Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX296ESA+

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

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

General Description

The MAX291/MAX292/MAX295/MAX296 are easy-to-use,

8th-order, lowpass, switched-capacitor filters that can be

set up with corner frequencies from 0.1Hz to 25kHz

(MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296).

The MAX291/MAX295 Butterworth filters provide maxi-

mally flat passband response, and the MAX292/MAX296

Bessel filters provide low overshoot and fast settling. All

four filters have fixed responses, so the design task is

limited to selecting the clock frequency that controls the

filter’s corner frequency.

An external capacitor is used to generate a clock using

the internal oscillator, or an external clock signal can be

used. An uncommitted operational amplifier (noninverting

input grounded) is provided for building a continuous-

time lowpass filter for post-filtering or anti-aliasing.

Produced in an 8-pin DIP/SO and a 16-pin wide SO

package, and requiring a minimum of external compo-

nents, the MAX291 series delivers very aggressive per-

formance from a tiny area.

Applications

ADC Anti-Aliasing Filter

Noise Analysis

DAC Post-Filtering

50Hz/60Hz Line-Noise Filtering

Features

o 8th-Order Lowpass Filters:

Butterworth (MAX291/MAX295)

Bessel (MAX292/MAX296)

o Clock-Tunable Corner-Frequency Range:

0.1Hz to 25kHz (MAX291/MAX292)

0.1Hz to 50kHz (MAX295/MAX296)

o No External Resistors or Capacitors Required

o Internal or External Clock

o Clock to Corner Frequency Ratio:

100:1 (MAX291/MAX292)

50:1 (MAX295/MAX296)

o Low Noise: -70dB THD + Noise (Typ)

o Operate with a Single +5V Supply or

Dual ±5V Supplies

o Uncommitted Op Amp for Anti-Aliasing or Clock-

Noise Filtering

o 8-Pin DIP and SO Packages

8th-Order, Lowpass,

Switched-Capacitor Filters

Ordering Information

Pin Configurations

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883.

PART TEMP. RANGE PIN-PACKAGE

MAX291CPA

MAX291CWE

0°C to +70°C 8 Plastic DIP

MAX291C/D 0°C to +70°C

0°C to +70°C 16 Wide SO

Dice*

MAX291EPA -40°C to +85°C 8 Plastic DIP

MAX291EWE

MAX291MJA -55°C to +125°C

-40°C to +85°C 16 Wide SO

8 CERDIP**

GND

OP OUT

OUT

OP IN-

V+

V-

CLK

MAX29_

DIP/SO

TOP VIEW

16-pin Wide SO at end of data sheet.

MAX291CSA 0°C to +70°C 8 SO

MAX291ESA -40°C to +85°C 8 SO

+5V

-5V

V+

V-

CLOCK CLK

OP IN-

OP OUT

OUT OUTPUT

INPUT IN

MAX29_

Typical Operating Circuit

Pin Configuration is 8-pin DIP/SO.

19-4526; Rev 5; 5/10

MAX291/MAX292/

MAX295/MAX296

Summary of content (10 pages)

PAGE 1
MAX291/MAX292/ MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters LE AVAILAB General Description The MAX291/MAX292/MAX295/MAX296 are easy-to-use, 8th-order, lowpass, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296). The MAX291/MAX295 Butterworth filters provide maximally flat passband response, and the MAX292/MAX296 Bessel filters provide low overshoot and fast settling.
PAGE 2
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters ABSOLUTE MAXIMUM RATINGS Supply Voltage (V+ to V-).......................................................12V Input Voltage at Any Pin.............V- + (-0.3V) ≤ VIN ≤ V+ + (0.3V) Continuous Power Dissipation 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C) ....762mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C)........
PAGE 3
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V, V- = -5V, filter output measured at OUT pin, 20kΩ load resistor to ground at OUT and OP OUT, fCLK = 100kHz (MAX291/MAX292) or fCLK = 50kHz (MAX295/MAX296), TA = TMIN to TMAX, unless otherwise noted.) PARAMETER CONDITIONS Output DC Swing Output Offset Voltage MIN TYP MAX UNITS ±150 ±400 V mV 0 -0.15 dB ±4 IN = GND DC Insertion Gain Error with Output Offset Removed 0.
PAGE 4
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters Typical Operating Characteristics (continued) (V+ = 5V, V- = -5V, TA = +25°C, fCLK = 100kHz (MAX291/MAX292) or fCLK = 50kHz (MAX295/MAX296), unless otherwise noted.) MAX295 GAIN (dB) GAIN (dB) -0.3 -0.4 -20 -20 -40 -40 -60 Fo = 1kHz 0 GAIN (dB) MAX291 Fo = 1kHz 0 20 MAX291/2/5/6-05 Fo = 1kHz -0.2 20 MAX291/2/5/6-04 0 -0.
PAGE 5
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters Typical Operating Characteristics (continued) (V+ = 5V, V- = -5V, RLOAD = 5kΩ, TA = +25°C, unless otherwise noted.) -4 FC = 2kHz -12 -16 -16 -20 -20 -24 -24 FC = 20kHz 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 B: fCLK = 1MHz Fo = 1kHz INPUT FREQ. = 1kHz MEAS. BANDWIDTH = 80kHz -55 -60 A -65 -70 FC = 1kHz -75 -28 -28 A: fCLK = 200kHz Fo = 2kHz INPUT FREQ. = 200Hz MEAS.
PAGE 6
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters _____________________Pin Description 16-PIN NAME FUNCTION 1, 2, 7, 8, 9, 10, 15, 16 N.C. No Connect 1 3 CLK Clock Input. Use internal or external clock. 2 4 V- Negative Supply pin. Dual supplies: -2.375V to -5.500V. Single supplies: V- = 0V. 3 5 OP OUT Uncommitted Op-Amp Output 4 6 OP IN- Inverting Input to the uncommitted op amp. The noninverting op amp is internally tied to ground.
PAGE 7
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters +5V 7 R1 L1 L3 L5 L7 +5V 1 3 0V C2 C4 C6 C8 4 R2 VIN VO +1V TO +4V INPUT SIGNAL RANGE 8 V+ CLK OUT OP OUT GND IN OUTPUT 0.1µF MAX29_ OP IN- 5 10k 6 V- 10k 2 0.1µF 0V Pin Configuration is 8-pin DIP. Figure 2. 8th-Order Ladder Filter Network Figure 3. +5V Single-Supply Operation error on its respective poles, while the same mismatch in a ladder filter design will spread its error over all poles.
PAGE 8
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters _Ordering Information (continued) 22k R2 22k R1 INPUT C1 330pF 22k R3 4 OP IN OUTPUT 3 C2 1500pF OP OUT MAX29_ Pin Configuration is 8-pin DIP/SO. Figure 4. Uncommitted Op Amp Configured as a 2nd-Order Butterworth Lowpass Filter (Fo = 10kHz) order continuous lowpass filter. This filter is convenient for anti-aliasing applications, or for clock noise attenuation at the switched-capacitor filter’s output.
PAGE 9
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters ____Pin Configurations (continued) TOP VIEW N.C. 1 16 N.C. N.C. 2 15 N.C. CLK 3 14 IN V- 4 MAX29_ 13 V+ OP OUT 5 12 GND OP IN- 6 11 OUT N.C. 7 10 N.C. N.C. 8 9 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 10
MAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters Revision History REVISION NUMBER REVISION DATE 3 12/97 — — 4 4/09 Added MAX292 to Ordering Information table and added new Package Information section 8 5 5/10 Changed voltage range in Figure 7 7 DESCRIPTION PAGES CHANGED Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.