MC44BC375T [MOTOROLA]
PLL Tuned VHF Audio/ Video High Integration Modulator ICs; PLL调谐VHF音频/视频高集成调制器芯片
| 型号： | MC44BC375T |
| 厂家： | 
MOTOROLA |
| 描述： | PLL Tuned VHF Audio/ Video High Integration Modulator ICs |
| 文件： | 总20页 (文件大小：532K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Freescale Semiconductor, Inc.
Technical Data
MC44BC375/D
Rev. 2.6 01/2003
MC44BC375/U/J/T
PLL Tuned VHF Audio/
Video High Integration
Modulator ICs
MC44BC375/U/J/T
SO16 Package
Ordering Information
Temp. Range
Device
Package
MC44BC375UD, R2
MC44BC375JD, R2
MC44BC375TD, 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. The device
differences are as follows:
1
2
3
4
5
6
Features . . . . . . . . . . . . . 2
Device Overview . . . . . . 3
Maximum Ratings . . . . . 4
Thermal Rating . . . . . . . 4
Electrostatic Discharge 4
Electrical
•
•
•
MC44BC375U VHF [CH3 & CH4] (Americas)
MC44BC375J VHF [CH1 & CH2] (Japan)
MC44BC375T VHF [CH13] (Taiwan)
Characteristics
5
7
8
Pin Selection . . . . . . . . . 6
High Frequency
Characteristics
(U Version)
6
9
Video Characteristics . . 7
10 Audio Characteristics . . 7
11 Characterization
Measurement
Conditions
12 Modulator
Functionality
13 Pin Circuit Schematics 14
SFS
CHS
PSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
7
PLLFLT
11
TVOVCC
LOP
14 MC44BC375U Application
Schematic
XTAL
TVOUT
GND
15
16
GND
15 Markings and Case
Diagrams
VCCA
PREEM
AUDIO
VIDEO
PSave/LO
SPLFLT
Figure 1. MC44BC375U/J/T 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.
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Features
1 Features
Channels are selectable using pin Channel Selection (CHS) and tuned by a PLL. They do not require any
external tank circuit components thus reducing the sensitivity of the PCB design and the need for external
adjustments. The PLL obtains its reference from a 4MHz crystal oscillator.
The sound subcarrier is also generated on-chip without external components. The 4.5MHz or 5.5MHz
Sound frequency is selectable using pin Sound Frequency Selection (SFS). The Picture to Sound subcarrier
ratio is also selectable by pin Picture to Sound selection (PSS) to either 14dB or 16dB. A Power Save
function is selectable via pin Psave/LO which turns off all internal VCOs and mixers and simultaneously
switches ON the Logic Output Port (LOP). No external Varicap Diodes/ Inductor nor other tuned
components are needed.
The MC44BC375/U/J/T also has the following features:
•
•
•
•
•
•
•
Channel selected by CHS pin
Integrated On-Chip Oscillator - No external tank circuit
Extremely Low External Components Count
Adjustable Video Modulation Depth (85% w/o adjustment)
Peak White Clip
Programmable Picture/Sound Carrier Ratio (14dB & 16dB) selected by PSS pin
Integrated On-chip Programmable Sound Subcarrier Oscillator (4.5 & 5.5MHz selected by SFS pin)
No external varicaps
•
•
•
•
•
Modulator Standby Mode selected by Psave/LO pin
Transient Output Inhibit During PLL Lock-up at Power-on
Logic Output Port selected by Psave/LO pin (Antenna Switch Driver)
Extremely Robust ESD protection, Minimum 4kV, typical 6kV.
Available in 80 dBuV RF output level (MC44BC375UA).
2
MC44BC375/U/J/T Technical Data
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MOTOROLA
Freescale Semiconductor, Inc.
2 Device Overview
Device Overview
Figure 2 shows a simplified block diagram of the MC44BC375U/J/Tdevice.
The MC44BC375U/J/T device has two main sections:
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)
The high frequency BICMOS technology permits integration of tank circuit and certain filtering functions.
VIDEO
SPLLFLT
LOP
10
8
3
MODULATOR
SECTION
Peak
White Clip
Clamp
AUDIO
TVOVCC
TVOUT
Video
7
6
14
Modulator
31.25kHz
Sound
Oscillator
and FM
Sound
PFD
Audio
Ampli
LPF
PREEM
75Ω
Modulator
13
Prog.
