M21204/M21214
SD and HD Cable Equalizers
Rev V2
Applications
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
SMPTE Coaxial Cable Interface
Studio video applications
Broadcast video applications
Distribution video applications
Standards Compliance
• SMPTE 259M, SMPTE 292M, SMPTE 344M
(at appropriate data rates)
• DVB-ASI (270 Mbps)
SMPTE/DVB-ASI compliant at SD and HD (M21214)
SMPTE/DVB-ASI compliant at SD (M21204)
Pin for Pin and functionally compatible with GS1524 (M21214)
Pin for Pin and functionally compatible with GS9064 (M21204)
Interchangeable PCB footprint for all three devices
2.5V or 3.3V Supply
Low Power (175 mW @ 2.5V, 230 mW @ 3.3V)
25 dB typical input return loss with existing matching circuit
Extended Temperature range: –10 to 85 °C
The M21204/M21214 are high-speed, low-power, adaptive co-axial cable equalizers designed to increase the
maximum low-jitter transmission distance of serial digital interface (SDI) video signals and DVB-ASI across
commonly used bandwidth-limiting 75Ω coaxial cable. These devices automatically optimize their transfer function
based on the bit rate and cable length to minimize the inter-symbol interference (ISI) jitter caused by the cable and
to remove the DC offset components introduced with the pathological test pattern and AC coupling in systems.
The M21214 is designed to support at SD and HD data rates from 143 Mbps and 1485 Mbps. The M21204 is
designed to support SD data rates between 143 Mbps and 540 Mbps. The low-noise, high-gain equalizer allows for
low jitter HD transmissions up to a length of 200m (Belden 1694A) and 120m (Belden 8281). For SD data rates,
cable lengths up to 400m (Belden 1694A) and 300m (Belden 8281) are supported.
The M21214 is designed to be a pin-for-pin compatible drop-in replacement for the legacy GS1524, while the
M21204 is a pin-for-pin compatible drop-in replacement for the legacy GS9064. These devices offer lower power
dissipation, a choice of a 2.5V or 3.3V power supply, for new designs, and increased typical input return loss of 25
dB, depending on installed input BNC connector.
Functional Block Diagram
EQ_BYP
SDI
SDI
1
INPUT
BUFFER
SDO
EQUALIZER
CORE
DC
RESTORE
OUTPUT
BUFFER
SDO
0
CABLE
LENGTH
INDICATOR
M21204/M21214
Cable Equalizer
AGC
AGC
CLEN
MUTE
CONTROL
THRESH
SD/MUTE
1
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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http://www.macom.com/support
M21204/M21214
SD and HD Cable Equalizers
Rev V2
Ordering Information
Part Number
Package
Operating Data Rate
Operating Temperature
M21204G-xx*
16-pin SOIC (RoHS compliant)
143–540 Mbps
–10 °C to 85 °C
M21214G-xx*
16-pin SOIC (RoHS compliant)
143–1485 Mbps
–10 °C to 85 °C
* Consult the price list for exact part number when ordering.
* The letter ‘G’ designator after the part number indicates a RoHS-compliant package.
Revision History
Revision
Level
Date
Description
V2
Release
May 2015
Updated logos and page layout. No content changes.
B (V1)
Release
April 2007
Production release.
Specification changes to Tables 1-3, 1-5, and 1-6.
A
Preliminary
February 2007
Combined M21204 and M21214 Data Sheets.
(replaces 21204-DSH-001-C and 21214-DSH-001-F).
Removed 1.8V operation.
Removed CLI and MUTE threshold specification.
2
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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For further information and support please visit:
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.0
Product Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.2
Input/Output Level Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.3
EQ Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
1.4
Package Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
1.5
Manufactureability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.6
1.5.1
Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.5.2
Peak Reflow Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.5.3
Moisture Sensitivity Level (MSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Design Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.6.1
2.0
Thermal Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.2
2.1.1
General Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1.2
High-Speed Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1.3
High-Speed Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1.4
Adaptive Equalization Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1.5
Cable Length Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1.6
Output Mute and Signal Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1.7
Equalizer Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
M21204/M21214 Common Signals by Interface Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.2.1
M21204/M21214 Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
A.1
Glossary of Terms/Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
A.2
Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
A.2.1
External . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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For further information and support please visit:
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
List of Figures
Figure 1-1.
