LMH0318_15 Datasheet, PDF (46/57 Pages) Texas Instruments – LMH0318 3 Gbps HD/SD SDI Reclocker with Integrated Cable Driver

LMH0318
SNLS508 – SEPTEMBER 2015
www.ti.com
9.2.2 Detailed Design Procedure
To begin the design process, determine the following:
1. Maximum power draw for PCB regulator selection. In this case, use the transient CDR power (during
acquisition) specified in the datasheet, multiplied by the number of channels.
2. Maximum operational power for thermal calculation. For thermal calculation, use the locked power number.
Transient power consumption is only observed during lock acquisition, which typically lasts for <5ms.
Additional margin can be applied in case of unsupported data rates being applied which extend the lock time.
Note that the CDR should operate in bypass mode for any unsupported data rates.
3. Consult the BNC vendor for optimum BNC landing pattern.
4. Use IBIS-AMI model for simple channel simulation before PCB layout.
5. Closely compare schematic against typical connection diagram in the data sheet.
6. Plan out the PCB layout and component placement to minimize parasitic.
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