MAX7426 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

19-1710; Rev 0; 4/00
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
General Description
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
Applications
CT2 Base Stations
Speech Processing
Selector Guide
PART TRANSITION RATIO
MAX7426
MAX7427
r = 1.25
r = 1.25
OPERATING
VOLTAGE (V)
+5
+3
Features
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
+5V (MAX7426)
+3V (MAX7427)
o Low Power
0.8mA (Operating Mode)
0.2µA (Shutdown Mode)
o Available in 8-Pin µMAX/PDIP Packages
o Low Output Offset: ±4mV
PART
MAX7426CUA
MAX7426CPA
MAX7426EUA
MAX7426EPA
MAX7427CUA
MAX7427CPA
MAX7427EUA
MAX7427EPA
Ordering Information
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
8 µMAX
8 Plastic DIP
Typical Operating Circuit
V_SUPPLY
0.1µF
INPUT
CLOCK
V_DD
SHDN
IN
OUT
MAX7426
MAX7427
CLK
COM
OS
GND
OUTPUT
0.1µF
Pin Configuration
TOP VIEW
COM 1
IN 2
GND 3
V_DD 4
MAX7426
MAX7427
8 CLK
7 SHDN
6 OS
5 OUT
µMAX/PDIP
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