Output Symbols Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 1-2.
M21204/M21214 Packaging Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 2-1.
Single-ended Typical Input Matching/Termination Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 2-2.
Test Setup Diagram for M21204/M21214 Cable Equalizer Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 2-3.
M21204/M21214 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4
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Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
List of Tables
Table 1-1.
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 1-2.
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 1-3.
Power DC Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 1-4.
CMOS Input Electrical Specifications (Logic Signals Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 1-5.
High Speed Input Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 1-6.
High Speed Output Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 1-7.
Cable Equalizer Distance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 1-8.
SD/MUTE Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 2-1.
Power Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 2-2.
High-speed Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 2-3.
M21204/M21214 Control/Interface Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5
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For further information and support please visit:
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
1.0 Product Specification
1.1
General Specifications
Table 1-1.
Absolute Maximum Ratings
Symbol
Minimum
Maximum
Units
Digital I/O Power
AVSS – 0.5
AVSS + 3.6
V
—
High-speed signal pins
AVSS – 0.5
AVSS + 3.6
V
—
Control/Interface Pins
AVSS – 0.5
AVSS + 3.6
V
TSTORE
Storage Temperature
–65
+150
°C
ESDHBML
Human Body Model (low-speed)
2000
—
V
ESDHBMH
Human Body Model (high-speed)
2000
—
V
ESDCDM
Charge Device Model
500
—
V
AVDD
Parameter
NOTE:
No Damage.
Table 1-2.
Recommended Operating Conditions
Symbol
Notes
Minimum
Typical
Maximum
Units
Power
1
–5%
2.5/3.3
+5%
V
TA
Ambient Temperature
—
–10
—
+85
°C
θJA
Junction to Ambient Thermal Resistance
—
—
90
—
°C/W
AVDD
Parameter
NOTES:
1.
Mounted on multi layer board (≥ 4 layers).
2.
Airflow = 0.0 m/s.
6
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M21204/M21214
SD and HD Cable Equalizers
Table 1-3.
Rev V2
Power DC Electrical Specifications
Symbol
Parameter
Notes
Minimum
Typical
Maximum
Units
1
—
70
90
mA
Total IDD
Supply Current
PDISS2.5V
Total Power Dissipation (@2.5V)
1, 2, 3
—
175
236
mW
PDISS3.3V
Total Power Dissipation (@3.3V)
1, 2, 3
—
230
312
mW
NOTES:
1.
Specified at recommended operating conditions—see Table 1-2.
2.
Includes on-chip power dissipation as well as off-chip power dissipated by termination resistors.
3.
Typical calculated at nominal supply voltage, maximum calculated at nominal supply voltage + 5%.
1.2
Input/Output Level Specifications
Table 1-4.
CMOS Input Electrical Specifications (Logic Signals Only)
Symbol
Parameter
Notes
Minimum
Typical
Maximum
Units
VIH
Input Logic High Voltage
1
0.75 x AVDD
—
AVDD + 0.3
V
VIL
Input Logic Low Voltage
1
0
—
0.25 x AVDD
V
IIH
Input Current (logic high)
1
–100
—
100
μA
IIL
Input Current (logic low)
1
–100
—
100
μA
NOTE:
1.
Specified at recommended operating conditions—see Table 1-2. Spec is for a max load of 20 pF.
7
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M21204/M21214
SD and HD Cable Equalizers
Table 1-5.
