MC44144 datasheet(4/8 Pages) MOTOROLA

Part #	MC44144

Description	SUBCARRIER PHASE?밚OCKED LOOP

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Manufacturer	MOTOROLA [Motorola, Inc]

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MC44144

4

MOTOROLA ANALOG IC DEVICE DATA

PIN FUNCTION DESCRIPTION

Name

Representative Circuitry

Description

Expected Waveforms

Subcarrier

Output

1

5.0k

200

VCC

Subcarrier Output. A

phase–locked reference of the

PAL or NTSC color burst is

output at this pin.

A 300 mVpp square wave is output.

Some high frequency content is

present.

Ground

2

Circuit Ground

Phase

Detector

Output

3

1.0k

31k

33k

2.5V

The error current from the

phase detector is output at this

pin. A filter circuit should be

connected at this pin.

A beat waveform, showing both

horizontal period and half the

subcarrier period, is present.

Vlock

Line Period

1/2 Subcarrier Period

4X Sub Xtal

4

gm

2.0k

400

VCC

Vref

gm

Crystal Oscillator Pin. A 4X

subcarrier parallel resonant

crystal, in series with a 5.0 to

25 pF trimmer capacitor

provides the resonant element

for the Voltage Controlled

Crystal Oscillator (VCXO).

Approximately 40 mVpp. A scope

probe will disturb the frequency of

oscillation.

4X Subcarrier

Output (or

Black Burst)

5

5.0k

VCC

Buffered output from the 4X

voltage controlled oscillator.

The sinusoidal 4Xfsc oscillator output

is available at this pin.

The output is nominally:

525 mVpp for NTSC,

425 mVpp for PAL.

Composite

Video Input

(Black Burst,

Continuous

Wave, or

Composite

Chroma

can also be

applied)

6

22k

VCC

Composite Video Input. Color

burst from the video present at

this pin is used as a reference

to phase lock the VCXO.

Positive or negative video may

be used.

Composite video should be applied

at this pin. The color burst

amplitude of the input video should

be at least 50 mV, but no more than

1000 mV. The waveform at this pin

should not exceed ground or VCC.

VCC

GND

2.6V

Burst Gate

Input

7

VCC

22k

Input for the phase detector

gate pulse. TTL compatible.

The threshold is nominally

2.6V.

A positive going gate pulse should

be applied at this pin. The Burst Gate

input should envelope the color

burst.

Pin 7

2.2V

Pin 6

VCC

8

Power Supply Pin. 5.0 Vdc

should be applied at this pin.

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