Datasheet

LMH0356
SNLS270K –AUGUST 2007–REVISED APRIL 2013 www.ti.com
Table 3. Control Functionality
LOCK DETECT OUTPUT MUTE BYPASS/AUTO BYPASS DEVICE STATUS
0 1 X PLL unlocked, reclocker bypassed
1 1 0 PLL locked to supported data rate, reclocker not bypassed
X 0 X Outputs muted
0 LOCK DETECT X Outputs muted
1 LOCK DETECT 0 PLL locked to supported data rate, reclocker not bypassed
SD/HD
The SD/HD output indicates whether the LMH0356 is processing SD or HD / 3 Gbps data rates. It may be used
to control another device such as the LMH0302 cable driver. When this output is high it indicates that the data
rate is 270 Mbps. When low, the indicated data rate is 1483, 1485, 2967, or 2970 Mbps. The SD/HD output is a
registered function and is only valid when the PLL is locked and the Lock Detect output is high. When the PLL is
not locked (the Lock Detect output is low), the SD/HD output defaults to HD (low). The SD/HD output is
undefined for a short time after lock detect assertion or de-assertion due to a data rate change on SDI. See
Figure 5 for a timing diagram showing the relationship between SDI, Lock Detect, and SD/HD.
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