High Speed Input Electrical Specifications
Symbol
DRIN
Rev V2
Parameter
Notes
Minimum
Typical
Maximum
Units
Input Bit Rate (M21204)
1
143
—
540
Mbps
Input Bit Rate (M21214)
1
143
—
1485
Mbps
VID
Input Voltage Range with 0m of cable, p-p,
AVDD = 2.5 or 3.3V
1, 5
700
800
1200
mV
VICM
Input Common-Mode Voltage (AVDD = 3.3V)
1, 4
—
2.75
—
V
Input Common-Mode Voltage (AVDD = 2.5V)
1, 4
—
1.95
—
V
CIN
Input capacitance
1, 4
—
0.5
—
pF
RIN
Input resistance
1, 4
—
1.6
—
kΩ
S11
Input Return Loss (5 MHz to 1.5 GHz)
1, 2, 3
20
30
—
dB
NOTES:
1.
Specified at recommended operation conditions—see Table 1-2.
2.
Using the recommended input termination shown in Figure 2-1.
3.
Measured single ended.
4.
Guaranteed by design.
5.
This is also the recommended cable launch level (far end).
8
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M21204/M21214
SD and HD Cable Equalizers
Table 1-6.
High Speed Output Electrical Specifications
Symbol
tr/tf
tr/tfmm
DCDO
Parameter
Notes
Minimum
Typical
Maximum
Units
Rise/Fall Time (20%–80%), M21204
1, 2, 7
—
500
675
ps
Rise/Fall Time (20%–80%), M21214
1, 2, 7
—
100
120
ps
Rise/Fall Time Mismatch, M21204
1, 2, 7
—
0
70
ps
Rise/Fall Time Mismatch, M21214
1, 2, 7
—
0
30
ps
Duty Cycle Distortion (DCD), M21204
1, 2, 5, 6
—
0
50
ps
Duty Cycle Distortion (DCD), M21214
1, 2, 5, 6
—
0
15
ps
1, 3
600
750
950
mV
1, 3, 4
—
AVDD – 0.205
—
V
1, 3
850
1050
1270
mV
1, 3, 4
—
AVDD – 0.290
—
V
1
40
50
60
Ω
VOD
Differential Output Voltage p-p
HiSwEn = 0 (750mV)
VOCM
Common mode Voltage
HiSwEn = 0 (750mV)
VOD
Differential Output Voltage p-p
HiSwEn = 1 (1050mV)
VOCM
Common mode Voltage
HiSwEn = 1 (1050mV)
ZO
Rev V2
Internal Output Termination Resistance to AVDD
NOTES:
1.
Specified at recommended operation conditions—see Table 1-2.
2.
With 100Ω differential termination.
3.
With 50Ω to AVDD termination.
4.
Outputs DC-coupled.
5.
Duty Cycle Distortion (DCD) is defined as the difference in the intrinsic jitter at the 50% voltage level and the intrinsic jitter at the rising/falling edge crossing
point. If the rising/falling edge crossing point is at the 50% voltage level, then DCD = 0.
6.
Measured with a 1010 pattern.
7.
Measured with a PRBS23 pattern.
9
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M21204/M21214
SD and HD Cable Equalizers
Figure 1-1.
Rev V2
Output Symbols Definition
tr
tf
VOH
JOPP
VOD VOCM
VOL
VOH: Average voltage high level
VOL: Average voltage low level
VOD: (VOH) – (VOL)
VOCM: Common Mode Voltage
JOPP: Output Jitter Peak-Peak
tr: 20-80% Rise Time
tf: 80-20% Fall Time
NOTE: Waveform above is differential.
10
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M21204/M21214
SD and HD Cable Equalizers
1.3
Rev V2
EQ Specifications
Table 1-7.
Cable Equalizer Distance Specifications
Symbol
Parameter
LENSD
Max Cable Length
LENHD
Conditions
Notes
Minimum
Typical
Maximum
Units
Belden 1694A
1, 3
—
400
—
m
Max Cable Length
Belden 8281
1, 3
—
300
—
m
Max Cable Length
Belden 1694A
2, 5
—
200
—
m
Max Cable Length
Belden1694A
2, 4
—
140
—
m
Max Cable Length
Belden 8281
2, 4
—
120
—
m
Notes
Minimum
Typical
Maximum
Units
NOTES:
Entire table specified at recommended operating conditions—see Table 1-2.
