Gennum GS1574ACTE3 Hd-linx ii adaptive cable equalizer Datasheet

GS1574A HD-LINX® II Adaptive Cable Equalizer
Features
Description
•
SMPTE 292M and SMPTE 259M compliant
•
Automatic cable equalization
•
Multi-standard operation from 143Mb/s to 1.485Gb/s
The GS1574A is a second-generation high-speed BiCMOS
integrated circuit designed to equalize and restore signals
received over 75Ω co-axial cable.
•
Supports DVB-ASI at 270Mb/s
•
Small footprint (4mm x 4mm)
•
Pb-free and RoHS compliant
•
Manual bypass (useful for low data rates with slow
rise/fall times)
•
Performance optimized for 270Mb/s and 1.485Gb/s
•
Typical equalized length of Belden 1694A cable: 200m
at 1.485Gb/s, 350m at 270Mb/s
•
50Ω differential output (with internal 50Ω pull-ups)
•
Manual output mute or programmable mute based on
max cable length adjust
•
Single 3.3V power supply operation
•
Operating temperature range: 0°C to +70°C
The GS1574A is designed to support SMPTE 292M and
SMPTE 259M, and is optimized for performance at 270Mb/s
and 1.485Gb/s.
Application
•
SMPTE 292M and SMPTE 259M Coaxial Cable Serial
Digital Interfaces
The GS1574A features DC restoration to compensate for
the DC content of SMPTE pathological test patterns.
A voltage programmable mute threshold (MCLADJ) is
included to allow muting of the GS1574A output when an
approximate selected cable length is reached for SMPTE
259M signals. This feature allows the GS1574A to
distinguish between low amplitude SD-SDI signals and
noise at the input of the device. The serial digital outputs of
the GS1574A may be forced to a mute state by applying a
voltage to the MUTE pin.
Power consumption is typically 215mW using a 3.3V
power supply. The GS1574A is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
CABLE LENGTH ADJUSTOR
CARRIER DETECT
MUTE
MCLADJ
CD
MUTE
BYPASS
SDI
SDI
EQUALIZER
DC RESTORE
OUTPUT
SDO
SDO
AGC
Figure A: GS1574A Functional Block Diagram
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
33416 - 10
August 2011
www.gennum.com
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Revision History
Version
ECR
PCN
Date
10
156775
–
August 2011
9
153754
–
September 2009
8
144435
–
March 2007
Added maximum power consumption to DC Electrical Characteristics.
7
141758
40438
August 2006
Modified 200m cable length in front page Features section and Detailed
Description.
6
141576
40438
August 2006
Added 200m output cable length jitter data at 1.485Gb/s in AC Electrical
Characteristics.
5
139634
38695
March 2006
Corrected pad standoff height and tolerances for pad width & package
dimension. Corrected pad shape.
4
137744
–
September 2005
3
137321
–
June 2005
Amended notes on use of MCLADJ above 360 Mb/s.
2
137167
–
June 2005
Rephrased RoHS compliance statement.
1
136885
–
May 2005
Corrected description of connection for AGC and AGC pins in the Pin
Description table. Clarified solder reflow profile descriptions. Corrected
minor typing errors.
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
33416 - 10
August 2011
Changes and/or Modifications
Added the tape and reel part number to Table 9-1: GS1574A Ordering
Information
Updated to latest Gennum template.
Convert to Data Sheet. Corrected typing errors. Corrected process to BiCMOS.
