MAX7427CUA+ Maxim Integrated Products, MAX7427CUA+ Datasheet

IC FILTER LOWPASS 5TH 8UMAX

MAX7427CUA+

Manufacturer Part Number
MAX7427CUA+
Description
IC FILTER LOWPASS 5TH 8UMAX
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX7427CUA+

Filter Type
Elliptic, Lowpass Switched Capacitor
Frequency - Cutoff Or Center
12kHz
Number Of Filters
1
Max-order
5th
Voltage - Supply
2.7 V ~ 3.6 V
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX7426/MAX7427 5th-order, lowpass, elliptic,
switched-capacitor filters (SCFs) operate from a single
+5V (MAX7426) or +3V (MAX7427) supply. The devices
draw only 0.8mA of supply current and allow corner fre-
quencies from 1Hz to 12kHz, making them ideal for
low-power post-DAC filtering and anti-aliasing applica-
tions. 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 MAX7426/MAX7427 deliver 37dB of stopband
rejection and a sharp rolloff with a transition ratio of
1.25. Their fixed response limits the design task to
selecting a clock frequency.
ADC Anti-Aliasing
Post-DAC Filtering
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.
19-1710; Rev 0; 4/00
MAX7426
MAX7427
PART
CLOCK
0.1µF
INPUT
V
SUPPLY
TRANSITION RATIO
Typical Operating Circuit
IN
CLK
________________________________________________________________ Maxim Integrated Products
r = 1.25
r = 1.25
MAX7426
MAX7427
General Description
V
GND
DD
CT2 Base Stations
Speech Processing
Selector Guide
SHDN
COM
OUT
OS
Applications
VOLTAGE (V)
OPERATING
OUTPUT
+5
+3
0.1µF
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
o 5th-Order, Elliptic Lowpass Filters
o Low Noise and Distortion: -80dB THD + Noise
o Clock-Tunable Corner Frequency (1Hz to 12kHz)
o Single-Supply Operation
o Low Power
o Available in 8-Pin µMAX/PDIP Packages
o Low Output Offset: ±4mV
MAX7426CUA
MAX7426CPA
MAX7426EUA
MAX7426EPA
MAX7427CUA
MAX7427CPA
MAX7427EUA
MAX7427EPA
TOP VIEW
+5V (MAX7426)
+3V (MAX7427)
0.8mA (Operating Mode)
0.2µA (Shutdown Mode)
PART
COM
GND
V
DD
IN
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
1
2
4
3
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
µMAX/PDIP
MAX7426
MAX7427
Pin Configuration
6
8
7
5
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
PIN-PACKAGE
CLK
SHDN
OS
OUT
Features
1

Related parts for MAX7427CUA+

MAX7427CUA+ Summary of contents

Page 1

... MAX7427 CLOCK CLK COM OS GND ________________________________________________________________ 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, Elliptic, Switched-Capacitor Filters o 5th-Order, Elliptic Lowpass Filters o Low Noise and Distortion: -80dB THD + Noise ...

Page 2

Lowpass, Elliptic, 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) ...

Page 3

ELECTRICAL CHARACTERISTICS—MAX7426 (continued +5V, filter output measured at OUT, 10kΩ 100kHz unless otherwise noted. Typical values are at T CLK A MIN MAX PARAMETER SYMBOL POWER REQUIREMENTS Supply Voltage ...

Page 4

Lowpass, Elliptic, Switched-Capacitor Filters ELECTRICAL CHARACTERISTICS—MAX7427 (continued +3V, filter output measured at OUT pin, 10kΩ DD GND 100kHz unless otherwise noted. Typical values are at T CLK A MIN ...

Page 5

MAX7426 +3V for MAX7427 wise noted.) FREQUENCY RESPONSE 1kHz 1.25 -10 -20 -30 -40 -50 -60 - INPUT FREQUENCY ...

Page 6

Lowpass, Elliptic, Switched-Capacitor Filters (V = +5V for MAX7426 +3V for MAX7427 wise noted.) MAX7426 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT SIGNAL AMPLITUDE 0 SEE TABLE 1. -10 -20 -30 -40 -50 -60 ...

Page 7

MAX7426 +3V for MAX7427 wise noted.) INTERNAL OSCILLATOR PERIOD vs. SMALL CAPACITANCE (IN pF) 200 V DD 150 100 500 1000 1500 2000 CAPACITANCE (pF) INTERNAL OSCILLATOR FREQUENCY ...

Page 8

Lowpass, Elliptic, Switched-Capacitor Filters PIN NAME Common Input Pin. Biased internally at midsupply. Bypass externally to GND with a 0.1µF capacitor COM override internal biasing, drive with an external supply Filter Input 3 GND Ground ...

Page 9

RIPPLE f C TRANSITION RATIO = f S PASSBAND Figure 2. Elliptic Filter Response powered from Varying the rate of the external DD clock adjusts the corner frequency of the filter: f ...

Page 10

Lowpass, Elliptic, Switched-Capacitor Filters SHDN OUT INPUT IN COM MAX7426 MAX7427 V+ CLOCK CLK OS V- GND V- *CONNECT SHDN TO V- FOR LOW-POWER SHUTDOWN MODE. Figure 4. Dual-Supply Operation Characteristics table for the input voltage ...

Page 11

Information ______________________________________________________________________________________ 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters 11 ...

Page 12

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

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