MAX7401 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 8th-Order, Lowpass, Bessel, Switched-Capacitor Filters

19-4788; Rev 1; 6/99
8th-Order, Lowpass, Bessel,
Switched-Capacitor Filters
General Description
The MAX7401/MAX7405 8th-order, lowpass, Bessel,
switched-capacitor filters (SCFs) operate from a single
+5V (MAX7401) or +3V (MAX7405) supply. These
devices draw only 2mA of supply current and allow cor-
ner frequencies from 1Hz to 5kHz, making them ideal
for low-power post-DAC filtering and anti-aliasing appli-
cations. They feature a shutdown mode that reduces
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 MAX7401/MAX7405 Bessel filters provide low over-
shoot and fast settling. Their fixed response simplifies
the design task to selecting a clock frequency.
ADC Anti-Aliasing
Post-DAC Filtering
Air-Bag Electronics
Applications
CT2 Base Stations
Speech Processing
TOP VIEW
Pin Configuration
Features
o 8th-Order, Lowpass Bessel Filters
o Low Noise and Distortion: -82dB THD + Noise
o Clock-Tunable Corner Frequency (1Hz to 5kHz)
o 100:1 Clock-to-Corner Ratio
o Single-Supply Operation
+5V (MAX7401)
+3V (MAX7405)
o Low Power
2mA (Operating Mode)
0.2µA (Shutdown Mode)
o Available in 8-Pin SO/DIP Packages
o Low Output Offset: ±5mV
PART
MAX7401CSA
MAX7401CPA
MAX7401ESA
MAX7401EPA
MAX7405CSA
MAX7405CPA
MAX7405ESA
MAX7405EPA
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 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
COM 1
IN 2
GND 3
V_DD 4
MAX7401
MAX7405
8 CLK
7 SHDN
6 OS
5 OUT
SO/DIP
Typical Operating Circuit
V_SUPPLY
0.1µF
INPUT
CLOCK
V_DD
SHDN
IN
OUT
MAX7401
MAX7405
CLK
COM
OS
GND
OUTPUT
0.1µF
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