1. Data Rate = 270 Mbps.
2.
Data Rate = 1485 Mbps.
3.
Error Free with timing Jitter typically = 0.2 UI, pathological pattern.
4.
Error Free with alignment Jitter typically = 0.25 UI, pathological pattern.
5.
Error Free with alignment jitter typically = 0.3 UI, pathological pattern.
Table 1-8.
SD/MUTE Specifications
Symbol
Parameter
VMUT_LO
Output voltage when input signal detected
1
—
0.16 x AVDD
—
V
VMUT_HI
Output voltage when input signal not detected
1
—
0.95 x AVDD
—
V
NOTE:
1.
Specified at recommended operating condition—see Table 1-2.
11
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M21204/M21214
SD and HD Cable Equalizers
1.4
Rev V2
Package Specification
The M21204/M21214 are available in a standard Pb-type package or in a RoHS compliant package. The RoHS
package is compliant with standard reflow profiles for Pb-type packages. The package is illustrated in
Figure 1-2 below.
Figure 1-2.
M21204/M21214 Packaging Details
12
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M21204/M21214
SD and HD Cable Equalizers
1.5
Rev V2
Manufactureability
The values shown in this section may change; however, these are standard requirements.
1.5.1
Electrostatic Discharge
Tested per JESD22-A114. This device passes 2000V of ESD Human Body Model (HBM) testing.
Tested per JESD22-C101. This device passes 500V of ESD Charged Device Model (CDM) testing.
Tested per EIA/JESD78. This device passes 150mA of trigger current at 85°C during Latchup testing.
1.5.2
Peak Reflow Temperature
M21204G/M21214G (RoHS compliant package): Peak reflow temperature is 260°C per JEDEC standards.
1.5.3
Moisture Sensitivity Level (MSL)
All versions of this device (Std Pb-type and RoHS compliant packages) are Moisture Sensitivity Level (MSL) 3 per
J-STD-020B and J-STD-033.
1.6
Design Considerations
For drop-in compatible applications the M21204/M21214 will be constrained to operate within an existing PCB
layout. For new designs, the M21204/M21214 may use the existing legacy layout or it may be operated with 2.5V
power supply rails.
See Digital Video Interfacing Application Note (212xx-APP-001-A) for guidance on the following:
•
Component Placement and Layout
•
Routing Considerations
1.6.1
Thermal Considerations
The M21204/M21214 consume less power than the legacy GS9064/GS1524 devices, therefore for existing
designs, the M21204/M21214 will contribute less thermal energy and should result in a lower operating
temperature.
13
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
2.0 Functional Description
2.1
Pin Descriptions
2.1.1
General Nomenclature
Through out this data sheet, physical pins will be denoted in BOLD print. An array of pins can be called by each
individual pin name (e.g. MF0, MF1, MF2, MF3, and MF6) or as an array (e.g. MF[6, 5..0] or MF[6:0]).
2.1.2
High-Speed Input
Digital video coaxial cables are AC coupled to the high-speed low-noise inputs, SDI/SDI, which, are designed to
operate in both the single-ended or differential mode. The typical application is single-ended into the non-inverting
SDI input with the inverting SDI input biased to match the bias on the used input.
For GS9064/GS1524 drop-in compatibility, the M21204/M21214 do not contain any internal input terminations and
require both external input termination as well as the matching circuit to exceed the SMPTE input return loss
specifications. The package and IC design of the M21204/M21214 have been optimized for high-speed
performance allowing them to exceed the SMPTE return loss spec by 5dB to 10dB using the recommended
external matching/termination network and commonly employed through-hole, or vertical mount 75Ω BNC
connectors. For non-inverting single-ended operation, the recommended input circuit is shown in Figure 2-1. For
differential operation, the matching/termination circuit on SDI should be duplicated on SDI. The internal pull ups
automatically bias SDI/SDI to 0.72 x AVDD for proper AC coupled operation.
Figure 2-1.
