LCDA12C-1 Datasheet, PDF (4/6 Pages) Semtech Corporation – Low Capacitance TVS Diode Array

LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS
Applications Information
Device Connection for Metallic Protection of High-
Speed Data Lines
The LCDAxxC-1 is designed to protect high-speed data
lines from transient over-voltages which result from
lightning and ESD. The device is designed to protect
one line in common mode (Line-to-Ground) or one line
pair in metallic (Line-to-Line) mode. For metallic mode
protection, the input of line 1 is connected at pin 1 and
the output is connected at pin 4. Likewise, the input
of line 2 is connected at pin 2 and the output is con-
nected at pin 3. For common mode protection, ground
either pins 1 & 4 or pins 2 & 3. The ground connection
should be made directly to the ground plane for best
results.
ADSL Protection
A typical ADSL protection circuit is shown in Figure
3. The LCDA12C-1 (or LCDA15C-1 for 15 volt drivers)
is connected from each line to ground on the IC side of
the line. They provide lightning and ESD protection for
the sensitive line driver IC.
Line
In
1
4
Line
Out
Line
2
In
3
Line
Out
Figure 1 - Connection for Differential Protection
(Line-to-Line)
Line
In
1
4
Line
Out
2
3
Figure 2 - Connection for Common Mode
Protection (Line-to-Ground)
ã 2000 Semtech Corp.
Figure 3 - ADSL Protection Circuit
4
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