MC44BC374T1D [MOTOROLA]
PLL Tuned PAL/NTSC UHF and VHF Audio/ Video High Integration Modulator IC; PLL调谐PAL / NTSC超高频和甚高频音频/视频高集成调制器IC
| 型号： | MC44BC374T1D |
| 厂家： | 
MOTOROLA |
| 描述： | PLL Tuned PAL/NTSC UHF and VHF Audio/ Video High Integration Modulator IC |
| 文件： | 总27页 (文件大小：311K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Technical Data
MC44BC374T1/D
Rev. 1.2 07/2002
MC44BC374T1
MC44BC374T1
PLL Tuned PAL/NTSC
UHF and VHF Audio/
Video High Integration
Modulator IC
SO16NB Package
Ordering Information
Device
Temp Range
Package
MC44BC374T1D, R2
-20°C to +85°C
SO16NB
NOTE: For tape and reel, add R2 suffix.
Contents List
This modulator circuit is for use in VCRs, set-top boxes, and similar devices.
Figure 1 shows the pin connections.
1
2
3
4
5
6
Features . . . . . . . . . . . . . 1
Device Overview . . . . . . 3
Maximum Ratings . . . . . 4
Thermal Rating . . . . . . . 4
Electrostatic Discharge 4
Electrical Characteristics
5
7
8
9
I2C Bit Mapping . . . . . . . 5
I2C Programming . . . . . 6
Modulator High
Frequency
Characteristics
GNDD
SCL
SDA
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
8
VCCD
10 Video Characteristics . . 9
11 Audio Characteristics . 10
12 Characterization
Measurement
PLLFLT
STBY
XTAL
TVOVCC
TVOUT
GND
GND
Conditions
11
13 Modulator Operation . 16
14 High Speed I2C
PREEM
AUDIO
VCCA
Compatible Bus
19
VIDEO
15 Pin Circuit
Schematics
SPLFLT
22
16 Application and Case
Diagrams . . . . . . . . . . . 23
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
2
The channel is set by an on-chip high-speed I 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
2
•
•
•
•
•
High speed I 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)
2
Low-power modulator standby mode programmable by I 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:
2
1. A high speed I 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
VIDEO
9
SPLLFLT
8
MODULATOR
SECTION
Peak
White
Clip
2
Clamp
I C BUS
31.25
kHz
Video
Modulator
AUDIO
7
Sound
Oscillator
and FM
Audio
Amplifier
Sound
PFD
6
PREEM
TVOVCC
13
LPF
75Ω
Modulator
12
Prog
Divider
LPF
ALC
TVOUT
LPF
10 VCCA
FM
11
5
GND
GND
Sound
Modulator
BUS SECTION
VCO and PLL SECTION
VHF Dividers
UHF OSC
PLL
High Speed
SCL
SDA
1
2
2
I C Bus
Prescaler/8
Receiver
Prog
Divider
4MHz
XCO
Phase
Comp
Ref Divider
/128
2
I C BUS
31.25KHz
4
14
15
16
VCCD GNDD
PLLFLT
XTAL
Figure 2. MC44BC374T1 Simplified Block Diagram
MOTOROLA
MC44BC374T1 Technical Data
3
Maximum Ratings
3 Maximum Ratings
Sym
Parameter
Value Unit
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
Vcc
Supply voltage
6
V
o
Tamin Minimum operating ambient temperature
Tamax Maximum operating ambient temperature
Tstgmin Minimum storage temperature
–20
85
C
C
C
C
o
o
o
–65
150
150
Tstgmax Maximum storage temperature
Recommended Operating Conditions.
Tj
Junction Temperature
°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
Parameter
Value
Unit
R
Thermal resistance from Junction to Ambient
140
°C/W
thja
5 Electrostatic Discharge
Electrostatic Discharge (ESD) tests are done on all pins.
Sym
Parameter
Min
Typ
Unit
ESD
ESD
MM (Machine Model) - MIL STD 883C method 3015-7
200
500
V
V
HBM (Human Body Model) - MIL STD 883C method 3015-7
4000
6000
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
o
Unless otherwise stated: V =5.0V, Ambient Temperture=25 C, Video Input 1V , 10-step grayscale.
cc
p-p
RF output into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION.