Single-ended Typical Input Matching/Termination Network
8.2 nH
BNC
4.7uF
M21204
M21214
SDI
75Ω
75Ω
SDI
4.7uF
37.5Ω
14
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M21204/M21214
SD and HD Cable Equalizers
2.1.3
Rev V2
High-Speed Output
The high-speed differential outputs after equalization are made available on the SDO/SDO pins. The M21204/
M21214 support power supply voltages of 2.5V or 3.3V. For backwards compatibility with a 3.3V power supply, the
M21204/M21214 output swing and common-mode is compatible with the GS9064 and GS1524, respectively.
2.1.4
Adaptive Equalization Selection
In typical operation, the adaptive equalization is enabled with EQ_BYP = Low, however, with EQ_BYP = High, the
adaptive equalization and DC restore circuits are bypassed and the input is fed directly to the output.
2.1.5
Cable Length Indicator
When the adaptive equalization is enabled (EQ_BYP = Low), an analog voltage inversely proportional to the cable
length is made available on CLEN. The same transfer function applies to all bit rates. When the adaptive
equalization is disabled (EQ_BYP = High), the voltage falls to its highest value (this indicates 0m cable length).
During an LOS (Loss Of input Signal) event, the voltage falls to its lowest value.
2.1.6
Output Mute and Signal Detect
When configured as an input by forcing a voltage on SD/MUTE = High (Vdd), the output of the M21204/M21214
will be inhibited at logic low (outputs muted). When SD/MUTE = Low (Vss), the output is never muted and the
programmable cable length based mute function is disabled.
When tied to a high-impedance input or left floating, the programmable inhibit based on cable length is enabled
and the pin is defined as an LOS output (logic). In the event of an LOS, the output is muted. The inhibit threshold is
set with an analog voltage applied to the THRESH input pin, this threshold will depend on cable type (e.g. Belden
1694A or 8281).
2.1.7
Equalizer Detailed Description
The basic equalizer design consists of interlaced stages of gain and equalization to maximize both the overall
equalization gain as well as the input sensitivity for maximum performance with minimum jitter. In order to achieve
maximum cable distances, the equalizer has over 50 dB of broadband signal boost and maintains an input
sensitivity of approximately 10 mV. Using a high-performance silicon process, high gain-bandwidth products are
achieved allowing for high-performance, wide dynamic range design with minimum power dissipation.
Since 270 Mbps and 1.485 Gbps signals are launched with different SMPTE specified rise and fall times which can
vary substantially (especially at the receive end after going though a wide dynamic range of valid cable lengths) the
M21204/M21214 equalization routine determines both the bit rate and the resultant signal HF attenuation as
opposed to just looking at the launch edge rates. By determining both sets of conditions, it is possible to optimize
the equalizer for both HD and SD performance. Therefore, the M21204/M21214 maintain the same maximum
cable length as optimized SD only equalizers. For example, a SD signal through a short cable can have the same
edge rate as a HD signal through a long cable; yet, both conditions require different levels of equalization as well
as different optimized inverse-transfer functions. The advanced equalization technology can make the distinction
between the two cases for optimal performance. This also leads to proper mute threshold (THRESH) and cable
length indicator (CLEN) operation that is independent of the bit rate.
15
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
In order to accommodate both the SMPTE worst case equalizer pathological patterns as well as some customer
derived worst case DC offset patterns, a high-gain slicer is included in the signal path to correct for any eyecrossing wander due to AC coupling of the input.
Figure 2-2 shows the test setup used by MACOM to evaluate the performance of the M21204/M21214 cable
equalizers.
Figure 2-2.
Test Setup Diagram for M21204/M21214 Cable Equalizer Evaluation
HD/SD-SDI Video
Pattern Generator
(Tektronix TG2000
or Equivalent )
2.2
75Ω Coaxial Cable
M212 x4
Cable
Equalizer
M21212
Cable
Driver
HD/SD-SDI Video
Monitor (Tektronics
WFM700 or
equivalent )
M21204/M21214 Common Signals by Interface
Group
Table 2-1.
