GS2974B Datasheet PDF - Gennum

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GS2974B
Gennum

Part Number GS2974B
Description HD-LINX III Adaptive Cable Equalizer
Page 17 Pages


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GS2974B HD-LINX™ III Adaptive Cable Equalizer
Features
• SMPTE 424M, SMPTE 292M, 344M and SMPTE 259M
compliant
• Automatic cable equalization
• Multi-standard operation from 143Mb/s to 2.97Gb/s
• 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 1.485Gb/s and 2.97Gb/s
• Typical equalized length of Belden 1694A cable: 140m
at 2.97Gb/s, 230m at 1.485Gb/s, and 250m at 270Mb/s
• 50Ω differential output (internal 50Ω pull-ups)
• Programmable mute based on max cable length adjust
• Single 3.3V power supply operation
• Operating temperature range: 0°C to +70°C
• Footprint compatible with GS2974A and GS1574A
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces.
Description
The GS2974B is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
co-axial cable.
The GS2974B is designed to support SMPTE 424M, SMPTE
292M and SMPTE 259M, and is optimized for performance
at 1.485Gb/s and 2.97Gb/s.
The GS2974B features DC restoration to compensate for the
DC content of SMPTE pathological test patterns.
A voltage programmable mute threshold (MCLADJ),
applicable for SD mode (refer to Section 4.3), is included to
allow muting of the GS2974B output when an approximate
selected cable length is reached for SMPTE 259M signals.
This feature allows the GS2974B to distinguish between
low amplitude SD-SDI signals and noise at the input of the
device. The serial digital outputs of the GS2974B 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 GS2974B is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
MCLADJ
CABLE LENGTH ADJUSTOR
CARRIER DETECT
MUTE
SDI EQUALIZER
SDI
DC RESTORE
OUTPUT
AGC
GS2974B Functional Block Diagram
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
www.gennum.com
CD
MUTE
BYPASS
SDO
SDO
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Revision History
Version ECR
PCN Date
Changes and/or Modifications
3
151788
April 2009
Corrected 250pc part number in 6.6 Ordering
Information.
2
151333
January 2009 Added 2500pc reel size to 6.6 Ordering
Information. Added the maximum power
consumption in Table 2-1: DC Electrical
Characteristics. Changed the Output Voltage
Swing from 550mVp-p to 600mVp-p in Table
2-2: AC Electrical Characteristics.
1
149533
April 2008
Converted to Data Sheet. Updated document
format. Re-wrote section 4.3 Programmable
Maximum Cable Length Adjust (MCLADJ).
Added Tape and Reel to 6.6 Ordering
Information.
0
148227
– November
Converted to Preliminary Data Sheet.
2007
Changed Input ESD Voltage to 4kV in 2.1
Absolute Maximum Ratings. Replaced 5.3
Typical Application Circuit.
B
146732
– August 2007 Addition of High Gain Adaptive Cable
Equalizers on page 12, and removal of Typical
Application Circuit on page 13.
A
145689
July 2007
New document.
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
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Contents
Features ................................................................................................................................................................. 1
Applications ......................................................................................................................................................... 1
Description ........................................................................................................................................................... 1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 GS2974B Pin Assignment ...............................................................................................................4
1.2 GS2974B 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
Test Circuit ...........................................................................................................................................................8
3. Input/Output Circuits ..................................................................................................................................8
4. Detailed Description.....................................................................................................................................9
4.1 Serial Digital Inputs .........................................................................................................................9
4.2 Cable Equalization ........................................................................................................................ 10
4.3 Programmable Maximum Cable Length Adjust (MCLADJ) ............................................. 10
4.4 Mute and Carrier Detect .............................................................................................................. 11
5. Application Information .......................................................................................................................... 12
5.1 High Gain Adaptive Cable Equalizers .................................................................................... 12
5.2 PCB Layout ....................................................................................................................................... 12
5.3 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
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
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1. Pin Out
1.1 GS2974B Pin Assignment
16
VEE_A 1
15 14
13
12 VEE_D
SDI 2
SDI 3
GS2974B
(top view)
11 SDO
10 SDO
VEE_A
4
5
67
9 VEE_D
8
Center Pad
(bottom of package, internally
bonded to VEE_A)
Figure 1-1: 16-Pin QFN
1.2 GS2974B Pin Descriptions
Table 1-1: GS2974B Pin Descriptions
Pin Number
1, 4
Name
VEE_A
Timing
Analog
2, 3
SDI, SDI
Analog
5, 6
AGC, AGC
Analog
7
BYPASS
Not
Synchronous
8
MCLADJ
Analog
9
VEE_D
Analog
Type
Power
Input
Input
Input
Power
Description
Most negative power supply for analog circuitry.
Connect to GND.
Serial digital differential input.
External AGC capacitor.
Connect pin 5 and pin 6 together as shown in the Typical
Application Circuit on page 13.
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. See Section 4.3. and Section 4.4
Most negative power supply for the digital circuitry and output
buffer.
Connect to GND.
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
4 of 17
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