參數(shù)資料
型號: LTC1067IGN#TR
廠商: Linear Technology
文件頁數(shù): 3/20頁
文件大?。?/td> 0K
描述: IC FILTR BLD BLK DUAL R-R 16SSOP
標(biāo)準(zhǔn)包裝: 2,500
濾波器類型: 通用開關(guān)電容器
頻率 - 截止或中心: 20kHz
濾波器數(shù): 2
濾波器階數(shù): 4th
電源電壓: 3 V ~ 11 V,±3 V ~ 5.5 V
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SSOP
包裝: 帶卷 (TR)
11
LTC1067/LTC1067-50
ODES OF OPERATIO
U
W
Mode 3a
This is an extension of Mode 3 where the highpass and
lowpass outputs are summed through two external resis-
tors, RH and RL, to create a notch (see Figure 7). Mode 3a
is more versatile than Mode 2 because the notch fre-
quency can be higher or lower than the center frequency
of the 2nd order section. The external op amp of Figure 7
is not always required. When cascading the sections of the
LTC1067, the highpass and lowpass outputs can be
summed directly into the inverting input of the next
section.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
Figure 7. Mode 3a, 2nd Order Filter Providing a Highpass Notch or Lowpass Notch Output
Mode 2n
This mode extends the circuit topology of Mode 3a to
Mode 2 (Figure 8) 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 LTC1067, the highpass-
notch and lowpass outputs can be summed directly into
the inverting input of the next section.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
Figure 8. Mode 2n, 2nd Order Filter Providing a Lowpass Notch Output
+
Σ
AGND
R1
HP
BP
LP
VIN
1067 F07
+
S
R2
R3
R4
CC
+
EXTERNAL OP AMP OR INPUT OP
AMP OF THE LTC1067, SIDES A OR B
HIGHPASS
OR LOWPASS
NOTCH OUTPUT
RG
RL
RH
R2
R1
( )
RG
RH
()
fO =
; fn =
HOHPn (f = ∞) =
; HOLPn (f = 0) =
fCLK
RATIO
fCLK
RATIO
RH
RL
R2
R4
Q = 1.005
R3
R2
R2
R4
( )
R4
R1
( )
RG
RL
()
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
+
Σ
AGND
R1
HP
BP
LP
VIN
1067 F08
+
S
R2
R3
R4
CC
+
EXTERNAL OP AMP OR INPUT OP AMP
OF THE LTC1067, SIDES A OR B
LOWPASS
NOTCH
OUTPUT
RG
RL
RH
fO =
fn =
HOLPn (f = 0)=
+
fCLK
RATIO
fCLK
RATIO
RH
RL
1 +
R2
R1
RG
RL
RG
RH
()
1
R2
R4
1 +
( )
R2
R4
1 +
Q = 1.005
R3
R2
( )√ R2
R4
1 +
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
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