MAX7401：8th-Order, Lowpass, Bessel, Switched-Capacitor Filters

Smallest, Lowest-Power 8th-Order Bessel Filters

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 corner frequencies from 1Hz to 5kHz, making 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 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 output level. The MAX7401/MAX7405 Bessel filters provide low overshoot and fast settling. Their fixed response simplifies the design task to selecting a clock frequency.

Key Features

8th-Order, Lowpass Bessel Filters
Low Noise and Distortion: -82dB THD + Noise
Clock-Tunable Corner Frequency (1Hz to 5kHz)
100:1 Clock-to-Corner Ratio
Single-Supply Operation
- +5V (MAX7401)
- +3V (MAX7405)
Low Power
- 2mA (Operating Mode)
- 0.2µA (Shutdown Mode)
Available in 8-Pin SO/DIP Packages
Low Output Offset: ±5mV

MAX7401, MAX7405: Typical Operating Circuit

Applications/Uses

ADC Anti-Aliasing
Air-Bag Electronics
CT2 Base Stations
Post-DAC Filtering
Speech Processing

DataSheet

title	Download file
MAX7401-MAX7405 Data Sheet	MAX7401-MAX7405.pdf

Parametrics

Part Number	Filter Sections	Order Per Filter Section	Filter Class	Filter Type	Filter Characteristic	Program Method	Lowest Cutoff (Hz)	Highest Cutoff (kHz)	V_SUPPLY (V)	Design Tools	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Filter Sections	Order Per Filter Section	Filter Class	Filter Type	Filter Characteristic	Program Method	max	min	V_SUPPLY (V)	Design Tools	Oper. Temp. (°C)	Package/Pins	See Notes
MAX7401	1	8	Switched Cap	Lowpass	Bessel	Clock	1	5	5	EE-Sim	-40 to +85 0 to +70	PDIP(N)/8 SOIC(N)/8	$2.84 @1k
MAX7405	1	8	Switched Cap	Lowpass	Bessel	Clock	1	5	3	EE-Sim	-40 to +85 0 to +70	PDIP(N)/8 SOIC(N)/8	$3.16 @1k

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX7401CPA	No Longer Available	MAX7401CPA+	PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	No
MAX7401CPA+	Active		PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	Lead Free
MAX7401CSA	No Longer Available	MAX7401CSA+	SOIC(N),;8 pin;30.9 mm²	0°C to +70°C	No
MAX7401CSA+	Active		SOIC(N),;8 pin;30.9 mm²	0°C to +70°C	Lead Free
MAX7401CSA+T	Active		SOIC(N),;8 pin;30.9 mm²	0°C to +70°C	Lead Free
MAX7401CSA-T	No Longer Available	MAX7401CSA+T	N.SO;8 pin	0°C to +70°C	See data sheet
MAX7401EPA	No Longer Available	MAX7401EPA+	PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	No
MAX7401EPA+	Active		PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	Lead Free
MAX7401ESA	No Longer Available	MAX7401ESA+	SOIC(N),;8 pin;30.9 mm²	-40°C to +85°C	No
MAX7401ESA+	Active		SOIC(N),;8 pin;30.9 mm²	-40°C to +85°C	Lead Free
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX7401ESA+T	Active		SOIC(N),;8 pin;30.9 mm²	-40°C to +85°C	Lead Free
MAX7401ESA-T	No Longer Available	MAX7401ESA+T	N.SO;8 pin	-40°C to +85°C	See data sheet