MF5 datasheet(6/18 Pages) TI1

6 / 18 page

Typical Performance

Characteristics (Continued)

Supply Current vs Temperature

TLH5066 – 4

10 Definitions of Terms

fCLK the frequency of the external clock signal applied to

pin 8

fo center frequency of the second order function complex

pole pair fo is measured at the bandpass output of the MF5

and is the frequency of maximum bandpass gain (

Figure 1 )

fnotch the frequency of minimum (ideally zero) gain at the

notch output

fz the center frequency of the second order complex zero

pair if any If fz is different from fo and if Qz is high it can be

observed as the frequency of a notch at the allpass output

(

Figure 10 )

‘‘quality factor’’ of the 2nd order filter Q is measured at

the bandpass output of the MF5 and is equal to fo divided by

the b3dB bandwidth of the 2nd order bandpass filter (

Fig-

ure 1 ) The value of Q determines the shape of the 2nd

order filter responses as shown in

Figure 6

Qz the quality factor of the second order complex zero pair

if any Qz is related to the allpass characteristic which is

written

HAP(s) e

HOAP

s2bs

0o2

s2 a

s0o

0o2

where Qz e Q for an all-pass response

HOBP the gain (in VV) of the bandpass output at f e fo

HOLP the gain (in VV) of the lowpass output as f

x 0Hz

(

Figure 2 )

HOHP the gain (in VV) of the highpass output as

x fclk 2 (Figure 3 )

HON the gain (in VV) of the notch output as f

x 0Hzand

as f

x fclk 2 when the notch filter has equal gain above

and below the center frequency (

Figure 4 ) When the low-

frequency gain differs from the high-frequency gain as in

modes 2 and 3a (

Figures 11 and 8 ) the two quantities be-

low are used in place of HON

HON1 the gain (in VV) of the notch output as f

x0 Hz

HON2 the gain (in VV) of the notch output as f

xfclk 2

(a)

TLH5066 – 5

(b)

TLH5066 – 6

HBP(s) e

HOBP

s2 a

0o2

Q e

fH b fL

fo e

0fLfH

fL e fo

b12Qa0 12QJ

fH e fo

12Qa0 12QJ

0o e 2qfo

FIGURE 1 2nd-Order Bandpass Response

(a)

TLH5066 – 7

(b)

TLH5066 – 8

HLP(s) e

HOLP0o2

s2 a

0o2

fc e fo c

0 1b 1

2Q2

J a0 1b 1

2Q2

fp e fo

01b 12Q2

HOP e HOLP c

01b 14Q2

FIGURE 2 2nd-Order Low-Pass Response

(a)

TLH5066 – 9

FIGURE 3 2nd-Order High-Pass Response

(b)

TLH5066 – 10

HHP(s)e

HOHPs2

s2 a

0o2

fcefoc

01b 1

2Q2

Ja01b 12Q2J

(

fp e fo c

01b 12Q2(b

HOP e HOHP c

01b 14Q2

MF5 Fiches technique(PDF) 6 Page - Texas Instruments

MF5 Fiches technique(HTML) 6 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Fiches technique Télécharger

Lien URL