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
MAX7401, MAX7405: Typical Operating Circuit
Applications/Uses
  • ADC Anti-Aliasing
  • Air-Bag Electronics
  • CT2 Base Stations
  • Post-DAC Filtering
  • Speech Processing
DataSheet
titleDownload file
MAX7401-MAX7405 Data SheetMAX7401-MAX7405.pdf
Parametrics
Part NumberFilter SectionsOrder Per Filter SectionFilter ClassFilter TypeFilter CharacteristicProgram MethodLowest Cutoff
(Hz)
Highest Cutoff
(kHz)
VSUPPLY
(V)
Design ToolsOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxminSee Notes
MAX740118Switched CapLowpassBesselClock155EE-Sim-40 to +85
0 to +70
PDIP(N)/8
SOIC(N)/8
$2.84 @1k
MAX74053PDIP(N)/8
SOIC(N)/8
$3.16 @1k
Related Products
  • MAX291:8th-Order, Lowpass, Switched-Capacitor Filters
  • MAX296:8th-Order, Lowpass, Switched-Capacitor Filters
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7401CPANo Longer AvailableMAX7401CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX7401CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX7401CSANo Longer AvailableMAX7401CSA+SOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX7401CSA+ActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX7401CSA+TActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX7401CSA-TNo Longer AvailableMAX7401CSA+TN.SO;8 pin0°C to +70°CSee data sheet
MAX7401EPANo Longer AvailableMAX7401EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX7401EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
MAX7401ESANo Longer AvailableMAX7401ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX7401ESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7401ESA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX7401ESA-TNo Longer AvailableMAX7401ESA+TN.SO;8 pin-40°C to +85°CSee data sheet
MAX7401-MAX7405.pdf MAX7405
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