LMF100CIWMSLASHNOPB datasheet(33/42 Pages) TI1

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LMF100

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SNOSBG9B – JULY 1999 – REVISED JUNE 2015

12 Device and Documentation Support

12.1 Device Support

12.1.1 Device Nomenclature

12.1.1.1 Definitions of Terms

fCLK: the frequency of the external clock signal applied to pin 10 or 11.

f0: center frequency of the second order function complex pole pair. f0 is measured at the bandpass outputs of

the LMF100, and is the frequency of maximum bandpass gain. (Figure 25).

fnotch: the frequency of minimum (ideally zero) gain at the notch outputs.

fz: the center frequency of the second order complex zero pair, if any. If fz is different from f0 and if Qz is high, it

can be observed as the frequency of a notch at the allpass output. (Figure 46).

Q: “quality factor” of the 2nd order filter. Q is measured at the bandpass outputs of the LMF100 and is equal to f0

divided by the

−3 dB bandwidth of the 2nd order bandpass filter (Figure 25). The value of Q determines the shape

of the 2nd order filter responses as shown in Figure 35.

Qz: the quality factor of the second order complex zero pair, if any. QZ is related to the allpass characteristic,

which is written:

where QZ = Q for an allpass response.

HOLP: the gain (in V/V) of the lowpass output as f → 0 Hz (Figure 27).

HOHP: the gain (in V/V) of the highpass output as f → fCLK/2 (Figure 29).

HON: the gain (in V/V) of the notch output as f → 0 Hz and as f → fCLK/2, when the notch filter has equal gain

above and below the center frequency (Figure 31 ). When the low-frequency gain differs from the high-frequency

gain, as in modes 2 and 3a (Figure 43 and Figure 45), the two quantities below are used in place of HON.

HON1: the gain (in V/V) of the notch output as f → 0 Hz.

HON2: the gain (in V/V) of the notch output as f → fCLK/2.

12.2 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective

contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of

Use.

TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration

among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help

solve problems with fellow engineers.

Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and

contact information for technical support.

12.3 Trademarks

LMCMOS, E2E are trademarks of Texas Instruments.

All other trademarks are the property of their respective owners.

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