Technical Data
MC44BC374T1/D
Rev. 1.2 07/2002
MC44BC374T1
PLL Tuned PAL/NTSC
UHF and VHF Audio/
Video High Integration
Modulator IC
MC44BC374T1
SO16NB Package
Ordering Information
Device
MC44BC374T1D, R2
Temp Range
-20°C to +85°C
Package
SO16NB
NOTE: For tape and reel, add R2 suffix.
Contents List
1
2
3
4
5
6
Features . . . . . . . . . . . . . 1
Device Overview . . . . . . 3
Maximum Ratings . . . . . 4
Thermal Rating . . . . . . . 4
Electrostatic Discharge 4
Electrical Characteristics
5
7 I2C Bit Mapping . . . . . . . 5
8 I2C Programming . . . . . 6
9 Modulator High
Frequency
Characteristics
8
10 Video Characteristics . . 9
11 Audio Characteristics . 10
12 Characterization
Measurement
Conditions
11
13 Modulator Operation . 16
14 High Speed I2C
Compatible Bus
19
15 Pin Circuit
Schematics
22
16 Application and Case
Diagrams . . . . . . . . . . . 23
This modulator circuit is for use in VCRs, set-top boxes, and similar devices.
Figure 1 shows the pin connections.
SCL
SDA
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GNDD
VCCD
PLLFLT
TVOVCC
TVOUT
GND
VCCA
VIDEO
STBY
XTAL
GND
PREEM
AUDIO
SPLFLT
Figure 1. Pin Connection Diagram
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
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
selectable using the bus.
The modulation standard is set to System B/G.
The picture-to-sound ratio is adjusted using the bus. In addition, an on-chip video test pattern generator can
be turned ON with a 1KHz audio test signal.
Compared with the MC44BC374C, this modulator has one IIC programming difference, a hardware
standby mode in addition to the software standby mode, and no logic output port.
Compared with the MC44BC374T, this modulator has a different start-up channel.
The MC44BC374T1 also has the following features:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
No external varicaps diodes/inductor or tuned components
Channel 21-69 UHF operation
VHF range possible by internal dividers (30MHz–450MHz)
Integrated on-chip programmable UHF oscillator
Extremely low external components count
High speed I
2
C-bus compatible (800kHz)
Fixed video modulation depth (80%)
Peak White Clip disabled via 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 modulator standby mode programmable by I
2
C bus or
switchable by STBY pin voltage
Transient output inhibit during PLL Lock-up at power-ON
Start-up on channel ‘71’ (871.25 MHz)
Extremely robust ESD protection, minimum 4kV, typical 6kV
2
MC44BC374T1 Technical Data
MOTOROLA
Device Overview
2 Device Overview
Figure 2 shows a simplified block diagram of the MC44BC374T1device.
The MC44BC374T1 device has three main sections:
1. A high speed I
2
C-compatible bus section
2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated
UHF oscillator, divided for VHF output)
3. A modulator section, which accepts audio and video inputs, then uses them to modulates
the UHF/VHF carrier
An on-chip video test pattern generator with an audio test signal is included. The MC44BC374T1 is
designed to operate as a B/G standard modulator. High frequency BiCMOS technology allows integration
of the UHF tank circuit and certain filtering functions.
STBY
3
Peak
White
Clip
VIDEO
9
SPLLFLT
8
MODULATOR
SECTION
I
2
C BUS
Video
Modulator
TVOVCC
13
12
I
2
C BUS
TVOUT
I
2
C BUS
LPF
Clamp
31.25
kHz
Sound
PFD
Sound
Oscillator
and FM
Modulator
7 AUDIO
Audio
Amplifier
6
PREEM
75Ω
LPF
Prog
Divider
LPF
ALC
10 VCCA
FM
Sound
Modulator
11 GND
5
GND
BUS SECTION
I
2
C BUS
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
14
PLLFLT
4
XTAL
15
VCCD
16
GNDD
Figure 2. MC44BC374T1 Simplified Block Diagram
MOTOROLA
MC44BC374T1 Technical Data
3
Maximum Ratings
3 Maximum Ratings
Sym
Vcc
Tamin
Tamax
Supply voltage
Minimum operating ambient temperature
Maximum operating ambient temperature
Parameter
Value Unit
6
–20
85
–65
150
150
V
o
C
o
C
o
C
o
This device contains protection circuitry to guard
against damage due to high static voltage or electric
fields. However, precautions must be taken to avoid
applications of any voltage higher than maximum rated
voltages to this high impedance circuit. For proper
operation, input and output voltages should be
constrained to the ranges indicated in the
Recommended Operating Conditions.
