参数资料
型号: LTC1067-50CGN
厂商: Linear Technology
文件页数: 2/20页
文件大小: 0K
描述: IC FILTR BLDNGBLK R-R DUAL16SSOP
标准包装: 100
滤波器类型: 通用开关电容器
频率 - 截止或中心: 40kHz
滤波器数: 2
滤波器阶数: 4th
电源电压: 2.7 V ~ 11 V,±2.7 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
10
LTC1067/LTC1067-50
ODES OF OPERATIO
U
W
The parallel combination of R5 and R6 should be kept
below 5k.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
Mode 3
In Mode 3, the ratio of the external clock frequency to the
center frequency of each 2nd order section can be ad-
justed above or below the part’s nominal ratio. Figure 5
illustrates Mode 3, the classical state variable configura-
tion, providing highpass, 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 highpass filters.
Please refer to the Operating Limits paragraph under Appli-
cations 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 6. 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
highpass-notch output where the notch frequency
depends solely on the clock frequency and is therefore
less than the center frequency, fO.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
+
Σ
AGND
R1
HP
BP
LP
VIN
1067 F05
+
S
R2
R3
CC
R4
fO =
fCLK
RATIO
HOHP = –
; HOBP = –
;
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
R2
R1
R3
R1
R4
R1
HOLP = –
R3
R2
R2
R4
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
( )
R2
R4
; Q = 1.005
Figure 5. Mode 3, 2nd Order Section Providing
Highpass, Bandpass and Lowpass Outputs
Figure 6. Mode 2, 2nd Order Filter Providing Highpass
Notch, Bandpass and Lowpass Outputs
+
Σ
AGND
R1
N
BP
LP
VIN
1067 F04
+
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)
()
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
Figure 4. Mode 1b, 2nd Order Filter Providing Notch,
Bandpass and Lowpass Outputs
+
Σ ∫
AGND
R1
HPN
BP
LP
VIN
1067 F06
+
S
R2
R3
CC
R4
fO =
; fn =
fCLK
RATIO
R2
R4
1 +
fCLK
RATIO
Q = 1.005
R3
R2
( )√ R2
R4
1 +
HOHPN = –
(AC GAIN, f >> fO); HOHPN = –
R2
R1
R2
R1
R2
R1
1
R2
R4
1 +
( ) (DCGAIN)
HOBP = –
R3
R1
; HOLP = –
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
R3
(RATIO)(0.32)(R4)
(
)
1
1 –
1
R2
R4
1 +
( )
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