Semtech GS2964 Adaptive cable equalizer Datasheet

GS2964 Adaptive Cable Equalizer
Key Features
Description
•
SMPTE 424M, SMPTE 292M and SMPTE 259M
compliant
•
Automatic cable equalization
The GS2964 is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
coaxial cable.
•
Multi-standard operation from 143Mb/s to 2.97Gb/s
•
Performance optimized for 270Mb/s, 1.485Gb/s and
2.97Gb/s. Typical equalized length of Belden 1694A
cable:
Š 100m at 2.97Gb/s
Š 140m at 1.485Gb/s
Š 180m at 270Mb/s
•
Supports DVB-ASI at 270Mb/s
•
Manual bypass (useful for low data rates with slow
rise/fall times)
•
Programmable carrier detect with squelch threshold
adjustment
•
Standard EIA/JEDEC logic control and status signal
levels
•
Single 3.3V power supply operation
•
215mW power consumption (typical)
•
Wide temperature range of -40ºC to +85ºC
•
Small footprint QFN package (4mm x 4mm)
The Carrier Detect output pin (CD) indicates whether a
valid input signal has been detected. It can be connected
directly to the MUTE pin to mute the output on loss of
carrier. A voltage programmable threshold, which can be
changed via the SQ_ADJ pin, forces CD high when the
input signal amplitude falls below the threshold. This
allows the GS2964 to distinguish between low-amplitude
SDI signals and noise at the input of the device.
The equalizing and DC restore stages are disengaged when
the BYPASS pin is HIGH. No equalization occurs in Bypass
mode.
The GS2964 is footprint and drop-in compatible with
existing GS2974 designs, with no additional application
changes required.
Pb-free and RoHS compliant
Applications
•
The GS2964 features DC restoration to compensate for the
DC content of SMPTE pathological test patterns.
The differential outputs can be DC-coupled to Gennum
3.3V cable drivers and reclockers and to other
industry-standard 3.3V CML logic.
Š Drop-in compatible with the GS2974
•
The device is designed to support SMPTE 424M,
SMPTE292M and SMPTE 259M, and is optimized for
performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s.
SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial
cable serial digital interfaces
The device is available in a 16-pin, 4mm x 4mm QFN
package.
Power consumption of the GS2964 is typically 215mW.
The GS2964 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
www.gennum.com
1 of 17
SQ_ADJ
BYPASS
MUTE
CD
Squelch Adjust
Carrier Detect
Mute
SDI
SDI
Equalizer
DC
Restore
Output
SDO
SDO
AGC
AGC AGC
GS2964 Functional Block Diagram
Revision History
Version
ECR
PCN
Date
3
153913
54547
March 2010
Changed ESD rating from 6kV to
5kV in Section 2.1 Absolute
Maximum Ratings.
2
152613
–
September
2009
Updates to Output Voltage Swing
specifications in Table 2-2: AC
Electrical Characteristics.
1
152312
–
July 2009
Converted to Data Sheet.
0
151929
–
May 2009
Conversion to Preliminary Data
Sheet.
B
151798
–
April 2009
Updates.
A
151181
–
January 2009
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
Changes and/or Modifications
New document.