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Contents
Features.................................................................................................................................................................1
Application...........................................................................................................................................................1
Description...........................................................................................................................................................1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 GS1574A Pin Assignment ..............................................................................................................4
1.2 GS1574A Pin Descriptions .............................................................................................................4
2. Electrical Characteristics ............................................................................................................................6
2.1 Absolute Maximum Ratings ..........................................................................................................6
2.2 DC Electrical Characteristics ........................................................................................................6
2.3 AC Electrical Characteristics ........................................................................................................7
3. Solder Reflow Profiles..................................................................................................................................9
4. Test Circuit.................................................................................................................................................... 10
5. Input / Output Circuits ............................................................................................................................. 11
6. Detailed Description.................................................................................................................................. 13
6.1 Serial Digital Inputs ...................................................................................................................... 13
6.2 Cable Equalization ........................................................................................................................ 13
6.3 Programmable Mute Output ...................................................................................................... 14
6.4 Mute and Carrier Detect .............................................................................................................. 14
7. Application Information .......................................................................................................................... 15
7.1 PCB Layout ....................................................................................................................................... 15
7.2 Typical Application Circuit ........................................................................................................ 15
8. Package and Ordering Information...................................................................................................... 16
8.1 Package Dimensions ..................................................................................................................... 16
8.2 Recommended PCB Footprint ................................................................................................... 17
8.3 Packaging Data ............................................................................................................................... 17
8.4 Ordering Information ................................................................................................................... 18
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
33416 - 10
August 2011
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1. Pin Out
VEE_A
1
SDI
2
VCC_A
CD
MUTE
VCC_D
1.1 GS1574A Pin Assignment
16
15
14
13
12
VEE_D
11
SDO
3
10
SDO
4
9
VEE_D
GS1574A
(top view)
AGC
7
8
Center Pad
(bottom of package, internally
bonded to VEE_A)
MCLADJ
6
5
BYPASS
VEE_A
AGC
SDI
Figure 1-1: 16-Pin QFN
1.2 GS1574A Pin Descriptions
Table 1-1: GS1574A Pin Descriptions
Pin
Number
Name
Timing
Type
1, 4
VEE_A
Analog
Power
Description
Most negative power supply for analog circuitry.
Connect to GND.
2, 3
SDI, SDI
Analog
Input
5, 6
AGC, AGC
Analog
–
Serial digital differential input.
External AGC capacitor.
Connect pin 5 and pin 6 together as shown in the Typical Application
Circuit on page 13.
7
BYPASS
Not
Synchronous
Input
8
MCLADJ
Analog
Input
Forces the Equalizing and DC RESTORE stages into bypass mode when
HIGH. No equalization occurs in this mode.
Maximum cable length adjust.
Adjusts the approximate maximum amount of cable to be equalized
(from 0m to the maximum cable length). The output is muted (latched to
the last state) when the maximum cable length is achieved.
NOTE: MCLADJ is only recommended for data rates up to 360Mb/s. For
data rates above this, MCLADJ should be left floating.
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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Table 1-1: GS1574A Pin Descriptions (Continued)
Pin
Number
Name
Timing
Type
9
VEE_D
Analog
Power
Description
Most negative power supply for the digital circuitry and output buffer.
Connect to GND.
10, 11
SDO, SDO
Analog
Output
Equalized serial digital differential output.
12
VEE_D
Analog
Power
Most negative power supply for the digital circuitry and output buffer.
Connect to GND.
13
VCC_D
Analog
Power
Most positive power supply for the digital I/O pins of the device.
Connect to +3.3V DC.
14
MUTE
Not
Synchronous
Input
CONTROL SIGNAL INPUT
levels are LVCMOS/LVTTL compatible. (3.3V Tolerant)
When the MUTE pin is set HIGH by the application interface, the serial
digital output of the device will be forced to a steady state.
When the MUTE pin is set LOW, the serial digital output of the device will
be active.
NOTE: This pin may be connected directly to the CD pin to allow mute on
loss of carrier.
15
CD
Not
Synchronous
Output
STATUS SIGNAL OUTPUT
Signal levels are LVCMOS/LVTTL compatible.
Indicates the presence of a good input signal.
When the CD pin is LOW, a good input signal has been detected.
When this pin is HIGH, the input signal is invalid.
This pin will indicate loss of carrier for data rates > 19Mb/s.
16
VCC_A
Analog
Power
Most positive power supply for the analog circuitry of the device.
Connect to +3.3V DC.
–
Center Pad
–
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
33416 - 10
August 2011
Power
Internally bonded to VEE_A.
