Datasheet
75:
75:
75:
75:
75:
75:
Coaxial Cable
Coaxial Cable
4.7 PF
4.7 PF
6.8 nH
6.8 nH
SCL
LMH0303
V
EE
SDI
SDI
SDO
SD/HD
V
CC
ENABLE
SCL
NC
NC
R
REF
SDO
SDA
RSTI RSTO
FAULT
49.9:
49.9:
Differential
Input
750:
V
CC
ENABLE
RSTI
SDA
V
CC
V
CC
10 k: 10 k:
SD/HD
10 k:
V
CC
RSTO
FAULT
V
CC
0.1 PF
0.1 PF
1
2
3
4 9
10
11
12
5
6
7
8 13
14
15
16
0.1 PF
DAP
LMH0303
SNLS285G –APRIL 2008–REVISED APRIL 2013
www.ti.com
APPLICATION INFORMATION
Figure 3 shows the application circuit for the LMH0303.
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.
8 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LMH0303