Tstgmin Minimum storage temperature
Tstgmax Maximum storage temperature
Tj
Junction Temperature
C
°C
Maximum ratings are those values beyond which damage to the device may occur. For functional operation, values
should be restricted to the Recommended Operating Condition.
Meets Moisture Sensitivity Level 1, no dry pack required
4 Thermal Rating
Sym
R
thja
Parameter
Thermal resistance from Junction to Ambient
Value
140
Unit
°C/W
5 Electrostatic Discharge
Electrostatic Discharge (ESD) tests are done on all pins.
Sym
ESD
ESD
Parameter
MM (Machine Model) - MIL STD 883C method 3015-7
HBM (Human Body Model) - MIL STD 883C method 3015-7
Min
200
4000
Typ
500
6000
Unit
V
V
4
MC44BC374T1 Technical Data
MOTOROLA
Electrical Characteristics
6 Electrical Characteristics
•
•
•
•
A = 100% Tested
B = 100% Correlation tested
C = Characterized on samples
D = Design parameter
6.1 Specification Conditions
Unless otherwise stated: V
cc
=5.0V, Ambient Temperture=25
o
C, Video Input 1V
p-p
, 10-step grayscale.
RF output into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION.
Parameter
Operating supply voltage range
Total supply current
Total standby mode supply current
Test pattern sync pulse width
Sound comparator charge pump current
During locking
When locked
RF comparator charge pump current
Crystal oscillator stability—negative resistance
STBY pin DC current
Force 5V to STBY pin
Force 0V to STBY pin
Min
4.5
44
3
3
7
0.7
60
1
—
—
Typ
5.0
52
6
4.7
10
1
100
—
—
—
Max
5.5
60
9
6.5
12
1.5
150
—
1
-10
Unit
V
mA
mA
µS
µA
µA
µA
KΩ
µA
µA
All sections active
Bus Section active
Notes
Type
B
A
A
B
A
A
A
D
A
A
7 I
2
C Bit Mapping
WRITE MODE
CA—CHIP ADDRESS
C1—High Order Bits
C0—Low Order Bits
FM—High Order Bits
FL—Low Order Bits
Bit Name
PWC
OSC
ATT
SFD0, 1
SO
PS
TPEN
X5…X0
N0…N11
Peak White Clip enable/disable
UHF oscillator ON/OFF
Modulator output attenuated—sound and video modulators ON/OFF
Sound subcarrier frequency control bits
Sound Oscillator ON/OFF
Picture-to-sound carrier ratio
Test pattern enable—picture and sound
Test mode bits—All bits are 0 for normal operation (see Test Mode tables, page 6 & page 7)
except “OSC” bit (normal mode is “1”)
UHF frequency programming bits, in steps of 250kHz
Bit 7
1
1
PWC
0
N5
Bit 6
1
0
OSC
TPEN
N4
Bit 5
0
SO
ATT
N11
N3
Bit 4
0
0
SFD1
N10
N2
Description
Bit 3
1
PS
SFD0
N9
N1
Bit 2
0
X3
0
N8
N0
Bit 1
1
X2
X5
N7
X1
Bit 0
0
0
X4
N6
X0
ACK
ACK
ACK
ACK
ACK
ACK
MOTOROLA
MC44BC374T1 Technical Data
5
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