MF10ACN datasheet(10/20 Pages) NSC

10 / 20 page

20 Modes of Operation (Continued)

MODE 2 Notch 2 Bandpass Lowpass fnotch k fO

(See

Figure 9 )

center frequency

fCLK

100

0R2R4a1or fCLK50 0R2R4a1

fnotch e

fCLK

100

fCLK

quality factor of the complex pole pair

e 0

R2R4 a 1

R2R3

HOLP e Lowpass output gain (as f

x 0)

R2R1

R2R4 a 1

HOBP e Bandpass output gain (at f e fO) ebR3R1

HON1 e Notch output gain (as f x 0)

R2R1

R2R4 a 1

HON2 e Notch output gain

asfxfCLK2J ebR2R1

Filter dynamics HOBP e Q

0HOLP HON2 e 0HON1 HON2

MODE 3 Highpass Bandpass Lowpass Outputs

(See

Figure 10 )

fCLK

100

0R2R4 or fCLK50c0R2R4

quality factor of the complex pole pair

0R2R4cR3R2

HOHP e Highpass Gain

asfxfCLK2J ebR2R1

HOBP e Lowpass Gain

atfefOJ ebR3R1

HOLP e Lowpass Gain

asfx0J ebR4R1

Circuit dynamics

HOHP

HOLP

HOBP e

0HOHP c HOLP c Q

HOLP(peak) j Q c HOLP (for high Q’s)

HOHP(peak) j Q c HOHP (for high Q’s)

TLH10399 – 18

FIGURE 9 MODE 2

TLH10399 – 19

In Mode 3 the feedback loop is closed around the input summing amplifier the finite GBW product of this op amp causes a slight Q enhancement If this is a

problem connect a small capacitor (10 pF b 100 pF) across R4 to provide some phase lead

FIGURE 10 MODE 3

MF10ACN Datasheet(PDF) 10 Page - National Semiconductor (TI)

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