Datasheet

LMH0302
SNLS247G –APRIL 2007–REVISED APRIL 2013 www.ti.com
AC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
(1)
.
Symbol Parameter Conditions Reference Min Typ Max Units
DR
SDI
Input Data Rate SDI, SDI 2970 Mbps
t
jit
Additive Jitter 2.97 Gbps SDO, SDO 20 ps
P-P
1.485 Gbps 18 ps
P-P
270 Mbps 15 ps
P-P
t
r
,t
f
Output Rise Time, Fall Time SD/HD = 0, 20% – 80%, 90 130 ps
SD/HD = 1, 20% – 80% 400 800 ps
Mismatch in Rise/Fall Time SD/HD = 0 30 ps
SD/HD = 1 50 ps
Duty Cycle Distortion SD/HD = 0, 2.97 Gbps
(2)
27 ps
SD/HD = 0, 1.485 Gbps
(2)
30 ps
SD/HD = 1
(2)
100 ps
t
OS
Output Overshoot SD/HD = 0
(2)
10 %
SD/HD = 1
(2)
8 %
RL
SDO
Output Return Loss 5 MHz - 1.5 GHz
(3)
15 dB
1.5 GHz - 3.0 GHz
(3)
10 dB
(1) Typical values are stated for V
CC
= +3.3V and T
A
= +25°C.
(2) Specification is ensured by characterization.
(3) Output return loss is dependent on board design. The LMH0302 meets this specification on the SD302 evaluation board.
DEVICE OPERATION
INPUT INTERFACING
The LMH0302 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple AC
or DC coupling. DC-coupled inputs must be kept within the specified common-mode range.
OUTPUT INTERFACING
The LMH0302 uses current mode outputs. Single-ended output levels are 800 mV
P-P
into 75Ω AC-coupled
coaxial cable with an R
REF
resistor of 750Ω. The R
REF
resistor is connected between the R
REF
pin and V
CC
. The
only resistor value that should be used for R
REF
is 750Ω.
The R
REF
resistor should be placed as close as possible to the R
REF
pin. In addition, the copper in the plane
layers below the R
REF
network should be removed to minimize parasitic capacitance.
OUTPUT SLEW RATE CONTROL
The LMH0302 output rise and fall times are selectable for either SMPTE 259M or SMPTE 424M / 292M
compliance via the SD/HD pin. For slower rise and fall times, or SMPTE 259M compliance, SD/HD is set high.
For faster rise and fall times, or SMPTE 424M and SMPTE 292M compliance, SD/HD is set low.
OUTPUT ENABLE
The SDO/SDO output driver can be enabled or disabled with the ENABLE pin. When set low, the output driver is
powered off. ENABLE has an internal pullup.
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