MOTOROLA MC44C401 Mts stereo encoder Datasheet

Freescale Semiconductor, Inc.
Technical Data
MC44C401
Rev. 1.1 02/2004
MC44C401
Freescale Semiconductor, Inc...
MC44C401
MTS Stereo Encoder
Ordering Information
Contents
1 Features . . . . . . . . . . . . . 1
2 Reference
Documentation
2
3 Block Diagrams . . . . . . . 3
4 I/O Description . . . . . . . 5
5 Electrical Specifications 6
6 Package Data . . . . . . . . 8
7 Functional Description 10
8 Calibration . . . . . . . . . . 11
Device
Temp. Range
Package
MC44C401FA
0°C to 70°C
32TQFP
The MC44C401 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 MC44C401 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 MC44C401 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 MC44C401 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 MC44C401 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.
1 Features
•
Integrated A/D input and D/A output circuitry
•
CEX™
•
Surround sound and Macrovision™ compatible
•
Extended low frequency response (The MC44C401 frequency response extends
below 25 Hz)
digital audio processing encodes and transports stereo signals
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Reference Documentation
•
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.
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•
2
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Block Diagrams
3 Block Diagrams
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MC44C401
PLLVDD
30
XTALIN
28
TALOUT
27 Osc
4 MHz
APLL
22 CLK4MHZ
Clock
Generator
APLLVSS
29
ADCVDD
7
VINLP
9
Σ∆
VINLM
10
ADC
VREFP
4
VAGO
6
VREFM
5
11 DACVDD
15 DOLPRP
Σ∆ DAC
14 DOLPRM
13 DOLMRP
Σ∆ DAC
V-REF
12 DOLMRM
16 DACVSS
26 DVSS
VINRP
2
Σ∆
25 OVDD
VINRM
3
ADC
24 DVSS
ADCVSS
8
21 DVDD
20 DVSS
19 DVSS
1
CVBS
18 DVSS
Sync
Separator
Audio Processor
SSVDD
31
SSVSS
32
23 NC
17 VID_PRES
Sync
Separator
Ref
Figure 1. MC44C401 Block Diagram
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Block Diagrams
0.1µF
0.1µF
0.1µF
0.1µF
Vin
3.3 V REG
22µH
1µF
1µF
3.3V
47Ω
47Ω
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1K
1µF
510Ω
11
DOLMRP 13
100K
560Ω
10
MC44C401
1µF
27 XTALOUT
28 XTALIN
19 DVSS
18 DVSS
24 DVSS
20 DVSS
DACVSS
DVSS
26
1M
470pF
CVBS
8 ADCVSS
0.1µF
16
V
1
NC 23
CLK4MHZ 22
SSVSS
CVBS
IN
Composite
To Modulator
1000pF
2200pF
DOLPRM 14
VREFM
32
5
0.1µF 0.1µF
VREFP
1µF
1.2K
DOLPRP 15
4
560µH
V
DOLMRM 12
VINLM
3
VINRM
6 VAGO
1K
VID_PRES To
Modulator
VID_PRES 17
VINRP
1µF
100K
DACVDD
OVDD 25
ADCVDD 7
29
31
SSVDD
VINLP
DVDD 21
V
2
V
IN
9
APLLVSS
1µF
LEFT
IN
RIGHT
APLLVDD 30
1µF
4MHz To
Modulator
12MHz
15pF
2M
15pF
Analog Ground
Digital Ground
Figure 2. MC44C401 Recommended Usage
4
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I/O Description
4 I/O Description
4.1 Signal List
The Stereo Modulator I/O signals are described in Table 1.
