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General Description

The MAX7408/MAX7411/MAX7412/MAX7415 5th-order,

lowpass, elliptic, switched-capacitor filters (SCFs) oper-

ate from a single +5V (MAX7408/MAX7411) or +3V

(MAX7412/MAX7415) supply. The 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

can be put into a low-power mode, reducing supply

current to 0.2µA.

Two clocking options are available: self-clocking (through

the use of an external capacitor) or external clocking for

tighter cutoff-frequency control. An offset-adjust pin

allows for adjustment of the DC output level.

The MAX7408/MAX7412 deliver 53dB of stopband

rejection and a sharp rolloff with a transition ratio of 1.6.

The MAX7411/MAX7415 achieve a sharper rolloff with a

transition ratio of 1.25 while still providing 37dB of stop-

band rejection. Their fixed response limits the design

task to selecting a clock frequency.

Applications

ADC Anti-Aliasing CT2 Base Stations

Post-DAC Filtering Speech Processing

Features

o 5th-Order, Elliptic Lowpass Filters

o Low Noise and Distortion: -80dB THD + Noise

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

o Single-Supply Operation

+5V (MAX7408/MAX7411)

+3V (MAX7412/MAX7415)

o Low Power

1.2mA (operating mode)

0.2µA (shutdown mode)

o Available in 8-Pin µMAX/DIP Packages

o Low Output Offset: ±4mV

MAX7408/MAX7411/MAX7412/MAX7415

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

________________________________________________________________

Maxim Integrated Products

OUTV

CLK

SHDNIN

GND

COM

µMAX/DIP

TOP VIEW

MAX7408

MAX7411

MAX7412

MAX7415

CLK

OUT

GND

INPUT

0.1µF

CLOCK

SHDN

OUTPUT

COM

MAX7408

MAX7411

MAX7412

MAX7415

SUPPLY

Typical Operating Circuit

19-1378; Rev 1; 10/98

Pin Configuration

Ordering Information

PART

MAX7408CPA

MAX7408CUA

MAX7408EPA -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP

8 µMAX

8 Plastic DIP

MAX7408EUA

MAX7415CPA

MAX7415CUA

MAX7415EPA -40°C to +85°C

0°C to +70°C

-40°C to +85°C 8 µMAX

8 Plastic DIP

8 µMAX

8 Plastic DIP

MAX7415EUA -40°C to +85°C 8 µMAX

PART

TRANSITION RATIO

OPERATING

VOLTAGE (V)

MAX7408 r = 1.6 +5

MAX7411 r = 1.25 +5

Selector Guide

MAX7412 r = 1.6 +3

MAX7415 r = 1.25 +3

MAX7411CPA

MAX7411CUA

MAX7411EPA -40°C to +85°C

0°C to +70°C

0°C to +70°C 8 Plastic DIP

8 µMAX

8 Plastic DIP

MAX7411EUA -40°C to +85°C 8 µMAX

MAX7412CPA

MAX7412CUA

MAX7412EPA -40°C to +85°C

0°C to +70°C

0°C to +70°C 8 Plastic DIP

8 µMAX

8 Plastic DIP

MAX7412EUA -40°C to +85°C 8 µMAX

EVALUATION KIT

AVAILABLE

Summary of content (12 pages)

