Freescale Semiconductor
Data Sheet
MC44C401L
Rev. 0.5, 07/2004
MC44C401L
MTS Stereo Encoder
The MC44C401L Multi-Channel Television Sound (MTS) Stereo
Encoder is the industry’s first, single-chip, CMOS implementation
of a Broadcast Television Systems Committee
(BTSC)-compatible stereo encoder.
The MC44C401L MTS Stereo Encoder is designed for use in
set-top boxes, VCRs, DVD players/recorders, game stations, and
other applications that are required to output high-quality stereo
sound through a single RF coaxial cable.
The digital audio processing used in the MC44C401L preserves
the full fidelity of surround sound and other audio coding schemes
while ensuring overall system performance is not impacted by
copy protection technologies.
The MC44C401L is engineered to process right and left analog
audio signals and baseband composite video to generate a
stereophonic composite signal in accordance with BTSC system
standards. The MC44C401L is designed to output this signal to a
Motorola RF modulator, which in turn produces a stereo encoded
RF channel for use with any BTSC stereo television receiver.
Contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Documentation . . . . . . . . . . . . . . . . . . . . . .
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . .
Package Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description . . . . . . . . . . . . . . . . . . . . . . . .
1.
2.
3.
4.
5.
6.
7.
1
2
2
4
5
7
9
1
•
•
•
Features
Integrated A/D input and D/A output circuitry
CEX
™ digital audio processing encodes and transports
stereo signals
Surround sound and Macrovision™ compatible
© Freescale Semiconductor, Inc., 2004. All rights reserved.
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Reference Documentation
•
•
•
•
•
•
Extended low frequency response (The MC44C401L frequency response extends below 25 Hz)
Simple passive interface to Motorola’s MC44BC374 (UHF/VHF) and MC44BC375 (VHF) modulators
Preservation of original surround sound fidelity
System performance not impacted by copy protection technologies
Enables lower system component count, smaller board size, and significantly lower overall system cost
Eliminates manual alignment of filters, phase controls, and composite signal amplitude
2
Reference Documentation
“Multichannel Television Sound Transmission and Audio Processing Requirements for the BTSC System”, FCC
OET Bulletin No. 60, February 1986.
3
Block Diagrams
MC44C401L
APLLVDD
XTALIN
XTALOUT
APLLVSS
ADCVDD
VINLP
VAGO
30
28
27
29
7
9
10
Oscillator
APLL
Clock
Generator
4MHz
22
CLK4MHZ
Σ∆
ADC
Σ∆
DAC
11
15
16
DACVDD
CA
DACVSS
VREFP
VAGO
VREFM
4
6
5
V-REF
VINRP
VAGO
ADCVSS
2
3
8
Σ∆
ADC
26
25
24
21
20
19
18
DVSS
OVDD
DVSS
DVDD
DVSS
DVSS
DVSS
CVBS
1
Sync
Separator
Audio
Processor
17
VID_PRES
SSVDD
SSVSS
31
32
Sync
Separator
Reference
Figure 1. MC44C401L Block Diagram
MTS Stereo Encoder, Rev. 0.5
2
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Freescale Semiconductor
Block Diagrams
0.1µF
0.1µF
V
IN
3.3V REG
22µH
1µF
3.3V
1K
47Ω
47Ω
1µF
510Ω
1µF
1µF
0.1µF
0.1µF
30
29
21
31
25
OVDD
APLLVDD
APLLVSS
1µF
LEFT IN
RIGHT IN
9
2
3
10
6
4
5
0.1µF
1
0.1µF
470pF
1M
ADCVDD
DACVDD
DVDD
SSVDD
11
17
560µH
1000pF
1µF
2200pF
7
1µF
1µF
0.1µF
1K
VINLP
VINRP
VAGO
VAGO
VAGO
VREFP
VREFM
VID_PRES
VID_PRES
to Modulator
Composite
Audio to
Modulator
4MHz to
Modulator
CVBS 15 500
MC44C401L
CLK4MHZ
XTALOUT
22
LPF or BPF
CVBS IN
CVBS
32
8
16
26
24
20
19
18
28
SSVSS
ADCVSS
DACVSS
DVSS
DVSS
DVSS
DVSS
DVSS
XTALIN
27
Analog Ground
Digital Ground
12MHz
22pF
2M
22pF
Figure 2. MC44C401L Recommended Usage
MTS Stereo Encoder, Rev. 0.5
Freescale Semiconductor
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
3
I/O Description
4
I/O Description
4.1 Signal List
The Stereo Modulator I/O signals are described in Table 1.
