MAX7404
8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
Smallest, Lowest-Power 8th-Order Elliptic Filters
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Overview
Features and Benefits
- 8th-Order Lowpass Elliptic Filter
- Low Noise and Distortion -82dB THD + Noise (MAX7400)
- Clock-Tunable Corner Frequency (1Hz to 10kHz)
- 100:1 Clock-to-Corner Ratio
- Single-Supply Operation
- +5V (MAX7400/MAX7403)
- +3V (MAX7404/MAX7407)
- Low Power
- 2mA (Operating Mode)
- 0.2µA (Shutdown Mode)
- Available in 8-Pin SO and DIP Packages
- Low Output Offset: ±5mV
Product Details
The MAX7400/MAX7403/MAX7404/MAX7407 8th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7400/MAX7403) or +3V (MAX7404/MAX7407) supply. These devices draw 2mA of supply current and allow corner frequencies from 1Hz to 10kHz, making them ideal for low-power anti-aliasing and post-DAC filtering applications. They feature a shutdown mode that reduces the 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. In addition, an offset adjustment pin (OS) allows for the adjustment of the DC output level.
The MAX7400/MAX7404 provide 82dB of stopband rejection and a sharp rolloff with a transition ratio of 1.5. The MAX7403/MAX7407 provide a sharper rolloff with a transition ratio of 1.2, while still delivering 60dB of stopband rejection. The fixed response of these devices simplifies the design task to corner-frequency selection by setting a clock frequency. The MAX7400/MAX7403/MAX7404/MAX7407 are available in 8-pin SO and DIP packages.
Applications
- ADC Anti-Aliasing
- Air-Bag Electronics
- CT2 Base Stations
- Post-DAC Filtering
- Speech Processing
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Reference Designs (1)
Design Resources
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PCN-PDN Information
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MAX7404 Discussions
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