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MF5CN Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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MF5CN Datasheet(HTML) 5 Page - National Semiconductor (TI) |
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Typical Performance Characteristics (Continued) Supply Current vs Temperature TLH5066 – 4 10 Definitions of Terms fCLK the frequency of the external clock signal applied to pin 8 fo center frequency of the second order function complex pole pair fo is measured at the bandpass output of the MF5 and is the frequency of maximum bandpass gain ( Figure 1 ) fnotch the frequency of minimum (ideally zero) gain at the notch output fz the center frequency of the second order complex zero pair if any If fz is different from fo and if Qz is high it can be observed as the frequency of a notch at the allpass output ( Figure 10 ) Q ‘‘quality factor’’ of the 2nd order filter Q is measured at the bandpass output of the MF5 and is equal to fo divided by the b3dB bandwidth of the 2nd order bandpass filter ( Fig- ure 1 ) The value of Q determines the shape of the 2nd order filter responses as shown in Figure 6 Qz the quality factor of the second order complex zero pair if any Qz is related to the allpass characteristic which is written HAP(s) e HOAP s2bs 0o Qz a 0o2 J s2 a s0o Q a 0o2 where Qz e Q for an all-pass response HOBP the gain (in VV) of the bandpass output at f e fo HOLP the gain (in VV) of the lowpass output as f x 0Hz ( Figure 2 ) HOHP the gain (in VV) of the highpass output as f x fclk 2 (Figure 3 ) HON the gain (in VV) of the notch output as f x 0Hzand as f x fclk 2 when the notch filter has equal gain above and below the center frequency ( Figure 4 ) When the low- frequency gain differs from the high-frequency gain as in modes 2 and 3a ( Figures 11 and 8 ) the two quantities be- low are used in place of HON HON1 the gain (in VV) of the notch output as f x0 Hz HON2 the gain (in VV) of the notch output as f xfclk 2 (a) TLH5066 – 5 (b) TLH5066 – 6 HBP(s) e HOBP 0o Q s s2 a s 0o Q a 0o2 Q e fo fH b fL fo e 0fLfH fL e fo b12Qa0 12QJ 2 a 1 J fH e fo 12Qa0 12QJ 2 a 1 J 0o e 2qfo FIGURE 1 2nd-Order Bandpass Response (a) TLH5066 – 7 (b) TLH5066 – 8 HLP(s) e HOLP0o2 s2 a s 0o Q a 0o2 fc e fo c 0 1b 1 2Q2 J a0 1b 1 2Q2 J 2 a 1 fp e fo 01b 12Q2 HOP e HOLP c 1 1 Q 01b 14Q2 FIGURE 2 2nd-Order Low-Pass Response (a) TLH5066 – 9 FIGURE 3 2nd-Order High-Pass Response (b) TLH5066 – 10 HHP(s)e HOHPs2 s2 a s 0o Q a 0o2 fcefoc 01b 1 2Q2 Ja01b 12Q2J 2 a 1 ( b 1 fp e fo c 01b 12Q2(b 1 HOP e HOHP c 1 1 Q 01b 14Q2 5 |
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