Datasheet

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General Description

The MAX7409/MAX7410/MAX7413/MAX7414 5th-order,

lowpass, switched-capacitor filters (SCFs) operate from

a single +5V (MAX7409/MAX7410) or +3V (MAX7413/

MAX7414) supply. These devices draw only 1.2mA of

supply current and allow corner frequencies from 1Hz

to 15kHz, making them ideal for low-power post-DAC

filtering and anti-aliasing applications. They feature a

shutdown mode, which reduces the supply current to

0.2µA.

Two clocking options are available on these devices:

self-clocking (through the use of an external capacitor)

or external clocking for tighter corner-frequency control.

An offset adjust pin allows for adjustment of the DC out-

put level.

The MAX7409/MAX7413 Bessel filters provide low over-

shoot and fast settling, while the MAX7410/MAX7414

Butterworth filters provide a maximally flat passband

response. Their fixed response simplifies the design

task to selecting a clock frequency.

Applications

ADC Anti-Aliasing CT2 Base Stations

DAC Postfiltering Speech Processing

Air-Bag Electronics

Features

♦ 5th-Order Lowpass Filters

Bessel Response (MAX7409/MAX7413)

Butterworth Response (MAX7410/MAX7414)

♦ Clock-Tunable Corner Frequency (1Hz to 15kHz)

♦ Single-Supply Operation

+5V (MAX7409/MAX7410)

+3V (MAX7413/MAX7414)

♦ Low Power

1.2mA (operating mode)

0.2µA (shutdown mode)

♦ Available in 8-Pin µMAX/DIP Packages

♦ Low Output Offset: ±4mV

MAX7409/MAX7410/MAX7413/MAX7414

5th-Order, Lowpass,

Switched-Capacitor Filters

________________________________________________________________

Maxim Integrated Products

OUTV

CLK

SHDNIN

GND

COM

µMAX/DIP

TOP VIEW

MAX7409

MAX7410

MAX7413

MAX7414

CLK

OUT

GND

INPUT

0.1µF

CLOCK

SHDN

OUTPUT

SUPPLY

COM

MAX7409

MAX7410

MAX7413

MAX7414

Typical Operating Circuit

19-4766; Rev 1; 9/98

Pin Configuration

Ordering Information

PART FILTER RESPONSE

OPERATING

VOLTAGE (V)

MAX7409 Bessel +5

MAX7410 Butterworth +5

Selector Guide

PART

MAX7409CPA

MAX7409EUA

MAX7409EPA -40°C to +85°C

-40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP

8 µMAX

8 Plastic DIP

MAX7410CUA

MAX7410CPA

MAX7410EUA

MAX7410EPA -40°C to +85°C

-40°C to +85°C

0°C to +70°C

0°C to +70°C 8 µMAX

8 Plastic DIP

8 µMAX

8 Plastic DIP

Ordering Information continued at end of data sheet.

MAX7413 Bessel +3

MAX7414 Butterworth +3

MAX7409CUA

0°C to +70°C 8 µMAX

Summary of content (12 pages)

