GS2986 Datasheet PDF - Gennum

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GS2986
Gennum

Part Number GS2986
Description Multi-Rate SDI Reclocker
Page 30 Pages


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GS2986 Multi-Rate SDI Reclocker with Equalization & De-emphasis
Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M-C compliant
• Supports DVB-ASI at 270Mb/s
• Single supply operation at 3.3V or 2.5V
• 180mW typical power consumption (213mW with RCO
enabled) at 2.5V
• Input signal equalization and output-signal de-emphasis
settings to compensate for board-trace dielectric losses
• 4:1 input multiplexer patented technology
• Choice of dual reclocked data outputs or one reclocked data
output and one clock output
• Uses standard 27MHz crystal
• Cascadable crystal buffer supports multiple reclockers using
a single crystal
• Differential inputs and outputs
Š support DC coupling to industry-standard differential
logic
Š on-chip 100Ω differential data input/output termination
Š selectable 400mVppd or 800mVppd output swing on
each output
Š seamless interface to other Gennum products
• 4 wire SPI host interface for device configuration and
monitoring
Standard logic control and status signal levels
• Auto and Manual modes for rate selection
• Standards indication in Auto mode
• Lock Detect Output
• Mute, Bypass and Autobypass functions
• SD/HD indication output to control GS2978 or GS2988 dual
slew-rate cable drivers
• Operating temperature range: -40°C to +85°C
• Small footprint QFN package (6mm x 6mm)
• Pb-free and RoHS compliant
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M-C coaxial
cable serial digital interfaces
Description
The GS2986 is a multi-rate serial digital reclocker designed to
automatically recover the embedded clock from a digital video
signal and retime the incoming video data. It will recover the
embedded clock signal and retime the data from a SMPTE 424M,
SMPTE 292M, or SMPTE 259M-C compliant digital video signal.
A serial host interface provides the ability to configure and
monitor multiple GS2986 devices in a daisy-chain configuration.
Adjustable input trace equalization (EQ) for up to 40” of FR4 trace
losses, and adjustable output de-emphasis (DE) for up to 20” of
FR4 trace losses, can be configured via the host interface.
The GS2986 can operate in either auto or manual rate selection
mode. In Auto mode, the device will automatically detect and lock
onto incoming SMPTE SDI data signals at any supported rate. For
single rate data systems, the GS2986 can be configured to operate
in Manual mode. In both modes, the device requires only one
external crystal to set the VCO frequency when not locked and
provides adjustment free operation.
The GS2986 accepts industry-standard differential input levels
including LVPECL and CML. The differential data and clock
outputs feature selectable output swing via the host interface,
ensuring compatibility with most industry-standard, terminated
differential receivers.
The GS2986 features dual differential outputs. The second output
can be configured to emit either the recovered clock signal or the
re-timed video data. This output can also be disabled to save
power.
In systems which require passing of non-SMPTE data rates, the
GS2986 can be configured to either automatically or manually
enter a bypass mode in order to pass the signal without reclocking.
The GS2986 is Pb-free, and the encapsulation compound does not
contain halogenated flame retardant. This component and all
homogeneous sub-components are RoHS compliant.
GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 1
March 2010
www.gennum.com
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XTAL-
XTAL+
XTAL_BUF_OUT
XTAL
OSC
Buffer
DDI0
DDI0
DDI1
DDI1
DDI2
DDI2
DDI3
DDI3
Equalizer/
Data Mux
Phase
Frequency
Detector
Phase
Detector
Selectable
Divide
CP_CAP
LF+
LDO
Retimer
Charge
Pump
VCO
Selectable
Divide
LOS
Detect
SPI
Control
DDI_SEL[1:0] LOS
Revision History
LOCKED
SD/HD
GS2986 Functional Block Diagram
Data
Buffer
Clock/
Data
Buffer
DDO0
DDO0
DDO1/RCO
DDO1/RCO
1.8V
LDO
DDO1_DISABLE
VDD_1p8
Version
1
ECR
153705
PCN
0
152591
B
151972
A
151668
Date
March 2010
September
2009
July 2009
April 2009
Changes and/or Modifications
Converted to Data Sheet. Updated
Power numbers in Table 2-1: DC
Electrical Characteristics. Added Table
4-5: Suggested LOS Threshold Settings.
Converted to Preliminary Data Sheet.
Updates to Electrical Characteristics.
Updates to Section 4.15 Host Interface.
Added Section 4.15 Host Interface.
Updated Power numbers in Table 2-1:
DC Electrical Characteristics and Loop
Bandwidth numbers in Table 2-2: AC
Electrical Characteristics. Added Table
1-2: GS2986 Default Start-up Settings
and Figure 4-2: De-emphasis
Waveform.
New document.
GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 1
March 2010
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Contents
Features ................................................................................................................................................................. 1
Applications.........................................................................................................................................................1
Description ........................................................................................................................................................... 1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................5
1.1 Pin Assignment ..................................................................................................................................5
1.2 Pin Descriptions ................................................................................................................................6
1.3 Default Start-up Settings ................................................................................................................8
2. Electrical Characteristics ............................................................................................................................9
2.1 Absolute Maximum Ratings ..........................................................................................................9
2.2 DC Electrical Characteristics ........................................................................................................9
2.3 AC Electrical Characteristics ..................................................................................................... 10