Divider
LPF
ALC
PSS
LPF
VCCA
GND
11
5
Power
save
Psave/
LOP
9
Sound
Modulator
SFS
Test Mode
Divider
Snd Freq
Select
- SFS
16
1
VHF
Divider
VCO & PLL
SECTION
Channel
Select
CHS
-
UHF
OSC.
PLL
PS1/2
Select
- PSS
31.25kHz
Prog.
Divider
Phase
Comp.
Prescaler
/ 8
4Mhz
XCO
Ref Divider
/128
2
CHS
4
XTAL
12
GND
15
PLLFLT
Figure 2. MC44BC375/U/J/T Block Diagram
MOTOROLA
MC44BC375/U/J/T Technical Data
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3
Freescale Semiconductor, Inc.
3 Maximum Ratings
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
MC44BC375/U/J/T Technical Data
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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: Vcc = 5.0V, T amb. = 25°C.Video input 1Vp-p, 10 step greyscale. RF inputs /
outputs into 75Ω load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION
Power Supply Parameters
Min Typ Max Unit
Notes
Type
Operating Supply Voltage range
Total Supply Current
4.5
40
3
5.0
47
5
5.5
55
7
V
B
A
A
mA All sections active
mA PSave/LO=LO
Total Standby Mode Supply Current
DC Parameter
Min Typ Max Unit
Type
Threshold voltage level on pins CHS, PSS, SFS, PSave/LO
2.1
10
1
V
C
A
A
A
D
7
0.7
60
1
12
µA
µA
µA
KΩ
Sound Comparator Charge Pump Current: During locking
When locked
1.5
RF Comparator Charge Pump Current
100 150
Crystal Oscillator Stability - negative resistance
-
-
Logic Output Port: Saturation voltage @ I=15mA
Leakage current
-
-
210 300
mV
uA
A
A
-
1
MOTOROLA
MC44BC375/U/J/T Technical Data
5
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Pin Selection
7 Pin Selection
Pin Nb Pin Name
Device
LO (grounded)
HI (Open or +5V)
MC44BC375U
MC44BC375J
MC44BC375T
CH4
CH2
CH13
CH3
CH1
CH13
1
CHS
2
PSS
MC44BC375U/J/T
MC44BC375U/J/T
MC44BC375U/J/T
14dB
16dB
Power save Mode
LOP pin LO (Low voltage)
Normal Operation
LOP pin HI (High impedance
9
PSave/LO
SFS
16
5.5Mhz
4.5Mhz
By default (open condition), all pins are “HI”.
7.1 Test Modes
Pin
DC level
Vcc + 0.3V
Description
Low frequency testing (RF frequency divided by 4 for MC44BC375U/J, and
divided by 8 for MC44BC375T)
CHS
Vcc + 1.1V
Vcc + 1Vbe
Vcc + 1Vbe
Base band test mode (DC drive applied to modulators)
PSS
SFS
Transient Output Inhibit Disabled
Sound Oscillator OFF
Vcc + 0.3V
Vcc + 1.1V
Force UHF and Sound PLL Upper current source
Force UHF and Sound PLL Lower current source
VIDEO
NOTE:
Test modes are intended for manufacturing test purpose only and not to be
be used for normal application.
8 High Frequency Characteristics (U Version)
For all the following specifications and unless otherwise stated: Vcc = 5.0V, T amb. = 25°C.Video input
1Vp-p, 10 step greyscale.RF inputs / outputs into 75Ω load.SPECIFICATIONS ONLY VALID FOR
ENVELOPE DEMODULATION. Measured on U version on both channel 3 and 4. See Section 11,
“Characterization Measurement Conditions” on page 7 for “C” type parameters.
Parameter
TV OUT output level
Test Conditions
Min Typ Max Unit Type
74
-
76
79 dBµV
B
C
C
C
Sound subcarrier Harmonics (fp+n*fs)
Second Harmonic of chroma subcarrier.
