gs2985 Gennum Corporation, gs2985 Datasheet
gs2985
Manufacturer Part Number
gs2985
Description
Multi-rate Sdi Reclocker With Equalization & De-emphasis
Manufacturer
Gennum Corporation
Datasheet
1.GS2985.pdf
(3 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
GS2985 Multi-Rate SDI Reclocker with Equalization & De-emphasis
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Applications
•
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Product Brief
50870 - C
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
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 (9mm x 9mm)
Pb-free and RoHS compliant
SMPTE 424M, SMPTE 292M and SMPTE 259M-C coaxial
cable serial digital interfaces
support DC coupling to industry-standard differential
logic
on-chip 100Ω differential data input/output termination
selectable 400mVppd or 800mVppd output swing on
each output
seamless interface to other Gennum products
Package-compatible with GS2975A
June 2009
www.gennum.com
Description
The GS2985 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 GS2985 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 GS2985 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 GS2985 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 GS2985 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 GS2985 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
GS2985 can be configured to either automatically or manually
enter a bypass mode in order to pass the signal without reclocking.
The GS2985 is Pb-free, and the encapsulation compound does not
contain halogenated flame retardant. This component and all
homogeneous sub-components are RoHS compliant.
1 of 3
Related parts for gs2985
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Wideband, monolithic 1x1 video crosspoint switch
Manufacturer:
Gennum Corporation
Datasheet:
Part Number:
Description:
Wideband, Monolithic 4x1 Video Multiplexer
Manufacturer:
Gennum Corporation
Datasheet:
Part Number:
Description:
Monolithic 4x1 Video Multiplexer
Manufacturer:
Gennum Corporation
Datasheet:
Part Number:
Description:
Low Distortion AGC Amplifier
Manufacturer:
Gennum Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Gennum Corporation
Datasheet:
gs2985 Summary of contents
Page 1
... 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 GS2985 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 ...
Page 2
... DDI1 GND 8 DDI2 9 N DDI2 GND 12 DDI3 13 RSVD 14 DDI3 15 GND 16 Ground Pad (bottom of package) GS2985 Multi-Rate SDI Reclocker with Equalization & De-emphasis Product Brief 50870 - C June 2009 CP_CAP LF+ KBB Buffer LDO Retimer Charge VCO Pump Selectable Divide Control AUTO/MAN LOCKED BYPASS SS[1:0] ...
Page 3
... All other trademarks mentioned are the properties of their respective owners. GENNUM and the Gennum logo are registered trademarks of Gennum Corporation. © Copyright 2008 Gennum Corporation. All rights reserved. www.gennum.com GS2985 Multi-Rate SDI Reclocker with Equalization & De-emphasis Product Brief 50870 - C June 2009 ...