The selectable lowpass/bandpass filter IC Is a
CMOS chip that can be configured for either a
lowpass or a bandpass filter. The lowpass
response can be a 7 pole Butterworth, Elliptic
or Bessel filter. The band pass response can be
a six pole full, third or sixth octave bandpass
filter. The device uses switched-capacitor filters
and no external components (except for
decoupling capacitors) are required, Only an
external CMOS level clock is needed.
A four input multiplexor and externally selectable
gain setting pin, along with a power down
and clock to corner ratio select pin are included
in the 16 pin version. An 8 pin version is also
available for PC board area savings. Typical
current consumption is as low as 200 uA and
the minimum operating voltage is 2.7 volts,
making the device ideal for portable applications.
MSFS3, MSFS4 and MSFS6 are low current,
lower frequency versions.