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PDF GS2985 Data sheet ( Hoja de datos )
| Número de pieza | GS2985 | |
| Descripción | Multi-Rate SDI Reclocker | |
| Fabricantes | Semtech | |
| Logotipo |  |
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GS2985
GS2985 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 (210mW 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
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
• 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)
Package-compatible with GS2975A
• Pb-free and RoHS compliant
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M-C coaxial
cable serial digital interfaces
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.
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
36663 - 5
July 2012
www.semtech.com
1 of 45
Proprietary & Confidential
1 page  
4.15.11 Writing to a Single Device in the Chain ................................................................ 33
4.15.12 Reading from all Devices ........................................................................................... 33
4.15.13 Reading from a Single Device in the Chain.......................................................... 34
4.15.14 Host Register Map......................................................................................................... 35
4.16 Device Power-up ......................................................................................................................... 39
4.17 Standby ........................................................................................................................................... 39
5. Typical Application Circuit ..................................................................................................................... 40
6. Package and Ordering Information...................................................................................................... 41
6.1 Package Dimensions ..................................................................................................................... 41
6.2 Recommended PCB Footprint ................................................................................................... 42
6.3 Packaging Data ............................................................................................................................... 42
6.4 Marking Diagram ........................................................................................................................... 43
6.5 Solder Reflow Profile .................................................................................................................... 43
6.6 Ordering Information ................................................................................................................... 44
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
36663 - 5
July 2012
5 of 45
Proprietary & Confidential
5 Page 
Table 2-1: DC Electrical Characteristics (Continued)
Parameter
VIH (2.5V operation)
Symbol
Conditions
− VOUT≥VOH, min
VIH (3.3V operation)
VOUT≥VOH, min
IIN
VOL (2.5V operation)
VOL (3.3V operation)
VOH (2.5V operation)
VOH (3.3V operation)
− VIN = 0V or VIN = VDD
− VDD = min, IOL = 100μA
VDD = min, IOL = 100μA
− VDD = min, IOH = -100μA
VDD = min, IOH = -100μA
Hysteresis Voltage (SPI inputs)
− 2.5V operation
3.3V operation
2.3 AC Electrical Characteristics
Min
1.7
2
−
−
−
2.1
VDD
-0.4
−
−
Typ
−
−
+/-10
−
−
−
−
350
420
Max
VDD
+0.3
VDD
+0.3
+/-20
0.4
0.4
−
−
Units
V
V
μA
V
V
V
V
− mV
− mV
Table 2-2: AC Electrical Characteristics
Parameter
Serial Input Data Rate
(for reclocking)
Serial Input Data Rate
(bypass)
SPI Operating Speed
Input Voltage Swing
Symbol
DRSDO
−
ΔVSDI
Output Voltage Swing
ΔVOD
Input Trace Equalization
−
Conditions
−
−
−
set ATTEN_EN = 1 for
ΔVSDI>1Vpp
default
see DRIVER_1 register
(0x01) addresses 8 & 9 in
4.15.14 Host Register
Map.
LOW
MED
HIGH
Min Typ Max Units Notes
0.27 − 2.97 Gb/s −
DC
− 2.97 Gb/s
−
−
−
10 MHz
−
100
2000 mVp-pd
−
300 400 500 mVp-pd −
600 800 1000 mVp-pd −
Recommended setting for 0 to 10
inches of FR4
Recommended setting for 10 to 20
inches of FR4
Recommended setting for >20 inches
of FR4
−
−
−
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
36663 - 5
July 2012
11 of 45
Proprietary & Confidential
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet GS2985.PDF ] | |
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