GS2975A Datasheet PDF - Gennum

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GS2975A
Gennum

Part Number GS2975A
Description Multi-Rate SDI Automatic Reclocker
Page 27 Pages


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GS2975A HD-LINX® III Multi-Rate SDI Automatic Reclocker with Dual
Differential Outputs
Features
• SMPTE 424M, 292M, and 259M-C compliant
• Supports data rates of 270, 1483.5, 1485, 2967,
2970Mb/s
• Supports DVB-ASI at 270Mb/s
• Pb-free and RoHS Compliant
• Auto and Manual Modes for rate selection
• Standards indication in Auto Mode
• 4:1 input multiplexer patented technology
• Choice of dual reclocked data outputs or one data
output and one recovered clock output
• Footprint and drop-in compatible with existing
GS2975 designs
• Loss of Signal (LOS) Output
• Lock Detect Output
• On-chip Input and Output Termination
• Differential 50Ω inputs and outputs
• Mute, Bypass and Autobypass functions
• SD/HD indication output to control GS2978 Dual
Slew-Rate Cable Driver
• Single 3.3V power supply
• Operating temperature range: 0°C to 70°C
Description
The GS2975A is a Multi-Rate Serial Digital Reclocker
designed to automatically recover the embedded clock
from a digital video signal and re-time the incoming video
data.
The GS2975A Serial Digital Reclocker will recover the
embedded clock signal and re-time the data from a SMPTE
424M, SMPTE 292M, or SMPTE 259M-C compliant digital
video signal.
The GS2975A removes the high frequency jitter
components from the bit-serial stream. Input termination is
on-chip for seamless matching to 50Ω transmission lines.
The GS2975A 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
GS2975A 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.
In systems which require passing of non-SMPTE data rates,
the GS2975A can be configured to either automatically or
manually enter a bypass mode in order to pass the signal
without reclocking.
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M-C Serial
Digital Interfaces
The GS2975A offers a choice of dual reclocked data outputs
or one data output and one recovered clock output. The
device is footprint and drop-in compatible with existing
GS2975 designs, with no additional application changes
required.
The GS2975A is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous sub-components are
RoHS compliant.
GS2975A HD-LINX® III Multi-Rate SDI Automatic
Reclocker with Dual Differential Outputs
Data Sheet
41487 - 4
April 2009
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Functional Block Diagram
XTAL+ XTAL-
XTAL XTAL
OUT+ OUT-
LF+ LF- KBB
XTAL
OSC
BUFFER
DDI 0
DDI 1
DDI 2
DDI 3
D
A
T
A
M
U
X
DDI_SEL[1:0]
PHASE
FREQUENCY
DETECTOR
PHASE
DETECTOR
M
U
X
DIVIDER
CONTROL LOGIC
CHARGE
PUMP
RE-TIMER
M
U
X
VCO
DIVIDER
DATA BUFFER
M
U CLOCK BUFFER
X
DDO 0
DDO_MUTE
RCO_MUTE
RCO/DDO1
DATA/CLOCK
BYPASS
LOGIC
SS[2:0]
AUTO/MAN SD/HD
GS2975A Functional Block Diagram
Revision History
LOCKED LOS
AUTOBYPASS
BYPASS
Version ECR PCN Date
Changes and/or Modifications
4
151358
April 2009
Added 2.5k reel option to section 6.6
Ordering Information. Changed the
maximum input swing value from 800mV
to 1100mV in Table 2-2: AC Electrical
Characteristics.
3
150068
June 2008
Removed references to GND_DRV in
Section 1.1 GS2975A Pin Assignment and
Table 1-1: Pin Descriptions.
2
147068
August 2007
Typo: Functional Block Diagram on
page 2.
1
146316
July 2007
Typo: Pin 64 in Table 1-1& TAC Figure 5-1
on page 22, Pins 38/40 & 44/46 in
Table 1-1.
0 143947 43428 February 2007 Converting to Data Sheet. Removed
‘Proprietary and Confidential’ footer.
Updated AC Electrical Characteristics
table. Added junction - board thermal
resistance parameter to 6.3 Packaging
Data. Added section 6.4 Marking
Diagram.
GS2975A HD-LINX® III Multi-Rate SDI Automatic
Reclocker with Dual Differential Outputs
Data Sheet
41487 - 4
April 2009
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Contents
Features ................................................................................................................................................................. 1
Applications ......................................................................................................................................................... 1
Description ........................................................................................................................................................... 1
Functional Block Diagram ..............................................................................................................................2
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 GS2975A Pin Assignment ..............................................................................................................4
1.2 GS2975A Pin Descriptions .............................................................................................................5
2. Electrical Characteristics ............................................................................................................................8
2.1 Absolute Maximum Ratings ..........................................................................................................8
2.2 DC Electrical Characteristics ........................................................................................................8
2.3 AC Electrical Characteristics ..................................................................................................... 10
3. Input/Output Circuits ............................................................................................................................... 13
4. Detailed Description.................................................................................................................................. 16
4.1 Slew Rate Phase Lock Loop (S-PLL) ......................................................................................... 16
4.2 VCO .................................................................................................................................................... 17
4.3 Charge Pump ................................................................................................................................... 17
4.4 Frequency Acquisition Loop — The Phase-Frequency Detector .................................. 18
4.5 Phase Acquisition Loop — The Phase Detector ................................................................... 18
4.6 4:1 Input Mux .................................................................................................................................. 19
4.7 Automatic and Manual Data Rate Selection ......................................................................... 19
4.8 Bypass Mode ................................................................................................................................... 20
4.9 DVB-ASI Operation ....................................................................................................................... 20
4.10 Lock and LOS ................................................................................................................................ 20
4.11 Output Drivers and Output Mute .......................................................................................... 21
5. Typical Application Circuit ..................................................................................................................... 22
6. Package & Ordering Information .......................................................................................................... 23
6.1 Package Dimensions ..................................................................................................................... 23
6.2 Recommended PCB Footprint ................................................................................................... 24
6.3 Packaging Data ............................................................................................................................... 25
6.4 Marking Diagram ........................................................................................................................... 25
6.5 Solder Reflow Profiles .................................................................................................................. 26
6.6 Ordering Information ................................................................................................................... 26
GS2975A HD-LINX® III Multi-Rate SDI Automatic
Reclocker with Dual Differential Outputs
Data Sheet
41487 - 4
April 2009
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1. Pin Out
1.1 GS2975A Pin Assignment
DDI0
DDI0_VTT
DDI0
GND
DDI1
DDI1_VTT
DDI1
GND
DDI2
DDI2D_VDTI2T
GND
DDI3
DDI3_VTT
DDI3
GND
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1 48
2 47
3 46
4 45
5 44
6 43
7 GS2975A 42
8
64-pin QFN
41
(Top View)
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
VEE_DDO
VCC_DDO
DDO0
RSV
DDO0
GND
VEE_RCO
VCC_RCO
RCO/DDO1
RSV
RCO/DDO1
DATA/CLOCK
DDO_MUTE
RCO_MUTE
KBB
SD/HD
Ground Pad
(bottom of package)
Figure 1-1: 64-Pin QFN
GS2975A HD-LINX® III Multi-Rate SDI Automatic
Reclocker with Dual Differential Outputs
Data Sheet
41487 - 4
April 2009
4 of 27
Free Datasheet http://www.datasheet4u.com/



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