MAX7400：8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Smallest, Lowest-Power 8th-Order Elliptic Filters

The MAX7400/MAX7403/MAX7404/MAX7407 8th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7400/MAX7403) or +3V (MAX7404/MAX7407) supply. These devices draw 2mA of supply current and allow corner frequencies from 1Hz to 10kHz, making them ideal for low-power anti-aliasing and post-DAC filtering applications. They feature a shutdown mode that reduces the 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. In addition, an offset adjustment pin (OS) allows for the adjustment of the DC output level. The MAX7400/MAX7404 provide 82dB of stopband rejection and a sharp rolloff with a transition ratio of 1.5. The MAX7403/MAX7407 provide a sharper rolloff with a transition ratio of 1.2, while still delivering 60dB of stopband rejection. The fixed response of these devices simplifies the design task to corner-frequency selection by setting a clock frequency. The MAX7400/MAX7403/MAX7404/MAX7407 are available in 8-pin SO and DIP packages.

Key Features

8th-Order Lowpass Elliptic Filter
Low Noise and Distortion -82dB THD + Noise (MAX7400)
Clock-Tunable Corner Frequency (1Hz to 10kHz)
100:1 Clock-to-Corner Ratio
Single-Supply Operation
- +5V (MAX7400/MAX7403)
- +3V (MAX7404/MAX7407)
Low Power
- 2mA (Operating Mode)
- 0.2µA (Shutdown Mode)
Available in 8-Pin SO and DIP Packages
Low Output Offset: ±5mV

MAX7400, MAX7403, MAX7404, MAX7407: Typical Operating Circuit

Applications/Uses

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

DataSheet

title	Download file
MAX7400-MAX7407 Data Sheet	MAX7400-MAX7407.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
MAX7400	1	8	Switched Cap	Lowpass	Elliptic	Clock	1	10	5	EE-Sim	-40 to +85 0 to +70	PDIP(N)/8 SOIC(N)/8	$3.15 @1k
MAX7403									5			PDIP(N)/8 SOIC(N)/8	$2.94 @1k
MAX7404									3			PDIP(N)/8 SOIC(N)/8	$2.76 @1k
MAX7407									3			PDIP(N)/8 SOIC(N)/8	$2.76 @1k

Quality and Environmental Data

MAX7400.pdf

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX7400CPA	No Longer Available	MAX7400CPA+	PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	No
MAX7400CPA+	Active		PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	Lead Free
MAX7400CSA	No Longer Available	MAX7400CSA+	SOIC(N),;8 pin;30.9 mm²	0°C to +70°C	No
MAX7400CSA+	Active		SOIC(N),;8 pin;30.9 mm²	0°C to +70°C	Lead Free
MAX7400CSA+T	Active		SOIC(N),;8 pin;30.9 mm²	0°C to +70°C	Lead Free
MAX7400CSA-T	No Longer Available	MAX7400CSA+T	N.SO;8 pin	0°C to +70°C	See data sheet
MAX7400EPA	No Longer Available	MAX7400EPA+	PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	No
MAX7400EPA+	Active		PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	Lead Free
MAX7400ESA	No Longer Available	MAX7400ESA+	SOIC(N),;8 pin;30.9 mm²	-40°C to +85°C	No
MAX7400ESA+	Active		SOIC(N),;8 pin;30.9 mm²	-40°C to +85°C	Lead Free
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX7400ESA+T	Active		SOIC(N),;8 pin;30.9 mm²	-40°C to +85°C	Lead Free
MAX7400ESA-T	No Longer Available	MAX7400ESA+T	N.SO;8 pin	-40°C to +85°C	See data sheet