2 of 17
Contents
Key Features........................................................................................................................................................1
Applications.........................................................................................................................................................1
Description...........................................................................................................................................................1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 GS2964 Pin Assignment .................................................................................................................4
1.2 GS2964 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
2.4 Typical Performance Curves ........................................................................................................8
3. Input/Output Circuits ..................................................................................................................................9
4. Detailed Description.................................................................................................................................. 10
4.1 Serial Digital Inputs ...................................................................................................................... 10
4.2 Cable Equalization ........................................................................................................................ 10
4.3 Serial Digital Outputs ................................................................................................................... 10
4.4 Programmable Squelch Adjust (SQ_ADJ) .............................................................................. 11
4.5 Mute and Carrier Detect .............................................................................................................. 11
4.6 Output Rise/Fall Times ................................................................................................................ 12
5. Application Information .......................................................................................................................... 13
5.1 PCB Layout ....................................................................................................................................... 13
5.2 Typical Application Circuit ........................................................................................................ 13
6. Package & Ordering Information .......................................................................................................... 14
6.1 Package Dimensions ..................................................................................................................... 14
6.2 Packaging Data ............................................................................................................................... 14
6.3 Recommended PCB Footprint ................................................................................................... 15
6.4 Marking Diagram ........................................................................................................................... 15
6.5 Solder Reflow Profiles .................................................................................................................. 16
6.6 Ordering Information ................................................................................................................... 16
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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1. Pin Out
2
SDI
3
N/C
4
MUTE
13
GS2964
16-pin QFN
(top view)
12
VEE_D
11
SDO
10
SDO
9
AGC
5
Ground Pad
(bottom of package)
VCC_D
CD
14
6
7
N/C
8
SQ_ADJ
SDI
15
BYPASS
1
16
AGC
VEE_A
VCC_A
1.1 GS2964 Pin Assignment
Figure 1-1: GS2964 Pin Out
1.2 GS2964 Pin Descriptions
Table 1-1: GS2964 Pin Descriptions
Pin Number
Name
Timing
Type
1
VEE_A
Analog
Power
Description
Most negative power supply for analog circuitry.
Connect to GND.
2, 3
SDI, SDI
Analog
Input
4, 9
N/C
–
–
No Connect. Not bonded internally.
5, 6
AGC, AGC
Analog
–
External AGC capacitor.
Serial digital differential input.
Connect pin 5 and pin 6 together as shown in the Typical
Application Circuit on page 13.
7
BYPASS
Not
Synchronous
Input
Forces the Equalizing and DC RESTORE stages into bypass mode
when HIGH. No equalization occurs in this mode. (Internal
pull-down).
8
SQ_ADJ
Analog
Input
Squelch Adjust.
Adjusts the approximate amount of cable equalized before CD goes
low. See Section 4.4 and Section 4.5. (Internal pull-down).
10, 11
SDO, SDO
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
Analog
Output
Equalized serial digital differential output.
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Table 1-1: GS2964 Pin Descriptions (Continued)
Pin Number
Name
Timing
Type
Description
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)
Controls output behaviour on SDO and SDO. (Internal pull-down).
See Section 4.5.
15
CD
Not
Synchronous
Output
STATUS SIGNAL OUTPUT
Signal levels are LVCMOS/LVTTL compatible.
Indicates the presence of an input signal.
See Section 4.5.
16
VCC_A
Analog
Power
Most positive power supply for the analog circuitry of the device.
Connect to +3.3V DC.
–
Center Pad
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
–
Power
Internally bonded to VEE_A.
5 of 17
2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Parameter
Value
Supply Voltage
-0.5V to +3.6V DC
Input ESD Voltage (HBM)
5kV
Storage Temperature Range
-50°C < Ts < 125°C
Input Voltage Range (any input)
-0.3 to (VCC +0.3)V
Operating Temperature Range
-40°C to +85°C
Solder Reflow Temperature
260°C
2.2 DC Electrical Characteristics
Table 2-1: DC Electrical Characteristics
VCC = 3.3V ±5%,
TA = -40°C to +85°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
–
Supply Current
Is
TA = 25°C
–
65
–
mA
–
VCMOUT
TA = 25°C
–
VCC - ΔVSDO/2
–
V
–
Input Common Mode Voltage
VCMIN
TA = 25°C
–
2.2
–
V
–
SQ_ADJ DC Voltage (to mute
signal)
–
0m, TA = 25°C
–
3.2
–
V
–
SQ_ADJ Range
–
TA = 25°C
–
1
–
V
–
2.4
–
–
V
–
–
–
0.4
V
–
2.0
–
–
V
–
–
–
0.8
V
–
Output Common Mode
Voltage
CD Output Voltage
VCD(OH)
Carrier not
present
VCD(OL)
Carrier present
Mute Input Voltage Required
to Force Outputs to Mute
VMute
Min to Mute
Mute Input Voltage Required
to Force Outputs Active
VMute
Max to
Activate
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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2.3 AC Electrical Characteristics
Table 2-2: AC Electrical Characteristics
VCC = 3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Notes
Serial input data rate
DRSDO
–
143
–
2970
Mb/s
–
Input Voltage Swing
ΔVSDI
TA =25°C, differential,
270Mb/s and 1.485Gb/s
720
800
950
mVp-p
1
TA =25°C, differential,
2.97Gb/s
720
800
880
mVp-p
1
100Ω load, TA =25°C,
differential
650
800
950
mVp-p
–
Output Voltage Swing
Output Jitter of Various
Cable Lengths and Data
Rates
Output Rise/Fall time
ΔVSDO
–
270Mb/s
Belden 1694A: 0-180m
–
0.2
−
UI
2
–
1.485Gb/s
Belden 1694A: 0-140m
–
0.25
−
UI
2
–
2.97Gb/s
Belden 1694A: 0-100m
–
0.35
−
UI
2
–
2.97Gb/s & 1.485Gb/s
20% - 80%
35
65
90
ps
–
270Mb/s (see Section 4.6)
Mismatch in rise/fall time
–
–
–
30
–
ps
–
Duty cycle distortion
–
–
–
–
30
ps
–
Overshoot
–
–
–
–
10
%
–
Input Return Loss
–
–
15
–
–
dB
3
Input Resistance
–
single ended
–
1.7
–
kΩ
–
Input Capacitance
–
single ended
–
1
–
pF
–
Output Resistance
–
single ended
–
50
–
Ω
–
NOTES:
1. 0m cable length.