Table 1. MC44C401L Signal Descriptions
Signal
Analog
VINL
VREFP
VAGO
VREFM
VINR
CVBS
Digital
CA
VID_PRES
15
17
Composite Audio Output
Video present flag, 0 = no video, hi-z = video
present valid after 100 lines of valid video
No Connect
9
4
3,6,10
5
2
1
Left channel input voltage
ADC ref. input voltage
Analog virtual ground
ADC ref. input voltage
Right channel input voltage
Composite video input
Pin #
Description
NC
23,14,
13,12
Clocks
XTALIN
XTALOUT
CLK4MHZ
1
Power Supply
APLLVDD
APLLVSS
SSVDD
SSVSS
ADCVDD
ADCVSS
28
27
22
Crystal input
Crystal output
4 MHz clock for Audio/Video modulator IC
30
29
31
32
7
8
APLL analog supply voltage, 1.8 V
APLL analog ground
Sync Separator analog supply voltage, 3.3 V
Sync Separator analog ground
ADC analog supply voltage, 3.3 V
ADC analog ground
MTS Stereo Encoder, Rev. 0.5
4
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Freescale Semiconductor
Electrical Specifications
Table 1. MC44C401L Signal Descriptions (continued)
Signal
DACVDD
DACVSS
DVDD
DVSS
Pin #
11
16
21
18, 19,
20, 24,
26
25
Description
DAC I/O supply voltage, 3.3 V
DAC I/O ground
Digital Logic supply voltage, 1.8 V
Digital Logic/I/O ground
OVDD
1
I/O supply voltage, 3.3 V
Use a 4MHz LPF or BPF on this clock signal to the modulator
5
Electrical Specifications
5.1 DC Characteristics
Table 2. MC44C401L DC Characteristics (Preliminary)
PIN
DVDD
DVDD
OVDD
OVDD
DACVDD
DACVDD
ADCVDD
ADCVDD
SSVDD
SSVDD
APLLVDD
APLLVDD
VREFP
VREFM
VAGO
VINX
VINX
CVBS
Symbol
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
V
il
V
ih
Parameter
1.8 V Digital Logic
1.8 V Digital Logic
3.3 V Digital Output
3.3 V Digital Output
3.3 V DAC Supply
3.3 V DAC Supply
3.3 V ADC Supply
3.3 V ADC Supply
3.3 V Sync. Sep Supply
3.3 V Sync. Sep Supply
1.8 V APLL Supply
1.8 V APLL Supply
Voltage Ref. Bypass plus
Voltage Ref. Bypass minus
Voltage Ref. Ground
Signal Input
Signal Input
Video input (See Figure 2)
VREFM
VREFM
1
1.62
2.97
2.97
2.97
2.97
Min
1.62
Typ
1.80
18.0
3.30
2.0
3.30
7.0
3.30
7.0
3.3
2.0
1.8
3.0
2.0
1.0
1.5
VREFP
VREFP
1.98
Max
1.98
22.0
3.63
8.0
3.63
9.0
3.63
9.0
3.63
Unit
V
mA
V
mA
V
mA
V
mA
V
mA
V
mA
V
V
V
V
V
V
pp
MTS Stereo Encoder, Rev. 0.5
Freescale Semiconductor
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
5
能源基础设施
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