Datasheet

LMH0394
www.ti.com SNLS312L –AUGUST 2010–REVISED APRIL 2013
Table 1. SPI Registers (continued)
Address R/W Name Bits Field Default Description
01h R/W Output Driver 7:6 Output Swing 10 Output driver swing (V
SSP-P
).
00: V
SSP-P
= 400 mV
P-P
.
01: V
SSP-P
= 600 mV
P-P
.
10: V
SSP-P
= 700 mV
P-P
.
11: V
SSP-P
= 800 mV
P-P
.
5:4 Offset Voltage 10 Output driver offset voltage
(common mode voltage).
00: V
OS
= 0.8V.
01: V
OS
= 1.0V.
10: V
OS
= 1.2V.
11: V
OS
referenced to positive
supply.
3 De-Emphasis 0 Output driver de-emphasis
control.
0: De-emphasis disabled.
1: De-emphasis enabled.
2:1 De-Emphasis Amplitude 01 Output driver de-emphasis
Level level.
00: 0 dB (no de-emphasis).
01: 3 dB de-emphasis.
10: 5 dB de-emphasis.
11: 7 dB de-emphasis.
0 Reserved 0 Reserved (read only).
02h R/W Launch Amplitude 7 Launch Amplitude Control 0 Launch amplitude optimization
Control setting.
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).
6:0 Reserved 1101000 Reserved as 1101000. Always
write 1101000 to these bits.
03h R/W MUTE
REF
7:6 Reserved 00 Reserved as 00. Always write
00 to these bits.
5 MUTE
REF
Mode 0 0: Use MUTE
REF
pin.
1: Use digital MUTE
REF
.
4:0 Digital MUTE
REF
Setting 11111 Digital MUTE
REF
(10m per
step).
00000: Mute when cable (EQ
boost) ≥ 10m.
......
01111: Mute when cable (EQ
boost) ≥ 160m.
......
11111: Never mute.
04h R Device ID 7:6 Reserved 00 Reserved.
5:4 EQ ID 01 00: LMH0384 device.
01: LMH0394 device.
10: LMH0395 device.
11: Reserved.
3:0 Die Revision 0011 Die revision.
05h R Rate Indicator 7:6 Reserved 00 Reserved.
5 Rate Indicator 0: SD.
1: 3G/HD.
4:0 Reserved 11000 Reserved.
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