Parameter
Min Typ Max Unit
Notes
Type
Operating supply voltage range
Total supply current
4.5
44
3
5.0
52
6
5.5
60
9
V
B
A
A
B
mA
mA
µS
All sections active
Bus Section active
Total standby mode supply current
Test pattern sync pulse width
3
4.7
6.5
Sound comparator charge pump current
During locking
7
0.7
10
1
12
1.5
µA
µA
A
A
When locked
RF comparator charge pump current
60
1
100
—
150
—
µA
A
D
Crystal oscillator stability—negative resistance
KΩ
STBY pin DC current
Force 5V to STBY pin
Force 0V to STBY pin
—
—
—
—
1
-10
µA
µA
A
A
2
7 I C Bit Mapping
WRITE MODE
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
CA—CHIP ADDRESS
C1—High Order Bits
C0—Low Order Bits
FM—High Order Bits
FL—Low Order Bits
1
1
1
0
0
0
0
1
0
1
0
ACK
ACK
ACK
ACK
ACK
SO
ATT
N11
N3
PS
X3
0
X2
X5
N7
X1
0
PWC
0
OSC
TPEN
N4
SFD1 SFD0
X4
N6
X0
N10
N2
N9
N1
N8
N0
N5
Bit Name
Description
PWC
OSC
ATT
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
SFD0, 1
SO
PS
Picture-to-sound carrier ratio
TPEN
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”)
X5…X0
N0…N11
UHF frequency programming bits, in steps of 250kHz
MOTOROLA
MC44BC374T1 Technical Data
5
I2C Programming
2
8 I C Programming
Sound
UHF
SFD1 SFD0
Sound Subcarrier Freq (MHz)
0
0
1
1
0
1
0
1
4.5
5.5
6.0
6.5
OSC
UHF Oscillator
Normal operation
1
0
UHF oscillator disabled (oscillator and PLL
sections bias turned OFF)
ATT
Modular Output Attenuation
PS
Picture-to-Sound Ratio (dB)
0
12
0
Normal operation
1
16
Modulator output attenuation (sound and
video modulators sections bias turned OFF.
1
SO
Sound Oscillator
0
Sound oscillator ON (Normal mode)
Video
1
Sound oscillation disabled (oscillator and PLL
PWC
0
Peak White Clip
Peak White Clip ON
Standby Mode
1
Peak White Clip OFF
OSC SO ATT
Combination of 3-bits
TPEN
0
Test Pattern Signal
Test pattern signal OFF (normal operation)
0
1
1
Modulator standby mode.
1
Test pattern signal ON (picture and sound)
WRITE MODE: Test Mode 1 and VHF Range
X2
X1
X0
State
Description
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1.a
1.b
1.c
1.d
1.e
1.f
Normal operation
RF frequency divided for low frequency testing or VHF range: RF/2
RF/4
RF/8
RF/16
DC drive applied to modulators: Non-inverted video at TVOUT
DC drive applied to modulators: Inverted video at TVOUT
1.g
Transient output inhibit disabled
1
1
1
1.h
During this speed-up test mode, ATT=0 forces sound current source to 1µA, and
ATT=1 forces it to 10µA.
6
MC44BC374T1 Technical Data
MOTOROLA
I2C Programming
WRITE MODE: Test Mode 2
X5
X4
X3
State
Description
0
0
0
0
0
1
2.a
2.b
Normal operation
Test pattern generator DC verification (Test pattern DC test mode available)
Programmable divider test
(UHF prog. div. on PLLFILT and sound prog. div. on SPLLFIL pin)
0
0
1
1
0
1
2.c
2.d
Reference divider test (UHF reference divider on PLLFILT pin)
UHF phase comparator, upper source on PLLFILT pin
Sound phase comparator 10µA upper source on SPLLFIL
(Only valid during transient output inhibit)
1
1
0
0
0
1
2.e
2.f
UHF phase comparator, lower source on PLLFILT pin
Sound phase comparator 10µA lower source on SPLLFIL
(Only valid during transient output inhibit)
Sound phase comparator 1µA upper source on SPLLFIL
1
1
1
1
0
1
2.g
2.h
(Not valid during transient output inhibit)
Sound phase comparator 1µA lower source on SPLLFIL
(Not valid during transient output inhibit)
NOTE:
Test modes 1 and 2 are intended for manufacturing test purpose only and
cannot be used for normal application, except for VHF range (states 1.b to
1.e)
MOTOROLA
MC44BC374T1 Technical Data
7
Modulator High Frequency Characteristics
9 Modulator High Frequency Characteristics
o
Unless otherwise stated: V =5.0V, Ambient Temperture=25 C, Video Input 1V , 10-step grayscale.
cc
p-p
RF inputs/outputs into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE
DEMODULATION.
Parameter
TVOUT output level
Test Conditions
Min Typ Max Unit Type
Output signal from modulator section
See Figure 3. See Note 2
73
74.5
77 dBµV
B
UHF oscillator frequency
VHF range
460
45
—
—
880 MHz
460 MHz
A
B
From UHF oscillator internally divided
During transient output inhibit, or when
ATT bit is set to 1. See Figure 3.
