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APPLICATIONS NOTE AN-80-001
Using model PSW-1211 as a SPST switch
‘As shown by the functional block diagrams, the PSW-1211 is very similar to the discontinued mode!
PSW-1111., Because ofthis similanty, with the addition of a 50 ohm resistor at output #1, the PSW-1211
‘can be used in place of the PSW-1111
Functional block diagrams
comes ton ene comes cr
eee an zi $ alee
. sth Deo org Teor siro
ae F z = = +
Figure 1: PSW-1111, SPST switch Figure 2: PSW-1211, SPOT switch
een L aa
SA re
= x
Figure 3: PSW-1211 with 50 ohm resistor at output #1
With ouput #1 terminated in 60 ohms, the PSW-1211 may be operated as either an absorpth
reflective SPST switch.
ora
For an absorptive application, both control #1 and #2 must be used. The logic is given in table 1
Control #1 Control#2,-—Output
(in 1) (in7) in 8)
State 1: ov +5 ‘ON
State 2: +8 ov OFF
Table 1. Logic of PSW-1211 used as SPST absorptive switch
At state 2, the signal path closes from the input (pin §) to pin 2 and the signal is absorbed at the $0
‘ohm termination.
For a reflective application, control #1 can be either open or grounded. This will cause the signal to
reflect back to the input source when control #2 is O vot
‘Our discussion has focused on using the PSW-1211 as a replacement for the PSW-1111 with pin 8
‘as the output, However, ifthe PC board layout is such that terminating pin 8 in 50 ohms is more
‘convenient, then this may be done and pin 2 can be used as the output with opposite logic.
Please direct any questions or comments on this application note to our Applications Dept.
” ‘AN-80-001rev:OR 128/04 M33704
FEIMINF-Ci ruts’ +0. 221s510 s0sinn nowvon 12018 (1) so44500 Fux 8) Bate
‘Distribution Centers /NORTH AMERICA e004#i4-7B40-417-0058005 FaL‘17-Sa5e0© EUROPE ae zepnnoas Fax 44 282-407010