Power Pins
Pin Name
Pin Number
AVSS
3, 6, 11, 14
AVDD
2, 15
Table 2-2.
Function
Type
Ground
Power
Positive Supply
Power
High-speed Signal Pins
Pin Name
Pin Number
SDI/SDI
4, 5
SDO/SDO
13, 12
Function
Default
Non-inverting and Inverting Serial Data Input to GS9064/GS1524 compatible at 3.3V
the adaptive equalizer
and external termination required.
Non-inverting and Inverting Serial Data Output
GS9064/GS1524 compatible at 3.3V
Type
I—AC coupled high speed
O—high speed CML
16
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M21204/M21214
SD and HD Cable Equalizers
2.2.1
Table 2-3.
Rev V2
M21204/M21214 Pins
M21204/M21214 Control/Interface Pins
Pin Name
Pin Number
Function
Default
Type
CLEN
1
Cable length Indicator output
—
Analog
THRESH
10
Input control signal. Programmable cable length
forced mute threshold. This function is disabled if
SD/MUTE = Low.
Internal pull down
Analog
SD/MUTE
16
Bi-directional Signal that can be used as an input
control signal or as an output status indicator.
—
I/O
Internal pull down
I—CMOS
Internal pull up
Analog
When configured as an input by forcing a voltage
on SD/MUTE = High (a voltage greater that 1.2V),
the SDO outputs will be inhibited at logic low
(outputs muted).
When SD/MUTE = Low, the output is never muted
and the programmable cable length based mute
function is disabled.
When configured as an output (tied to a highimpedance input) or left floating, the
programmable inhibit based on cable length is
enabled.
Configured as Output:
Low = Input signal detect
High = Loss of signal
Configured as Input:
Low = Never mute
High = Force Mute
EQ_BYP
9
Input control signal that when enabled (High)
bypasses the inputs directly to the output stage.
Low = Normal operation
High = Disables EQ and bypasses input to output
AGC/AGC
7, 8
External AGC (Automatic Gain Control) capacitor
connection points. Use 1.0uF capacitor.
NOTE:
Internal pull-up/pull-down is 100 kΩ
17
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M21204/M21214
SD and HD Cable Equalizers
Figure 2-3.
Rev V2
M21204/M21214 Pin Assignments
CLEN
1
16
SD/MUTE
AVDD
2
15
AVDD
AVSS
SDI
SDI
AVSS
AGC
AGC
M21214
3 M21204 14
4
13
Wideband
5 Adaptive 12
6 Cable 11
Equalizer
AVSS
SDO
SDO
AVSS
7
10
THRESH
8
9
EQ_BYP
18
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
Appendix
A.1
Glossary of Terms/Acronyms
ASIC
Application Specific Integrated Circuit
DTV
Digital Television
DVB
Digital Video Broadcast
EQ
Equalizer or Equalization
HD
High Definition
SD
Standard Definition
SDI
Serial Digital Interface
SMPTE
Society of Motion Picture and Television Engineers
A.2
Reference Documents
A.2.1
External
Society of Motion Picture and Television Engineers
SMPTE 292M Bit-Serial Digital Interface for High-Definition Television Systems
SMPTE 259M 10-Bit 4:2:2 Component and 4fSC Composite Digital Signals—Serial Digital Interface
SMPTE 344M 540Mb/s Serial Digital Interface
DVB Digital Video Broadcast
19
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M21204/M21214
SD and HD Cable Equalizers
Rev V2
M/A-COM Technology Solutions Inc. All rights reserved.
Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM")
products. These materials are provided by MACOM as a service to its customers and may be used for
informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or
in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM assumes
no responsibility for errors or omissions in these materials. MACOM may make changes to specifications and
product descriptions at any time, without notice. MACOM makes no commitment to update the information and
shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its
specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any
intellectual property rights is granted by this document.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR
WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL
DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER
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MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR
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WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
MACOM products are not intended for use in medical, lifesaving or life sustaining applications. MACOM customers
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MACOM for any damages resulting from such improper use or sale.
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