Table 1. MC44C401 Signal Descriptions
Signal
Pin #
Description
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Analog
VINLP
9
Left channel input voltage plus
VINLM
10
Left channel input voltage minus
VREFP
4
Left & Right ADC ref. input voltage plus
VAGO
6
Left & Right ADC analog virtual ground
VREFM
5
Left Right ADC ref. input voltage minus
VINRP
2
Right channel input voltage plus
VINRM
3
Right channel input voltage minus
CVBS
1
Composite video input
Digital
DOLPRP
15
Left+Right channel output voltage plus
DOLPRM
14
Left+Right channel output voltage minus
DOLMRP
13
Left-Right channel output voltage plus
DOLMRM
12
Left-Right channel output voltage minus
VID_PRES
17
Video present flag, 0 = no video, hi-z = video
present
NC
23
NC
Clocks
XTALIN
28
Crystal input
XTALOUT
27
Crystal output
CLK4MHZ
22
4 MHz clock for Audio/Video modulator IC
Power Supply
MOTOROLA
APLLVDD
30
APLL analog supply voltage, 1.8 V
APLLVSS
29
APLL analog ground
SSVDD
31
Sync Separator analog supply voltage, 3.3 V
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Electrical Specifications
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Table 1. MC44C401 Signal Descriptions (Continued)
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Signal
Pin #
Description
SSVSS
32
Sync Separator analog ground
ADCVDD
7
ADC analog supply voltage, 3.3 V
ADCVSS
8
ADC analog ground
DACVDD
11
DAC I/O supply voltage, 3.3 V
DACVSS
16
DAC I/O ground
DVDD
21
Digital Logic supply voltage, 1.8 V
DVSS
18, 19,
20, 24,
26
Digital Logic/I/O ground
OVDD
25
I/O supply voltage, 3.3 V
5 Electrical Specifications
5.1 DC Characteristics
Table 1. MC44C401 DC Characteristics (Preliminary)
PIN
6
Symbol
Parameter
Min
Typ
Max
Unit
DVDD
—
1.8 V Digital Logic
1.62
1.80
1.98
V
DVDD
—
1.8 V Digital Logic
—
18.0
22.0
mA
OVDD
—
3.3 V Digital Output
2.97
3.30
3.63
V
OVDD
—
3.3 V Digital Output
—
2.0
8.0
mA
DACVDD
—
3.3 V DAC Supply
2.97
3.30
3.63
V
DACVDD
—
3.3 V DAC Supply
7.0
9.0
mA
ADCVDD
—
3.3 V ADC Supply
2.97
3.30
3.63
V
ADCVDD
—
3.3 V ADC Supply
—
7.0
9.0
mA
SSVDD
—
3.3 V Sync. Sep Supply
2.97
3.3
3.63
V
SSVDD
—
3.3 V Sync. Sep Supply
—
2.0
—
mA
APLLVDD
—
1.8 V APLL Supply
1.62
1.8
1.98
V
APLLVDD
—
1.8 V APLL Supply
—
3.0
—
mA
VREFP
—
Voltage Ref. Bypass plus
—
2.0
—
V
VREFM
—
Voltage Ref. Bypass minus
—
1.0
—
V
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Freescale Semiconductor, Inc.Electrical Specifications
Table 1. MC44C401 DC Characteristics (Preliminary) (Continued)
PIN
Symbol
Min
Typ
Max
Unit
—
1.5
—
V
VAGO
—
Voltage Ref. Ground
VINXX
Vil
Signal Input
VREFM
VREFP
V
VINXX
Vih
Signal Input
VREFM
VREFP
V
CVBS
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Parameter
Video input (See Figure 2)
—
1
—
Vpp
CLK4MHZ
Vol
4 MHz Clock Output @ I =.6 mA
2.97
—
—
V
CLK4MHZ
Voh
4 MHz Clock Output @ I =.6 mA
—
—
3.63
V
DOLPRP
Vol a
Output Left-plus-Right plus
—
2.2
—
Vpp
DOLPRP
Voh b
Output Left-plus-Right plus
—
2.2
—
Vpp
Max
Unit
1.0
Vpp
a.
b.
Vol is measured at Iload= 6 mA (see test circuit Figure 2)
Voh is measured at Iload= 6 mA (see test circuit Figure 2)
5.2 AC Characteristics
Table 1. MC44C401 AC Characteristics (Preliminary) (See Figure 2)
SIGNALS
Parameter a
Symbol
Min
Typ
LEFT/RIGHT IN
—
Input Level
—
LEFT/RIGHT IN
—
Input Impedance
—
22
—
kΩ
COMPOSITE
—
Composite Output Level b
v
2.2
—
Vpp
COMPOSITE
—
Mono SNR c
65
75
—
dB
COMPOSITE
—
Stereo SNR c
55
65
—
dB
COMPOSITE
—
THD
0.1
0.3
%
COMPOSITE
—
-1 db Bandwidth
20
—
14000
Hz
CVBS IN
—
Video Level
0.5
—
2.0
Vpp
CVBS
Zin
Video Input Impedance
—
1000
v
Ω
—
—
Stereo Separation 500Hz–5KHz
25
35
—
dB
—
—
Stereo Separation 100Hz–10KHz
20
30
—
dB
a.
b.
c.
See Figure 2 for test setup
Test conditions 1 kHz 0 dB
Measured in 20 Hz to 13.5 kHz bandwidth
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Package Data
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6 Package Data
6.1 MC44C401 Package
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OVDD
DVSS
XTALOUT
XTALIN
APLLVSS
APLLVDD
SSVDD
SSVSS
The MC44C401 pin-outs (32TQFP package) are shown in Figure 3.
ORIENTATION
MARK
CVBS
DVSS
25
VINRP
NC
PIN 1
VINRM
CLK4MHZ
Motorola
MC44C401
VREFP
DVDD
VREFM
DVSS
VAGO
DVSS
ADCVDD
DVSS
17
9
ADCVSS
DACVSS
DOLPRP
DOLPRM
DOLMRP
DOLMRM
DACVDD
VINLM
VINLP
VID_PRES
Figure 3. MC44C401 32TQFP Package
8
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Package Data
6.2 Mechanical Data
1.
2.
3.
4.
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5.
6.
7.
8.
NOTES:
DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
CONTROLLING DIMENSION: MILLIMETER.
DATUM PLANE A, B AND D TO BE DETERMINED
AT DATUM PLANE H.
DIMENSIONS D AND E TO BE DETERMINED AT
SEATING PLANE C.
