MAX7421EUA

Manufacturer Part NumberMAX7421EUA
DescriptionActive Filter
ManufacturerMaxim Integrated Products
MAX7421EUA datasheet
 


Specifications of MAX7421EUA

Number Of Channels1Cutoff Frequency30 KHz
Supply Voltage (max)5.5 VMaximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 CMounting StyleSMD/SMT
Operating Supply Voltage5 VSupply Voltage (min)4.5 V
Package / CaseuMAX-8Lead Free Status / RoHS StatusLead free / RoHS Compliant
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19-1821; Rev 0; 11/00
General Description
The MAX7418–MAX7425 5th-order, low-pass, switched-
capacitor filters (SCFs) operate from a single +5V
(MAX7418–MAX7421) or +3V (MAX7422–MAX7425)
supply. These devices draw only 3mA of supply current
and allow corner frequencies from 1Hz to 45kHz, mak-
ing them ideal for low-power post-DAC filtering and anti-
aliasing applications. They feature a shutdown mode
that reduces supply current to 0.2µA.
Two clocking options are available: 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 output level.
The MAX7418/MAX7422 deliver 53dB of stopband
rejection and a sharp rolloff with a 1.6 transition ratio.
The MAX7421/MAX7425 achieve a sharper rolloff with a
1.25 transition ratio while still providing 37dB of stop-
band rejection. The MAX7419/MAX7423 Bessel filters
provide low overshoot and fast settling, and the
MAX7420/MAX7424 Butterworth filters provide a maxi-
mally flat passband response. Their fixed response sim-
plifies the design task of selecting a clock frequency.
ADC Anti-Aliasing
CT2 Base Stations
DAC Postfiltering
Speech Processing
Selector Guide
PART
FILTER RESPONSE
MAX7418
r = 1.6
MAX7419
Bessel
MAX7420
Butterworth
MAX7421
r = 1.25
Selector Guide continued at end of data sheet.
Pin Configuration
TOP VIEW
COM
1
IN
2
MAX7418–
MAX7425
GND
3
V
4
DD
µMAX
________________________________________________________________ Maxim Integrated Products
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
5th-Order, Lowpass,
Switched-Capacitor Filters
o 5th-Order, Lowpass Filters
Elliptic Response (MAX7418/MAX7421/
MAX7422/MAX7425)
Bessel Response (MAX7419/MAX7423)
Butterworth Response (MAX7420/MAX7424)
o Clock-Turnable Corner Frequency (1Hz to 45kHz)
o Single-Supply Operation
+5V (MAX7418–MAX7421)
+3V (MAX7422–MAX7425)
o Low Power
3mA (Operating Mode)
0.2µA (Shutdown Mode)
o Available in 8-Pin µMAX Package
o Low Output Offset: ±4mV
PART
MAX7418CUA
Applications
MAX7418EUA
MAX7419CUA
MAX7419EUA
MAX7420CUA
MAX7420EUA
MAX7421CUA
OPERATING
MAX7421EUA
VOLTAGE (V)
Ordering Information continued at end of data sheet.
+5
+5
+5
+5
V
0.1µF
INPUT
8
CLK
7
SHDN
CLOCK
6
OS
5
OUT
Features
Ordering Information
TEMP. RANGE
PIN-PACKAGE
0°C to +70°C
8 µMAX
-40°C to +85°C
8 µMAX
0°C to +70°C
8 µMAX
-40°C to +85°C
8 µMAX
0°C to +70°C
8 µMAX
-40°C to +85°C
8 µMAX
0°C to +70°C
8 µMAX
-40°C to +85°C
8 µMAX
Typical Operating Circuit
SUPPLY
V
DD
SHDN
IN
OUT
OUTPUT
MAX7418–
MAX7425
CLK
COM
OS
GND
0.1µF
1

MAX7421EUA Summary of contents

  • Page 1

    ... Low Power 3mA (Operating Mode) 0.2µA (Shutdown Mode) o Available in 8-Pin µMAX Package o Low Output Offset: ±4mV PART MAX7418CUA Applications MAX7418EUA MAX7419CUA MAX7419EUA MAX7420CUA MAX7420EUA MAX7421CUA OPERATING MAX7421EUA VOLTAGE (V) Ordering Information continued at end of data sheet 0.1µF INPUT 8 CLK 7 SHDN CLOCK ...

