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MAX271
(Rev.:2012)

Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter

Maxim Integrated 

MAX270/MAX271

Digitally-Programmed, Dual

2nd-Order Continuous Lowpass Filter

TIMING CHARACTERISTICS (Figure 2)

(V+ = +5V, V- = -5V; TA = +25NC, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

CS to WR Setup

tWS

CS to WR Hold

tWH

WR Pulse Width

tSV

0

0

100

Address-Setup Time

tAS

30

Address-Hold Time

tAH

10

Data-Setup Time

tDS

30

Data-Hold time

tDH

10

Note 11: All input control signals specified with tr = tf = 5ns (10% to 90% of +5V) and timed from a +1.6V voltage level.

UNITS

ns

ns

ns

ns

ns

ns

ns

Typical Operating Characteristics

FILTER GAIN vs. FREQUENCY

0

-20

-40

V+ = +5V

V- = -5V

-60

fC CODE = 127 (25kHz TYP)

TA = +25˚C

-80

1k

10k

100k

1M

fIN (Hz)

PASSBAND FILTER GAIN

vs. FREQUENCY

0.5

0

TA = +125˚C

TA = +25˚C

-1

TA = -55˚C

-2 V+ = +5V

V- = -5V

fC CODE = 127 (25kHz TYP)

-3

25

100

1k

10k 25k

fIN (Hz)

4  

FILTER GAIN vs. FREQUENCY

(NORMALIZED TO CUTOFF FREQUENCY)

0

-20

-40

V+ = +5V

-60

V- = -5V

fC CODE = 0-127 (1-25kHz TYP)

TA = +25˚C

-80

0.1

1.0

10

100

fIN/fC

PASSBAND FILTER GAIN vs. FREQUENCY

(NORMALIZED TO CUTOFF FREQUENCY)

+0.5

0

V+ = +5V

-1 V- = -5V

fC CODE = 0-127 (1-25kHz TYP)

TA = +25˚C

-2

-3

0.001

0.01

0.1

1.0

fIN/fC

PASSBAND FILTER GAIN

vs. FREQUENCY

0.5

0

TA = +125˚C

TA = +25˚C

-1

TA = -55˚C

V+ = +5V

-2

V- = -5V

fC CODE = 0 (1kHz TYP)

-3

1

10

100

1k

fIN/fC

FILTER PHASE SHIFT vs. FREQUENCY

(NORMALIZED TO CUTOFF FREQUENCY)

0

-45

-90

V+ = +5V

V- = -5V

fC CODE = 0-127

(1-25kHz TYP)

-135 TA = +25˚C

-180

0.01

0.1

1.0

10

fIN/fC

Maxim Integrated

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