LMH0318_15 Datasheet, PDF (48/57 Pages) Texas Instruments – LMH0318 3 Gbps HD/SD SDI Reclocker with Integrated Cable Driver

LMH0318
SNLS508 – SEPTEMBER 2015
www.ti.com
9.3 Do's and Don'ts
In order to meet SMPTE standard requirements for jitter, AC timing, and return loss use the following guidelines:
1. Do place BNC as close to the device as possible.
2. Do consult BNC vendor to provide optimum landing pad for the BNC to comply with the required
specifications.
3. Place return loss network as close to the device as possible.
4. Do pay attention to the recommended solder paste to ensure reliable GND connection to DAP.
5. Do use control impedance for both 100 Ω and 75 Ω for IN0/1 and OUT0/1.
9.4 Initialization Set Up
After power up or register reset write the initialization sequences in Table 10.
Table 10. LMH0318 Register Initialization
DESCRIPTION
Enable Channel Registers
Enable Full Temperature Range
Initialize CDR State Machine Control
Restore media CTLE setting⁽¹⁾
Reset CDR
Release Reset
ADDRESS [Hex]
0xFF
0x16
0x3E
0x55
0x6A
0x03
0x0A
0x0A
VALUE [Hex]
0x04
0x25
0x00
0x02
0x00
xx ⁽²⁾
0x5C
0x50
(1) See LMH0318 Programming Guide (SNLU183) on how to quickly select the most appropriate CTLE boost setting.
(2) xx Value depends on media loss characteristics
10 Power Supply Recommendations
Follow these general guidelines when designing the power supply:
1. The power supply should be designed to provide the recommended operating conditions in terms of DC
voltage, AC noise, and start-up ramp time.
2. The maximum current draw for the LMH0318 is provided in the data sheet. This figure can be used to
calculate the maximum current the supply must provide. Current consumption can be derived from the typical
power consumption specification in the data sheet.
3. The LMH0318 does not require any special power supply filtering, provided the recommended operating
conditions are met. Only standard supply decoupling is required.
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