M21528G-13 [TE]
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver;
| 型号： | M21528G-13 |
| 厂家： | 
TE CONNECTIVITY |
| 描述： | Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver |
| 文件： | 总22页 (文件大小：760K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
•
Input equalization for up to 36" of FR4 + 2 connectors
Integrated, selectable 75 or 50 output termination
Integrated 50 input termination
Applications
•
•
•
•
•
•
•
•
•
•
•
3G/HD/SD Video Switchers
3G/HD/SD Video Routers
Integrated 2x2 crosspoint switch with broadcast mode
On-chip regulators for operation from 1.8V to 3.3V DC supply
Universal DC coupling at the input, from 1.2V to 3.3V
3G/HD/SD Distribution Amplifiers
DVB-ASI Equipment
SMPTE 259C/D, 292M, 424M, DVB ASI 270Mb/s
Cable detect with automatic power down and power up upon cable disconnect
and re-connect
Features
•
•
•
•
•
•
Loss of input signal detection
•
•
•
•
•
•
Dual channel cable driver
Independent channel mute and power down
Industrial operating temperature range: -40°C to 85°C
4 kV HBM and 500V CDM ESD rating
4 mm x 4 mm 24 pin QFN package
Green and RoHS compliant
Two pairs of non-inverting, SMPTE compliant outputs
Typical output jitter of 12 ps peak–to–peak at 2.97 Gbps
Exceptional Output Return Loss with no matching network
Very low power design; 40 mW/channel @1.8V
Selectable slew rate for SD and 3G/HD operation
The M21528 is a very low power, highly integrated, dual cable driver for SMPTE compliant digital video applications. It can drive 2 pairs
of 75 coaxial cables, or 50 equivalent loads, at SDI data rates from 270 Mbps to 2.97 Gbps. The device is capable of outputting SDI
signals with typical jitter values of 12 ps peak–to–peak, when operating at 2.97 Gbps.
The dual cable driver includes a 2x2 input crosspoint and integrated input and output termination resistors. The M21528, with input
equalization for up to 36" of FR4 trace in addition to two connectors and exceptional Output Return Loss (ORL), is ideal for high speed,
3G-SDI, designs.
The device features integrated supply regulators, allowing it to be powered from 1.8V, 2.5V, or 3.3V supply voltages. When operating at
1.8V, it consumes only 40 mW per channel at 2.97 Gbps. Furthermore, the power rails for the input and output circuitry are electrically
isolated on-chip and as such may be connected to different voltage rails on the board. This feature enables the M21528 to be DC cou-
pled to any upstream device in the 1.2V to 3.3V range.
The integrated 2x2 crosspoint allows for either input to be routed to either output, eliminating the need for an external multiplexer. Addi-
tionally, one input may be routed to both outputs. The cable driver also provides cable detect and Loss of Signal (LOS) functionality. It
can be configured to automatically power down at cable disconnect or loss of input signal.
The M21528 is offered in a green and RoHS compliant 24 pin QFN package.
M21528 Block Diagram
75Ω/50Ω
SDO0A
LOS
SDI0P
75Ω/50Ω
SDO0B
IE
SDI0N
2 x 2
Crosspoint
SDI1P
IE
SDO1A
SDO1B
75Ω/50Ω
75Ω/50Ω
SDI1N
LOS
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.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support
M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Ordering Information
Part Number
Package
Operating Temperature
M21528G-13
4 mm x 4 mm 24-pin QFN (RoHS compliant)
–40 °C to 85 °C
* The letter “G” designator after the part number indicates that the device is RoHS compliant. The RoHS compliant devices are backwards compatible with 225 °C
reflow profiles.
Revision History
Revision
Level
Date
Description
V4
V3
Release
Release
December 2015
May 2015
Added footnotes to Figure 3-7.
Revised Z_CTRL resistor value for 75 output impedance in Table 3-1.
Revised Section 4.3.
Updated Marking Diagram.
Updated Figure 3-7 with new package diagram.
E (V2)
D (V1)
Release
Release
March 2010
Corrected Figure 3-7 center pad dimensions.