5 of 16
2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Table 2-1: Absolute Maximum Ratings
Parameter
Value
Supply Voltage
-0.5V to +3.6 VDC
Input ESD Voltage
2kV
Storage Temperature Range
-50°C < Ts < 125°C
Input Voltage Range (any input)
-0.3 to (VCC +0.3)V
Operating Temperature Range
0°C to 70°C
Solder Reflow Temperature
260°C
2.2 DC Electrical Characteristics
Table 2-2: DC Electrical Characteristics
VCC = 3.3V ±5%,
TA = 0°C to 70°C, unless otherwise shown
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
3.135
3.3
3.465
V
±5%
Supply Voltage
VCC
–
Power Consumption
PD
TA = 25°C
–
215
–
mW
–
–
–
–
343
mW
–
Is
TA = 25°C
–
65
–
mA
–
VCMOUT
TA = 25°C
–
VCC - ΔVSDO/2
–
V
–
Input Common Mode Voltage
VCMIN
TA = 25°C
–
1.75
–
V
–
MCLADJ DC Voltage (to mute
signal)
–
0m, TA = 25°C
–
1.3
–
V
–
MCLADJ Range
–
TA = 25°C
–
0.5
–
V
–
2.4
–
–
V
–
–
–
0.4
V
–
Supply Current
Output Common Mode
Voltage
CD Output Voltage
VCD(OH)
Carrier not
present
VCD(OL)
Carrier present
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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Table 2-2: DC Electrical Characteristics (Continued)
VCC = 3.3V ±5%,
TA = 0°C to 70°C, unless otherwise shown
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
Mute Input Voltage Required
to Force Outputs to Mute
VMute
Min to Mute
2.0
–
–
V
–
Mute Input Voltage Required
to Force Outputs Active
VMute
Max to
Activate
–
–
0.8
V
–
2.3 AC Electrical Characteristics
Table 2-3: AC Electrical Characteristics
VCC = 3.3V ±5%, TA = 0°C to 70°C, unless otherwise shown
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
Serial input data rate
DRSDO
–
143
–
1485
Mb/s
–
Input Voltage Swing
ΔVSDI
TA =25°C, differential
720
800
950
mVp-p
1
Output Voltage Swing
ΔVSDO
100Ω load, TA =25°C,
differential
–
750
–
mVp-p
–
–
270Mb/s
Belden 1694A: 0-350m
Belden 8281: 0-280m
–
0.2
–
UI
2,5
–
1.485Gb/s
Belden 1694A: 0-140m
Belden 8281: 0-100m
–
0.25
–
UI
2,5
–
1.485Gb/s
Belden 1694A: 140-200m
–
0.3
–
UI
4,5
Output Rise/Fall time
–
20% - 80%
–
80
220
ps
–
Mismatch in rise/fall time
–
–
–
–
30
ps
–
Duty cycle distortion
–
–
–
–
30
ps
–
Overshoot
–
–
–
–
10
%
–
Input Return Loss
–
–
15
–
–
dB
3
Input Resistance
–
single ended
–
1.64
–
kΩ
–
Input Capacitance
–
single ended
–
1
–
pF
–
Output Resistance
–
single ended
–
50
–
Ω
–
Output Jitter for Various
Cable Lengths and Data
Rates
NOTES:
1. 0m cable length.
2. All parts production tested. In order to guarantee jitter over the full range of specification (VCC = 3.3V ±5%, TA = 0°C to 70°C, and
720-880mV launch swing from the SDI cable driver) the recommended applications circuit must be used.
3. Tested on CB1574A board from 5MHz to 2GHz.
4. Based on characterization data using the recommended applications circuit, at VCC = 3.3V, TA = 25°C, and 800mV launch swing from the SDI
cable driver.
5. Equalizer Pathological test signal is used.
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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3. Solder Reflow Profiles
The device is manufactured with Matte-Sn terminations and is compatible with both
standard eutectic and Pb-free solder reflow profiles. MSL qualification was performed
using the maximum Pb-free reflow profile shown in Figure 3-1. The recommended
standard Pb reflow profile is shown in Figure 3-2.
Temperature
60-150 sec.
20-40 sec.
260°C
250°C
3°C/sec max
217°C
6°C/sec max
200°C
150°C
25°C
Time
60-180 sec. max
8 min. max
Figure 3-1: Maximum Pb-free Solder Reflow Profile (Preferred)
60-150 sec.
Temperature
10-20 sec.
