TYPE

Lowpass

Bandpass

0

Butterworth

Full Octave

1

Bessel

Third Octave

2

Elliptic

Sixth Octave

The filter type is selected using the two filter select pins,

TYPE and FSEL, FSEL is a CMOS level pin that selects

lowpass or bandpass (lowpass = 0, bandpass = 1). TYPE

Is a tertiary control pin that selects the filter response.

State 0 is VSS, state 1 is GND and state 2 is VDD.

Selectable Lowpass/Bandpass Filter

Data Sheet

03/2001

Pin Description________________

1. TYPE

Filter Response Select Pin.

2. S2

Input Multiiplexor Select Pin

3. CLK

Clock Input

4. G

Gain Select Pin

5. VDD

Positive Power Supply, Typically 2.5

Volts for Split Supply 5.0 Volts for

Single SuppLy

6. PD

Power Down Pin, CMOS level,

Hi = Power Down

7, VSS

Negative Power Supply, Typically -2.5

Volts for Split Supply. 0 Volts for Single

Supply

8. F0

Clock to Corner Select Pin

9. GND

GND Pin, OV for Split Supplies

2.5 Volts Typical for Single Supply

10. IN1

Input 1, Select Code 00

11. IN2

Input 2, Select Code 01

12. IN3

Input 3, Select Code 10

13. IN4

Input 4, Select Code 11

14. FSEL

Selects Filter.

O = Low Pass, 1 = Bandpass

15. Out

Filter Output

16. S1

Input Multiplexor Select Pin

Pin Configuration

Filter Selection________________

The Gain control 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 frequency control pin F0 is a CMOS level pin where

high is clock to corner of 100 to 1 (200 to 1 for Bessel)

and low is clock to corner of 50 to 1 (100 to 1 for Bessel).

FSEL

IN

OUT

GND

TYPE

VSS

CLK

5

VDD

16

15

14

13

12

11

10

9

TYPE

S1

S2

OUT

CLK

FSEL

G

IN4

VDD

IN3

PD

IN2

VSS

IN1

F0

GND

8 Pin

16 Pin

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© 2001 Mixed Signal Integration 3