Datasheet

LMH0346
RATE0
RATE1
OP MUTE
XTAL IN/EXT CLK
LF2
LF1
SDI
SDI
V
CC
BP/
AUTO-BP
1
2
3
4
5
6
7
8
9
10
SCO_EN
11
12
13
14
15
16
17
18
19
20
XTAL OUT
LOCK DET
SCO/SDO2
SCO/SDO2
V
CCO
V
CCO
SDO
SDO
HD
SD/
Coaxial Cable
75:
37.4:
75:
6.8 nH
LMH0344 Adaptive
Cable Equalizer
SDI
SDO
SDI
AEC+
AEC-
SDO
100:
56 nF
27 MHz
DAP
39 pF 39 pF
75:
LMH0302
Cable Driver
SD/HD
SDO
SDI
R
REF
SDO
SDI
100:
75:
75:
75:
75:
750:
B
C
Additional
Outputs
A
B
C
75:
LOCK DET
OP MUTE
BP/
AUTO-BP
V
CC
V
CC
RATE0
RATE1
A
+3.3V
+3.3V
SCO_EN
Coaxial Cable
Coaxial Cable
1.0 PF
1.0 PF
1.0 PF
4.7 PF
4.7 PF
5.6 nH
5.6 nH
LMH0346
SNLS248J –APRIL 2007–REVISED APRIL 2013 www.ti.com
APPLICATION INFORMATION
Figure 6 shows an application circuit for the LMH0346 along with the LMH0344 3 Gbps HD/SD SDI Adaptive
Cable Equalizer and LMH0302 3 Gbps HD/SD SDI Cable Driver.
Figure 6. Application Circuit
The LMH0346 inputs are LVPECL compatible. The LMH0346 has a wide input common mode range and in most
cases the input should be DC coupled. For DC coupling, the inputs must be kept within the common mode range
specified in DC ELECTRICAL CHARACTERISTICS. Figure 6 shows an example of a DC coupled interface
between the LMH0344 cable equalizer and the LMH0346. The LMH0344 output common mode voltage and
voltage swing are within the range of the input common mode voltage and voltage swing of the LMH0346. All
that is required is a 100Ω differential termination as shown. The resistor should be placed as close to the
LMH0346 input as possible. If desired, this network may be terminated with two 50Ω resisters and a center tap
capacitor to ground in place of the single 100Ω resistor.
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