See Note 2
TVOUT output attenuation
50
60
—
dBc
B
Sound subcarrier harmonics (Fp+n∗Fs) Reference picture carrier. See Note 2
—
—
63
—
58
65
dBc
dBc
C
C
Second harmonic of chroma subcarrier Using red EBU bar. See Note 2
Chroma/Sound intermodulation:
Using red EBU bar.See Note 2
Fp+ (Fsnd – Fchr)
—
—
65
dBc
C
2nd harmonic: CH21
3rd harmonic: CH21
Other channels: See Figure 3.
—
—
35
26
30
22
Fo (picture carrier) harmonics
dBc
C
See NOTE 1. See Note 2
1/2∗Fo–1/4∗Fo–3/2∗Fo–3/4∗Fo
Out band (picture carrier) spurious
—
—
0
10 dBµV
60 dBc
C
C
From 40MHz to 1GHz. See Note 2
In band spurious (Fo 5MHz)
No video sound modulation.See Note 2
—
Note: 1: Picture carrier harmonics are highly dependant on PCB layout and decoupling capacitors.
Note: 2: See “Characterization Measurement Conditions” on page 11.
2Fo Harm onics
3Fo Harm onics
45
40
35
30
25
20
15
40
35
30
25
20
15
Typical
Typical
Minimum specification
Minimum specification
471 521 571 621 671 721 771 821 871
471 521 571 621 671 721 771 821 871
Frequency (M hz)
Frequency (M hz)
TV Output Level
TV Outpu t Atte n uatio n
78
75
70
65
60
55
50
45
77
76
75
74
73
72
Maximum specification
Typical
Typical
Minimum specification
Minimum specification
471 521 571 621 671 721 771 821 871
471 521 571 621 671 721 771 821 871
Fre qu e ncy (M hz )
Frequency (Mhz)
Figure 3. Typical Performance
MC44BC374T1 Technical Data
8
MOTOROLA
Video Characteristics
10 Video Characteristics
o
Unless otherwise stated: V =5.0V, Ambient Temperture=25 C, Video Input 1V , 10-step grayscale. RF
cc
p-p
inputs/outputs into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE
DEMODULATION.
Parameter
Video bandwidth
Test Conditions
Min
Typ
Max
Unit Type
Reference 0dB at 100kHz,
measured at 5MHz. See Note 2
–1.5
–0.8
—
dB
C
Video input level
75Ohm load
—
—
—
0.2
—
1.5
1
Vcvbs
µA
KΩ
D
A
A
Video input current
Video input impedance
500
—
PWC bit set to 1, see PWC section.
See Note 2
Peak White Clip
110
114
118
%
A
No sound modulation,100% white video
Using CCIR Rec.567 weighting filter
See Figure 4. See Note 2
Video S/N
50
45
–5
53
—
—
—
—
5
dB
C
C
C
Unweighted. See Note 2
CCIR Test Line 330, worst case from the
first 4 steps out of 5. See Note 2
Differential Phase
Differential Gain
deg
%
CCIR Test Line 310, worst case from the
first 4 steps out of 5. See Note 2
–5
—
5
C
6.8/
3.2
7.2/
2.8
Luma/Sync ratio
Input ratio 7.0:3.0
—
—
%
B
B
Video modulation depth
See Figure 4.See Note 2
75
81
88
PAL Video M odulation Depth
Video Signal to Noise
90
88
86
84
82
80
78
76
74
58
56
54
52
50
48
Maximum specification
Typical
Typical
Minimum specification
Minimum specification
471 521 571 621 671 721 771 821 871
471 521 571 621 671 721 771 821 871
Frequency (Mhz)
Frequency (M hz)
Figure 4. Typical performances
MOTOROLA
MC44BC374T1 Technical Data
9
Audio Characteristics
11 Audio Characteristics
o
Unless otherwise stated: V =5.0V, Ambient Temperture=25 C, Video Input 1V , 10-step grayscale.
cc
p-p
RF output into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION.