Ref Picture carrier
Using red EBU bar
-73
-65
-65
-65
-55
-60
dBc
dBc
dBc
-
Chroma/Sound intermodulation: fp + (fsnd-fchr) Using red EBU bar
-
2nd harmonic
Fo (picture carrier) Harmonics (See Note1)
3rd harmonic
30
66
42 dBµV
69 dBµV
C
C
Out Band (picture carrier) Spurious
In band spurious (Fo +/- 5 MHz range)
4 MHz Crystal Spurious (Fo +/- 4 MHz)
1/2*Fo - 1/4*Fo - 3/2*Fo - 3/4*Fo
27 dBµV
C
C
C
No video or sound modulation
No video or sound modulation
-70
-82
-62
-75
dBc
dBc
Note: 1: Picture carrier harmonics are highly dependant on PCB layout and decoupling capacitors.
6
MC44BC375/U/J/T Technical Data
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Freescale Semiconductor, Inc.
Video Characteristics
9 Video Characteristics
Parameter
Test Conditions
Min
Typ
Max
Unit Type
Reference 0dB at 100kHz, measured at
5MHz
Video bandwidth
-1.5
-0.5
—
dB
C
Video input level
75Ohm load
—
—
—
0.2
—
1.5
1
Vcvbs
µA
D
A
A
Video input current
Video input impedance
500
—
KΩ
Unweighted
Weighted
49
56
52
60
—
—
dB
dB
C
C
Video S/N
Differential Phase
Differential Gain
Luma/Sync ratio
+/-1
1
+/-5
5
deg
%
C
C
B
B
B
Input ratio 7.0:3.0
6.8/3.2
80
—
7.2/2.8
90
—
%
Video modulation depth Video input level=1.0 V
85
95
cbvs
Peak White Clip
Video Modulation Depth for Video=1.4 V
90.5
99.5
%
cbvs
10 Audio Characteristics
All audio measurement use specified pre-emphasis circuit.
Parameter
Test Conditions
Min Typ Max Unit Type
PSS (Pin2) = HI
PSS (Pin2) =LO
14
12
16
14
18
16
dB
dB
Picture to Sound ratio
B
B
Picture to Sound ratio
difference
between PSS = HI and PSS = LO
1.5
2.0
2.5
dB
Using specific pre-emphasis circuit - Audio Input: 1Khz @ 205 mVrms
Fs = 4.5 MHz
(100% Modulation = +/- 25 kHz FM Deviation)
Audio FM Modulation Depth
75
85
95
%
B
Fs = 5.5 MHz
(100% Modulation = +/- 50 kHz FM Deviation)
75
45
85
55
-
95
61
+2
%
kΩ
dB
B
A
C
Audio input resistance
0dB ref @1kHz
Measure from 50Hz to 15kHz
Audio Frequency response
-2.5
Audio Distortion FM (THD
only)
At 1 kHz and 100% mod (+/- 50 kHz) - No Video
-
0.3
53
1
-
%
C
C
Audio S/N with Sync Buzz FM
50
dB
11 Characterization Measurement Conditions
Device default configuration unless otherwise specified:
•
•
•
Sound subcarrier frequency = 5.5Mhz
Picture-to-sound carrier ratio = 12dB
CH3 & CH4 frequencies
RF Inputs / Output into 75ohm Load using a 75 to 50 ohm transformation.Video Input 1V pk-pk.Audio
pre-emphasis circuit engaged.
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Characterization Measurement Conditions
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
Sound Subcarrier Harmonics
Measure in dBc second and third sound harmonics levels in reference to
picture carrier (TVout_Ref).
Picture carrier
Sound carrier
Video: 10 steps grey scale
No Audio signal
Sound
2nd harm
Sound
3rd harm
Fo
+5.5Mhz +11Mhz +16.5Mhz
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
No audio
frequency, resulting in the following spectrum.
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
700mVpkpk
Chroma 2nd
Harmonic
Fo
+4.43Mhz +5.5Mhz
+8.86Mhz
Chroma/Sound intermodulation
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.
No audio signal
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
8
MC44BC375/U/J/T Technical Data
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Freescale SemiconCdhuarcacttoerriz,atIinoncM.easurement Conditions
Device and Signals Set-up
Measurement Set-up
Measure in dBc, in reference to picture carrier (TVout_Ref), second and
third harmonic of channel frequency, resulting in the following spectrum.
