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LTC1068-25IG 数据表(PDF) 13 Page - Linear Technology

部件名 LTC1068-25IG
功能描述  Clock-Tunable, Quad Second Order, Filter Building Blocks
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1068-25IG 数据表(HTML) 13 Page - Linear Technology

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LTC1068 Series
13
1068fc
MODES OF OPERATION
Mode 3
In Mode 3, the ratio of the external clock frequency to
the center frequency of each 2nd order section can be
adjusted above or below the parts nominal ratio. Figure 6
illustratesMode3,theclassicalstatevariableconfiguration,
providinghighpass,bandpassandlowpass2ndorderfilter
functions. Mode 3 is slower than Mode 1. Mode 3 can be
used to make high order all-pole bandpass, lowpass and
highpass filters.
PleaserefertotheOperatingLimitsparagraphunderApplica-
tions Information for a guide to the use of capacitor CC.
Mode 2
Mode 2 is a combination of Mode 1 and Mode 3, shown
in Figure 7. With Mode 2, the clock-to-center frequency
ratio, fCLK/fO, is always less than the part’s nominal ratio.
The advantage of Mode 2 is that it provides less sensitivity
to resistor tolerances than does Mode 3. Mode 2 has a
highpassnotchoutputwherethenotchfrequencydepends
solely on the clock frequency and is therefore less than
the center frequency, fO.
PleaserefertotheOperatingLimitsparagraphunderApplica-
tions Information for a guide to the use of capacitor CC.
Figure 5. Mode 1b, 2nd Order Filter Providing Notch,
Bandpass and Lowpass Outputs
Figure 6. Mode 3, 2nd Order Section Providing
Highpass, Bandpass and Lowpass Outputs
Figure 7. Mode 2, 2nd Order Filter Providing Highpass
Notch, Bandpass and Lowpass Outputs
+
Σ
AGND
R1
N
BP
LP
VIN
1068 F05
+ –
S
R2
R3
CC
R5
R6
fO =
; fn = fO
Q =
; HON = –
; HOBP = –
HOLP = –
R2
R1
R3
R1
R3
R2
fCLK
RATIO
R6
(R6 + R5)
R2
R1
R6 + R5
R6
R6
(R6 + R5)
( )
DEVICE
LTC1068
LTC1068-200
LTC1068-50
LTC1068-25
RATIO
100
200
50
25
+
Σ
AGND
R1
HP
BP
LP
VIN
1068 F06
+ –
S
1/4 LTC1068
R2
R3
CC
R4
fO =
fCLK
RATIO
R3
R2
R2R4
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
( )
R2R4
HOHP = –
; HOBP = –
R2
R1
R3
R1
R4
R1
; HOLP = –
; Q = 1.005
DEVICE
LTC1068
LTC1068-200
LTC1068-50
LTC1068-25
RATIO
100
200
50
25
+
Σ
AGND
R1
HPN
BP
LP
VIN
1068 F07
+ –
S
R2
R3
CC
R4
fO =
; fn =
fCLK
RATIO
fCLK
RATIO
R2R4
1 +
Q = 1.005 R3
R2
( )√ R2
R4
1 +
R3
(RATIO)(0.32)(R4)
(
)
1
1–
R3
(RATIO)(0.32)(R4)
(
)
1
1–
HOHPN = –
(AC GAIN, f >> fO); HOHPN = –
R2
R1
R2
R1
R2
R1
1
R2
R4
1 +
( )
1
R2
R4
1 +
( )
(DC GAIN)
HOBP = – R3
R1
; HOLP = –
DEVICE
LTC1068
LTC1068-200
LTC1068-50
LTC1068-25
RATIO
100
200
50
25


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