TYPE

Lowpass

Bandpass

0

Butterworth

Full Octave

1

Bessel

Third Octave

2

Elliptic

Sixth Octave

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 (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 High Frequency LP/BP Filter

Data Sheet

7/2016

Pin Description________________

1. TYPE

Filter Response Select Pin.

2. S2

Input Multiplexor Select Pin

3. CLK

Sine Wave 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 _______________ Gain and Frequency 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 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).

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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