MAX7426:5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Industry's Lowest-Power and Industry's Smallest 5th-Order Lowpass Filters

The MAX7426/MAX7427 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7426) or +3V (MAX7427) supply. The devices draw only 0.8mA of supply current and allow corner frequencies from 1Hz to 12kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They can be put into a low-power mode, reducing 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. An offset-adjust pin allows for adjustment of the DC output level. The MAX7426/MAX7427 deliver 37dB of stopband rejection and a sharp rolloff with a transition ratio of 1.25. Their fixed response limits the design task to selecting a clock frequency.

Key Features
  • 5th-Order, Elliptic Lowpass Filters
  • Low Noise and Distortion: -80dB THD + Noise
  • Clock-Tunable Corner Frequency (1Hz to 12kHz)
  • Single-Supply Operation
    • +5V (MAX7426)
    • +3V (MAX7427)
  • Low Power
    • 0.8mA (Operating Mode)
    • 0.2µA (Shutdown Mode)
  • Available in 8-Pin µMAX®/PDIP Packages
  • Low Output Offset: ±4mV
MAX7426, MAX7427: Typical Operating Circuit
MAX7426, MAX7427: Typical Operating Circuit
Applications/Uses
  • ADC Anti-Aliasing Filter
  • Post-DAC Filtering Speech Processing
DataSheet
titleDownload file
MAX7426-MAX7427 Data SheetMAX7426-MAX7427.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
MAX742615Switched CapLowpassEllipticClock195EE-Sim-40 to +85
0 to +70
µMAX/8
PDIP(N)/8
$1.44 @1k
MAX7427123µMAX/8
PDIP(N)/8
$1.38 @1k
Related Products
  • MAX7411:5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
  • MAX7415:5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7426CPANo Longer AvailableMAX7426CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX7426CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX7426CUANo Longer AvailableMAX7426CUA+µMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX7426CUA+ActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX7426CUA+TActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX7426CUA-TNo Longer AvailableMAX7426CUA+TµMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX7426EPANo Longer AvailableMAX7426EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX7426EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
MAX7426EUANo Longer AvailableMAX7426EUA+µMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX7426EUA+ActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7426EUA+TActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX7426EUA-TNo Longer AvailableMAX7426EUA+TµMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX7426-MAX7427.pdf MAX7427
Generating Switched-Capacitor-Filter Clocks MAX7490
MAX7426-MAX7427.pdf MAX7427