LTC1060 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1060 Datasheet PDF : 20 Pages
| |||
LTC1060
DEFINITION OF FILTER FUNCTIONS
3. Highpass function: available only in mode 3 at the
ouput Pins 3 (18). (Figure 3.)
G(s)
=
HOHP
s2
+
s2
s(ωo/Q)
+
ω2o
HOHP =
gain
of
the
HP
output
for
f→
fCLK
2
4. Notch function: available at Pins 3 (18) for several
modes of operation.
G(s)
=
(HON2)
s2
+
s2 + ω2o
(sωo/Q) +
ω2o
HON2 =
gain
of
the
notch
output
for
f→
fCLK
2
HON1 = gain of the notch output for f→0
5. Allpass function: available at Pins 3(18) for mode 4, 4a.
G(s)
=
HOAP
[s2
s2
–
+
s(ωo/Q)
s(ωo/Q)
+
+
ω2o]
ω2o
HOAP = gain of the allpass output for 0 < f <fC2LK
For allpass functions, the center frequency and the Q of
the numerator complex zero pair is the same as the
denominator. Under these conditions, the magnitude
response is a straight line. In mode 5, the center frequency
fz, of the numerator complex zero pair, is different than f0.
For high numerator Q’s, the magnitude response will have
a notch at fz.
fn = ωn/2π; fn is the frequency of the notch occurrence.
HOBP
0.707 HOBP
BANDPASS OUTPUT
HOP
HOLP
0.707 HOLP
LOWPASS OUTPUT
fL f0 fH
f(LOG SCALE)
Q
=
f0
fH –
fL ;
f0
=
fL fH
( ( ) fL = f0
–1 +
20
1
2
+1
2Q
( ( ) fH = f0
1+
2Q
1
2
+1
2Q
Figure 1
TLC1060 • DFF01
fP fC
f(LOG SCALE)
( ( fC = f0 •
1
–
1
2Q2
+
1
–
1
2Q2
2+
1
fP = f0
1
–
1
2Q2
HOP = HOLP •
1
1
Q
1
–
1
4Q2
TLC1060 • DFF02
Figure 2
HOP
HOHP
0.707 HOHP
HIGHPASS OUTPUT
fC fP
f(LOG SCALE)
fC = f0 •
–1
( ( 1
–
1
2Q2
+
1
–
1
2Q2
2+
1
fP = f0 •
1
–
1
2Q2
–1
HOP = HOHP •
1
1
Q
1
–
1
4Q2
Figure 3
TLC1060 • DFF03
ODES OF OPERATIO
Table 3. Modes of Operation: 1st Order Functions
MODE
6a
PIN 2 (19)
LP
PIN 3 (18)
HP
6b
LP
LP
7
LP
AP
10
fC
fCLK • R2
100(50) R3
fCLK • R2
100(50) R3
fCLK
100(50)
•
R2
R3
fZ
fCLK
100(50)
•
R2
R3
1060fb
Share Link: 