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GS2972 Datasheet(PDF) 32 Page - Semtech Corporation

Part # GS2972
Description  3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support
PDF  125 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS2972 Datasheet(HTML) 32 Page - Semtech Corporation

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GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet
Rev. 9
GENDOC-047479
September 2013
32 of 125
www.semtech.com
The GS2972 is a high performance 3Gb/s capable transmitter. In order to optimize the
output jitter performance across all operating conditions, input levels and overshoot at
the parallel video data inputs of the device need to be controlled. In order to do this,
source series termination resistors should be used to match the impedance of the PCB
data trace line. IBIS models can be used to simulate the board effects and then optimize
the output drive strength and the termination resistors to allow for the best transition
(one that produces minimal overshoot). If this is not viable, Semtech recommends
matching the source series resistance to the trace impedance, and then adjusting the
output drive strength to the minimum value that will give zero errors.
The above also applies to the PCLK input line. HVF and the Audio inputs should also be
well terminated, however due to the lower data rates and transition density it is not as
critical.
20-bit data Input
HD format
HIGH
LOW
LOW
LOW
LOW
DATA
DATA
20-bit demultiplexed SD
format
HIGHHIGHX
HIGHLOW
Chroma
Luma
20-bit data input
SD format
HIGHHIGHX
LOW
LOW
DATA
DATA
10-bit multiplexed
3G DDR format
LOW
LOW
HIGHHIGHLOW
High
Impedance
Data Stream
One/Data Stream
Two
10-bit multiplexed
HD format
LOW
LOW
LOW
HIGHLOW
High
Impedance
Luma/Chroma
10-bit data input
HD format
LOW
LOW
LOW
LOW
LOW
High
Impedance
DATA
10-bit multiplexed
SD format
LOW
HIGHX
HIGHLOW
High
Impedance
Luma/Chroma
10-bit multiplexed
SD format
LOW
HIGHX
LOW
LOW
High
Impedance
DATA
10-bit ASI input
SD format
LOW
HIGHX
LOW
HIGH
High
Impedance
DVB-ASI data
Table 4-2: GS2972 Input Video Data Format Selections (Continued)
Input Data Format
Pin/Register Bit Settings
DIN[9:0]
DIN[19:10]
20BIT
/10BIT
RATE
_SEL0
RATE
_SEL1
SMPTE
_BYPASS
DVB_ASI



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