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FUNCTIONAL OVERVIEW
Figure 2 shows a simplified block diagram of the
2.
A modulator section which accepts audio and video
MC44CC375AV device.
There are two main sections:
1. A PLL section to synthesize the VHF output channel
frequency for channel 3 or channel 4.
inputs and modulates the VHF carrier.
The high frequency CMOS technology allows integration
of the UHF tank circuit and certain filtering functions eliminat-
ing the need for a number of external components.
VIDEO
8
SPLFLT
7
V CC
12
Peak
White
Clamp
MODULATOR
SECTION
Video
Modulator
31.25 kHz
Sound
6
AUDIO
Sound
PFD
Oscillator
and FM
Modulator
Audio
Amplifier
5
PREEM
RFOUT 11
Program
Divider
LPF
ALC
9
V CC
10 GND
FM
RF Sound
Modulator
15 AUX
SOC
3
VHF Dividers
VCO and PLL SECTION
Phase
Comp.
PSAVE 16
1
CHS
Control
Section
Prescaler ÷ 8
÷ 2
Program
Divider
÷ N11:N0
UHF OSC
(2 x F o )
Ref Divider
÷ 128
31.25 kHz
XO Prescaler
XCO
13
NO
CONNECT
2
GND
14
PLLFLT
4
XTAL
(4 MHz)
Figure 2. MC44CC375AV Simplified Block Diagram
POWER SUPPLY
Do NOT bias any other pin before V CC is applied to the de-
vice.
STANDBY MODES
During standby mode, the modulator is switched to low
power consumption. The sound oscillator, UHF oscillator and
VHF dividers, video and sound modulator sections bias are
internally turned OFF.
The modulator is programmed in standby mode when
pin 16, PSAVE, is set to a “LO” level
TRANSIENT OUTPUT INHIBIT
To minimize the risk of interference to other channels while
the UHF PLL is acquiring a lock on the desired frequency, the
Sound and Video modulators are turned OFF at power-ON
(i.e., V CC is switched from 0 V to 3.3 V).
There is a time-out of 263 ms until the output is enabled.
This allows the UHF PLL to settle to its programmed frequen-
cy. During the 263 ms time-out, the sound PLL current source
is set to 10 μ A typical to speed up the locking time. After the
263 ms time-out, the current source is switched to 1.0 μ A.
Use care when selecting loop filter components to ensure the
loop transient does not exceed this delay.
MC44CC375AV
Digital Home
Freescale Semiconductor
3
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