GS2972 Datasheet, PDF (84/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

4.12 Serial Digital Output
The GS2972 has a single, low-impedance current mode differential output driver,
capable of driving at least 800mV into a 75Ω single-ended load.
The output signal amplitude, or swing, will be user-configurable using an external
resistor on the RSET pin.
The serial digital output data rate supports SMPTE ST 424, SMPTE ST 292,
SMPTE ST 259-C and DVB-ASI operation. This is summarized in Table 4-28:
Table 4-28: Serial Digital Output - Serial Output Data Rate
Parameter
Serial Output Data Rate
Symbol
BRSDO
Conditions
SMPTE ST 424 signal
SMPTE ST 292 signal
SMPTE ST 259-C signal
DVB-ASI signal
Min
−
−
−
−
Typ
2.97, 2.97/1.001
1.485, 1.485/1.001
270
270
The SDO and SDO pins of the device provide the serial digital output.
Compliance with all requirements defined in Section 4.12.1 through Section 4.12.4 is
guaranteed when measured across a 75Ω terminated load at the output of 1m of Belden
1694A cable, including the effects of the Semtech recommended ORL matching
network, BNC and coaxial cable connection, except where otherwise stated.
Figure 4-28 illustrates this requirement, which is in accordance with the measurement
methodology defined in SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259-C.
Max
−
−
−
−
Units
Gb/s
Gb/s
Mb/s
Mb/s
DUT
GS2972
ORL
Matching
Network
Measuring Device
1m Belden 1694A 75Ω
Coaxial Cable
BNC
BNC
75Ω
Resistive
Load
Figure 4-28: ORL Matching Network, BNC and Coaxial Cable Connection
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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