Revised Table 1-5; DRIN min, JAO 3G, HD max.
December 2009
Added marking diagram.
Added Eye Diagams in Section 2.0.
Revised typical and Maximum values in Table 1-3.
Revised Table 1-4.
Revised Figure 3-2 and Figure 3-3.
C (V1P)
Preliminary
May 2009
Added Note 5 to Table 1-5.
Removed Note 2 from Table 3-1 (2-state/I-Digital inputs have an internal 100K resistor to
AV I).
DD
Revised Figure 4-3, Figure 4-4, Figure 4-5.
Added input/output circuits in Section 3.0.
B (V2A)
A (V1A)
Advance
Advance
February 2009
June 2008
Major revisions throughout document.
Initial Release.
M21528 Marking Diagram
52813
XXXX.X
Part Number
Lot Number
YYWWCO
Date Country of Origin
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.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support
M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.0 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.0 Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.0 Pinout Diagram, Pin Description, and Package Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.2 Input Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.3 Output Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.4 Power Supply Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.5 Logic Control Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.5.1
4.5.2
4.5.3
Slew Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Crosspoint Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Powerdown Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6 Cable Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
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.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support
M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
1.0 Electrical Characteristics
Unless noted otherwise, specifications apply for typical recommended operating conditions shown in Table 1-2,
15
with AV O = 1.8V, AV I = 1.2V, CML inputs at 800 mV differential (RL = 50), PRBS 2 – 1 test pattern at 2.97
DD
DD
Gbps.
Table 1-1.
Absolute Maximum Ratings
Symbol
Parameter
Note
Minimum
Typical
Maximum
Unit
AV
I
Analog supply for input circuitry
Analog supply for output circuitry
Storage Temperature
1
1
1
1
1
1
1
1
1
-0.5
-0.5
-65
—
—
—
—
—
—
—
—
—
3.6
3.6
150
4
V
V
DD
AV O0/1
DD
T
ºC
KV
V
ST
ESD
ESD
LU
Human Body Model (HBM)
Charge Device Model (CDM)
Latch Up @ 85ºC
-4
-500
-200
-100
-100
-0.5
500
200
100
100
mA
mA
mA
V
HSIC
HSOC
Maximum High-speed input current
Maximum High-speed output short circuit current
Input voltage range
V
AV I+0.5
INMAX
DD
NOTES:
1. Exposure to these conditions over extended periods of time may affect device reliability
Table 1-2.
Recommended Operating Conditions
Parameter
Symbol
Note
Minimum
Typical
Maximum
Unit
AV
I
Analog supply for input circuitry
—
1.14
1.2, 1.8,
3.465
V
DD
2.5, or 3.3
AV O0/1
Analog supply for output circuitry
—
1.71
1.8, 2.5, or
3.3
3.465
V
DD
o
T
Operating temperature
1
-40
-4
25
—
+85
4
C
CASE
ESD
NOTES:
1. Case temperature.
Human Body Model (HBM)
—
kV
4
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.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support
M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Table 1-3.
Power Consumption Specifications
Symbol
Parameter
Conditions
Note Minimum
Typical Maximum Unit
P
Total power consumption
AV I = 1.2V
1
78
122
mW
DISS
DD
AV O = 1.8V
—
DD
Both channels active, 4 outputs on
AV I = 1.2V
1
61
95
mW
DD
AV O = 1.8V
DD
—
Both channels active, one output per channel
on
AV I = 1.2V
1
49
86
mW
DD
AV O = 1.8V
—
DD
One channel active, one output on
I_ AV
I_ AV
I_ AV
I
I
I
Total AV I supply current
AV I = 1.2V
1
1
—
—
—
—
—
—
—
1
3.0
7.0
mA
mA
mA
mA
mA
mA
DD
DD
DD
DD
DD
Total AV I supply current
AV I = 1.8V
3
DD
DD
Total AV I supply current
AV I = 3.3V
1
10
43
43
27
63
17.0
68.0
68.0
49.0
—
DD
DD
I_ AV
I_ AV
O
O
Total AV O supply current
Both channels active
Only channel 0 active
Only channel 1 active
1,2
1,2
1,2
3
DD
DD
DD
Total AV O supply current
DD
I_ AV O0 Total AV O0 supply current
DD
DD
o
θJA
Junction to ambient Thermal
Resistance
C/W
NOTES:
1. Recommended operating condition—see Table 1-2.
2. Current consumption does not change with AV O = 1.8V, 2.5V or 3.3V.
DD
3. Airflow = 0 m/s.
Table 1-4.
