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Key Features
Applications/Uses
Parametric specs for Active Filters
| Filter Type | Lowpass |
| Filter Sections | 1 |
| Order Per Filter Section | 5 |
| Highest Cutoff (kHz) (min) | 45 |
| Lowest Cutoff (Hz) (max) | 1 |
| Filter Class | Switched Cap |
| Filter Characteristic | Butterworth |
| Program Method | Clock |
| Oper. Temp. (°C) | -40 to +85 0 to +70 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 3.07 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | 5th-Order, Lowpass, Switched-Capacitor Filters | Nov 01, 2000 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for Active Filters
| Filter Type | Lowpass |
| Filter Sections | 1 |
| Order Per Filter Section | 5 |
| Highest Cutoff (kHz) (min) | 45 |
| Lowest Cutoff (Hz) (max) | 1 |
| Filter Class | Switched Cap |
| Filter Characteristic | Butterworth |
| Program Method | Clock |
| Oper. Temp. (°C) | -40 to +85 0 to +70 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 3.07 |
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
Applications/Uses
- ADC Anti-Aliasing
- CT2 Base Stations
- DAC Post-Filtering
- Speech Processing
Description
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.
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.
Simplified Block Diagram
MAX7418, MAX7419, MAX7420, MAX7421, MAX7422, MAX7423, MAX7424, MAX7425: Typical Operating Circuit
Technical Docs
| Data Sheet | 5th-Order, Lowpass, Switched-Capacitor Filters | Nov 01, 2000 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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