tors RH and RL
參數(shù)資料
型號(hào): LTC1264CN
廠商: Linear Technology
文件頁(yè)數(shù): 15/16頁(yè)
文件大?。?/td> 0K
描述: IC FILTR BUILDNG BLK HISPD 24DIP
標(biāo)準(zhǔn)包裝: 15
濾波器類型: 通用開(kāi)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
8
LTC1264
1264fb
ODES OF OPERATIO
W
U
tors RH and RL to create a notch. This is shown in Figure
8. Mode 3a is more versatile than Mode 2 because the
notch frequency can be higher or lower than the center
frequency of the 2nd order section. The external op amp
of Figure 8 is not always required. When cascading the
sections of the LTC1264, the highpass and lowpass
outputs can be summed directly into the inverting input of
the next section.
Please refer to the Maximum Frequency of Operation
paragraph under Applications Information for a guide to
the use of capacitor CC.
Mode 2n
This mode extends the circuit topology of Mode 3a to
Mode 2 (Figure 9) where the highpass notch and lowpass
outputs are summed through two external resistors RH
and RL to create a lowpass output with a notch higher in
frequency than the notch in Mode 2. This mode, shown in
Figure 8, is most useful in lowpass elliptic designs. When
cascading the sections of the LTC1264, the highpass
notch and lowpass outputs can be summed directly into
the inverting input of the next section.
Please refer to the Maximum Frequency of Operation
paragraph under Applications Information for a guide to
the use of capacitor CC.
Figure 7. Mode 2, 2nd Order Filter Providing Highpass
Notch, Bandpass and Lowpass Outputs
+
Σ
AGND
R1
N
BP
LP
VIN
1264 F07
+
S
1/4 LTC1264
R2
R3
CC
R4
fi =
; fO = fi
; fn = fO
fCLK
20
R2
R4
1 +
Q = 1.005
R3
R2
( )√ R2
R4
1 +
R3
6.42R4
(
)
1
1 –
HOHP = –
(AC GAIN, f > fn); HOHPn = –
R2
R1
R2
R1
1
R2
R4
1 +
( ) (DCGAIN,f<fn)
HOBP = –
R3
R1
R3
6.42R4
(
)
1
1 –
; HOLP = HOHPn
Mode 3a
This is an extension of Mode 3 where the highpass and
lowpass output are summed through two external resis-
Figure 8. Mode 3a, 2nd Order Filter Providing a Highpass Notch or Lowpass Notch Output
+
Σ
AGND
R1
HP
BP
LP
VIN
1264 G08
+
S
R2
R3
R4
CC
+
EXTERNAL OP AMP OR
INPUT OP AMP OF THE
LTC1264, SIDES A, B, C, D
HIGHPASS
OR LOWPASS
NOTCH OUTPUT
RG
RL
RH
1/4 LTC1264
R2
R1
( )
RG
RH
()
fi =
; fn = fi
; fO = fi
HOHPn (f = ∞) =
; HOLPn (f = 0) =
fCLK
20
RH
RL
R2
R4
Q = 1.005
R3
R2
R2
R4
R3
6.42R4
(
)
1
1 –
( )
R4
R1
( )
RG
RL
()
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