Digital Input Specifications
Symbol
Parameter
Note
Minimum
Typical
Maximum
Unit
V
Input Logic High
—
—
—
—
—
0.85 x AV
0.25 x AV
0
I
I
—
—
—
—
—
AV I + 0.5
V
V
IH
DD
DD
DD
V
V
I
Input Logic Floating State
Input Logic Low
0.75 x AV
0.15 x AV
100
I
I
IF
DD
DD
V
IL
Input Current—Logic High
Input Current—Logic Low
-100
A
A
IH
I
-100
100
IL
5
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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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Table 1-5.
High Speed Input/Output Electrical Specifications
Symbol
Parameter
Note
Minimum
Typical
Maximum
Unit
V
Output Voltage Range
1
1,3,4
1
730
400
—
800
600
70
—
—
—
—
60
12
—
—
—
—
—
—
0
850
800
90
mV
ps
O
t /t
SD Rise/Fall Time (20–80%)
r f
t /t
3G/HD Rise/Fall Time (20–80%)
SD Rise/Fall Time Mismatch
ps
r f
t -t
1,3,4
1,3
1,4
1,3
1,2,4
1,2
6,8
5,8
6,8
—
—
125
30
ps
r f
t -t
3G/HD Rise/Fall Time Mismatch
Duty Cycle Distortion, SD
—
ps
r f
DCD
DCD
—
100
30
ps
Duty Cycle Distortion, 3G, HD
Additive Output Jitter, SD
—
ps
JAO
JAO
—
100
29
ps
PP
PP
Additive Output Jitter, 3G, HD
Output Return Loss (5 MHz to 1.5 GHz)
Output Return Loss (5 MHz to 3.0 GHz)
Output Return Loss (5 MHz to 3.0 GHz)
Input Data rate
—
ps
S
S
S
20
11
—
dB
dB
dB
Mbps
mV
V
22
—
22
22
14
270
400
—
DR
2970
1600
IN
V
V
Differential Input Voltage (p–p)
Input Common mode range
7
ID
IC
—
AV I – 0.6
AV I + 0.1
DD
DD
IE
Input Equalizer Gain Off (EN_EQ = 0)
Input Equalizer Gain Med (EN_EQ = F)
Input Equalizer Gain High (EN_EQ = H)
—
—
—
—
40
—
—
—
60
dB
dB
dB
—
4
—
6
R
Input Termination to AV
I
DD
—
50
INT
NOTES:
1. Measured AC coupled into 1m coaxial cable, terminated with appropriate 75 or 50 load.
15
2. Measured with PRBS 2 -1 test pattern.
3. For data rates above 360 Mb/s, the cable driver must be in HD mode (SD/xHD = 0).
4. SD/xHD = 1, measured at 270 Mb/s.
5. Without external matching network.
6. With external matching network R
=75, L
=1nH, only applicable to 75 mode.
matching
matching
7. EQ_EN = L (input equalization off) PD_MODE = F (LOS enabled), point blank.
8. As measured on MACOM EVM at BNC connector with output impedance set to 75.
6
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For further information and support please visit:
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
2.0 Typical Performance Characteristics
Figure 2-1. Eye Diagram at 270 Mbps
Figure 2-2. Eye Diagram at 1485 Mbps
Figure 2-3. Eye Diagram at 2970 Mbps
7
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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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
3.0 Pinout Diagram, Pin Description, and
Package Drawing
Figure 3-1. Pinout Diagram (Top View)
SDI0P
SDI0N
1
2
3
4
5
6
18
17
16
15
14
13
SDO0B
AVDDReg0
AVDDO0
AVDDO1
AVDDReg1
SDO1B
EN_EQ0
EN_EQ1
SDI1P
M21528
4mmX4mm
QFN
SDI1N
8
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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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Table 3-1.
