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MAX270EWP
(Rev.:2012)

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

Maxim Integrated 

MAX270/MAX271

Digitally-Programmed, Dual

2nd-Order Continuous Lowpass Filter

General Description

The MAX270/MAX271 are digitally-programmed, dual

second-order continuous-time lowpass filters. Their typi-

cal dynamic range of 96dB surpasses most switched

capacitor filters which require additional filtering to

remove clock noise. The MAX270/MAX271 are ideal for

anti-aliasing and DAC smoothing applications and can

be cascaded for higher-order responses.

The two filter sections are independently programmable

by either microprocessor (FP) control or pin strapping.

Cutoff frequencies in the 1kHz to 25kHz range can be

selected.

The MAX270 has an on-board, uncommitted op amp,

while the MAX271 has an internal track-and-hold (T/H).

Applications

Lowpass Filtering

Anti-Aliasing Filter

Output Smoothing

Low-Noise Applications

Anti-Aliasing and Track-and-Hold (MAX271)

Typical Operating Circuit

+5V

-5V

V+

GND

V-

IN INA

FILTER A

ANTI-ALIASING

OUTA

A/D WITH

T/H

MAX270

DSB

OUT OUTB

FILTER B

INB

DAC

ANTI-ALIASING

AO D0-D6

CS WR

µP OR PIN-STRAP CONTROL

Features

S Continuous-Time Filtering - No Clock Required

S Dual 2nd-Order Lowpass Filters

S Sections Independently Programmable: 1kHz to

25kHz

S 96dB Dynamic Range

S No External Components

S Cascadable for Higher Order

S Low-Power Shutdown Mode

S Track-and-Hold (MAX271)

Ordering Information

PART

MAX270CPP

MAX270CWP

MAX270EPP

MAX270EWP

MAX271CNG

MAX271CWG

MAX271ENG

MAX271EWG

TEMP RANGE

0NC to +70NC

0NC to +70NC

-40NC to +85NC

-40NC to +85NC

0NC to +70NC

0NC to +70NC

-40NC to +85NC

-40NC to +85NC

PIN-PACKAGE

20 PDIP

20 Wide SO

20 PDIP

20 Wide SO

20 PDIP

20 Wide SO

20 PDIP

20 Wide SO

Devices are available in a lead(Pb)-free/RoHS-compliant package.

Specify lead-free by adding a plus (+) to the part number when

ordering.

Pin Configurations

TOP VIEW

Pin Configurations

continued at end

of data sheet.

1 OP OUT

OP IN 20

2 V+

D6 19

3 OUTA

D5 18

4 SHDN

D4 17

MAX270

5 INA

D3 16

6 V-

D2 15

7 INB

D1 14

8 OUTB

D0 13

9 GND

A0 12

10 WR

CS 11

PDIP/SO(W)

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-3701; Rev 2; 1/12

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