Parameter
Test Conditions
PS bit set to 0
Min
Typ
Max
Unit Type
13
9
16
12
19
15
Picture-to-Sound ratio
dB
%
B
PS bit set to 1
Using specific pre-emphasis circuit,
audio input level=205mVrms–audio frequency=1kHz
FM modulation: Fs=5.5, 6 or 6.5MHz
100% modulation= 50kHz FM deviation
Audio modulation depth
—
80
—
B
FM modulation: NTSC Fs=4.5MHz
100% modulation= 25kHz FM deviation
—
80
53
—
%
B
A
Audio input resistance
45
61
KΩ
Reference 0dB at 1kHz,
Audio Frequency response
using specified pre-emphasis circuit,
measure from 50Hz to 15kHz
–2.5
—
+2
dB
C
at 1kHz, 100% modulation ( 50kHz)
No video
Audio Distortion FM (THD only)
Audio S/N with Sync Buzz FM
—
0.4
53
2
%
C
C
See Figure 4
48
—
dB
Audio Signal to Noise
58
56
Typical
54
52
50
48
Minimum specification
46
471 521 571 621 671 721 771 821 871
Frequency (Mhz)
Figure 5. Typical performances
10
MC44BC374T1 Technical Data
MOTOROLA
Characterization Measurement Conditions
12 Characterization Measurement Conditions
Device default configuration unless otherwise specified:
•
•
•
•
•
•
•
•
•
Peak White Clip enable
UHF oscillator ON
Sound and video modulators ON
Sound subcarrier frequency = 5.5Mhz
Sound Oscillator ON
Picture-to-sound carrier ratio = 12dB
Test pattern disabled
All test mode bits are ‘0’
Frequency from channel 21 to 69
RF Inputs / Output into 75ohm Load using a 75 to 50 ohm transformation. Video Input 1V pk-pk. Audio
pre-emphasis circuit engaged.
Device and Signals Set-up
Measurement Set-up
TVOUT output level
Measured picture carrier in dBuV with the HP8596E Spectrum Analyzer
using a 75 to 50 ohm transformation, all cables losses and transformation
pads having been calibrated.
Video: 10 steps grey scale
No audio
Measurement used as a reference for other tests: TVout_Ref
TVOUT output attenuation
“ATT” bit = 1
No Video signal
No Audio signal
Measure in dBc picture carrier at “ATT”=”1” with reference to picture
carrier at “ATT”=”0”.
Sound Subcarrier Harmonics
Measure in dBc second and third sound harmonics levels in reference to
picture carrier (TVout_Ref).
Picture carrier
Sound carrier
Sound
2nd harm
Video: 10 steps grey scale
No Audio signal
Sound
3rd harm
Fo
+5.5Mhz +11Mhz +16.5Mhz
MOTOROLA
MC44BC374T1 Technical Data
11
Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
Second Harmonics of Chroma subcarrier
Measure in dBc, in reference to picture carrier (TVout_Ref), second
harmonic of chroma at channel frequency plus 2 times chroma
frequency, resulting in the following spectrum
No audio
Video: a 700mVpk-pk 100Khz sinusoidal
signal is inserted on the black level of
active video area.
Picture carrier
Sound
Chroma
carrier
carrier
Frequency
100Khz
Chroma 2nd
Harmonic
700mVpkpk
Fo
+4.43Mhz +5.5Mhz
+8.86Mhz
Chroma/Sound intermodulation
No audio signal
Measure in dBc, in reference to picture carrier (TVout_Ref),
intermodulation product at channel frequency plus the sound carrier
frequency (+5,5Mhz) minus the chroma frequency (-4,43Mhz), resulting
in the following spectrum.
Video: 700mVpk-pk 100Khz sinusoidal
signal inserted on the black level of
active video area.This is generated using
a Rohde & Schwarz Video Generator
SAF and inserting the required frequency
from a RF Signal generator.
Intermodulation product is at the channel frequency +1,07Mhz.
Picture carrier
Sound
Chroma
carrier
carrier
Frequency
4.43Mhz
700mVpkpk
Chroma/Sound
Intermod.
+1.07Mhz
+4.43Mhz +5.5Mhz
Fo
Picture Carrier Harmonics
Measure in dBc, in reference to picture carrier (TVout_Ref), second and
third harmonic of channel frequency, resulting in the following spectrum.
Picture carrier
3rd harmonic
2nd harmonic
No Video signal
No Audio signal
Fo
2Fo
3Fo
12
MC44BC374T1 Technical Data
MOTOROLA
Characterization Measurement Conditions
Measurement Set-up
Device and Signals Set-up
Out of Band Spurious
Measure in dBuV spurious levels at 0.25, 0.5, 0.75 and 1.5 times channel
frequency, resulting in the following spectrum
Measure from 40Mhz to 1Ghz.
Picture carrier
No Video signal
No Audio signal
Spurious
Fo/4
Fo/2 Fo*3/4
Fo
Fo*3/2
In Band Spurious
No Video signal
No Audio signal
Measure in dBc, in reference to picture carrier (TVout_Ref), spurious
levels falling into video bandwidth Fo+/-5Mhz.
Video Bandwidth
No audio
The Video signal is demodulated on the spectrum analyzer, and the peak
level of the 100Khz signal is measured as a reference. The frequency is
Video: 600mVpk-pk sinusoidal signal
inserted on the black level of active video then swept from 100Khz to 5Mhz, and then the difference in dBc from the
area.