Picture carrier
No Video signal
No Audio signal
3rd harmonic
2nd harmonic
Fo
2Fo
3Fo
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 / 4Mhz Crystal Spurious
Measure in dBc, in reference to picture carrier (TVout_Ref), spurious
levels falling into video bandwidth Fo+/-5Mhz (15.125Khz & 31.25Khz
from reference dividers and 4Mhz from crystal).
No Video signal
No Audio signal
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.
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 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
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MC44BC375/U/J/T Technical Data
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Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
Video: 5 step Grey Scale- 1Vpk-pk.
No Audio signal
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.
the largest positive or negative difference
This is measured using a Rohde &
Schwarz AMFS 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.
DIFF PHASE =
* 100%
the phase at position 0
The video analyzer method takes the worst step from the first 4 steps.
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 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.
CCIR line 330 corresponds to FCC line 17 in NTSC/M standard
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
10
MC44BC375/U/J/T Technical Data
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Device and Signals Set-up
Measurement Set-up
Video Black Level
Audio signal: 1Khz, 205mVrms.
This is measured using a Rohde &
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.
Schwarz AMFS Demodulator in B/G and This value is then converted in% of FM deviation, based on specified
a HP8903A Audio Analyzer at 1kHz
standards.
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)
12 Modulator Functionality
12.1 Power Supply
The two device Vccs (pins 11 and 14) 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.
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Modulator Functionality
12.2 Test modes
The MC44BC375U/J/T test modes are enabled by any voltage level higher than Vcc on pins CHS, PSS,
SFS and VIDEO. Care must be taken in the application to not reach levels higher than Vcc on those pins.
12.3 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.
Modulator is programmed in standby mode when pin 9 PSave/LO is set to “LO” level (See PIN
SELECTION section).
12.4 Logic Output Port
The Logic Output Port is used to control an external switch (such as an antenna switch or an attenuator).
This pin is an open collector transistor able to drive up to 15mA at low voltage.
LOP level is switched between “HI” and “LO” level with pin 9 “Psave/LO” (See PIN SELECTION
section).
12.5 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 from zero (i.e. Vcc is
switched from 0V to 5V or device is switched from “Standby mode” to “Normal operation”).
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 (see TEST MODES section).
12.6 Video section
The modulator requires a composite video input with negative going sync pulses and a nominal level of
1Vp-p. This signal is AC coupled to the video input where the sync tip level is clamped.
Video modulation depth typical value is given for 1V
input level. It can be adjusted to any lower
CBVS
value by simply adding a resistive divider at video input, resulting in a lower signal seen by the video input
stage.
The video signal is then passed to a peak white clip circuit whose function is to soft clip the top of the
video waveform if the amplitude from the sync tip to peak white goes too high. In this way over-
modulation of the carrier by the video is avoided. The clipping function is always engaged.
12.7 Sound section
The multivibrator oscillator is fully integrated and does not require any external component. An internal
low pass filter and matched structure give 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 the modulator.
12
MC44BC375/U/J/T Technical Data
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Freescale Semiconductor, Inc.Modulator Functionality
The audio pre-emphasis circuit is a high-pass filter with an external capacitor C1 and an internal resistor
(100kOhms typical). The recommended capacitor value (750pF) is for M/N standards; time constant is
75µs. It is 470pF for B/G standards (50µs).
Audio bandwidth specification is for 50Hz to 15Khz range, with pre-emphasis circuit engaged. Without
this pre-emphasis circuit, it is possible to extend the audio bandwidth to the high frequencies as there is no
internal frequency limitation (stereo application).
12.8 PLL Section — Dividers
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 VHF divider is different for each of
the 3 versions.
The programmable divider’s division ratio is controlled by CHS pin voltage in order to get the following
VHF frequencies:
Device
Channel
VHF divider
CH3 = 61.25Mhz
CH4 = 67.25Mhz
CH1 = 91.25Mhz
CH2 = 97.25Mhz
MC44BC375U
8
MC44BC375J
MC44BC375T
6
3
CH13 = 211.25Mhz
12.9 Selectable Pins
Pins CHS, PSS, SFS are internally pulled up to 5V.
MOTOROLA
MC44BC375/U/J/T Technical Data
13
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Pin Circuit Schematics
13 Pin Circuit Schematics
VCC
100K
CHS
PSS
SFS
Psave
VCC
VCC
5K
LOP
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 3. Pin Schematics
14
MC44BC375/U/J/T Technical Data
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Freescale Semiconductor, Inc.