Pin Description (1 of 2)
Pin Name
Pin Number
Type
Description
AV
Center Ground Paddle
Power
Power
Power
Power
Power
Power
Chip Ground
Positive supply for inputs circuitry
SS
AV
I
9
DD
AV Reg0
17,20
11,14
16
Regulator0 bypass capacitor connection, positive supply for output0
Regulator1 bypass capacitor connection, positive supply for output1
Positive supply for reglator0
DD
AV Reg1
DD
AV O0
DD
AV O1
15
Positive supply for reglator1
DD
SDO0A
SDO0B
SDO1A
SDO1B
SDI0P/N
SDI1P/N
Z_CTRL
19
18
12
13
1,2
5,6
22
O-Analog
O-Analog
O-Analog
O-Analog
I-Analog
I-Analog
I-Analog
High speed serial output, channel0, output A
High speed serial output, channel0, output B
High speed serial output, channel1, output A
High speed serial output, channel1 output B
High speed serial video data input, channel0
High speed serial video data input, channel1
Sets output impedance through an external Z_CTRL resistor
connected to AV
SS
Z_CTRL=665 to set 75 output impedance
Z_CTRL=250 to set 50 output impedance
SD/xHD0
SD/xHD1
PD0
24
7
I-DIGITAL
I-DIGITAL
Output slew rate control for channel 0
L = SDO0 has 3G/HD slew rate
H = SDO0 has SD slew rate
Output slew rate control for channel 1
L = SDO1 has 3G/HD slew rate
H = SDO1 has SD slew rate
23
3-state/I-DIGITAL Power down control for channel 0
L = SDO0A on, SDO0B power down
F = Both outputs on
H = Power down both outputs
PD1
8
3-state/I-DIGITAL Power down control for channel 1
L = SDO1A on, SDO1B power down
F = Both outputs on
H = Power down both outputs
XPT_CTRL
21
3-state/I-DIGITAL Crosspoint control
L = SDI0 to SDO1, SDI1 to SDO0
F = SDI0 to SDO0, SDI1 to SDO1
H = SDI0 to SDO0 and SDO1
9
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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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Table 3-1.
Pin Description (2 of 2)
Pin Name
Pin Number
Type
Description
PD_MODE
10
3-state/I-DIGITAL Power down and cable detect control
L = Cable detect disabled, PD upon LOS disabled
F = Cable detect enabled, PD upon LOS enabled
H = Cable detect enabled, PD upon LOS disabled
EN_EQ0
EN_EQ1
3
4
3-state/I-DIGITAL Input equalization control for channel 0
L = No Input Equalization on SDI0P/N
F = Medium Input Equalization on SDI0P/N
H = High Input Equalization on SDI0P/N
3-state/I-DIGITAL Input equalization control for channel 1
L = No Input Equalization on SDI1P/N
F = Medium Input Equalization on SDI1P/N
H = High Input Equalization on SDI1P/N
NOTES:
1. 3-state inputs have a default of F (floating).
2. A Z_CTRL resistance of 665 will also provide 800mVpp output swing.
Figure 3-2. Differential Input (SDIP, SDIN)
AVDD
I
50Ω
SDIP
AVSS
Input Buffer
with Trace
Equalizer
AVDD
I
50Ω
SDIN
AVSS
10
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Figure 3-3. Single-Ended Output (SDO0A, SDO0B, SDO1A, SDO1B)
AVDDReg
50Ω / 75Ω
Set by Z _CTRL
SDO
AVSS
Figure 3-4. Digital Input Pin (SD/xHD0, SD/xHD1)
AVDD
I
2.0kΩ
INPUT
AVSS
11
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Figure 3-5. State Logic Input (PD0, PD1, XPT_CTRL, PD_MODE, EN_EQ0, EN_EQ1)
AVDD
I
VREF_LOW
AVDD
I
2.0kΩ
INPUT
AVSS
AVDD
I
AVSS
VREF_HIGH
AVSS
The M21528 is assembled in 24 pin 4 mm x 4 mm Quad Flat No-Lead (QFN) package. The exposed die paddle
serves as the IC ground (AV ), and the primary means of thermal dissipation. This die paddle should be soldered
SS
to the PCB ground. A cross-section of the QFN package can be found in Figure 3-6.
