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MF5CN Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. MF5CN
Description  MF5 Universal Monolithic Switched Capacitor Filter
Download  16 Pages
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

MF5CN Datasheet(HTML) 5 Page - National Semiconductor (TI)

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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 )
Q
‘‘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
0o
Qz
a
0o2
J
s2 a
s0o
Q
a
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
f
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
0o
Q
s
s2 a
s
0o
Q
a
0o2
Q e
fo
fH b fL
fo e
0fLfH
fL e fo
b12Qa0  12QJ
2
a
1
J
fH e fo
 12Qa0  12QJ
2
a
1
J
0o e 2qfo
FIGURE 1 2nd-Order Bandpass Response
(a)
TLH5066 – 7
(b)
TLH5066 – 8
HLP(s) e
HOLP0o2
s2 a
s
0o
Q
a
0o2
fc e fo c
0 1b 1
2Q2
J a0 1b 1
2Q2
J
2
a
1
fp e fo
01b 12Q2
HOP e HOLP c
1
1
Q
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
s
0o
Q
a
0o2
fcefoc
01b 1
2Q2
Ja01b 12Q2J
2
a
1
(
b
1
fp e fo c
01b 12Q2(b
1
HOP e HOHP c
1
1
Q
01b 14Q2
5


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