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參數(shù)資料
| 型號(hào)： | LTC1562CN |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTER UNIV RC QUAD LN 16DIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 濾波器類型： | 通用連續(xù)計(jì)時(shí) |
| 頻率 - 截止或中心： | 150kHz |
| 濾波器數(shù)： | 4 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | 4.75 V ~ 10.5 V，±4.75 V ~ 5.25 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-PDIP |
| 包裝： | 管件 |
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23
LTC1562
1562fa
R-C Universal Notches
A different way to get 180
° phase shift for a notch is to use
the built-in 90
° phase difference between the two Opera-
tional Filter block outputs along with a further 90
° from an
external capacitor. This method achieves deep notches
independent of component matching, unlike the previous
techniques, and it is convenient for cascaded highpass as
well as lowpass and bandpass filters.
The V2 output of an Operational Filter block is a time-
integrated version of V1 (see Figure 3), and therefore lags
V1 by 90
° over a wide range of frequencies. In Figure 16,
a notch response occurs when a 2nd order section drives
a virtual-ground input through two paths, one through a
capacitor and one through a resistor. Again, the virtual
ground may come from an op amp as shown, or from
another Operational Filter block’s INV input. Capacitor CN
adds a further 90
° to the 90° difference between V1 and
V2, producing a wideband 180
° phase difference, but
frequency-dependent amplitude ratio, between currents
IR and IC. At the frequency where IR and IC have equal
magnitude, IO becomes zero and a notch occurs. This
gives a net transfer function from VIN to VOUT in the form
of HBR(s) as above, with parameters:
=
π
=
N
NN
N
GAIN
IN
N
RC R C
H
R
C
1
21
1
–
APPLICATIONS INFORMATION
WU
U
DC Gain
R
High Frequency Gain
DC Gain
RC
GAIN
IN
N
O
N
NN
=
==
1
2
21
R1 and C are the internal precision components (in the
LTC1562, 10k and 159pF respectively) as described above
in Setting f0 and Q.
Unlike the notch methods of Figures 11 and 14, notch
depth from Figure 16 is inherent, not derived from compo-
nent matching. Errors in the RN or CN values alter the notch
frequency, fN, rather than the degree of cancellation at fN.
Also, the notch frequency, fN,isindependentofthesection’s
center frequency f0, so fN can freely be equal to, higher
than or lower than f0 (Figures 12, 13 or 15, respectively)
without changing the configuration. The chief drawback of
Figure 16 compared to the previous methods is a very
practical one—the CN capacitor value directly scales HN
(and therefore the high frequency gain). Capacitor values
are generally not available in increments or tolerances as
fine as those of resistors, and this configuration lacks the
property of the previous two configurations that sensitiv-
ity to the capacitor value falls as fN approaches f0. Unlike
the previous notch circuits, this one is also noninverting at
DC.
Figure 16. The R-C Universal Notch Configuration for an Operational Filter Block
INV
V1
2nd ORDER
1/4 LTC1562
V2
R21
RQ1
RIN1
RN
RGAIN
IO
CN
VIN
VOUT
1562 F16
VIRTUAL
GROUND
–
+
IR
IC
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| LTC1562IG#PBF | 功能描述:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時(shí)間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
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