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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)： | 26/40頁 |
| 文件大小： | 491K |
| 代理商： | MC44002P |
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MC44002 MC44007
26
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION (continued)
Pin
Description
Equivalent Internal Circuit
13
VCC
Gnd
50 k
120 k
Line
Flyback
Pulse
180 k
Horizontal Flyback Input
Flyback sensing input taken from the line output transformer. These
pulses are used by the 2nd horizontal loop for H–Phase control. A
positive going pulse from 0 to 5.0 V amplitude is needed for correct
operation. The internal impedance of the pin is about 50 k
and an
external attenuating series resistor of around 120 k
will also be
needed.
14
0.1
VCC
Gnd
Horizontal Loop 2 Filter
Components at this pin filter the output of the phase detector in the
2nd horizontal loop. A simple external filter consisting of a 0.1
μ
F
capacitor is required.
15
VCC
Gnd
100 k
0.1
470
pF
Horizontal Loop 1 Filter
Horizontal PLL loop time constant. Components at this pin filter the
output of the phase detector is in the 1st horizontal loop. The value of
RC time constant is selected with external components to give a
smooth recovery after the field interval disturbance and to ensure
optimum performances in the presence of noise.
17
18
19
Gnd
To R, G, B
Amplifiers
VCC
100
RGB Outputs
The R, G and B drives are current rather than voltage due to the
limited headroom available with the 5.0 V supply line. The outputs
themselves consist of open–collector transistors and these are used
to drive the virtual ground point of the high voltage cathode amplifiers
20
5.0 V
220
390
Feedback
Gnd
VCC
Feedback
Current feedback sense derived from the video output amplifiers. The
currents from all three guns are summed together as each is driven
sequentially with know current pulses during the field interval. This
feedback is then compared with internally set–up references. A low
value ceramic capacitor to ground may be fitted close to this pin to
help stabilize the control loops.
A secondary function of this pin is for peak beam current limiting.
When the feedback voltage during picture time becomes too great (i.e.
too high beam current), a threshold at VCC + 3.0 Vbe is exceeded at
which time a flag is sent to the MCU. The MCU then has to carry out
the function of peak beam limiter by e.g. reducing contrast until the
flag goes off. The threshold current is set externally with a fixed
resistor value.
21
Gnd
Fast–Commutate
Input
VCC
Fast Commutate
A very fast active high switch (transition time 10 ns) used with text on
the RGB inputs, for overlaying text on picture. This hardware switch
may be enabled and disabled in software.
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