GS2972 Datasheet, PDF (86/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

4.12.3 Slew Rate Selection
The GS2972 supports two user-selectable output slew rates.
Control of the slew rate is determined by the setting of the RATE_SEL0 input pin.
When this pin is set HIGH, the output slew rate matches the requirements as defined by
the SMPTE ST 259-C standard.
When this pin is set LOW, the output slew rate is better than the requirements as defined
by the SMPTE ST 424 standard.
These requirements is met across all ambient temperature and power supply operating
conditions described in Section 2.
This requirement is summarized in Table 4-31:
Table 4-31: Serial Digital Output - Rise/Fall Time
Parameter
Symbol
Conditions
Min
Typ
Serial Output Rise/Fall Time
20% ~ 80%
SDO_TR
SMPTE ST 292/ST 424 signal
SMPTE ST 259-C signal
−
400
−
−
4.12.4 Serial Digital Output Mute
When the SDO_EN/DIS pin is LOW, the serial digital output signals of the device become
high-impedance, reducing system power.
The serial digital output is also placed in the high-impedance state when the LOCKED
pin is LOW, or when the STANDBY pin is HIGH.
Max
135
800
Units
ps
ps
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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