MF10 datasheet(9/20 Pages) NSC

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 )

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

x 0

x fCLK 2

( e bR2

quality factor of the complex pole pair

the b3 dB bandwidth of the bandpass output

Circuit dynamics

HOLP e

HOBP

or HOBP e HOLP c Q

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 eb1 HOLP(peak) j Q c HOLP (for high Q’s)

HOBP1eb

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

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