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Device Configuration
4.2.2.3
LMH0318 Register Initialization
After power up, ENABLE pin transition from low to high, or
register initialization.
RAW FF
04
RAW 16
25
RAW 3E
00
RAW 55
02
RAW 6A
00
RAW 03
XX
RAW 0A
0C
RAW 0A
00
4.2.3
Force Power Down
The ENABLE pin (#6) can be used to force the LMH0318 in power down. Additionally, the LMH0318
powers down when there is loss of signal (selected channel Signal Detect is not asserted). There could be
a need to power down the device even when there is active signal. This could be achieved either by
disabling ENABLE pin or forcing the signal detect de-asserted and thus powering down the selected
channel.
To force IN0 signal detect off:
RAW FF
04
RAW 14
40
To force IN1 signal detect off:
RAW FF
04
RAW 15
40
After forcing signal detect off, the controlling program may need to enable the signal detect on IN0 or IN1
(normal operation):
RAW FF
04
RAW 14
00
RAW FF
04
RAW 15
00
8
LMH0318 Programming Guide
07
//Select Channel Registers
FF
//Enable Full Temperature Range
80
//Initialize CDR State Machine Control
02
FF
FF
//Use the desired CTLE settings. See
setting
0C
//Reset CDR
0C
//Release CDR reset
07
//Select Channel Registers
C0
//Force Signal Detect Off for IN0
07
//Select Channel Registers
C0
//Force Signal Detect Off for IN1
07
//Select Channel Registers
C0
//IN0 Signal Detect Normal Operation
07
//Initialize CDR State Machine Control
C0
//IN1 Signal Detect Normal Operation
Copyright © 2015, Texas Instruments Incorporated
LMH0318 Register Reset
CTLE Test Mode
to determine the CTLE
SNLU183 – September 2015
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