100Khz reference level is measured.
Peak White Clip
The video modulation depth is measured for 1.0VCVBS input level,
giving modulation depth MDA. Then the same measurement is carried
out for an input level of 1.4VCVBC, giving modulation depth MDB.
The Peak White Clip is defined as 100*MDB/MDA.
No Audio signal.
Video: 10 step grey scale
Weighted Video Signal to Noise
Video: 100% White video signal - 1Vpk-
pk.
No Audio signal
The Video Analyzer measures the ratio between the amplitude of the
active area of the video signal (700mV) and the noise level in Vrms on a
video black level which is show below.
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with
sound trap and envelope detection, and
a Rohde & Schwarz UAF Video
Analyzer.
VideoS/N is calculated as 20 x log(700 /N) in dB
N
noise level in Vrms
Unweighted Video Signal to Noise
Same as above with CCIR filter disabled. Same as above.
Video Differential Phase
On line CCIR 330, the video analyzer DP measure consists of calculating
the difference of the Chroma phase at the black level and the different
chroma subcarrier phase angles at each step of the greyscale. The
largest positive or negative difference indicates the distortion.
Video: 5 step Grey Scale- 1Vpk-pk.
No Audio signal
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with
sound trap, and envelope detection, and
a Rohde & Schwarz UAF Video
Analyzer.
the largest positive or negative difference
DIFF PHASE =
* 100%
the phaseat position 0
The video analyzer method takes the worst step from the first 4 steps.
MOTOROLA
MC44BC374T1 Technical Data
13
Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
Video Differential Gain
On line CCIR 330 shown below, the video analyzer DG measure consists
of calculating the difference of the Chroma amplitude at the black level
and the different amplitudes at each step of the greyscale. The largest
positive or negative difference indicates the distortion.
Video: 5 step Grey Scale- 1Vpk-pk.
No Audio signal
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with
sound trap and envelope detection, and
a Rohde & Schwarz UAF Video
Analyzer.
3
5
1
0
2
4
5-step Greyscale with Chroma subcarrier superimposed
(not to scale), line CCIR 330.
the largest positive or negative difference
DIFF GAIN
=
* 100%
the amplitude at position 0
The video analyzer method takes the worst step from the first 4 steps.
Video Modulation Depth
This is measured using a HP8596E Spectrum Analyzer with a TV Trigger
option, allowing demodulation and triggering on any specified TV Line.
The analyzer is centred on the maximum peak of the Video signal and
reduced to zero Hertz span in Linear mode to demodulate the Video
carrier.
A(
m
V
)
No Audio signal
Video: 10 step grey scale
B(mV)
TV Line Demodulated by Spectrum Analyzer-BG standard
The Modulation Depth is calculated as (A-B)/A x 100 in%
Picture to Sound ratio
Measure in dBc sound carrier in reference to picture carrier (TVout_Ref)
for “PS” bit=0 (PS=12dB typical) and for “PS” bit=1 (PS=16dB),
Picture carrier
No Video signal
No Audio Signal
“PS” bit set to 0 and 1
Sound carrier
Fo
+5.5Mhz
Audio Modulation Depth - FM Modulation
The audio signal 205mV at 1kHz is supplied by the Audio Analyzer, and
the FM demodulated signal deviation is indicated on the Demodulator in
Khz peak.
This value is then converted in% of FM deviation, based on specified
standards.
Video Black Level
Audio signal: 1Khz, 205mVrms.
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A Audio Analyzer at 1kHz
14
MC44BC374T1 Technical Data
MOTOROLA
Characterization Measurement Conditions
Measurement Set-up
Device and Signals Set-up
Audio Frequency response
The audio signal 1KHz 100mV
is supplied by the Audio Analyzer,
rms
demodulated by the Demodulator and the audio analyzer measures the
AC amplitude of this demodulated audio signal: this value is taken as a
reference (0dB).
The audio signal is then swept from 50Hz to 15KHz, and demodulated
AC amplitude is measured in dB relative to the 1KHz reference.
Audio pre-emphasis and de-emphasis circuits are engaged, all audio
analyzer filters are switched OFF.
Video Black Level
Audio signal: 50Hz to 15KHz, 100mV
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A.
rms
Audio Distortion FM
The input rms detector of the Audio Analyzer converts the ac level of the
combined signal + noise + distortion to dc. It then removes the
fundamental signal (1kHz) after having measured the frequency. The
output rms detector converts the residual noise + distortion to dc. The dc
voltmeter measures both dc signals and calculates the ratio in% of the
two signals.
