MF10 datasheet(15/30 Pages) TI1

15 / 30 page

1.0 Definition of Terms (Continued)

2.0 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 known frequency domain.

Each MF10 can produce a full 2nd order function. See

Table

1 for a summary of the characteristics of the various modes.

MODE 1: Notch 1, Bandpass, Lowpass Outputs:

notch =fO (See Figure 7)

O= center frequency of the complex pole pair

notch= center frequency of the imaginary zero pair = fO.

= quality factor of the complex pole pair

BW = the −3 dB bandwidth of the bandpass output.

Circuit dynamics:

MODE 1a: Non-Inverting BP, LP (See

Figure 8)

Note: VIN should be driven from a low impedance (<1kΩ) source.

(a) Bandpass

(b) Low Pass

01039950

01039951

01039952

(d) Notch

(e) All-Pass

01039953

01039954

FIGURE 6. Response of various 2nd-order filters as a function of Q.

Gains and center frequencies are normalized to unity.

MF10 Datasheet(PDF) 15 Page - Texas Instruments