230°C
220°C
3°C/sec max
183°C
6°C/sec max
150°C
100°C
25°C
Time
120 sec. max
6 min. max
Figure 3-2: Standard Pb Solder Reflow Profile
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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4. Test Circuit
GigaBERT
1400
EXT. CLOCK DATA
CLOCK OUT
OUT
8281 or 1694A CABLE
50/75
IN
GS1574A
TEST BOARD
EXT.
CLOCK
1.485GHz/270MHz
OUT
CH. 1
OUT
CH. 2
TDS 820
EXT. TRIGGER
Figure 4-1: Test Circuit
5. Input / Output Circuits
3k
3k
SDI
SDI
RC
3.6k
3.6k
Figure 5-1: Input Equivalent Circuit
VCC
12.2k
+
MCLADJ
-
150µ
Figure 5-2: MCLADJ Equivalent Circuit
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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50
50
SDO
SDO
Figure 5-3: Output Circuit
MUTE,
BYPASS
Figure 5-4: MUTE and BYPASS Circuits
CD
CD
Figure 5-5: CD Circuit
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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6. Detailed Description
The GS1574A is a high speed BiCMOS IC designed to equalize serial digital signals.
The GS1574A can equalize both HD and SD serial digital signals, and will typically
equalize 200m of Belden 1694A cable at 1.485Gb/s and 350m at 270Mb/s.
The GS1574A is powered from a single +3.3V power supply and consumes
approximately 215mW of power.
6.1 Serial Digital Inputs
The serial data signal may be connected to the input pins (SDI/SDI) in either a
differential or single ended configuration. AC coupling of the inputs is recommended, as
the SDI and SDI inputs are internally biased at approximately 1.8V.
6.2 Cable Equalization
The input signal passes through a variable gain equalizing stage whose frequency
response closely matches the inverse of the cable loss characteristic. In addition, the
variation of the frequency response with control voltage imitates the variation of the
inverse cable loss characteristic with cable length.
The edge energy of the equalized signal is monitored by a detector circuit which
produces an error signal corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is integrated by both an internal and
an external AGC filter capacitor providing a steady control voltage for the gain stage. As
the frequency response of the gain stage is automatically varied by the application of
negative feedback, the edge energy of the equalized signal is kept at a constant level
which is representative of the original edge energy at the transmitter. The equalized
signal is also DC restored, effectively restoring the logic threshold of the equalized signal
to its correct level independent of shifts due to AC coupling. The digital output signals
have a nominal voltage of 750mVpp differential, or 375mVpp single ended when
terminated with 50Ω as shown in Figure 6-1.
+187.5mV
VCM = 2.925V
typical
SDO
-187.5mV
SDO
+187.5mV
50
50
VCM = 2.925V
typical
-187.5mV
Figure 6-1: Typical Output Voltage Levels
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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6.3 Programmable Mute Output
For SMPTE 259M inputs, the GS1574A incorporates a programmable threshold output
mute (MCLADJ).
In applications where there are multiple input channels using the GS1574A, it is
advantageous to have a programmable mute output to avoid signal crosstalk.
The output of the GS1574A can be muted when the input signal decreases below a
certain input level. This threshold is determined using the input voltage applied to the
MCLADJ pin. The MCLADJ pin may be left unconnected for applications where output
muting is not required.
This feature has been designed for use in applications such as routers where signal
crosstalk and circuit noise cause the equalizer to output erroneous data when no input
signal is present. The use of a Carrier Detect function with a fixed internal reference
does not solve this problem since the signal to noise ratio on the circuit board could be
significantly less than the default signal detection level set by the on chip reference.
NOTE: MCLADJ is only recommended for data rates up to 360Mb/s. For data rates above
this, MCLADJ should be left floating.
6.4 Mute and Carrier Detect
The GS1574A includes a MUTE input pin that allows the application interface to mute
the serial digital output at any time. Set the MUTE pin HIGH to mute SDO and SDO. In
this case, the outputs will mute regardless of the setting of the BYPASS pin.
A Carrier Detect output pin (CD) indicates the presence of a valid signal at the input of
the GS1574A. When CD is LOW, the device has detected a valid input on SDI and SDI.
