5.5
5.5
45
6
17
2.5
1.4
1.4
1
400
1.54
1.1
V
V
V
V
UNIT
mA
mA
mA
mA
V
V
V
mV
V
V
ORDERING INFORMATION
TYPE
NUMBER
SAA4963
SAA4963T
PACKAGE
NAME
DIP20
SO20
DESCRIPTION
plastic dual in-line package; 20 leads (300 mil)
plastic small outline package; 20 leads; body width 7.5 mm
VERSION
SOT146-1
SOT163-1
1997 Mar 03
2
Philips Semiconductors
Preliminary specification
Integrated NTSC comb filter
FUNCTIONAL DESCRIPTION
Functional requirements
The NTSC comb filter processes the video standard
NTSC M. For SVHS signals the input signals are
bypassed to the output without processing by selecting the
SVHS mode.
A sync separation circuit is incorporated to generate
control signals for the internal clock processing. With a
sync compression of up to 12 dB (see Fig.5) the sync
separator works properly.
The IC is controlled via the pin SVHS (pin 2) which forces
the IC into the SVHS mode (bypass) if the comb filter
function is not desired. It is possible to select the following
modes:
COMB-mode: Luminance and chrominance comb filter
function active, if SVHS mode not active
SVHS-mode: No IC function active, all clocks inactive,
C
ext
(pin 7) is bypassed to C
O
(pin 9) and Y
ext
(pin 14) is
bypassed to Y
O
(pin 11). This mode is forced via SVHS
(pin 2).
The mode changes from SVHS to COMB and vice versa
are always performed asynchronously with respect to the
vertical blanking interval.
Pin description
FSC (
PIN
1)
Input for the reference frequency f
sc
(see note 3 of Chapter
“Characteristics”). For SVHS signals the signal
performance can be increased by switching the input
signal at FSC off.
SVHS (
PIN
2)
Input signal that controls the operation mode. An internal
low-pass filter suppresses the subcarrier frequencies.
Thus applications are supported where the operation
mode (COMB or SVHS) is controlled by the DC level of the
FSC input signal at pin 1. For those applications the SVHS
input can be externally connected to FSC (pin 1).
Table 1
SVHS
LOW
HIGH
COMB
SVHS (PLL and clock processing stopped)
SVHS function
SELECTED MODE
Y
O
(
PIN
11)
SAA4963
The PLL and the clock processing are always stopped if
the selected level for SVHS is applied to SVHS
(independent of the vertical pulse).
V
CCA
, V
CCO
, V
DDD
AND
V
CCPLL
(
PINS
4, 6, 15
AND
18)
Supply voltages.
AGND, OGND, DGND
AND
PLLGND (
PINS
5, 8,
16
AND
17)
Ground connection. AGND is used as signal reference for
all analog input and output signals.
C
ext
(
PIN
7)
Input for an external chrominance signal which is
correlated with the external VBS signal in SVHS-mode.
C
O
(
PIN
9)
Chrominance output signal. This output delivers the comb
filtered chrominance from the CVBS signal in
COMB-mode or the external chrominance signal from the
input C
ext
if the IC is forced into the SVHS-mode.
In COMB-mode the output is delayed by an additional
processing delay.
Table 2
MODE
COMB
SVHS
C
O
output signal
C
O
OUTPUT SIGNAL
comb filtered chrominance signal
external chrominance signal from C
ext
input
REFDL (
PIN
10)
Decoupling capacitor for the delay line reference voltage.
VBS output signal. This output delivers the comb filtered
luminance signal (including synchronization pulses) in
COMB-mode or the external (C)VBS signal from the input
Y
ext
if the IC is forced into SVHS-mode. In COMB-mode
the output is delayed by an additional processing delay.
Table 3
Y
O
output signal
Y
O
OUTPUT SIGNAL
comb filtered luminance signal
external (C)VBS signal from Y
ext
input
MODE
COMB
SVHS
1997 Mar 03
5
Microchip MCU
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