Datasheet

LMH0384
www.ti.com SNLS308F –APRIL 2009–REVISED APRIL 2013
Table 1. SPI Registers (continued)
Address R/W Name Bits Field Default Description
01h R/W Output Driver 7:5 Output Swing 011 Output driver swing (V
SSP-P
).
000: V
SSP-P
= 400 mV
P-P
.
001: V
SSP-P
= 500 mV
P-P
.
010: V
SSP-P
= 600 mV
P-P
.
011: V
SSP-P
= 700 mV
P-P
.
100: V
SSP-P
= 800 mV
P-P
.
101, 110, 111: Reserved.
4:2 Offset Voltage 001 Output driver offset voltage
(common mode voltage).
000: V
OS
= 1.05V.
001: V
OS
= 1.25V.
010: V
OS
= 1.45V.
011: V
OS
= 1.65V.
100: V
OS
= 1.85V.
101: V
OS
referenced to positive
supply.
110, 111: Reserved.
1:0 Reserved 00 Reserved as 00. Always write
00 to these bits.
02h R/W Launch Amplitude 7 Coarse Control 0 Coarse launch amplitude
optimization.
0: Normal optimization with no
external attenuation (800 mV
P-P
launch amplitude).
1: Optimized for 6 dB external
attenuation (400 mV
P-P
launch
amplitude).
6:3 Fine Control 0000 Launch amplitude optimization
fine tuning.
0000: Nominal.
0001: -4% from nominal.
0010: -8% from nominal.
0011: -11% from nominal.
0100: -14% from nominal.
0101: -17% from nominal.
0110: -20% from nominal.
0111: -22% from nominal.
1000: Nominal.
1001: +4% from nominal.
1010: +9% from nominal.
1011: +14% from nominal.
1100: +20% from nominal.
1101: +26% from nominal.
1110: +33% from nominal.
1111: +40% from nominal.
2:0 Reserved 000 Reserved as 000. Always write
000 to these bits.
03h R CLI 7:3 CLI Cable Length Indicator.
Provides an indication of the
length of cable attached to the
input. CLI increases as the
cable length increases.
2:0 Reserved 000 Reserved.
04h R Device ID 7:0 Die Revision 00000010 Die revision.
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