3. Input/Output Circuits ............................................................................................................................... 13
4. Detailed Description.................................................................................................................................. 17
4.1 Serial Data Input ............................................................................................................................ 17
4.2 Modes of Operation ...................................................................................................................... 17
4.3 Input Trace Equalization ............................................................................................................. 17
4.4 4:1 Input Mux .................................................................................................................................. 18
4.5 Crystal Buffer .................................................................................................................................. 19
4.6 LOS (Loss Of Signal) Detection .................................................................................................. 19
4.7 Serial Digital Reclocker ............................................................................................................... 20
4.8 Lock Detection ................................................................................................................................ 20
4.8.1 Lock Detect and Asynchronous Lock ......................................................................... 21
4.9 Serial Data Output ......................................................................................................................... 21
4.9.1 Output Signal Interface Levels...................................................................................... 21
4.9.2 Adjustable Output Swing................................................................................................ 21
4.9.3 Output De-emphasis ........................................................................................................ 21
4.10 Automatic and Manual Data Rate Selection ...................................................................... 22
4.11 SD/HD Indication ........................................................................................................................ 23
4.12 Bypass Mode ................................................................................................................................. 23
4.13 DVB-ASI ......................................................................................................................................... 24
4.14 Output Mute and Data/Clock Output Selection ............................................................... 24
4.15 Host Interface ............................................................................................................................... 24
4.15.1 Introduction ...................................................................................................................... 24
4.15.2 Legacy Mode & Start-up................................................................................................ 25
4.15.3 Host Interface Mode & Start-up.................................................................................. 25
4.15.4 Clock & Data Timing....................................................................................................... 25
4.15.5 Single Device Operation............................................................................................... 25
4.15.6 Write Operation - Single Device ................................................................................ 26
4.15.7 Read Operation - Single Device ................................................................................. 27
4.15.8 Daisy Chain Operation.................................................................................................. 29
4.15.9 Read & Write Operation - Daisy Chained Devices .............................................. 30
GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 1
March 2010
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4.15.10 Writing to all Devices .................................................................................................. 30
4.15.11 Writing to a Single Device in the Chain ................................................................ 31
4.15.12 Reading from all Devices ........................................................................................... 31
4.15.13 Reading from a Single Device in the Chain.......................................................... 32
4.15.14 Host Register Map......................................................................................................... 33
4.16 Device Power-up ......................................................................................................................... 36
4.17 Standby ........................................................................................................................................... 36
5. Typical Application Circuit ..................................................................................................................... 37
6. Package and Ordering Information...................................................................................................... 38
6.1 Package Dimensions ..................................................................................................................... 38
6.2 Recommended PCB Footprint ................................................................................................... 39
6.3 Packaging Data ............................................................................................................................... 39
6.4 Marking Diagram ........................................................................................................................... 40
6.5 Solder Reflow Profile .................................................................................................................... 40
6.6 Ordering Information ................................................................................................................... 41
GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 1
March 2010
4 of 41
Free Datasheet http://www.datasheet4u.com/



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