MAX7425：5th-Order, Lowpass, Switched-Capacitor Filters

The MAX7418–MAX7425 5th-order, low-pass, switched-capacitor filters (SCFs) operate from a single +5V (MAX7418–MAX7421) or +3V (MAX7422–MAX7425) supply. These devices draw only 3mA of supply current and allow corner frequencies from 1Hz to 45kHz, 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: 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 MAX7418/MAX7422 deliver 53dB of stopband rejection and a sharp rolloff with a 1.6 transition ratio. The MAX7421/MAX7425 achieve a sharper rolloff with a 1.25 transition ratio while still providing 37dB of stopband rejection. The MAX7419/MAX7423 Bessel filters provide low overshoot and fast settling, and the MAX7420/MAX7424 Butterworth filters provide a maximally flat passband response. Their fixed response simplifies the design task of selecting a clock frequency.

Key Features

5th-Order, Lowpass Filters
- Elliptic Response (MAX7418/MAX7421/MAX7422/MAX7425)
- Bessel Response (MAX7419/MAX7423)
- Butterworth Response (MAX7420/MAX7424)
Clock-Turnable Corner Frequency (1Hz to 45kHz)
Single-Supply Operation
- +5V (MAX7418–MAX7421)
- +3V (MAX7422–MAX7425)
Low Power
- 3mA (Operating Mode)
- 0.2µA (Shutdown Mode)
Available in 8-Pin µMAX® Package
Low Output Offset: ±4mV

MAX7418, MAX7419, MAX7420, MAX7421, MAX7422, MAX7423, MAX7424, MAX7425: Typical Operating Circuit

Applications/Uses

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

DataSheet

title	Download file
MAX7418-MAX7425 Data Sheet	MAX7418-MAX7425.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
MAX7418	1	5	Switched Cap	Lowpass	Elliptic	Clock	1	30	5	EE-Sim	-40 to +85 0 to +70	µMAX/8	$3.66 @1k
MAX7419					Bessel			30	5			µMAX/8	$2.92 @1k
MAX7420					Butterworth			30	5			µMAX/8	$3.69 @1k
MAX7421					Elliptic			30	5			µMAX/8	$2.78 @1k
MAX7422					Elliptic			45	3			µMAX/8	$2.92 @1k
MAX7423					Bessel			45	3			µMAX/8	$2.92 @1k
MAX7424					Butterworth			45	3			µMAX/8	$2.92 @1k
MAX7425					Elliptic			45	3			µMAX/8	$2.92 @1k

Design kits & evaluation modules

MAXFILTERBRD

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX7425CUA	No Longer Available	MAX7425CUA+	µMAX,;8 pin;15.6 mm²	0°C to +70°C	No
MAX7425CUA+	Active		µMAX,;8 pin;15.6 mm²	0°C to +70°C	Lead Free
MAX7425CUA+T	Active		µMAX,;8 pin;15.6 mm²	0°C to +70°C	Lead Free
MAX7425CUA-T	No Longer Available	MAX7425CUA+T	µMAX,;8 pin;15.6 mm²	0°C to +70°C	No
MAX7425EUA	No Longer Available	MAX7425EUA+	µMAX,;8 pin;15.6 mm²	-40°C to +85°C	No
MAX7425EUA+	Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
MAX7425EUA+T	Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
MAX7425EUA-T	No Longer Available	MAX7425EUA+T	µMAX,;8 pin;15.6 mm²	-40°C to +85°C	No

MAX7418-MAX7425.pdf MAX7425