When CD is HIGH, the device has not detected a valid input.
NOTE: CD will only detect loss of carrier for data rates greater than 19Mb/s. The CD
output pin may be connected directly to the MUTE input pin to enable automatic muting
of the GS1574A when no valid input signal has been detected.
NOTE: If the maximum cable length is exceeded and the device is not in bypass mode
the GS1574A will not assert the CD pin even if a carrier is present.
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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7. Application Information
7.1 PCB Layout
Special attention must be paid to component layout when designing serial digital
interfaces for HDTV. An FR-4 dielectric can be used, however, controlled impedance
transmission lines are required for PCB traces longer than approximately 1cm. Note the
following PCB artwork features used to optimize performance:
•
PCB trace width for HD rate signals is closely matched to SMT component width to
minimize reflections due to change in trace impedance.
•
The PCB ground plane is removed under the GS1574A input components to
minimize parasitic capacitance.
•
The PCB ground plane is removed under the GS1574A output components to
minimize parasitic capacitance.
•
High speed traces are curved to minimize impedance changes.
7.2 Typical Application Circuit
CD
MUTE
VCC
VCC
13
VCC_D
14
MUTE
6.2nH
15
CD
VCC_A
16
10n
1 VEE_A
SDI
1μF
2
75Ω
1μF
3
10nF
VEE_D
SDI
SDO
GS1574A
SDI
SDO
12
+
4.7μF
SDO
11
10
+
5
6
7
MCLADJ
VEE_A
AGC
4
AGC
37.4Ω
BYPASS
SDO
75Ω
VEE_D
9
4.7μF
8
MCLADJ
470nF
470nF
BYPASS
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
Figure 7-1: GS1574A Typical Application Circuit
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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8. Package and Ordering Information
8.1 Package Dimensions
A
2.76+/-0.10
2X
4.00+/-0.05
PIN 1 AREA
DATUM A
2.76+/-0.10
B
0.40+/-0.05
4.00+/-0.05
CENTER TAB
DETAIL B
0.15 C
DATUM B
0.15 C
2X
0.35+/-0.05
0.65
0.20 REF
16X
0.10 C
C
0.10
CAB
0.05
C
DATUM A OR B
16X
0.08 C
SEATING PLANE
0.00-0.05
0.85+/-0.05
0.65/2
TERMINAL TIP
0.65
DETAIL B
SCALE:NTS
Figure 8-1: Package Dimensions
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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8.2 Recommended PCB Footprint
0.35
0.65
0.55
3.70
2.76
CENTER PAD
NOTE: All dimensions
are in millimeters.
2.76
3.70
The Center Pad should be connected to the most negative power supply plane for analog
circuitry in the device (VEE_A) by a minimum of 5 vias.
Note: Suggested dimensions only. Final dimensions should conform to customer design
rules and process optimizations.
8.3 Packaging Data
Table 8-1: Packaging Data
Parameter
Value
Package Type
4mm x 4mm 16-pin QFN
Package Drawing Reference
JEDEC M0220
Moisture Sensitivity Level
3
Junction to Case Thermal Resistance, θj-c
31.0°C/W
Junction to Air Thermal Resistance, θj-a (at zero airflow)
43.8°C/W
Psi
11.0°C/W
Pb-free and RoHS compliant
Yes
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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August 2011
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9. Ordering Information
Table 9-1: GS1574A Ordering Information
Part Number
Package
Temperature Range
GS1574ACNE3
16-pin QFN
0°C to 70°C
GS1574ACTE3
16-pin QFN
(250pc tape and reel)
0°C to 70°C
DOCUMENT IDENTIFICATION
CAUTION
DATA SHEET
ELECTROSTATIC SENSITIVE DEVICES
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the product at any time without notice to improve reliability, function or
design, in order to provide the best product possible.
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A
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the circuit or device described herein does not imply any patent license, and Gennum makes no representation that the circuit or device is free from patent
infringement.
All other trademarks mentioned are the properties of their respective owners.
GENNUM and the Gennum logo are registered trademarks of Gennum Corporation.
© Copyright 2004 Gennum Corporation. All rights reserved.
www.gennum.com
GS1574A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
33416 - 10
August 2011
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