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
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
titleDownload file
MAX7418-MAX7425 Data SheetMAX7418-MAX7425.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
MAX741815Switched CapLowpassEllipticClock1305EE-Sim-40 to +85
0 to +70
µMAX/8$3.66 @1k
MAX7419Bessel305µMAX/8$2.92 @1k
MAX7420Butterworth305µMAX/8$3.69 @1k
MAX7421Elliptic305µMAX/8$2.78 @1k
MAX7422Elliptic453µMAX/8$2.92 @1k
MAX7423Bessel453µMAX/8$2.92 @1k
MAX7424Butterworth453µMAX/8$2.92 @1k
MAX7425Elliptic453µMAX/8$2.92 @1k
Design kits & evaluation modules
Related Products
  • MAX7408:5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
  • MAX7411:5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
  • MAX7415:5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
  • MAX7412:5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
  • MAX7413:5th-Order, Lowpass, Switched-Capacitor Filters
  • MAX7410:5th-Order, Lowpass, Switched-Capacitor Filters
  • MAX7414:5th-Order, Lowpass, Switched-Capacitor Filters
  • MAX7409:5th-Order, Lowpass, Switched-Capacitor Filters
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7425CUANo Longer AvailableMAX7425CUA+µMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX7425CUA+ActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX7425CUA+TActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX7425CUA-TNo Longer AvailableMAX7425CUA+TµMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX7425EUANo Longer AvailableMAX7425EUA+µMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX7425EUA+ActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX7425EUA+TActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX7425EUA-TNo Longer AvailableMAX7425EUA+TµMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX7418-MAX7425.pdf MAX7425
MAX7418-MAX7425.pdf MAX7425