Device Configuration; Common Device Configuration; Lmh0318 Smpte Configuration - Texas Instruments LMH0318 Programmer's Manual

Device Configuration

4 Device Configuration
The following sections provide guidance for programming the LMH0318 for certain common applications.
Throughout the rest of the document, macro examples are given to setup the device for different
configurations and settings.
4.1

Common Device Configuration

The LMH0318 supports SMPTE data rates. Once configured for SMPTE application, the LMH0318 can be
optioned to lock to a selection of data rates and report lock status. The following is an example of common
register settings for the LMH0318 initialization followed by possible settings to support SMPTE data rates.
COMMAND REGISTER
RAW FF
RAW 16
RAW 3E
RAW 55
RAW 6A
RAW 03
RAW 0A
RAW 0A
RAR
RAW 31
RAW 2F
RAW 0A
RAW 0A
RAR 02
RAW 0C
RAR 02
RAW 0C
6
LMH0318 Programming Guide
Table 2. LMH0318 SMPTE Configuration
VALUE MASK
04 07
25 FF
00 80
02 02
00 FF
XX FF
0C 0C
00 0C
1 1 1
1 3
00 C0
0C 0C
00 0C
18 18
30 F0
38 38
00 F0
Copyright © 2015, Texas Instruments Incorporated
//Comments
//Initialization sequence
//Select Channel Registers
//Enable Full Temperature Range
//Initialize CDR State Machine Control
//Use the desired CTLE settings. See
CTLE setting
//Reset CDR
//Release CDR reset
//In default mode, the LMH0318 automatically locks to different SMPTE
and ST-2082/1 data rates
//Read LOS of IN0
//Assuming signal is present on IN0, enable IN0 to 75 Ω OUT0 and power
down 50 Ω OUT1
//Default SMPTE is enabled
//Reset CDR
//Release CDR Reset
//If reg 0x02[4:3] = 11'b, CDR locked
//Setup register 0x0C to enable reg 0x02 to read the VCO divider settings
//0x02[5:3] Indicates lock rates
//Setup register 0x0C to enable reg 0x02 to read lock indication
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CTLE Test Mode to determine the
SNLU183 – September 2015
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