The MAX270/MAX271CWG+T are digitally-programmed, dual second-order continuous-time lowpass filters. Their typical dynamic range of 96dB surpasses most switched capacitor filters which require additional filtering to remove clock noise. The MAX270/MAX271CWG+T are ideal for anti-aliasing and DAC smoothing applications and can be cascaded for higher-order responses.
The two filter sections are independently programmable by either microprocessor (μP) control or pin strapping. Cutoff frequencies in the 1kHz to 25kHz range can be selected.
The MAX270 has an on-board, uncommitted op amp, while the MAX271CWG+T has an internal track-and-hold (T/H).
characterization
- Continuous-Time Filtering – No Clock Required
- Dual 2nd-Order Lowpass Filters
- Sections Independently Programmable: 1kHz to 25kHz
- 96dB Dynamic Range
- No External Components
- Cascadable for Higher Order
- Low-Power Shutdown Mode
- Track-and-Hold (MAX271)
Application Areas
- Anti-Aliasing and Track-and-Hold (MAX271)
- Anti-Aliasing Filter
- Low-Noise Applications
- Lowpass Filtering
- Output Smoothing
(Product Image: Diagram)
Technical Parameters
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Number of Channels
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2
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Cutoff Frequency
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25 kHz
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Supply Voltage Max
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16 V
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Supply Voltage Min
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4.75 V
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Maximum Operating Temperature
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+ 70 C
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Mounting Style
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SMD/SMT
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Package / Case
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SOIC-24 Wide
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Packaging
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Reel
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Minimum Operating Temperature
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0 C
MAX271CWG+T Datasheet
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MAX271 data sheet for guidance
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