Datasheet
LMH0387
SNLS315G –APRIL 2010–REVISED APRIL 2013
www.ti.com
Control Pin Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
(1)(2)
.
Symbol Parameter Conditions Reference Min Typ Max Units
V
IH
Input Voltage High Level Logic Inputs 2.0 V
CC
V
V
IL
Input Voltage Low Level V
EE
0.8 V
V
OH
Output Voltage High Level I
OH
= -2 mA Logic Outputs 2.4 V
V
OL
Output Voltage Low Level I
OL
= +2 mA 0.4 V
(1) Current flow into device pins is defined as positive. Current flow out of device pins is defined as negative. All voltages are stated
referenced to V
EE
= 0 Volts.
(2) Typical values are stated for V
CC
= +3.3V and T
A
= +25°C.
Input Mode (Equalizer) DC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
(1)(2)
.
Symbol Parameter Conditions Reference Min Typ Max Units
V
IN
Input Voltage Swing 0m cable length
(3)
BNC_IO 720 800 950 mV
P−P
V
SSP-P
Differential Output Voltage, P-P 100Ω load, default register SDO, SDO 500 700 900 mV
P-P
settings, Figure 1
(4)
V
OD
Differential Output Voltage 250 350 450 mV
ΔV
OD
Change in Magnitude of V
OD
for
50 mV
Complimentary Output States
V
OS
Offset Voltage 1.125 1.25 1.375 V
ΔV
OS
Change in Magnitude of V
OS
for
50 mV
Complimentary Output States
I
OS
Output Short Circuit Current 30 mA
CD
THRESH
DC Voltage (floating) CD
THRESH
1.3 V
CD
THRESH
Range 0.8 V
I
CC
Supply Current Equalizing cable > 120m
91 113 mA
(Belden 1694A), TX_EN = 0
Equalizing cable ≤ 120m
71 mA
(Belden 1694A), TX_EN = 0
(5)
Power save mode (equalizer in
11 mA
sleep mode, TX_EN = 0)
(1) Current flow into device pins is defined as positive. Current flow out of device pins is defined as negative. All voltages are stated
referenced to V
EE
= 0 Volts.
(2) Typical values are stated for V
CC
= +3.3V and T
A
= +25°C.
(3) The LMH0387 equalizer can be optimized for different launch amplitudes via the SPI.
(4) The differential output voltage and offset voltage are adjustable via the SPI.
(5) The equalizer automatically shifts equalization stages at cable lengths less than or equal to 120m (Belden 1694A) to reduce power
consumption. This power savings is also achieved by setting Extended 3G Reach Mode = 1 via the SPI. (Note: Forcing the Extended
3G Reach Mode in this way increases the cable reach for 3G data rates but also limits the achievable cable lengths at HD and SD data
rates).
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