GS2974A Datasheet PDF - Gennum

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GS2974A
Gennum

Part Number GS2974A
Description HD-LINX III Adaptive Cable Equalizer
Page 16 Pages


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GS2974A HD-LINX™ III Adaptive Cable Equalizer
Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M
compliant
• Automatic cable equalization
• 0.3UI Maximum Output Jitter at 2.97Gb/s
• 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: 120m
at 2.97Gb/s, 200m at 1.485Gb/s, and 350m 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
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces.
Description
The GS2974A is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
co-axial cable.
The GS2974A 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 GS2974A 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 GS2974A output when an approximate
selected cable length is reached for SMPTE 259M signals.
This feature allows the GS2974A to distinguish between
low amplitude SD-SDI signals and noise at the input of the
device. The serial digital outputs of the GS2974A 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 GS2974A is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
MCLADJ
SDI
SDI
CABLE LENGTH ADJUSTOR
CARRIER
DETECT MUTE
EQUALIZER
DC RESTORE
OUTPUT
AGC
GS2974A Functional Block Diagram
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
www.gennum.com
CD
MUTE
BYPASS
SDO
SDO
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Revision History
Version ECR
PCN Date
Changes and/or Modifications
3
151331 –
January 2009
Added 2500pc reel size to 6.6 Ordering
Information. Changed the Output Voltage
Swing from 550mVp-p to 600mVp-p in
Table 2-2: AC Electrical Characteristics.
2 149719 – April 2008
Added “0.3UI Maximum Output Jitter at
2.97Gb/s” to Features Section and Table
2-2: AC Electrical Characteristics. Changed
cables lengths from 100 to 120 and 400 to
350 in Section 4. Detailed Description.
Re-wrote Section 4.3 Programmable
Maximum Cable Length Adjust (MCLADJ).
Added Tape & Reel to 6.6 Ordering
Information.
1 145131 – May 2007
Converted to Data Sheet.
0 144247 – February 2007 Converted to Preliminary Data Sheet.
Removed ‘Proprietary and Confidential’
footer. Modified DC Electrical
Characteristics and AC Electrical
Characteristics table. Added section 6.4
Marking Diagram.
A 143102 – December 2006 New Document.
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
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Contents
Features ................................................................................................................................................................. 1
Applications ......................................................................................................................................................... 1
Description ........................................................................................................................................................... 1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 GS2974A Pin Assignment ..............................................................................................................4
1.2 GS2974A 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 PCB Layout ....................................................................................................................................... 12
5.2 Typical Application Circuit ........................................................................................................ 12
6. Package & Ordering Information .......................................................................................................... 13
6.1 Package Dimensions ..................................................................................................................... 13
6.2 Packaging Data ............................................................................................................................... 13
6.3 Recommended PCB Footprint ................................................................................................... 14
6.4 Marking Diagram ........................................................................................................................... 14
6.5 Solder Reflow Profiles .................................................................................................................. 15
6.6 Ordering Information ................................................................................................................... 15
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
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1. Pin Out
1.1 GS2974A Pin Assignment
16
VEE_A 1
15 14
13
12 VEE_D
SDI 2
SDI 3
GS2974A
(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 GS2974A Pin Descriptions
Table 1-1: GS2974A 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 12.
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.
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
4 of 16
Free Datasheet http://www.datasheet4u.com/



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