參數(shù)資料
型號： MC44002P
廠商： MOTOROLA INC
元件分類： 消費家電
英文描述： CHROMA 4 VIDEO PROCESSOR
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 16/40頁
文件大?。?/td> 491K
代理商： MC44002P
MC44002 MC44007
16
MOTOROLA ANALOG IC DEVICE DATA
PAL/NTSC
(MCU)
29
Luma
36
B-Y
37
R-Y
39
1
B-Y
R-Y
SECAM
Decoder
32
33
Oscillator
14.3MHz
17.7MHz
C
C
PLL
ACC
PAL/NTSC Decoder
4.4/8.8MHz
System Select
Hue Controls
V
U
Ident
(MCU)
4.4/8.8MHz
Luma
Delay
Line
Ident Data
(MCU)
Luma–Chroma Filters
t1, t2
Video 2
Video 1
38
Figure 8. Chroma Decoder
AGC
Q
S-VHS
Crystal
Select
S-VHS
Delay ADJ
To Color
Difference
Stage
11
SECAM
Cal
Loop
2
40
Peaking
Syn
Sep
t3
Input
Select
Y1
NOTES:
SECAM decoding
available in the MC44002 only.
The actual decision as to a signal’s identity is made by the
MCU based on data provided by 3 flags returned to it,
namely: ACC Active, PAL Identified, and SECAM Identified.
Control bits SSA–SSD must be sent to set the decoder to
the correct standard.
This allows a maximum of flexibility, since the software
may be written to accommodate many different sets of
circumstances. For example, channel information could be
taken into account if certain channels always carry signals in
the same standard. Alternatively, if one standard is never
going to be received, the software can be adapted to this
circumstance. If none of the flags are on, color killing can be
implemented by the MCU. This occurs if the net Ident Signal
is too low, or if the ACC circuit is inactive due to too low a
signal level.
The demodulated color difference signals now enter the
Hue control section, where selection is made between
PAL/NTSC and SECAM outputs. The Hue control is simply
realized by altering the amplitudes of both color difference
signals together. Hue control is only a requirement in NTSC
mode and would not normally be used for other standards.
The function is usually carried out prior to demodulation of
the chroma by shifting the phase of the subcarrier reference,
causing decoding to take place along different axes. In the
MC44002/7, Hue control is performed on the already
demodulated color difference signals. A proportion of the R-Y
signal is added or subtracted to the B-Y signal and
vice-versa. This has the same effect as altering the reference
phase. If desired, the MC44002/7 can apply the Hue control
to simple PAL signals.
After manipulation by the Saturation and Hue controls, the
color difference signals are finally filtered to reduce any
remaining subcarrier and multiplier products. Before leaving
the chip at Pins 36 and 37, the signals are blanked during line
and frame intervals. The 64
μ
s chroma delay line is carried
out by a companion device, the MC44140.
SECAM Decoder (MC44002 only)
The SECAM signal from the high-pass filter enters tightly
controlled AGC amplifiers wrapped around a cloche filter
which is a sampled recursive type, with the AGC derived from
a signal squarer. Next, the signal is blanked during the
calibration gate period and a reference 4.43 MHz is inserted
during this time. The SECAM signal is then passed through a
limiter.
The frequency demodulator function is carried out by a
frequency-locked-loop (F.L.L.). This consists of three
components: a tracking filter, a phase detector and a loop
filter. The center frequency of the tracking filter depends on
three factors: internal R-C product, ADJUST voltage, and
TUNING voltage. The tracking filter is dynamically tuned by
the TUNING feedback from the loop-filter forming the F.L.L.
The ADJUST control calibrates the F.L.L. and compensates
for variations in the R-C product. After the F.L.L., the color
difference signals are passed to another block where several
functions are carried out. The signals are de-emphasized
and outputs are provided to the Ident section. Another
function of this section is to generate the ICOMP signal used
for calibrating the F.L.L. This signal is blanked during the
H-IG period to ensure that (R-Y) and (B-Y) output signals
have a clean dc level for clamping purposes.
In addition, components are added to compensate for the
R-C product, and tuning offsets are introduced during the
active lines for F0R/F0B.
Calibration of the F.L.L. takes place during every field
blanking interval, starting from field retrace and ending just
before the SECAM vertical Ident sequence (bottles). The
calibration current ICAL is derived from ICOMP during the
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