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)： 23/28頁(yè)
文件大?。?/td> 612K
代理商： MC44302AP
MC44302A
23
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION (continued)
Pin No.
Description
Equivalent Internal Circuit
22
Gnd
22
Gnd
This pin is the internal circuit ground. Care must be taken with the
printed circuit board layout to provide a continuous sea of copper
around the IC.
23
VCC
5.5 k
VCC
Sound Input (AM)
23
From Ceramic Sound
IF Filter at Pin 28
Sound Input (AM)
This pin is the input of the AM IF. The intercarrier sound output at
Pin 28 connects to this input through a ceramic bandpass filter.
The AM detector is active in SECAM and NTSC modes. Refer to
Table 2.
24
VCC
VCC
Audio Output
(Constant)
24
200
1.0 mA
Audio Output (Constant)
This is the constant audio output. The audio source is controlled
by the mode selection of Pin 3. Refer to the description of Pin 3,
and to Tables 1 and 2.
25
330
0.01
VCC
25
5.0 V
VCC
This pin is the positive supply of the video/sound IF IC. The IC is
functional over a minimum range of 4.75 V to 5.5 V and requires
100 mA. Operation from higher input voltages is possible with a
preregulator. For optimum performance, it is recommended that
circuit board layout contains dual power supply bypass capacitors
with short leads connected directly to the VCC pin and ground.
26
VCC
VCC
Sound Quadrature Coil (FM)
26
VCC
VCC
L3
R28
C25
Reactance Stage
Representation
Sound Quadrature Coil (FM)
The sound quadrature tank components connect from this pin to
VCC. The internal circuitry is designed to eliminate the time
consuming alignment procedure by self tuning to the sound
intercarrier frequency. This allows the use of economical fixed
value components for a specific frequency or for a range of
frequencies. The internal tuning capacitance that is placed across
the tank ranges from 0.25 pF to 19 pF. Refer to Figures 9, 10, and
Table 3 to select the proper component values for C25, R28, and L3.
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