Figure 3-6. QFN Package Cross Section
Mold Compound
Ag Plating
Die
Solder
Plating
Gold Wire
Cu Leadframe
Down Bond
Ground Bond
Die Attach Material
Exposed Die
Paddle
12
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Figure 3-7. Package Drawing
1. For dimension reference A, Min. is 0.800, Nom. is 0.850 and Max. is 0.900.
2. New Unisem package and old Amkor package have the same footprint dimensions.
13
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.0 Functional Description
4.1
Block Diagram
Figure 4-1 is the functional block diagram of the M21528. The subsequent sections provide additional detail on the
operation of the device.
Figure 4-1. M21528 Functional Block Diagram
AVDDO1
AVDDO0
Cable
Detect
Z
Regulator
LOS
Control Logic
Control
R
R
SDO0A
SDO0B
AVDD
I
2 x 2
Xpoint
SDI0P
SDI0N
Input
Buff &
FR4 EQ
SDI1P
SDI1N
SDO1A
SDO1B
R
R
14
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.2
Input Description
The M21528 has differential inputs, with integrated 50 pull ups to AV I. AV I may be supplied from a 1.2V,
DD
DD
1.8V, 2.5V, or 3.3V supply. The input buffers are compatible with PCML, LVDS or LVPECL signal levels.
To improve signal integrity in large systems, all inputs have programmable input equalization (IE) with three gain
levels: 0 dB, 4 dB, 6 dB.
Setting the gain to 0dB effectively disables the IE feature. The pins EN_EQ0 and EN_EQ1 allow for the selecting
the proper level of input equalization based on the board characteristics for each input. The maximum level of
equalization compensates for up to 36” of FR4 trace. The operation of the EN_EQ0/1 pin is summarized in
Table 4-1 below.
Table 4-1.
Pin
Operation of EQ_EN0 and EQ_EN1 Pins
Level
Function
EN_EQ0
L
F
H
L
SDI0P/N IE EQ gain = 0 dB
SDI0P/N IE EQ gain = 4 dB
SDI0P/N IE EQ gain = 6 dB
SDI1P/N IE EQ gain = 0 dB
SDI1P/N IE EQ gain = 4 dB
SDI1P/N IE EQ gain = 6 dB
EN_EQ1
F
H
In 3G/HD/SD SDI applications, it is best to avoid AC coupling data interfaces between devices, if possible. DC
coupling will result in increased system jitter margin. Also, DC coupling eliminates the requirement for additional
components on the board. In order to accommodate DC coupling to the upstream device, the AV I domain of the
DD
M21528 is electrically isolated from all other power domains on chip. This allows for it to be tied to the V of the
DD
previous device’s driver enabling a fully DC coupled system, as shown below.
Upstream
M21528
AVDDI
VDD
1.2V – 3.3V
50
50
15
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Alternatively, a “self-biasing” scheme can be used at the input. This offers the benefit of having the V
of the
DD
previous device and the power domain(s) of the M21528 completely separated, while allowing dc coupling:
Previous device
VDD
M21528
AVDDI
0.1uF
50
50
In this configuration, the minimum input common mode that can be tolerated, is 1.2V.
If, for any reason, AC coupling is necessary, then a capacitor of 4.7 µF or greater must be used.
A Loss of Signal (LOS) detector circuit monitors each input and issues an internal alarm when the input signal goes
below the detection threshold. The detection threshold is 90 mVpp with +90 mV hysteresis. This means that if the
input signal level drops below 90 mVpp, then the internal LOS alarm is asserted. For the alarm to be de-asserted,
the input signal must increase to greater than 180 mVpp; the hysteresis prevents the internal LOS alarm from
chattering.
