Technical Data
MC44BC373/D
Rev. 3.3, 5/2002
MC44BC373/3B/4/4B
Single or Dual Output
Multi-Standard or
PAL/NTSC Modulator
and Antenna
Booster/Splitter ICs
MC44BC373/3B/4/4B
SO24-WB Package
TSSOP 24 Package
Ordering Information
Device
Temp Range
Package
TSSOP24
TSSOP24
SO24-WB
SO24-WB
TSSOP24
TSSOP24
SO24-WB
SO24-WB
MC44BC373DTB,R2
MC44BC374DTB,R2
MC44BC373DW,R2
MC44BC374DW,R2
o
o
MC44BC373BDTB,R2 –10 C to +80 C
MC44BC374BDTB,R2
MC44BC373BDW,R2
MC44BC374BDW,R2
NOTE: For tape and reel, add R2 suffix.
Contents
Features . . . . . . . . . . . . . 2
Device Overview . . . . . . 3
Maximum Ratings . . . . . 6
Electrostatic Discharge 6
Electrical
Characteristics
6
2
6 I C Bit Mapping . . . . . . . 7
7 I
2
C Programming . . . . . 8
8 Modulator High
Frequency
Characteristics
10
9 Video Characteristics . 11
10 Audio Characteristics . 12
11 Antenna Booster/Splitter
Characteristics
13
12 Modulator Operation . 15
13 High-Speed I
2
C
Compatible Bus
19
14 Application and Case
Diagrams . . . . . . . . . . . 22
1
2
3
4
5
These modulator ICs are for use in VCRs, games, set-top boxes, and similar devices.
Figure 1 shows the pin connections.
SCL
SDA
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GNDD
VCCD
PLLFLT
TVOVCC
TVOUT/TVOUT1
GND
GND
VCRTU/TVOUT2
VCRVCC
VCCA
VIDEO
VCCI
LOP
XTAL
GND
ANT1
ANT2
GND
PREEM
AUDIO
SPLFLT
AUXIN
Single output version, Dual outputs version,
pin 20 is TVOUT
pin 20 is TVOUT1
pin 17 is VCRTU
pin 17 is TVOUT2
Figure 1. MC44BC373/3B/4/4B Pin Connections
This document contains information on a product under development. Motorola reserves the right to change or
discontinue this product without notice. © Motorola, Inc., 2002. All rights reserved.
Features
1 Features
MC44BC373: Multi-Standard PAL/SECAM/NTSC Single Output Modulator
MC44BC374: PAL/NTSC only Single Output Modulator
MC44BC373B: Multi-Standard PAL/SECAM/NTSC Dual Output Modulator
MC44BC374B: PAL/NTSC only Dual Output Modulator
The channel is set by an on-chip high-speed I
2
C compatible bus receiver. A Phase-Locked Loop (PLL) tunes
the modulator over the full UHF range. The modulator incorporates a sound subcarrier oscillator and uses
a second PLL to derive 4.5, 5.5, 6.0, and 6.5MHz subcarrier frequencies. These frequencies are selected
using the bus. The modulation standard is chosen using a control bit that selects either System L or System
B/G (MC44BC373/3B only).
The picture-to-sound ratio is adjusted using the bus. In addition, an on-chip video test pattern generator can
be switched ON using a 1kHz audio test signal.
Along with the modulator functions, an Antenna Booster/Splitter function is included
On dual output versions (MC44BC373B/4B), the modulated signal is added to the Antenna Booster/
Splitter outputs.
All four modulator versions are completely pin-to-pin and software compatible and all versions have the
following features.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
No external varicaps diodes/inductors or tuned components
Channel 21–69 UHF operation
VHF range possible by internal dividers (30MHz to 450MHz)
Integrated on-chip programmable UHF oscillator
Extremely low external component count
High-speed read and write I
2
C-bus compatible (800kHz)
Fixed video modulation depth (80% in PAL and 90% in SECAM)
Peak White Clip disabled using the bus
Programmable picture/sound carrier ratio (12dB and 16dB)
Integrated on-chip programmable sound subcarrier oscillator
(4.5MHz to 6.5MHz)—No external varicaps
On-chip video test pattern generator with sound test signal (1kHz)
Low-power programmable modulator standby mode
(booster active)
Transient output inhibit during PLL Lock-up at Power-ON
Logical Output Port controlled by bus
Integrated Antenna Booster/Splitter (40MHz to 860MHz)
Custom masked versions with unique start-up settings possible
(no I
2
C bus programming required)
Extremely robust ESD protection, minimum 4kV, typical 6kV
2
MC44BC373/3B/4/4B Technical Data
MOTOROLA
Device Overview
2 Device Overview
Figure 2 shows a simplified block diagram of the MC44BC373/4 device. Figure 3 shows a simplified
block diagram of the MC44BC373B/4B device.
