GENNUM GS9074A_09

GS9074A HD-LINX® II Adaptive Cable Equalizer
Features
Description
•
SMPTE 259M compliant
•
Automatic cable equalization
•
Multi-standard operation from 143Mb/s to 360Mb/s
The GS9074A 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)
The GS9074A is designed to support SMPTE 259M, and is
optimized for performance at 270Mb/s.
The GS9074A features DC restoration to compensate for
the DC content of SMPTE pathological test patterns.
•
Performance optimized for 270Mb/s
•
Typical maximum equalized length of Belden 1694A
cable: 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
Power consumption is typically 215mW using a 3.3V
power supply. The GS9074A is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant (RoHS compliant).
Applications
•
A voltage programmable mute threshold (MCLADJ) is
included to allow muting of the GS9074A output when an
approximate selected cable length is reached for SMPTE
259M signals. This feature allows the GS9074A to
distinguish between low amplitude SD-SDI signals and
noise at the input of the device. The serial digital outputs of
the GS9074A may be forced to a mute state by applying a
voltage to the MUTE pin.
SMPTE 259M Coaxial Cable Serial Digital Interfaces
CABLE LENGTH ADJUSTOR
CARRIER DETECT
MUTE
MCLADJ
CD
MUTE
BYPASS
SDI
SDI
EQUALIZER
DC RESTORE
OUTPUT
SDO
SDO
AGC
Figure A: GS9074A Functional Block Diagram
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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November 2009
www.gennum.com
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Revision History
Version
ECR
PCN
Date
Changes and/or Modifications
4
153754
–
November 2009
3
139635
38695
March 2006
2
138357
37278
November 2005
Converted to Data Sheet.
1
137888
–
September 2005
Corrected process to BiCMOS.
0
136165
–
March 2005
A
135927
–
February 2005
Updated to latest Gennum template.
Corrected pad standoff height and tolerances for pad width and package
dimension. Corrected pad shape.
Converted to Preliminary Data Sheet. Updated typical application circuit.
Updated Input/Output circuits. Updated AC and DC electrical characteristics.
Updated description of MUTE and CD functionality. Corrected minor typing
errors. Updated center pad dimensions on PCB footprint.
New document.
Contents
Features.................................................................................................................................................................1
Applications.........................................................................................................................................................1
Description...........................................................................................................................................................1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................3
1.1 GS9074A Pin Assignment ..............................................................................................................3
1.2 GS9074A Pin Descriptions .............................................................................................................3
2. Electrical Characteristics ............................................................................................................................5
2.1 Absolute Maximum Ratings ..........................................................................................................5
2.2 DC Electrical Characteristics ........................................................................................................5
2.3 AC Electrical Characteristics ........................................................................................................6
3. Solder Reflow Profiles..................................................................................................................................8
4. Test Circuit.......................................................................................................................................................9
5. Input / Output Circuits ............................................................................................................................. 10
6. Detailed Description.................................................................................................................................. 12
6.1 Serial Digital Inputs ...................................................................................................................... 12
6.2 Cable Equalization ........................................................................................................................ 12
6.3 Programmable Mute Output ...................................................................................................... 13
6.4 Mute and Carrier Detect .............................................................................................................. 13
7. Application Information .......................................................................................................................... 14
7.1 Typical Application Circuit ........................................................................................................ 14
8. Package and Ordering Information...................................................................................................... 15
8.1 Package Dimensions ..................................................................................................................... 15
8.2 Recommended PCB Footprint ................................................................................................... 16
8.3 Packaging Data ............................................................................................................................... 16
8.4 Ordering Information ................................................................................................................... 17
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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November 2009
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1. Pin Out
VEE_A
1
SDI
2
VCC_A
CD
MUTE
VCC_D
1.1 GS9074A Pin Assignment
16
15
14
13
12
VEE_D
11
SDO
3
10
SDO
4
9
VEE_D
GS9074A
(top view)
6
7
8
Center Pad
(bottom of package, internally
bonded to VEE_A)
MCLADJ
AGC
5
BYPASS
VEE_A
AGC
SDI
Figure 1-1: 16-Pin QFN
1.2 GS9074A Pin Descriptions
Table 1-1: Pin Descriptions
Pin Number
1, 4
Name
Timing
Type
Description
VEE_A
Analog
Power
Most negative power supply for analog circuitry.
Connect to GND.
2, 3
SDI, SDI
Analog
Input
Serial digital differential input.
5, 6
AGC, AGC
Analog
–
External AGC capacitors.
(See Section 7.1 Typical Application Circuit.)
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 270Mb/s.
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Table 1-1: Pin Descriptions (Continued)
Pin Number
9
Name
Timing
Type
Description
VEE_D
Analog
Power
Most negative power supply for the digital circuitry and output
buffer.
Connect to GND.
10, 11
12
SDO, SDO
Analog
Output
Equalized serial digital differential output.
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)
(Internal pull down resistor)
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
–
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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November 2009
Power
Internally bonded to VEE_A.
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2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Table 2-1 lists the absolute maximum ratings for the GS9074A. Conditions exceeding the
limits listed may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any other conditions above those listed in
the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
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
Reflow Temperature
260°C
Supply Voltage
-0.5V to +3.6 VDC
2.2 DC Electrical Characteristics
Table 2-2 shows the DC electrical characteristics of the GS9074A where conditions are
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown.