PAGE 1
9-4766; Rev 1; 9/98 5th-Order, Lowpass, Switched-Capacitor Filters Features The MAX7409/MAX7410/MAX7413/MAX7414 5th-order, lowpass, switched-capacitor filters (SCFs) operate from a single +5V (MAX7409/MAX7410) or +3V (MAX7413/ MAX7414) supply. These devices draw only 1.2mA of supply current and allow corner frequencies from 1Hz to 15kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They feature a shutdown mode, which reduces the supply current to 0.2µA.
PAGE 2
MAX7409/MAX7410/MAX7413/MAX7414 5th-Order, Lowpass, Switched-Capacitor Filters ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V IN, OUT, COM, OS, CLK, SHDN ................-0.3V to (VDD + 0.3V) OUT Short-Circuit Duration...................................................1sec Continuous Power Dissipation (TA = +70°C) 8-Pin DIP (derate 9.09mW/°C above +70°C) ...............727mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............
PAGE 3
5th-Order, Lowpass, Switched-Capacitor Filters (VDD = +5V, filter output measured at OUT, 10kΩ || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN UNITS TYP MAX 5.5 V Operating mode, no load 1.2 1.5 mA 1 POWER REQUIREMENTS Supply Voltage VDD Supply Current IDD 4.5 Shutdown Current I SHDN SHDN = GND 0.
PAGE 4
MAX7409/MAX7410/MAX7413/MAX7414 5th-Order, Lowpass, Switched-Capacitor Filters ELECTRICAL CHARACTERISTICS—MAX7413/MAX7414 (continued) (VDD = +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 21 30 38 kHz ±13.
PAGE 5
th-Order, Lowpass, Switched-Capacitor Filters (VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, fCLK = 100kHz, SHDN = VDD, COM = OS = VDD / 2, TA = +25°C, unless otherwise noted.) MAX7410/MAX7414 FREQUENCY RESPONSE (BUTTERWORTH) fC = 1kHz 0 fC = 1kHz -0.8 -16 -20 -1.2 -30 -1.6 -32 -40 -2.0 -40 -50 -2.4 -48 -60 -3.0 -70 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -3.2 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, fCLK = 100kHz, SHDN = VDD, COM = OS = VDD / 2, TA = +25°C, unless otherwise noted.) -20 -50 -60 B -70 -80 A -90 0 -40 -50 B -30 -40 -50 -60 -70 -70 -80 -80 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 B A A -90 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.5 1.0 1.5 2.0 2.5 AMPLITUDE (Vp-p) AMPLITUDE (Vp-p) AMPLITUDE (Vp-p) MAX7414 TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 7
5th-Order, Lowpass, Switched-Capacitor Filters (VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, fCLK = 100kHz, SHDN = VDD, COM = OS = VDD / 2, TA = +25°C, unless otherwise noted.) OUTPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE OUTPUT OFFSET VOLTAGE vs. TEMPERATURE VDD = +3V -3.50 -3.75 VDD = +5V -4.00 MAX7409 toc18 -2.5 DC OFFSET VOLTAGE (mV) -3.25 OFFSET VOLTAGE (mV) -2.0 MAX7409 toc17 -3.00 -3.0 -3.5 -4.0 -4.5 -4.25 -5.0 -4.50 -40 -20 0 20 40 60 80 2.5 100 3.0 3.5 4.0 4.
PAGE 8
MAX7409/MAX7410/MAX7413/MAX7414 5th-Order, Lowpass, Switched-Capacitor Filters RS 2V/div + - VIN L2 C1 L4 C3 C5 RL A 2V/div B 2V/div Figure 2. 5th-Order Ladder Filter Network C Clock Signal 200µs/div A: 1kHz INPUT SIGNAL B: MAX7409 BESSEL FILTER RESPONSE; fC = 5kHz C: MAX7410 BUTTERWORTH FILTER RESPONSE; fC = 5kHz Figure 1. Bessel vs.
PAGE 9
5th-Order, Lowpass, Switched-Capacitor Filters VSUPPLY 0.1µF VDD INPUT __________Applications Information SHDN OUT IN OUTPUT COM 0.1µF MAX7409 MAX7410 MAX7413 MAX7414 Offset and Common-Mode Input Adjustment The COM pin sets the common-mode input voltage and is biased at mid-supply with an internal resistor-divider. If the application does not require offset adjustment, connect OS to COM.
PAGE 10
MAX7409/MAX7410/MAX7413/MAX7414 5th-Order, Lowpass, Switched-Capacitor Filters Table 1. MAX7410/MAX7414 Typical Harmonic Distortion FILTER fCLK (kHz) fIN (Hz) 500 1k 100 200 500 1k MAX7410 VIN (Vp-p) TYPICAL HARMONIC DISTORTION (dB) 2nd 3rd 4th -85 -67 -86.7 -82 -84 -78 -88.7 -88.5 -85.3 -74 -87.1 -87.6 -86.1 -85.5 -85.8 -86.4 5th 4 MAX7414 2 100 200 Table 2.
PAGE 11
5th-Order, Lowpass, Switched-Capacitor Filters 8LUMAXD.
PAGE 12
5th-Order, Lowpass, Switched-Capacitor Filters PDIPN.EPS MAX7409/MAX7410/MAX7413/MAX7414 Package Information (continued) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.