Depending on the state of the PD_MODE pin, the LOS alarm at a particular input can power down the associated
signal path and forces the corresponding output to low level.
4.3
Output Description
The M21528 contains two independent signal channels, each with two positive polarity cable driver outputs. Unlike
conventional SMPTE compliant cable drivers, the M21528 uses a voltage mode implementation as opposed to
current mode. This allows for significant power savings when compared to previous generation cable drivers with
the added benefit of two positive polarity outputs per channel.
Internally an output buffer drives a 1.6V amplitude signal through an integrated impedance load. The impedance of
the load is set by the external Z_CTRL resistor to AV . For most applications Z_CTRL should be 665, which
SS
sets the output load to 75 and provides 800mVpp output swing. If the application requires a 50 output
impedance, Z_CTRL may be 250. In both cases Z_CTRL must have 1% tolerance.
The M21528 can meet SMPTE ORL specifications without the need for an external matching network. However,
for additional margin a matching network consisting of a 75 resistor and a 1 nH inductor may be used.
Each channel has a dedicated power down pin, PD0 and PD1. The operation of the PD pin is summarized in
Table 4-2 below. When powered down, the signal at the output is set to low.
16
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Table 4-2.
Pin
Operation of PD0 and PD1 Pins
Level
Function
PD0
L
F
H
L
SDO0A on, SDO0B powered down
Both SDO0A and SDO0B on
Both SDO0A and SDO0B powered down
SDO1A on, SDO1B powered down
Both SDO1A and SDO1B on
PD1
F
H
Both SDO1A and SDO1B powered down
Figure 4-2 shows a typical output circuit.
When the cable detect function is enabled, only the outputs used need to be connected, unused outputs may be
left floating.
However, if the cable detection function is disabled, unused outputs must be powered down or properly terminated.
Figure 4-2. Typical Output Circuit (all outputs connected)
Circuit A
SDO0A
4.7 µF
M21528
SDO0B
Circuit A
SDO1A
Circuit A
SDO1B
Circuit A
17
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.4
Power Supply Description
The device features two internal regulators to supply the power for the output drivers for each channel. AV O0
DD
and AV O1 supply the voltage to each channel’s respective regulator. These pins may be connected to DC
DD
voltages ranging from 1.8V to 3.3V. Each regulator requires an external 1µF bypass capacitor to ground, which
must be connected to AV Reg0 and AV Reg1. It is recommended to add a secondary 10 nF bypass capacitor
DD
DD
on each regulator output as close to the pin as possible.
In addition to supplying the output stage for channel1, AV O1 is also used to power the core circuitry for both
DD
channels.
A completely separate supply domain, AV I, provides the supply for the high-speed serial input pins. The input
DD
termination and ESD protection for the SDI pins and the digital control input pins are referenced to this supply. The
isolated domain allows DC coupling to an upstream device that is running from a different supply voltage. For
example, if, in order to save power, AV O0/1 are connected to 1.8V, but the cable driver must interface to a
DD
reclocker that uses a 3.3V supply, then DC coupling can be achieved by simply connecting AV I to the 3.3V rail.
DD
Figure 4-3 to 4-5 show three examples of how the cable driver can be configured. Note that even when only one
channel is enabled, both output regulators must be supplied with the correct voltage.
Figure 4-3. Supply configuration, both channels and both A and B outputs used
1.2V to 3.3V
PD0
PD1
AVDD
I
AVDDReg0
1μF
1μF
10 nF
AVDDO1
AVDDO0
1.8V to 3.3V
AVDDReg1
10 nF
0.1uF
18
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
Figure 4-4. Supply configuration, channel0, outputs A and B used, channel 1 powered down
1.2V to 3.3V
PD0
PD1
AVDD
I
AVDDReg0
1μF
1μF
10 nF
AVDDO1
AVDDO0
1.8V to 3.3V
AVDDReg1
10 nF
0.1uF
Figure 4-5. Supply configuration, both channels used, but only A outputs used
1.2V to 3.3V
PD0
PD1
AVDD
I
AVDDReg0
1μF
1μF
10 nF
AVDDO1
AVDDO0
1.8V to 3.3V
AVDDReg1
10 nF
0.1uF
19
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.5
Logic Control Signals
The digital logic control signals are ESD protected and referenced to the AV I. This allows the device to interface
DD
to many different logic levels from different supply domains.