Audio: 1Khz, adjustable level
Video Black Level
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
and a HP8903A Audio Analyzer at 1kHz.
The output level of the Audio analyzer is
varied to obtain a deviation of 50kHz
indicated on the Demodulator.
ADist = (Distorsion + Noise) ⁄ (Distorsion + Noise + Signal)
Audio Signal to Noise
The Audio Analyzer alternately turns ON and OFF it's internal audio
source to make a measure of the Audio signal plus noise and then
another measure of only the noise.
Audio: 1Khz, adjustable level
The measurement is made using the internal CCIR468-2 Filter of the
Audio Analyzer together with the internal 30+/-2kHz (60dB/decade)
Lowpass filters.
The AMFS demodulator uses a quasi-parallel demodulation as is the
case in a normal TV set. In this mode the Nyquist filter is bypassed and
the video carrier is used without added delay to effectuate intercarrier
conversion. In this mode the phase noise information fully cancels out
and the true S/N can be measured
Video: EBU Color Bars
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A Audio Analyzer at 1kHz. The
output level of the Audio analyzer is
varied to obtain a Modulation Deviation
of 25kHz indicated on the AMFS
Demodulator.
ASN(dB) = 20 × log(Signal + Noise) ⁄ (Noise)
MOTOROLA
MC44BC374T1 Technical Data
15
Modulator Operation
13 Modulator Operation
13.1 Power ON Settings
At power-ON, the MC44BC374T1 configuration is as follows:
WRITE MODE
C1—High Order Bits
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
1
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
ACK
ACK
ACK
ACK
C0—Low Order Bits
FM—High Order Bits
FL—Low Order Bits
0
0
N11
N3
N10
N2
N9
N1
N8
N0
N7
0
N6
0
N5
N4
Note: N0 to N11 are set to have UHF oscillator on channel 71 (871.25MHz).
Note: Peak White Clip is ON.
Note: Sound frequency is 5.5MHz.
Note: Picture to sound ratio is 12dB.
NOTE:
This power-ON configuration is not available when modulator is switched
ON from STBY pin.
13.2 Power Supply
The three device Vccs (pins 10, 13, 15) must be applied at the same time to ensure all internal blocks are
correctly biased. All other pins must not be biased before Vcc is applied to device (except STBY pin
during hardware standby mode).
13.3 Standby modes
During standby mode, the modulator is switched to low power consumption: the sound oscillator, UHF
oscillator, video and sound modulator sections bias are internally turned OFF.
The IIC bus section remains active.
Modulator can be switched in standby mode in 2 cases:
•
•
Software standby mode: combination of 3 bits of IIC message:OSC=0, SO=1 and ATT=1
Hardware standby mode: STBY pin is set to LO state
Hardware / Software standby modes
There is an internal logical “OR” function between the hardware and software standby modes:
Hardware standby mode
Software standby mode
Modulator Mode
Normal
Normal
Normal
Normal
Standby
Standby
Standby
Normal
Standby
Standby
Standby
Standby
NOTE:
When switching from STBY=LO to STBY=HI, the modulator
configuration is not guaranteed. An IIC message has to be sent to program
the modulator.
16
MC44BC374T1 Technical Data
MOTOROLA
Modulator Operation
13.3.1 STBY Pin Levels
Modulator Mode
STBY pin state
Normal
Standby
HI
LO
+5V or
high impedance
STBY pin level
0V
A pull down resistor may be used on STBY pin in order to force an “high impedance” condition into a LO
state (i.e. standby mode condition).
13.4 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 for each of the following three cases:
•
•
•
Power-ON from zero (i.e., all Vcc is switched from 0V to 5V).
UHF oscillator power-ON from OFF state (i.e., OSC bit is switched from 0 to 1)
STBY pin switched from LO state to HI state
There is a time-out of 263ms until the output is enabled. This lets the UHF PLL settle to its programmed
frequency. During the 263ms time-out, the sound PLL current source is set to 10µA typical to speed up the
locking time. After the 263ms time-out, the current source is switched to 1µA. Use care when selecting
loop filter components, to ensure the loop transient does not exceed this delay.
For test purposes, it is possible to disable the 263ms delay using Test Mode1–State1.h.
13.5 Video Section — Peak White Clip
The modulator requires:
•
•
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.
13.6 Sound Section
The multivibrator oscillator is fully integrated and does not require any external components. An internal
low-pass filter and matched structure give a very low harmonics level.
The sound modulator system consists of an FM modulator incorporating the sound subcarrier oscillator
The audio input signal is AC-coupled into the amplifier, which then drives both types of modulator.
The audio pre-emphasis circuit is a high-pass filter with an external capacitor and an internal resistor
(100kOhms). The recommended capacitor value (470pF) is for BG standard; time constant is 50µs.