The MC44BC373/3B/4/4B device contains four main sections:
1. A high-speed I
2
C-compatible bus section.
2. A PLL section — Synthesizes the UHF/VHF output channel frequency (from an integrated
UHF oscillator, divided for VHF output).
3. A modulator section — Accepts audio and video inputs and then uses those inputs to
modulate the UHF/VHF carrier.
4. An Antenna Booster/Splitter — Amplifies and splits the antenna signal into two signals:
a) On the MC44BC373/4 devices, the modulated signal is added to the amplified antenna
signal on the TVOUT pin.
b) On the MC44BC373B/4B devices, the modulated signal is added to both amplified
antenna signals on the TVOUT1 and TVOUT2 pins.
The following items are programmable using the high-speed I
2
C compatible bus:
•
•
•
Channel frequency
Sound frequency
Sound/picture carrier ratio
An on-chip video test pattern generator with an audio test signal is included.
The MC44BC373 operates as a multi-standard modulator and can handle the following systems using the
same external circuit components:
•
•
•
•
•
•
•
•
B/G
I
D/K
H
L
M/N
Antenna Booster/Splitter
UHF tank circuit and certain filtering
The high frequency BiCMOS technology permits integration of the following functions:
MOTOROLA
MC44BC373/3B/4/4B Technical Data
3
Device Overview
4
LOP
3
BST
SECTION
Peak
White
L/BG
75Ω
Video
Modulator
L/BG
VIDEO
14
SPLLFLT
11
MODULATOR
SECTION
GND 19
GND 18
Figure 2. Simplified Block Diagram—MC44BC373/4
I
2
C BUS
Clamp
31.25
kHz
Sound
PFD
Sound
Oscillator
and FM
Modulator
10 AUDIO
Audio
Amplifier
9
PREEM
TVOVCC 21
TVOUT 20
VCCI 13
16
VCRTU 17
GND
GND
ANT2
ANT1
5
LPF
75Ω
MC44BC373/3B/4/4B Technical Data
MOTOROLA
Prog
Divider
LPF
ALC
15 VCCA
I
2
C BUS
I
2
C BUS
LPF
4dB
8
6
7
BUS SECTION
I
2
C BUS
FM
Sound
Modulator
AM
L/BG
AM Modulator
12 AUX IN
VHF Dividers
UHF OSC
Prescaler/8
I
2
C BUS
PLL
VCO and PLL SECTION
SCL
1
SDA 2
High-Speed
I
2
C Bus
Receiver
Prog
Divider
Phase
Comp
Ref Divider
/128
4MHz
XCO
31.25kHz
22
PLLFLT
4
XTAL
23
VCCD
24
GNDD
MOTOROLA
LOP
3
BST
SECTION
Peak
White
L/BG
75Ω
Video
Modulator
L/BG
VIDEO
14
SPLLFLT
11
MODULATOR
SECTION
GND 19
GND 18
Figure 3. Simplified Block Diagram—MC44BC373B/4B
I
2
C BUS
Clamp
31.25
kHz
Sound
PFD
Sound
Oscillator
and FM
Modulator
10 AUDIO
Audio
Amplifier
9
PREEM
TVOVCC 21
TVOUT1 20
VCCI 13
16
TVOUT2 17
GND
GND
ANT2
ANT1
5
8
6
7
LPF
75Ω
MC44BC373/3B/4/4B Technical Data
5
Prog
Divider
LPF
ALC
15 VCCA
I
2
C BUS
I
2
C BUS
FM
LPF
4dB
Sound
Modulator
L/BG
AM Modulator
12 AUX IN
AM
BUS SECTION
I
2
C BUS
VHF Dividers
UHF OSC
Prescaler/8
I
2
C BUS
PLL
VCO & PLL SECTION
SCL
1
SDA 2
High-Speed
I
2
C Bus
Receiver
Prog
Divider
Phase
Comp
Ref Divider
/128
4MHz
XCO
Device Overview
31.25kHz
22
PLLFLT
4
XTAL
23
VCCD
24
GNDD
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