mc44bc375 Freescale Semiconductor, Inc, mc44bc375 Datasheet - Page 3

• Manufacturer Part Number: mc44bc375
• Description: Pll Tuned Vhf Audio/ Video High Integration Modulator Ics
• Manufacturer: Freescale Semiconductor, Inc

TVOVCC
TVOUT
Power
save
Psave/
LOP
2 Device Overview
Figure 2 shows a simplified block diagram of the MC44BC375U/J/Tdevice.
The MC44BC375U/J/T device has two main sections:
The high frequency BICMOS technology permits integration of tank circuit and certain filtering functions.
MOTOROLA
Snd Freq
Select
- SFS
Channel
Select
CHS
PS1/2
Select
- PSS
1. A modulator section which accepts audio and video inputs and modulates the VHF carrier.
2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated
UHF oscillator, divided for VHF output)
-
14
16
13
1
2
9
GND
75Ω
12
LOP
3
Prescaler
Freescale Semiconductor, Inc.
/ 8
Modulator
Modulator
Figure 2. MC44BC375/U/J/T Block Diagram
For More Information On This Product,
Sound
Video
LPF
LPF
CHS
MC44BC375/U/J/T Technical Data
Test Mode
Go to: www.freescale.com
White Clip
Divider
Divider
OSC.
VHF
UHF
Peak
Divider
Prog.
31.25kHz
SFS
Divider
Sound
Prog.
PFD
Clamp
VIDEO
10
PLLFLT
Comp.
Phase
PLL
15
LPF
SPLLFLT
Modulator
Oscillator
31.25kHz
and FM
Sound
8
ALC
VCO & PLL
SECTION
Ref Divider
MODULATOR
/128
SECTION
Audio
Ampli
PSS
XTAL
4Mhz
XCO
Device Overview
4
11
7
6
5
AUDIO
PREEM
VCCA
GND
3