LMH0303_13 Datasheet, PDF (8/19 Pages) Texas Instruments – 3 Gbps HD/SD SDI Cable Driver with Cable Detect

LMH0303
SNLS285G – APRIL 2008 – REVISED APRIL 2013
APPLICATION INFORMATION
Figure 3 shows the application circuit for the LMH0303.
V_CC
V_CC
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10 k:
FAULT
75:
RSTO
49.9:
Differential
Input
0.1 PF
V_CC
49.9:
1
SDI
2
SDI
3
V_EE
4
R_REF
LMH0303
12
SDO
11
SDO
10
SD/HD
9
V_CC
75:
0.1 PF
6.8 nH
75:
4.7 PF ^{Coaxial Cable}
75:
4.7 PF ^{Coaxial Cable} 75:
75:
6.8 nH
750:
RSTI
ENABLE
SDA
SCL
V_CC
V_CC
10 k:
10 k:
0.1 PF
SD/HD
Figure 3. Application Circuit
COMMUNICATING WITH MULTIPLE LMH0303 CABLE DRIVERS VIA THE SMBus
A common application for the LMH0303 will utilize multiple cable driver devices. Even though the LMH0303
devices all have the same default SMBus device ID (address), it is still possible for them share the SMBus
signals as shown in Figure 4. A third signal is required from the host to the first device. This signal acts as a
“Enable / Reset” signal. Additional LMH0303s are controlled from the upstream device. In this control scheme,
multiple LMH0303s may be controlled via the two-wire SMBus and the use of one GPO (General Purpose
Output) signal. Other SMBus devices may also be connected to the two wires, assuming they have their own
unique SMBus addresses.
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