MAX7426

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

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


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Description

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.
MAX7426, MAX7427: Typical Operating Circuit MAX7426, MAX7427: Typical Operating Circuit Enlarge+

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

Applications/Uses

  • ADC Anti-Aliasing Filter
  • Post-DAC Filtering Speech Processing

See parametric specs for Active Filters (47)


Part NumberFilter SectionsOrder Per Filter SectionFilter ClassFilter TypeFilter CharacteristicProgram MethodLowest Cutoff
(Hz)
Highest Cutoff
(kHz)
VSUPPLY
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxminSee Notes
MAX7426 15Switched CapLowpassEllipticClock195
-40 to +85
0 to +70
PDIP/8
UMAX/8
$1.51 @1k
MAX7427 123
PDIP/8
UMAX/8
$1.45 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

Tutorial 724 Generating Switched-Capacitor-Filter Clocks
Request Reliability Report for: MAX7426 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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