CM1214A Datasheet, PDF (6/9 Pages) California Micro Devices Corp – 1 and 2 Channel PicoGuardTM AC Signal ESD Protector

CM1214A
Application Information
CM1214A-01SO
The CM1214A-01SO protects a single bipolar signal
line often found in RF circuits. One I/O pin (pin 1 for
example) is connected to the signal line for protection,
and the other I/O pin is tied to GND. It is important to
have a solid ground connection to reduce the clamping
voltage. Pin 3 of the 3-lead SOT23 must be left open
(and not connected on the PCB).
CM1214A-02MR
The CM1214A-02MR protects two bipolar lines, such
as for Gbit Ethernet. The PCB traces underneath the
package connect across to the corresponding pins
(Pins 1, 4, 6 and 7). Pins 2, 3, 5 and 8 of the MSOP-8
package must be left open (and not connected on the
PCB).
Any disturbance on the line above or below the
standoff voltage is clamped.
RF ANTENNA
CL
GND
SIGNAL LINE
ESD
SWITCH
N.C.
ESD
SOT23-3
LNA
PA
Figure 7. Typical Application - RF Switch and Amplifier Protection,
CM1214A-01SO in 3-lead SOT23
CM1214A-02MRR
CM1214A-02RMR
Figure 8. Typical Application - Ethernet Protection, CM1214A-02MR in 8-lead MSOP
© 2007 California Micro Devices Corp. All rights reserved.
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Issue A – 10/29/07