參數(shù)資料
型號(hào)： MC44BC374CD
廠商： MOTOROLA INC
元件分類： 消費(fèi)家電
英文描述： PLL Tuned UHF and VHF Audio/Video High Integration Modulator
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO16
封裝： SO-16
文件頁(yè)數(shù)： 19/30頁(yè)
文件大?。?/td> 915K
代理商： MC44BC374CD
Modulator Description
MOTOROLA
MC44BC373C/374C Technical Data
For More Information On This Product,
Go to: www.freescale.com
19
13.8
PLL Section
The reference divider is a fixed divide-by-128, resulting in a reference frequency of 31
.
25KHz with a
4
.
0MHz crystal. The 31
.
25KHz reference frequency is used for both UHF and Sound PLLs.
The prescaler is a fixed divide-by-8 and is permanently engaged.
The programmable divider division-ratio is controlled by the state of control bits N0 to N11.
The divider-ratio N for a desired frequency F (in MHz) is given by:
with:
Programming a division-ratio N=0 is not allowed.
13.9
Logic Output Port
The LOP pin is used to control any logic function. The primary applications are to control an external
attenuator or an external switch, between the antenna input and TV output.
A typical attenuator application with PIN diode is shown. The LOP pin is used to switch the PIN
attenuator depending on the signal strength of the Antenna Input, thereby reducing the risks of
Intermodulation in certain areas. The LOP may also be used as an OFF position bypass switch or for other
logic functions in the application.
Figure 6. Attenuator Application with PIN Diode
13.10
Video Section - Peak White Clip
The modulator requires the following:
A composite video input with negative going sync pulses
A nominal level of 1Vp-p
This signal is AC-coupled to the video input where the sync tip level is clamped.
The video signal is then passed to a Peak White Clip circuit. The PWC circuit function is to soft-clip the
top of the video waveform if the “sync tip amplitude” to “peak white clip” goes too high. This method
avoids carrier over-modulation by the video. Clipping can be disabled by software.
N
F
8
---
4
128
×
=
N
2048
N
11
×
1024
N
10
×
……
4
N
2
×
2
N
1
×
N
0
+
+
+
+
+
=
LOP pin
Vcc
TV Out
Antenna
Input
F
Freescale Semiconductor, Inc.
n
.
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