MC44302AP View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC44302AP Datasheet PDF : 28 Pages
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MC44302A
Table 1. Audio Input/Audio–Video Switch
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Mode
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Audio 1
Inputs
to Pin 3
AC Signal
External
Audio
DC Level
(VCC = 5.0 V)
Open
or
3.4 V to 5.0 V
Audio1
Constant
Pin 24
Variable2
Pin 27
Internal Audio
(AM or FM)
Internal Audio
(AM or FM)
Outputs
Video
Negative
Pin 5
Positive
Pin 6
Negative Video
Positive Video
with
White Spot Inversion
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Audio 2
External
Audio
22 kΩ to Ground
or
1.8 V to 2.2 V
Internal Audio
(AM or FM)
External Audio
Negative Video
Positive Video
with
White Spot Inversion
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Video 1
–
3.3 kΩ to Ground
or
0.6 V to 0.9 V
Internal Audio
(AM or FM)
Internal Audio
(AM or FM)
Negative Video
Positive Video
with
White Spot Inversion
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Video 2
–
Grounded
or
0 V to 0.03 V
Internal Audio
(AM or FM)
Internal Audio
(AM or FM)
Positive Video
with
White Spot Inversion
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ NOTES: 1. Refer to Table 2 to determine the active demodulator (AM and or FM) and the associated audio output pins.
2. The Variable output audio level is controlled by Pin 1.
Negative Video
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Television Standard
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ System
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PAL 1
Video
Modulation
Polarity
Negative
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PAL 2
Negative
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ SECAM
Positive
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ NTSC
Negative
Table 2. Television Standard Modes
Mode Selection
AGC
Pin 10
Voltage
(V)
4.0 to 5.0
3.2 to 4.0
1.9 to 3.0
Ground
Pin 16
DC
Loading
Open
Open
Open
Open
Reference
and
Method
Black Level
Sync Tip Keyed
Black Level
Sync Tip Keyed
Black Level
Back Porch Keyed
White Level
Peak Detected Video
Black Level
Sync Tip Keyed
Time
Constant
Pin #
14
14
14
7
14
Sound
IF and
Modulation
Active Inhibited
FM
AM
FM
AM
AM
FM
AM & FM
–
Audio
Output
Pin #
24, FM
27, FM
24, FM
27, FM
24, AM
27, AM
24, AM
27, FM
Multi–Standard Operating Modes
The MC44302A is designed to operate properly with PAL
(B, G, I,) SECAM (L), and NTSC (M) television transmission
standards. There are two multifunction inputs that are used
to select the proper control methods for video
demodulation, sound intercarrier demodulation, and AGC.
This keeps the sense of the video signal at the outputs the
same, whether positive or negative modulation is being
received. Refer to Table 2 and the following operating
description.
The PAL, NTSC, and SECAM standard are each selected
by applying a specific dc voltage level to the Video Mode
Switch at Pin 10. With PAL 1 selected, AGC is keyed on the
sync pulse by the horizontal PLL which is locked to the
flyback or video sync pulse present at Pin 17. The FM sound
IF and detector is active with the demodulated audio
appearing at Pins 24 and 27. The PAL 2 selection is identical
to PAL 1 with the addition of sound muting when the
Acquisition Circuit is unlocked or vertical sync is absent. With
SECAM selected, the video level is established by both, a
MOTOROLA ANALOG IC DEVICE DATA
long time constant peak white detector, and a back porch
keyed AGC that corrects for transmitted black level errors
while maintaining fast AGC response. The AM sound
detector is active with the demodulated audio appearing at
Pins 24 and 27. With NTSC selected, AGC and sound muting
is the same as for PAL 1 mode. The FM and AM detectors are
both active with the FM output at Pin 27 and the AM output at
Pin 24. The AM output can be used to obtain the sync signal,
in suppressed sync scrambling systems, that is amplitude
modulated on the sound carrier.
Signal Acquisition and AFT
The automatic fine tuning (AFT) portion of this integrated
circuit is unconventional in form. AFT control is derived by
amplifying the phase detector error voltage and applying it to
the tuner local oscillator (LO) after phase lock is established.
This method eliminates the need for a discriminator coil along
with the associated alignment, and the potential for IF
instability due to coil radiation.
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