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MAX260AENG

Microprocessor Programmable Universal Active Filters

Maxim Integrated 

19-0352; Rev 2; 7/02

Microprocessor Programmable

Universal Active Filters

General Description

The MAX260/MAX261/MAX262 CMOS dual second-

order universal switched-capacitor active filters allow

microprocessor control of precise filter functions. No

external components are required for a variety of band-

pass, lowpass, highpass, notch, and allpass configura-

tions. Each device contains two second-order filter

sections that place center frequency, Q, and filter oper-

ating mode under programmed control.

An input clock, along with a 6-bit f0 program input,

determine the filter's center or corner frequency without

affecting other filter parameters. The filter Q is also pro-

grammed independently. Separate clock inputs for

each filter section operate with either a crystal, RC net-

work, or external clock generator.

The MAX260 has offset and DC specifications superior

to the MAX261 and MAX262 and a center frequency

(f0) range of 7.5kHz. The MAX261 handles center fre-

quencies to 57kHz, while the MAX262 extends the cen-

ter frequency range to 140kHz by employing lower

clock-to-f0 ratios. All devices are available in 24-pin DIP

and small outline packages in commercial, extended,

and military temperature ranges.

Applications

µP-Tuned Filters

Anti-Aliasing Filters

Digital Signal Processing

Adaptive Filters

Signal Analysis

Phase-Locked Loops

Functional Diagram

INPUT

+5V

V+

IN LP HP BP

FILTER

A

OUTPUT

IN LP HP BP

FILTER

B

GND

MAX260

-5V

V-

MAX261

MAX262

CLKA

OSC CLKOUT

CLKB

CRYSTAL

PROGRAM

INPUTS

FOURTH-ORDER BANDPASS FILTER

Features

o Filter Design Software Available

o Microprocessor Interface

o 64-Step Center Frequency Control

o 128-Step Q Control

o Independent Q and f0 Programming

o Guaranteed Clock to f0 Ratio-1% (A grade)

o 75kHz f0 Range (MAX262)

o Single +5V and ±5V Operation

Ordering Information

PART

TEMP RANGE PACKAGE ACCURACY

MAX260ACNG 0°C to +70°C Plastic DIP

1%

MAX260BCNG 0°C to +70°C Plastic DIP

2%

MAX260AENG -40°C to +85°C Plastic DIP

1%

MAX260BENG -40°C to +85°C Plastic DIP

2%

MAX260ACWG 0°C to +70°C Wide SO

1%

MAX260BCWG 0°C to +70°C Wide SO

2%

MAX260AMRG -55°C to +125°C CERDIP

1%

MAX260BMRG -55°C to +125°C CERDIP

2%

*All devices—24-pin packages 0.3in-wide packages

Ordering Information continued at end of data sheet.

Pin Configurations

TOP VIEW

BPA 1

N.C. 2

HPA 3

N.C. 4

INA 5

D1 6

A3 7

CLK OUT 8

V+ 9

A2 10

CLKA 11

CLKB 12

MAX260

24 LPA

BPA 1

23 INB

22 LPB

OP OUT 2

HPA 3

21 BPB

OP IN 4

20 D0

19 OSC OUT

INA 5

D1 6

18 GND

17 V-

A3 7

CLK OUT 8

16 WR

V+ 9

15 A0

A2 10

14 HPB

CLKA 11

13 A1

CLKB 12

MAX261

MAX262

24 LPA

23 INB

22 LPB

21 BPB

20 HPB

19 D0

18 OSC OUT

17 GND

16 V-

15 WR

14 A0

13 A1

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

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

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