MC44BC375U Application Schematic
14 MC44BC375U Application Schematic
This document contains information
on a new product under development
Motorola reserves the right to change
or discontinue this product without notice
Loop Filter must
be as close as
CH 3/4
Select
O
PS1/2
Select
SFS
Select
O
O
47nF
22nF
10nF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
2.2k
LOP
Vcc
Cx***
O
TVOUT
4MHz
Pre-em
100nF
1nF
C1
Vcc
10nF
1nF 220nF
330nF
75*
Audio
O
O
Psave/LO
10k
R2**
R1**
22nF
Video
*: This 75Ω is to match with a 75Ω video signal applied thru coaxial cable.
It can be removed in case of high impedance video generator.
R1 and R2 are to reduce video modulation depth from typical value
(for example R1=1KΩ and R2=10KΩ reduce VMD by about 8%)
Cx is dependant on the crystal characteristics (Cx=27pF on Motorola application Board)
C1 value depends on standard: 470pF is for 50µs pre-emphasis time constant (B/G standard)
and 750pF is for 75µs (M/N standard).
Figure 4. MC44BC375U Application Schematic
MOTOROLA
MC44BC375/U/J/T Technical Data
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15
Freescale Semiconductor, Inc.
Markings and Case Diagrams
15 Markings and Case Diagrams
15.1 Pin Description
N°
Symbol
CHS
Pin description
Channel Select
Functionality
Channel 3 / Channel 4 selection for MC44BC375U
Channel 1 / Channel 2 selection for MC44BC375J
Don’t care for the MC44BC375T
1
2
3
PSS
LOP
Picture to Sound Select
Logic Output Port
PS=14dB / PS=16dB selection
Logic Output Level (Low voltage / high impedance)
selectable via Pin 9
4
5
6
7
8
XTAL
Crystal
Crystal Oscillator input
Gnd
Ground
PREEM
AUDIO
SPLFLT
Pre-emphasis
Audio Input
Sound PLL Filter
Audio Pre-emphasis capacitor
Normal Mode / Power save mode selection
In Power Save Mode, the LOP pin is automatically
switched to low voltage
9
PSave/LO
PowerSave & Logic Output control
10
11
12
13
14
15
16
VIDEO
VCCA
GND
Video Input
Voltage supply
Ground
TVOUT
TVOVCC
PLLFLT
SFS
TV Output
Modulated signal Output
Voltage supply
PLL Filter
UHF PLL Filter
Sound Frequency Select
Sound frequency 4.5Mhz / 5.5Mhz selection
16
MC44BC375/U/J/T Technical Data
MOTOROLA
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Markings and Case Diagrams
15.2 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.
15.3 Marking Instructions
In accordance with 12MRH00191A internal specification applied for Dual in-line SO package.
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
MC44BC375x
chamfer and dimple areas.
Pin 1 Dot or Dimple
•
•
1st line:
MC44BC375U for MC44BC375UD device
MC44BC375J for MC44BC375JD device
MC44BC375T for MC44BC375TD 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
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Freescale Semiconductor, Inc.
Markings and Case Diagrams
Millimeters
Inches
Note: 1. Dimensions and Tolerances per ASME
Y14.5M, 1994.
Dim
Min
Max
Min
Max
Note: 2. Controlling dimension: Millimeters.
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: 3. Dimension D and E1 do not include mold
protrusion.
9.8
Note: 4. Maximum mold protrusion 0.15 (0.006) per
side.
5.8
6.2
E1
b
3.8
4
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.
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 5. SO16NB Package
18
MC44BC375/U/J/T Technical Data
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MOTOROLA
Freescale Semiconductor, Inc.
Markings and Case Diagrams
MOTOROLA
MC44BC375/U/J/T Technical Data
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19
Freescale Semiconductor, Inc.
HOW TO REACH US:
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© Motorola, Inc. 2002
MC44BC375/D
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相关型号：
MC44BC375UAEF
SPECIALTY CONSUMER CIRCUIT, PDSO16, 1.27 MM PITCH, ROHS COMPLIANT, MS-012AC, SOIC-16
NXP
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