MOTOROLA
MC44BC374T1 Technical Data
17
Modulator Operation
13.7 Test Pattern Generator
The IC generates a simple test pattern, which can be switched under bus control to permit a TV receiver to
easily tune to the modulator output. The pattern consists of two white vertical bars on a black background
and a 976Hz audio test signal.
TE2
7/10
3/10
TE1
10
20 24 2830
40 44
50
60 64
0
TIME IN µS.
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:
F
8
128
4
--- --------
N =
×
with:
N = 2048 × N11 + 1024 × N10 + …… + 4 × N2 + 2 × N1 + N0
13.9 UHF Oscillator — VHF range
The UHF oscillator is fully integrated and does not require any external components.
For low frequency testing or VHF range operation (test mode 1, states 1.b to 1.c), the UHF oscillator can
be internally divided by: 2, 4, 8, or 16.
13.10 Differences From MC44BC374C device
•
•
•
•
•
•
“OSC” bit programming is inverted
Start up channel is ‘71’ instead od ‘36’
Hardware standby mode is added
Logic Output Port is not available
“TB1” bit is not available (limited software compatibility with the MC44355 device)
Read Mode is not available
18
MC44BC374T1 Technical Data
MOTOROLA
High Speed I2C Compatible Bus
2
14 High Speed I C Compatible Bus
14.1 Specification Conditions
o
Unless otherwise specified, Vcc1=5.0V, TA=25 C.
Electrical Characteristics
Min Typ
Max
Unit Type
SDA / SCL output current at 0V
SDA / SCL low input level
—
—
3.0
–5
0
—
—
—
—
—
—
0,3
—
10
1.5
—
µA
V
A
B
B
C
D
C
A
C
SDA / SCL high input level
V
SDA/SCL input current for input level from 0.4V to 0.3Vcc
SDA/SCL input level
5
µA
V
Vcc+0,3
10
SDA/SCL capacitance
—
—
—
pF
V
ACK low output level (sinking 3mA)
ACK low output level (sinking 15mA)
1
1.5
V
Timing Characteristics
Min Typ
Max
Unit Type
Bus clock frequency
0
—
—
—
—
—
—
—
—
—
—
—
800
—
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
C
C
C
C
C
C
C
C
C
C
C
Bus free time between stop and start
Setup time for start condition
Hold time for start condition
Data setup time
200
500
500
0
—
—
—
Data hold time
0
—
Setup time for stop condition
Hold time for stop condition
Acknowledge propagation delay
SDA fall time at 3ma sink I and 130pF load
SDA fall time at 3ma sink I and 400pF load
500
500
—
—
—
300
50
80
—
—
SDA rise time
SCL fall/rise time
—
—
—
—
300
300
ns
ns
C
C
Pulse width of spikes suppressed by the input filter
—
—
50
ns
C
14.2 Timings Definition
Tbuf
Stop
Start
ACK
Stop
SDA
SCL
Start
Chip Address
SSDA
SSCL
...
...
SDA
SCL
Tsu;sto Thd;sta
Tsu;dat Thd;dat
Tack:low
Tsu;sta
Thd;sto
14.3 Levels Definition
Vcc
Vih
dead band
SDA
...
Vil
0V
MOTOROLA
MC44BC374T1 Technical Data
19
High Speed I2C Compatible Bus
2
14.4 High Speed I C Compatible Bus Format
SCL
1
2
3
4
5
6
7
8
9
10 11 12 13 14
16 17
18 19
15
44 45
Stop
STA
Chip Address ($CA)
First Data Byte (C1 or FM)
Data
ACK
ACK
ACK
SDA
2
14.5 I C Write Mode Format and Bus Receiver
2
2
The bus receiver operates the I C compatible data format. The chip address (I C bus) is:
1 1 0 0 1 0 1 0 (ACK) = $CA (hex) in write mode
In write mode, each ninth data bit (bits 9, 18, 27, 36, and 45) is an acknowledge bit (ACK) during which
the MCU sends a logic 1 and the Modulator circuit answers on the data line by pulling it low. Besides the
chip address, the circuit needs two (2) or four (4) data bytes for operation. The following sequences of data
bytes are the permitted incoming information:
Example 1
Example 2
Example 3
Example 4
STA
STA
STA
STA
CA
CA
CA
CA
C1
FM
C1
FM
C0
FL
C0
FL
STO
STO
FM
FL
C0
STO
STO
C1
With:
STA = Start condition
CA = Chip Address
FM = Frequency information, high order bits
C1 = Control information, high order bits
STO = Stop condition
FL = Frequency information, low order bits
CO = Control information, low order bits
After the chip address, two or four data bytes may be received.
