MF5 datasheet(8/18 Pages) TI1

8 / 18 page

20 Modes of Operation

The MF5 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

MF5 closely approximates continuous filters the following

discussion is based on the well known frequency domain

Each MF5 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

fnotch e fo (See Figure 7 )

center frequency of the complex pole pair

fCLK

100

fCLK

fnotch e center frequency of the imaginary zero pair e fo

HOLP e Lowpass gain (as f

x 0) eb

HOBP e Bandpass gain (at f e fo) eb

HON e Notch output gain as f x 0

x fCLK 2

(eb

the b3 dB bandwidth of the bandpass output

Circuit dynamics

HOLP e

HOBP

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 )

fCLK

100

fCLK

HOLP

1 HOLP(peak) j Q c HOLP (for high Q’s)

HOBP1 eb

HOBP2 e 1 (non-inverting)

Circuit dynamics HOBP1 e Q

Note VIN should be driven from a low impedance (k1kX)

TLH5066 – 16

FIGURE 7 MODE 1

TLH5066 – 17

FIGURE 8 MODE 1a

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