  • Page 2

    Lowpass, Switched-Capacitor Filters ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD IN, OUT, COM, OS, CLK, SHDN ................-0. OUT Short-Circuit Duration.......................................................1s Continuous Power Dissipation (T = +70°C) A 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW ...

  • Page 3

    ELECTRICAL CHARACTERISTICS—MAX7418–MAX7421 (continued +5V, filter output measured at OUT, 10kΩ || 50pF load to GND at OUT COM, 0.1µF capacitor from COM to GND, DD SHDN = 2.2MHz ...

  • Page 4

    Lowpass, Switched-Capacitor Filters ELECTRICAL CHARACTERISTICS—MAX7422–MAX7425 (continued +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT COM, 0.1µF capacitor from COM to GND, DD SHDN = ...

  • Page 5

    FILTER CHARACTERISTICS (V = +5V for MAX7418-MAX7420 OUT, SHDN = 2.2MHz CLK A PARAMETER ELLIPTIC 1.2—MAX7421/MAX7425 f = 0.38f 0.68f 0.87f ...

  • Page 6

    Lowpass, Switched-Capacitor Filters __________________________________________Typical Operating Characteristics (V = +5V for MAX7418–MAX7421 +25°C; unless otherwise noted.) A MAX7418/MAX7422 FREQUENCY RESPONSE (ELLIPTIC 1. -10 -20 -30 -40 -50 -60 -70 -80 -90 ...

  • Page 7

    Operating Characteristics (continued +5V for MAX7418–MAX7421 +25°C; unless otherwise noted.) A MAX7419/MAX7423 PHASE RESPONSE (BESSEL) 0 -50 -100 -150 -200 -250 INPUT FREQUENCY (kHz) MAX7418 ...

  • Page 8

    Lowpass, Switched-Capacitor Filters ____________________________Typical Operating Characteristics (continued +5V for MAX7418–MAX7421 +25°C; unless otherwise noted.) A MAX7424 THD + NOISE vs. INPUT SIGNAL AMPLITUDE (BUTTERWORTH) 0 SEE TABLE A -10 -20 -30 -40 ...

  • Page 9

    MAX7418–MAX7421 +25°C; unless otherwise noted OFFSET VOLTAGE vs. TEMPERATURE 3.0 2.5 2.0 1.5 1 0.5 0 -40 - TEMPERATURE (°C) PIN NAME Common Input ...

  • Page 10

    Lowpass, Switched-Capacitor Filters Figure 1. 5th-Order Ladder Filter Network An SCF that emulates a passive ladder filter retains many of the same advantages. The component sensi- tivity of a ...

  • Page 11

    200μs/div A: 1kHz INPUT SIGNAL B: MAX7419 BESSEL FILTER RESPONSE MAX7420 BUTTERWORTH FILTER RESPONSE; f Figure 3. Bessel vs. Butterworth Filter Response When using the internal oscillator, the capacitance ( CLK determines the ...

  • Page 12

    Lowpass, Switched-Capacitor Filters Characteristics table for the input voltage range of COM and OS. Changing the voltage on COM or OS signifi- cantly from midsupply reduces the dynamic range. The MAX7418–MAX7421 operate from a single +5V supply and the ...

  • Page 13

    Table 2. MAX7420/MAX7424 Typical Harmonic Distortion f CLK FILTER (MHz) 2.2 MAX7420 1.5 3.5 MAX7424 2.2 Table 3. MAX7419/MAX7423 Typical Harmonic Distortion f CLK FILTER (MHz) 2.2 MAX7419 1.5 3.5 MAX7423 2.2 Ordering Information (continued) PART TEMP. RANGE MAX7422CUA 0°C ...

  • Page 14

    ... 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products α ...