Table 2-2: DC Electrical Characteristics
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
Supply Voltage
VCC
–
3.135
3.3
3.465
V
±5%
Power Consumption
PD
TA = 25°C
–
215
–
mW
–
Supply Current
Is
TA = 25°C
–
65
–
mA
–
VCMOUT
TA = 25°C
–
VCC ΔVSDO/2
–
V
–
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
–
0.4
–
V
–
Output Common Mode
Voltage
Input Common Mode
Voltage
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Table 2-2: DC Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
VCD(OH)
Carrier not
present
2.4
–
–
V
–
VCD(OL)
Carrier present
–
–
0.4
V
–
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
–
CD Output Voltage
2.3 AC Electrical Characteristics
Table 2-3 shows the AC electrical characteristics of the GS9074A where conditions are
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown.
Table 2-3: AC Electrical Characteristics
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
Serial input data rate
DRSDO
–
143
–
360
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,
350m
–
0.2
–
UI
2
–
270Mb/s,
Belden 8281,
280m
–
0.2
–
UI
2
–
360Mb/s,
Belden 1694A,
190m
–
0.25
–
UI
2
–
360Mb/s,
Belden 8281,
140m
–
0.25
–
UI
2
Output Rise/Fall time
–
20% - 80%
–
80
220
ps
–
Mismatch in rise/fall time
–
–
–
–
30
ps
–
Duty cycle distortion
–
–
–
–
100
ps
–
Overshoot
–
–
–
–
10
%
–
Maximum Equalized Cable
Length
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Data Sheet
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Table 2-3: AC Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
Input Return Loss
–
–
15
–
–
dB
–
Input Resistance
–
single ended
–
1.64
–
kΩ
–
Input Capacitance
–
single ended
–
1
–
pF
–
Output Resistance
–
single ended
–
50
–
Ω
–
NOTES:
1. 0m cable length.
2. Equalizer Pathological.
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Data Sheet
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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 eutectic 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 Eutectic Solder Reflow Profile (Pb-free package)
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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4. Test Circuit
GigaBERT
1400
EXT. CLOCK DATA
CLOCK OUT
OUT
8281 or 1694A CABLE
50/75
IN
GS1574A/9074A
TEST BOARD
EXT.
CLOCK
1.485GHz/270MHz
OUT
CH. 1
OUT
CH. 2
TDS 820
EXT. TRIGGER
Figure 4-1: Test Circuit
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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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
50
50
SDO
SDO
Figure 5-3: Output Circuit
GS9074A HD-LINX® II Adaptive Cable Equalizer
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MUTE,
BYPASS
Figure 5-4: MUTE and BYPASS Circuits
CD
CD
Figure 5-5: CD Circuit
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6. Detailed Description
The GS9074A is a high speed BiCMOS IC designed to equalize serial digital signals.
The GS9074A can equalize SD serial digital signals, and will typically equalize greater
than 350m at 270Mb/s.
The GS9074A 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
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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6.3 Programmable Mute Output
The GS9074A incorporates a programmable threshold output mute (MCLADJ).
In applications where there are multiple input channels using the GS9074A, it is
advantageous to have a programmable mute output to avoid signal crosstalk.
The output of the GS9074A 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.
6.4 Mute and Carrier Detect
The GS9074A 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 GS9074A. 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 GS9074A 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.
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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7. Application Information
7.1 Typical Application Circuit
CD
MUTE
VCC
VCC
13
VCC_D
1
MUTE
6.2n
CD
VCC_A
SDI
14
15
16
10n
VEE_D
VEE_A
2
SDI
3
VEE_A
5
6
7
MCLADJ
37R4
BYPASS
4
75
SDO
SDI
AGC
1u
SDO
GS9074A
75
AGC
1u
10n
VEE_D
12
+
4u7
SDO
11
10
+
SDO
9
4u7
8
MCLADJ
470n
470n
BYPASS
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
Figure 7-1: GS9074A Typical Application Circuit
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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November 2009
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8. Package and Ordering Information
8.1 Package Dimensions
A
2.76+/-0.10
0.40+/-0.05
4.00+/-0.05
DATUM A
PIN 1 AREA
2X
2.76+/-0.10
4.00+/-0.05
B
CENTER TAB
DETAIL B
0.15 C
2X
DATUM B
0.15 C
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
0.65/2
0.00-0.05
0.85+/-0.05
TERMINAL TIP
0.65
DETAIL B
SCALE:NTS
Figure 8-1: GS9074A Package Dimensions
GS9074A HD-LINX® II Adaptive Cable Equalizer
Data Sheet
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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, θ j-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
GS9074A HD-LINX® II Adaptive Cable Equalizer
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8.4 Ordering Information
Table 8-2: Ordering Information
GS9074A
Part Number
Package
Temperature Range
GS9074ACNE3
16-pin QFN
0°C to 70°C
DOCUMENT IDENTIFICATION
CAUTION
DATA SHEET
ELECTROSTATIC SENSITIVE DEVICES
The product is in production. Gennum reserves the right to make changes to
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
STATIC-FREE WORKSTATION
GENNUM CORPORATE HEADQUARTERS
Phone: +1 (905) 632-2996
Fax: +1 (905) 632-2055
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E-mail: [email protected]
www.gennum.com
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E-mail: [email protected]
Phone: +82-2-414-2991
Fax: +82-2-414-2998
E-mail: [email protected]
E-mail: [email protected]
Gennum Corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. The sale of
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 2005 Gennum Corporation. All rights reserved.
www.gennum.com
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