GS2972 Datasheet, PDF (83/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

Table 4-26: GS2972 PLL Bandwidth
Mode
SD
SD
HD
HD
3G
PCLK Frequency
(MHz)
13.50
27.00
74.25
148.50
148.50
Filter Resistor
(Ω)
200
200
200
200
200
Charge Pump
Current (μA)
100
100
100
100
100
Bandwidth
(kHz)
4.78
9.57
26.32
52.63
52.63
4.11.2 Lock Detect
The Lock Detect block controls the serial digital output signal and indicates to the
application layer the lock status of the device.
The LOCKED output pin is provided to indicate the device operating status.
The LOCKED output signal is set HIGH by the lock detect block under the following
conditions (see Table 4-27):
Table 4-27: GS2972 Lock Detect Indication
RESET
HIGH
HIGH
HIGH
PLL Lock
HIGH
HIGH
HIGH
SMPTE_BYPASS
HIGH
LOW
LOW
DVB_ASI
LOW
HIGH
LOW
RATE_SEL0
X
HIGH
X
Any other combination of signal states not included in the above table results in the
LOCKED pin being LOW.
Note: When the LOCKED pin is LOW, the serial digital output is in the muted state.
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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