2. 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.
3. Tested on GS2964 board from 5MHz to 3GHz.
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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2.4 Typical Performance Curves
VCC=3.3V, room temperature, 800mV launch swing
Pk-Pk Jitter (ps)
500
400
300
200
100
0
0
20
40
60
80
100
120
Cable Length (m)
140
160
180
Pk-Pk Jitter (ps)
Figure 2-1: Jitter vs. Cable Length (270Mb/s)
100
0
0
20
40
60
80
Cable Length (m)
100
120
140
Pk-Pk Jitter (ps)
Figure 2-2: Jitter vs. Cable Length (1485Mb/s)
100
0
20
40
60
80
Cable Length (m)
100
120
Figure 2-3: Jitter vs. Cable Length (2970Mb/s)
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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3. Input/Output Circuits
4k
4k
SDI
SDI
-
8k
R
8k
+
SQ_ADJ
82.4k
Figure 3-1: Input Equivalent Circuit
50
Figure 3-2: SQ_ADJ Equivalent Circuit
50
SDO
SDO
Figure 3-3: Output Circuit
MUTE,
BYPASS
Figure 3-4: MUTE and BYPASS Circuits
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
CD
Figure 3-5: CD Circuit
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4. Detailed Description
The GS2964 is a high-speed BiCMOS IC designed to equalize serial digital signals.
The GS2964 can equalize 3Gb/s, HD and SD serial digital signals, and will typically
equalize 100m of Belden 1694A cable at 2.97Gb/s, 140m at 1.485Gb/s and 180m at
270Mb/s.The GS2964 is powered from a single +3.3V power supply and consumes
approximately 215mW of power.
4.1 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.
4.2 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.
4.3 Serial Digital Outputs
The digital output signals have a nominal voltage of 800mVpp differential, or 400mVpp
single-ended when terminated with 50Ω as shown in Figure 4-1.
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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+200mV
VCM = 2.9V
typical
SDO
-200mV
SDO
+200mV
50
50
VCM = 2.9V
typical
-200mV
Figure 4-1: Typical Output Voltage Levels
4.4 Programmable Squelch Adjust (SQ_ADJ)
The GS2964 incorporates a programmable Squelch Adjust (SQ_ADJ) threshold.
This feature can be useful in applications where there are multiple input channels using
the GS2964 and the maximum gain can be limited to avoid crosstalk.
The SQ_ADJ pin acts to change the threshold of the Carrier Detect (CD) pin, through
voltage level variances. When the input signal drops below a certain threshold, the CD
pin will be driven high, indicating that there is not a valid input signal. In order to enable
automatic muting of the output of the GS2964, the CD pin should be connected directly
to the MUTE pin. In applications where programmable squelch adjust is not required, the
SQ_ADJ pin may be left unconnected.
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.
4.5 Mute and Carrier Detect
The GS2964 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 GS2964. 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 1: 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 GS2964 when no valid input signal has been detected.
