參數(shù)資料
型號(hào)： MC44302AP
廠商： MOTOROLA INC
元件分類： 消費(fèi)家電
英文描述： ADVANCED MULTI-STANDARD VIDEO/SOUND IF
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP28
封裝： PLASTIC, DIP-28
文件頁(yè)數(shù)： 20/28頁(yè)
文件大小： 612K
代理商： MC44302AP
MC44302A
20
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION (continued)
Pin No.
Description
Equivalent Internal Circuit
10
Video Mode Switch
3.0 k
VCC
V1
V2
VCC
2.4 k
5.1 k
PAL 1
PAL 2
SECAM
NTSC
10
Video Mode Switch
A dc voltage at this input selects the proper video AGC and sound
demodulation technique for PAL, SECAM, and NTSC. 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. 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 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 NTSC
selected, AGC and sound muting is the same as in 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. Refer to Table 2.
11
11
AFT Ouput
VCC
3.3
VCC
Digital Slew
Rate Control
To Tuner AFT Input.
IO must be externally
limited < 4.0 mA.
0 to
±
500
μ
A
or
±
2.0 mA
Variable
Reference
Clamp Voltage
20
AFT Output
With detent type tuners, the automatic fine tuning output can be
used to directly control the tuner local oscillator varactor. The
varactor control input must be high impedance in order to maintain
high AFT loop gain with acceptable dynamic response. This
output has a linear sink and source current range of 0 to 500
μ
A,
and is digitally switched to
±
2.0 mA for large frequency errors. The
capacitor from Pin 11 to ground limits the bandwidth of the tuner
local oscillator loop. Digital phase–locked loop tuning systems
can also be controlled with the addition of a varactor diode used
to shift the PLL reference oscillator. Refer to Figures 6, 24, and 25.
12
AFT Mode Switch
VCC
VCC
VCC
12
24 k
24 k
5.1 k
AFT Mode Switch
This input is used to activate the output of the AFT control amplifier
that appears at Pin 11, and to select the control voltage polarity
versus IF frequency. This feature allows the AFT output to work
with all types of varactor tuned local oscillators. With the AFT
Mode Switch input connected to VCC, Pin 11 is placed in a
sourcing mode when the IF carrier frequency is below nominal.
With the AFT Mode Switch input grounded, Pin 11 is placed in a
sinking mode when the IF carrier frequency is below nominal. With
the AFT Mode Switch input disconnected, Pin 11 is internally
clamped to one half of VCC, refer to Figures 6 and 25.
13
VCC
VCC
VCC
RF AGC
Output
10 k
To Tuner
AGC Input
13
RF AGC Output
This output is designed to control a reverse AGC tuner. As the
antenna signal level increases, the voltage at Pin 13 decreases,
causing a gain reduction in the tuner RF stage. An external pull–up
resistor must be added if one is not provided in the tuner. Pin 13
is guaranteed to sink a minimum of 1.0 mA. Note that when
operating with a tuner that requires in excess of 5.6 V, current will
flow into Pin 13 due to conduction of the upper internal clamp
diode.
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