DIMENSIONS b DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL NOT CAUSE THE LEAD
WIDTH TO EXCEED THE MAXIMUM b DIMENSION
BY MORE THEN 0.08 MM. DAMBAR CANNOT BE
LOCATED ON THE LOWER RADIUS OR THE FOOT.
MINIMUM SPACE BETWEEN PROTRUSION AND
ADJACENT LEAD OR PROTURSION: 0.07 MM.
DIMENSIONS D1 AND E1 DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS 0.25
MM PER SIDE. D1 AND E1 ARE MAXIMUM PLASTIC
BODY SIZE DIMENSIONS INCLUDING MOLD
MISMATCH.
EXACT SHAPE OF EACH CORNER IS OPTIONAL.
THESE DIMENSIONS APPLY TO THE FLAT
SECTION OF THE LEAD BETWEEN 0.1 MM AND 0.25
MM FROM THE LEAD TIP.
DIM
A
A1
A2
b
b1
c
c1
D
D1
e
E
E1
L
L1
O
O1
R1
R2
S
MILLIMETERS
MIN
MAX
1.40
1.60
0.15
0.05
1.45
1.35
0.45
0.30
0.30
0.40
0.09
0.20
0.09
0.16
9.00 BSC
7.00 BSC
0.80 BSC
9.00 BSC
7.00 BSC
0.50
0.70
1.00 REF
×
0
7×
12 × REF
0.08
0.20
0.08
—
0.20 REF
Figure 4. Package Mechanical Information
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Functional Description
7 Functional Description
The following sections provide brief descriptions of the MC44C401 modules.
7.1 Phase Locked Loop (APLL)
The APLL locks to the reference frequency of 12 MHz and generates the master clock.
MC44C401
384 MHz
APLL
VCO
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Ref Clk
Clock
Generator
÷
Oscillator
XTALIN
XTALOUT
12MHz
2M
15pF
15pF
Figure 5. APLL and Clock Generator
7.2 Sync Separator
The Sync Separator, shown in Figure 6, extracts the composite sync from the incoming composite
video signal.
The composite sync is used by the Audio Processor to generate the 15.734 kHz pilot tone and the
31.468 kHz carrier to modulate the Left-Right channel. The nominal output level of composite
video signal sources is 1 Vpp on 75 Ω and the sync amplitude is 0.3 V.
MC44C401
CVBS IN
CVBS
Sync Separator
1K
470pF
0.1µF
1M
Audio
Processor
Figure 6. Sync Separator
10
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Calibration
8 Calibration
The following sections show methods for setting various output levels for optimum system performance.
8.1 Modulator Sensitivity
Composite Video
Audio Precision SYS2
Left In
Audio Generator
Stereo Encoder
Right In
DOLPRP
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Audio Spectrum
Analyzer
470
1.2K
Audio Analyzer
DOLMRP
500
LPF
Disconnect Stereo
Encoder,
Inject 10395Hz here,
Adjust level for Bessel
null on spectrum
Analyzer
Measure Bessel
Null Here
Modulator
Measure Level With
Audio Spectrum
Analyzer Here
Spectrum Analyzer
Precision Receiver
TEK TV1350
Precision MTS Decoder
Wide Band
Output
Modulation Sciences SRD1
Cross Check that
Deviation Meter reads
25KHz Deviation
Measure Modulator Sensitivity
Figure 7. Measuring Modulator Sensitivity
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Calibration
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8.2 Setting Output Levels
Inject 300Hz
995Mv signal on
Both Channels
Composite Video
Audio Precision SYS2
Stereo Encoder
Left In
Audio Generator
Right In
Audio Spectrum
Analyzer
DOLPRP
470
1.2K
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Audio Analyzer
DOLMRP
500
Measure 300Hz Level on
Spectrum with Both
Channels Driven, Must
Equal level measured from
Bessel null Calibration
LPF
Adjust to Achieve
same level as 25
KHz deviation
calibration as
measured on
Audio Spectrum
Modulator
Spectrum Analyzer
Precision Receiver
TEK TV1350
Precision MTS Decoder
This will indicate more
than 25KHz deviation
due to Pilot adding to
total signal
Wide Band
Output
Modulation Sciences SRD1
Set Output Level
Figure 8. Setting Output Levels
12
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Calibration
8.3 Setting Sum/Difference Channels
Inject 1000Hz 995Mv
signal on One Channel
Composite Video
Audio Precision SYS2
Left In
Audio Generator
Stereo Encoder
Right In
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Audio Spectrum
Analyzer
DOLPRP
470
1.2K
Audio Analyzer
DOLMRP
500
LPF
Adjust to
Optimize stereo
Separation
measured on
audio analyzer
Modulator
Spectrum Analyzer
Precision Receiver
TEK TV1350
Precision MTS Decoder
Wide Band
Output
Modulation Sciences SRD1
This will indicate more
than 35KHz deviation due
to Pilot and Difference
signals adding to total
Set Sum/Difference Channel Balance
Figure 9. Setting Sum/Difference Channel Balance
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Calibration
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Calibration
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