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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NOTE 2: If the maximum cable length is exceeded (set by the SQ_ADJ pin) and the
device is not in Bypass mode, the CD pin will not be driven low, even if a carrier is
present.
Table 4-1: Mute Input Table
Mute
Function
0
SDO and SDO operate normally
1
SDO and SDO are forced to a steady
state (either high or low)
Table 4-2: CD Output Table
CD
Input Status
0
Valid Input on SDI, SDI pins
1
Input is not valid
4.6 Output Rise/Fall Times
180
160
Rise/Fall
Time (ps)
140
120
100
80
60
40
0
10 20 30 40 50 60 70 80 90 100 110
Cable Length (m)
130
150
170
Figure 4-2: Typical Rise/Fall time for 270Mb/s data rate (VCC=3.3V, room
temperature, 800mV launch swing)
The GS2964 was designed to limit bandwidth as cable length is increased. During 3G
(2.97Gb/s) and HD (1.485Gb/s) operation, the impact of this is minimal on rise and fall
time over the operating range. For SD (270Mb/s), the bandwidth limitation becomes
more significant, particularly at longer cable lengths where a reduction in rise and fall
time is observed. This means that for SD (270Mb/s) operation, rise and fall times slow as
shown in Figure 4-2 above. This is beneficial because at 270Mb/s, one unit interval is
equal to 3.7ns, therefore rise and fall times less than 100ps are not required, and slower
rise and fall times actually help to reduce EMI.
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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5. Application Information
5.1 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 3Gb/s 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 GS2964 input components to minimize
parasitic capacitance.
•
The PCB ground plane is removed under the GS2964 output components to
minimize parasitic capacitance.
•
High speed traces are curved to minimize impedance changes.
5.2 Typical Application Circuit
CD
MUTE
VCC
VCC
1u
2
CD
13
VCC_D
1
MUTE
6.2n*
14
15
10n
VEE_D
VEE_A
SDI
SDO
75
12
4u7
+
SDO
+
SDO
11
GS2964
SDO
NC
6
5
7
SQ_ADJ
37R4
4
SDI
AGC
75
3
BYPASS
1u
AGC
SDI
VCC_A
16
10n
NC
10
9
4u7
8
SQ_ADJ
470n
470n
BYPASS
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
* Value dependent on layout
Figure 5-1: GS2964 Typical Application Circuit
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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6. Package & Ordering Information
6.1 Package Dimensions
2.76+/-0.10
PIN #1
IDENTIFICATION
Φ0.4500
DATUM A
PIN 1 AREA
2X
0.40+/-0.05
4.00+/-0.05
B
CENTER TAB
2.76+/-0.10
A
4.00+/-0.05
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
0.65/2
0.00-0.05
0.85+/-0.05
TERMINAL TIP
0.65
DETAIL B
SCALE:NTS
6.2 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, ψ
11.0°C/W
Pb-free and RoHS compliant
Yes
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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6.3 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.
6.4 Marking Diagram
Pin 1 ID
GS2964
XXXXE3
YYWW
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
XXXX - Last 4 digits (excluding decimal)
of SAP Batch Assembly (FIN) as listed
on Packing Slip.
E3 - Pb-free & Green indicator
YYWW - Date Code
15 of 17
6.5 Solder Reflow Profiles
The GS2964 is available in a Pb-free package. It is recommended that the Pb-free
package be soldered with Pb-free paste using the reflow profile shown in Figure 6-1.
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 6-1: Maximum Pb-free Solder Reflow Profile
6.6 Ordering Information
Part Number
Package
Temperature Range
GS2964
GS2964-INE3
16-pin QFN
-40°C to 85°C
GS2964
GS2964-INTE3
16-pin QFN Tape &
Reel (250pcs)
-40°C to 85°C
GS2964
GS2964-INTE3Z
16-pin QFN Tape &
Reel (2500pcs)
-40°C to 85°C
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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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
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4281 Harvester Road
Burlington, Ontario L7L 5M4
Canada
Phone: +1 (905) 632-2996
Fax: +1 (905) 632-2055
E-mail: [email protected]
Web Site: http://www.gennum.co.jp
Phone: (886) 2-8732-8879
Fax: (886) 2-8732-8870
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 2009 Gennum Corporation. All rights reserved.
www.gennum.com
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
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