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SAA4963

Integrated NTSC comb filter

Philips Electronics 

Philips Semiconductors

Integrated NTSC comb filter

Preliminary specification

SAA4963

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,

Cext (pin 7) is bypassed to CO (pin 9) and Yext (pin 14) is

bypassed to YO (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 fsc (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 function

SVHS

LOW

HIGH

SELECTED MODE

COMB

SVHS (PLL and clock processing stopped)

The PLL and the clock processing are always stopped if

the selected level for SVHS is applied to SVHS

(independent of the vertical pulse).

VCCA, VCCO, VDDD AND VCCPLL (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.

Cext (PIN 7)

Input for an external chrominance signal which is

correlated with the external VBS signal in SVHS-mode.

CO (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 Cext if the IC is forced into the SVHS-mode.

In COMB-mode the output is delayed by an additional

processing delay.

Table 2 CO output signal

MODE

CO OUTPUT SIGNAL

COMB comb filtered chrominance signal

SVHS external chrominance signal from Cext input

REFDL (PIN 10)

Decoupling capacitor for the delay line reference voltage.

YO (PIN 11)

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

Yext if the IC is forced into SVHS-mode. In COMB-mode

the output is delayed by an additional processing delay.

Table 3 YO output signal

MODE

COMB

SVHS

YO OUTPUT SIGNAL

comb filtered luminance signal

external (C)VBS signal from Yext input

1997 Mar 03

5

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