Filter Selection

The filter type is selected using the two filter se-

lect pins, TYPE

and FSEL, FSEL is a CMOS

level pin that selects lowpass or

bandpass

response (lowpass = 0, bandpass = 2). TYPE Is

a tertiary control pin that selects the filter

response.

State 0 is VSS, state 1 is GND and

state 2 is VDD.

TYPE

Lowpass

Bandpass

0

Butterworth

Full Octave

1

Bessel

Third Octave

2

Elliptic

Sixth Octave

Gain and Frequency Selection

The Gain select pin G is a tertiary control pin

where state 0 is VSS, state 1 is GND level and

state 2 is VDD.

G

Gain

0

OdB

1

10dB

2

20dB

The clock to corner select pin F0 is a CMOS

level pin where HIGH is clock to corner of 12.5

to 1 (25 to 1 for Bessel) and LOW is clock to

corner of 6.25 to 1 (12.5 to 1 for Bessel). The

sample rate ratio is twice the clock to corner

ratio (double sampling).

©2011-2

2014 Mixeed Signal Inteegratioon

4

Weeb Sitee ““www.mix-ssig.coom””

6/2014

Selecttable Very High Frequency LP//BP Filtter

Datta Sheett