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MF10AJ Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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MF10AJ Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 20 page  20 Modes of Operation The MF10 is a switched capacitor (sampled data) filter To fully describe its transfer functions a time domain approach is appropriate Since this is cumbersome and since the MF10 closely approximates continuous filters the following discussion is based on the well know frequency domain Each MF10 can produce a full 2nd order function See Ta- ble I for a summary of the characteristics of the various modes MODE 1 Notch 1 Bandpass Lowpass Outputs fnotch e fO (See Figure 7 ) fO e center frequency of the complex pole pair e fCLK 100 or fCLK 50 fnotch e center frequency of the imaginary zero pair e fO HOLP e Lowpass gain (as f x 0) eb R2 R1 HOBP e Bandpass gain (at f e fO) eb R3 R1 HON e Notch output gain as f x 0 f x fCLK 2 ( e bR2 R1 Q e fO BW e R3 R2 e quality factor of the complex pole pair BW e the b3 dB bandwidth of the bandpass output Circuit dynamics HOLP e HOBP Q or HOBP e HOLP c Q e HON c Q HOLP(peak) j Q c HOLP (for high Q’s) MODE 1a Non-Inverting BP LP (See Figure 8 ) fO e fCLK 100 or fCLK 50 Q e R3 R2 HOLP eb1 HOLP(peak) j Q c HOLP (for high Q’s) HOBP1eb R3 R2 HOBP2e 1 (Non-Inverting) Circuit Dynamics HOBP1 e Q Note VIN should be driven from a low impedance (k1kX) source TLH10399 – 16 FIGURE 7 MODE 1 TLH10399 – 17 FIGURE 8 MODE 1a 9 |
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Similar Description - MF10AJ |
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