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參數(shù)資料
| 型號： | LTC1264CN#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 0K |
| 描述： | IC FILTR BUILDNG BLK HISPD 24DIP |
| 標(biāo)準(zhǔn)包裝： | 15 |
| 濾波器類型： | 通用開關(guān)電容器 |
| 頻率 - 截止或中心： | 250kHz |
| 濾波器數(shù)： | 4 |
| 濾波器階數(shù)： | 2nd |
| 電源電壓： | ±2.37 V ~ 8 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 24-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 24-PDIP |
| 包裝： | 管件 |
7
LTC1264
1264fb
ODES OF OPERATIO
W
U
optimum mode for high Q designs with fCLK to fCUTOFF (or
fCENTER) ratios greater than 20:1.
Please refer to the Maximum Frequency of Operation
paragraph under Applications Information for a guide to
the use of capacitor CC.
–
+
Σ
∫
AGND
R1
N
BP
LP
VIN
1264 F04
+
–
S
1/4 LTC1264
R2
R3
CC
fi =
; fO = fi; fn = fO
Q =
; HON = –
; HOBP = –
HOLP = HON
R2
R1
R3
R1
R3
R2
fCLK
20
Figure 4. Mode 1, 2nd Order Filter Providing Notch,
Bandpass and Lowpass Outputs
–
+
Σ
∫
AGND
R1
N
BP
LP
VIN
1264 F05
+
–
S
NOTE: R5
≤ 5k
R2
R3
CC
R5
R6
fi =
; fO = fi
; fn = fO
Q =
; HON = –
; HOBP = –
HOLP = –
R2
R1
R3
R1
R3
R2
fCLK
20
√ R6
(R6 + R5)
R2
R1
R6 + R5
R6
1/4 LTC1264
√ R6
(R6 + R5)
()
Figure 5. Mode 1b, 2nd Order Filter Providing Notch,
Bandpass and Lowpass Outputs
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 20:1. Figure 6 illustrates Mode 3,
the classical state variable configuration, providing high-
pass, bandpass, and lowpass 2nd order filter functions.
Mode 3 is slower than Mode 1. Mode 3 can be used to
make high order all-pole bandpass, lowpass, and high-
pass filters.
Please refer to the Maximum Frequency of Operation
paragraph under Applications 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 20:1. The advantage of Mode
2 is that it provides less sensitivity to resistor tolerances
than does Mode 3. As in Mode 1, Mode 2 has a notch
output which depends on the clock frequency, and the
notch frequency is therefore less than the center fre-
quency, fO.
Please refer to the Maximum Frequency of Operation
paragraph under Applications Information for a guide to
the use of capacitor CC.
–
+
Σ
∫
AGND
R1
HP
BP
LP
VIN
1264 F06
+
–
S
1/4 LTC1264
R2
R3
CC
R4
fi =
; fO = fi
; Q = 1.005
fCLK
20
R3
R2
√R2
R4
R3
6.42R4
(
)
1
1 –
( )
√R2
R4
HOHP = –
; HOBP = –
;
R2
R1
R3
R1
R3
6.42R4
(
)
1
1 –
R4
R1
HOLP = –
Figure 6. Mode 3, 2nd Order Section Providing
Highpass, Bandpass and Lowpass Outputs
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