•
•
If three data bytes are received, the third one is ignored.
If five or more data bytes are received, the fifth and following ones are ignored, and the last ACK
pulse is sent at the end of the fourth data byte.
The first and third data bytes contain a function bit, which lets the IC distinguish between frequency
information and control information. If the function bit is a logic 1, the two following bytes contain control
information. The first data byte after the chip address, may be byte CO or byte FM. The two bytes of
frequency information are preceded by a logic 0.
20
MC44BC374T1 Technical Data
MOTOROLA
Pin Circuit Schematics
15 Pin Circuit Schematics
VCCD
VCC
VCCD
VCC
50
25K
SDA
25K
1/2 VCCD
SCL
1/2 VCCD
ACK
VCC
VCC
5K
STBY
XTAL
1.5K
VCC
VCC
50k
PREM
10k
audio
11.8k
AUDIO IN
VCC
VCC
TV OUT
VCC
5K
VCC
SPLLFLT
75
TVOVCC
VCC
VCC
VCC
100
PLLFLT
2K
VIDEO
500
10K
10K
Figure 6. Pin Schematics
MOTOROLA
MC44BC374T1 Technical Data
21
Application and Case Diagrams
16 Application and Case Diagrams
16.1 Proposed BiCMOS Modulator Application
This document contains information on a new product under development. Motorola reserves the right to change
or discontinue this product without notice.
Vcc
SDA SCL
O
O
O
2.2k
Note 2
22nF
16
Note 3
220K
1
SCL
GNDD
15
2
SDA
VCCD
3
14
Hi/Lo
STBY
PLLFLT
47nF
O TVOUT
Cx
Note 1
4
13
4MHz
XTAL
TVOVCC
10nF
5
12
GND
TVOUT
1nF
Pre-em
6
11
PREEM
GND
470pF
7
10
AUDIO
VCCA
8
9
10nF
SPLLFLT
VIDEO
220nF
10nF
100nF
15K
22nF
100nF
75
O
O
Vcc
O
Video
Audio
Note 1: Cx value depends on crystal characteristics; Cx = 27pF on Motorola application board.
Note 2: Loop Filter components must be as close as possible to pins 14 and 15
Note 3: The 220K pull down resistor set the STBY pin “open” condition to “standby mode”.
If not connected, the “open” condition is “normal mode”
Figure 7. Proposed MC44BC374T1 Application Schematic
22
MC44BC374T1 Technical Data
MOTOROLA
Application and Case Diagrams
16.2 Packaging Instructions
Tape and reel packaging per 12MRH00360A with the following conditions applicable for Dual In-Line
SOP (SOIC) package.
Component Orientation: Arrange parts with the pin 1
side closest to the tape's round sprocket holes on the
tape's trailing edge.
16.3 Marking Instructions
:
Bar marked part way accross Pin 1 end of package.
Bar width 10 to 20 mils, length to be at least four
times Bar width. Bar placement may extend across
M44BC374T1
chamfer and dimple areas.
Pin 1 Dot or Dimple
•
•
1st line:
44BC374T1 for MC44BC374T1 device
(Part number coded on 10 digits)
2nd line:
Assembly site code AW (2 digits) followed by the
wafer lot code L (1 digit),
year Y (1 digit) and
work week WW (2 digits)
MOTOROLA
MC44BC374T1 Technical Data
23
Application and Case Diagrams
Note: 1. Dimensions and Tolerances per ASME Y14.5M,
1994.
Millimeters
Dim
Inches
Min
Max
Min
Max
Note: 2. Controlling dimension: Millimeters.
Note: 3. Dimension D and E1 do not include mold
protrusion.
A
A1
D
E
1.35
0.1
1.75
0.25
10
0.054
0.004
0.385
0.229
0.150
0.014
0.008
0.068
0.009
0.393
0.244
0.157
0.019
0.009
Note: 4. Maximum mold protrusion 0.15 (0.006) per side.
9.8
Note: 5. Dimension b does not include Dambar
protrusion.
Allowable Dambar protrusion shall be 0.127 (0.005)
total in excess of the b dimension at maximum material
condition.
5.8
6.2
E1
b
3.8
4
0.35
0.19
0.49
0.25
c
e
1.27 BSC
0.050 BSC
L
0.4
1.25
0.5
0.016
0.010
0.049
0.019
h
0.25
o
o
o
o
Q
0
7
0
7
Figure 8. SO16NB Package
24
MC44BC374T1 Technical Data
MOTOROLA
Application and Case Diagrams
MOTOROLA
MC44BC374T1 Technical Data
25
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© Motorola, Inc. 2002
MC44BC374T1/D
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