PAGE 1
9-1378; Rev 1; 10/98 KIT ATION EVALU E L B AVAILA 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters Features The MAX7408/MAX7411/MAX7412/MAX7415 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7408/MAX7411) or +3V (MAX7412/MAX7415) supply. The 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.
PAGE 2
MAX7408/MAX7411/MAX7412/MAX7415 5th-Order, Lowpass, Elliptic, 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 6.90mW/°C above +70°C) ...............552mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............
PAGE 3
5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters (VDD = +5V; filter output measured at OUT, 10kΩ || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS 5.5 V POWER REQUIREMENTS Supply Voltage VDD Supply Current IDD 4.5 Operating mode, no load 1.16 1.5 mA Shutdown Current I SHDN SHDN = GND 0.
PAGE 4
MAX7408/MAX7411/MAX7412/MAX7415 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters ELECTRICAL CHARACTERISTICS—MAX7412/MAX7415 (continued) (VDD = +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to GND, fCLK = 100kHz; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
th-Order, Lowpass, Elliptic, Switched-Capacitor Filters (VDD = +5V for MAX7411, VDD = +3V for MAX7415; filter output measured at OUT; 10kΩ || 50pF load to GND at OUT; SHDN = VDD, VCOM = VOS = VDD / 2; fCLK = 100kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER CONDITIONS Insertion Gain with DC Gain Error Removed (Note 4) MIN TYP MAX fIN = 0.38fC -0.4 -0.2 0.4 fIN = 0.68fC -0.4 0.2 0.4 fIN = 0.87fC -0.4 -0.2 0.4 fIN = 0.97fC -0.4 0.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +5V for MAX7408/MAX7411, VDD = +3V for MAX7412/MAX7415; fCLK = 100kHz; SHDN = VDD; VCOM = VOS = VDD / 2; TA = +25°C; unless otherwise noted.) MAX7411/MAX7415 MAX7408/MAX7412 MAX7411/MAX7415 PHASE RESPONSE PHASE RESPONSE PASSBAND FREQUENCY RESPONSE -0.8 -1.0 fC = 1kHz r = 1.25 -200 -250 -300 204 408 612 816 0 1.02k 0.2 0.8 1.0 1.2 1.4 1.14 1.13 1.12 1.11 3.0 3.5 4.0 4.5 5.0 5.5 0.4 0.6 MAX7408/11-08 1.16 1.15 1.14 VDD = +3V 1.
PAGE 7
5th-Order, Lowpass, Elliptic, Switched-Capacitor MAX7412 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT SIGNAL AMPLITUDE THD + NOISE (dB) -20 -30 -40 -50 -60 -70 SEE TABLE A -10 -30 -40 -50 -60 B B -70 B -80 A -80 A 0 0.5 1.0 1.5 A -90 2.0 2.5 3.0 0 0.5 AMPLITUDE (Vp-p) INTERNAL OSCILLATOR PERIOD vs. LARGE CAPACITANCE (in nF) 60 40 8 MAX7408/11-14 VDD = +3V 6 4 20 2 0 0 500 2.5 3.0 27.4 27.3 27.2 27.1 27.0 26.9 26.8 COSC = 1000pF 26.7 26.
PAGE 8
MAX7408/MAX7411/MAX7412/MAX7415 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters Pin Description PIN NAME FUNCTION 1 COM 2 IN 3 GND Ground 4 VDD Positive Supply Input, +5V for MAX7408/MAX7411 or +3V for MAX7412/MAX7415 5 OUT Filter Output 6 OS Offset Adjust Input. To adjust output offset, bias OS with a resistive voltage-divider between an external supply and ground. Connect OS to COM if no offset adjustment is needed. 7 SHDN Shutdown Input.
PAGE 9
5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters 0.1µF fC VDD f TRANSITION RATIO = S fC GAIN (dB) INPUT SHDN OUT IN 0.1µF fS CLOCK PASSBAND MAX7408 MAX7411 MAX7412 MAX7415 CLK fS 50k 50k OS 0.1µF GND STOPBAND fC OUTPUT COM 50k FREQUENCY Figure 2. Elliptic Filter Response Figure 3. Offset Adjustment Circuit Clock Signal External Clock These SCFs are designed for use with external clocks that have a 40% to 60% duty cycle.
PAGE 10
MAX7408/MAX7411/MAX7412/MAX7415 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters Characteristics table for the input voltage range of COM and OS. Changing the voltage on COM or OS significantly from mid-supply reduces the dynamic range. V+ Power Supplies The MAX7408/MAX7411 operate from a single +5V supply and the MAX7412/MAX7415 operate from a single +3V supply. Bypass V DD to GND with a 0.1µF capacitor.
PAGE 11
5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters TRANSISTOR COUNT: 1457 ________________________________________________________Package Information α α ______________________________________________________________________________________ 11 MAX7408/MAX7411/MAX7412/MAX7415 Chip Information
PAGE 12
MAX7408/MAX7411/MAX7412/MAX7415 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters PDIPN.EPS 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.