Some pins have a state called “F”; this stands for “floating”. To assert this state leave the pin unconnected.
4.5.1
Slew Rate Control
Pins SD/xHD0 and SD/xHD1 control the slew rate of the associated channel outputs. To comply with the SMPTE
SD specification the slew rate is slowed down to approximately 600 ps when in SD mode. Note that there is no pull-
up on the SD/xHD pins, so it should not be left floating.
Table 4-3.
Pin
Operation of SD/xHD0 and SD/xHD1 Pins
Level
Function
SD/xHD0
L
H
L
Set SDO0A/B Slew rate to 3G/HD Levels
Set SDO0A/B Slew rate to SD Levels
Set SDO1A/B Slew rate to 3G/HD Levels
Set SDO1A/B Slew rate to SD Levels
SD/xHD1
H
4.5.2
Crosspoint Control
The XPT_CTRL pin controls the 2 x 2 crosspoint at the input. It can be used to redirect the input signal to the other
output or from channel 0 to make broadcast mode, so the input on channel 0 appears on both channel 0 and 1
outputs. This last mode is useful in distribution amplifiers where one input can drive fours positive outputs.
The crossover feature can be used in routers to select a second input bank. The functionality of the XPT_CTRL pin
is summarized in the table below.
Table 4-4.
Pin
Operation of XPT_CTRL Pin
Level
Function
XPT_CTRL
L
F
H
Crossover mode:
SDI0 routed to SDO1
SDI1 routed to SDO0
Default mode:
SDI0 routed to SDO0
SDI1 routed to SDO1
Broadcast mode:
SDI0 routed to SDO0 and SDO1
20
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.5.3
Powerdown Mode Control
The M21528 has integrated output cable detection and input LOS detection circuitry. Depending on the setting of
the PD_MODE pin, the device can automatically power down each channel when output cables are disconnected
or there is no signal present at the input.
The functionality of the PD_MODE pin is summarized in the table below.
Table 4-5.
Pin
Operation of PD_MODE
Level
Function
PD_MODE
L
F
H
Cable detection disabled
Power down on LOS disabled
Cable detection enabled
Power down on LOS enabled
Cable detection enabled
Power down on LOS disabled
4.6
Cable Detection
The M21528 features an integrated near-end cable detector. This circuit can detect whether a cable has been
disconnected from an output and whether or not it is reconnected without requiring any additional external
components.
Utilizing the cable detection feature has several system level advantages such as:
•
•
•
Reduced power consumption when no cable is connected to both outputs of a single channel
Reduced EMI
Eliminate the requirement for external termination
Depending on the state of the PD_MODE pin, when both output A and B of either channel are disconnected, the
device can automatically power down the channel resulting in a 75% power reduction for that channel.
Furthermore, if output B is manually powered down (PD = L), then disconnecting output A will result in completely
powering down the channel (both outputs).
Due to the detection mechanism, the signal at each output within a channel will experience a phase step of
approximately 15 ps when the other output’s state is changed: powered down, powered up, disconnected, or re-
connected.
If one output is disconnected but the other remains connected, and both outputs are toggling, the signal at the
connected output may experience up to 10% overshoot for a period of approximately 500 ns. The overshoot is
caused by the reflections coupled from the unconnected output to the connected one. 500 ns is the duration
required by the circuit to detect the disconnection. If cable detection is disabled and the output is not properly
terminated, the overshoot will persist. Therefore, it is strongly recommended to enable cable detection, or
terminate both outputs properly; when both outputs of one channel are turned on.
The cable detection function may be disabled by setting PD_MODE=L.
21
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M21528-13
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
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
INTELLECTUAL PROPERTY RIGHT. MACOM FURTHER DOES NOT WARRANT THE ACCURACY OR
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MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS,
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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