參數(shù)資料
型號(hào)： LTC1562C-2
廠商： Linear Technology Corporation
英文描述： Advanced LinEPIC Self-Calibrating Precision Dual Operational Amplifier 20-LCCC -55 to 125
中文描述： 非常低噪聲，低失真有源RC四通用濾波器
文件頁數(shù)： 11/16頁
文件大小： 179K
代理商： LTC1562C-2
11
LTC1562-2
APPLICATIO
S I
FOR
ATIO
U
external component Z
IN
, usually a resistor or capacitor.
This component must of course be rated to sustain the
magnitude of voltage imposed on it.
W
U
U
Lowpass “T” Input Circuit
The virtual ground INV input in the Operational Filter
block provides a means for adding an “extra” lowpass
pole to any resistor-input application (such as the basic
lowpass, Figure 5, or bandpass, Figure 6a). The resistor
that would otherwise form Z
IN
is split into two parts and
a capacitor to ground added, forming an R-C-R “T”
network (Figure 9). This adds an extra, independent real
pole at a frequency:
f
R C
π
P
=
1
2
where C
T
is the new external capacitor and R
P
is the
parallel combination of the two input resistors R
INA
and
R
INB
. This pair of resistors must normally have a pre-
scribed series total value R
IN
to set the filter’s gain as
described above. The parallel value R
P
can however be set
arbitrarily (to R
IN
/4 or less) which allows choosing a
convenient standard capacitor value for C
T
and fine tuning
the new pole with R
P
.
INV
V1
2nd ORDER
1/4 LTC1562-2
V2
1562-2 F10
R2
R
Q
C
INB
R
T
V
IN
C
INA
Figure 10. Highpass “T” Input Circuit
A practical limitation of this technique is that the C
T
capaci-
tor values that tend to be required (hundreds or thousands
of pF) can destabilize the op amp in Figure 3 if R
INB
is too
small, leading to AC errors such as Q enhancement. For this
reason, when R
INA
and R
IN
B are unequal, preferably the
larger of the two should be placed in the R
INB
position.
Highpass “T” Input Circuit
A method similar to the preceding technique adds an
“extra” highpass pole to any capacitor-input application
(such as the bandpass of Figure 6b or the highpass of
Figure 7). This method splits the input capacitance C
IN
into
two series parts C
INA
and C
INB
, with a resistor R
T
to ground
between them (Figure 10). This adds an extra 1st order
highpass corner with a zero at DC and a pole at the
frequency:
f
R C
π
P
=
1
2
where C
P
= C
INA
+ C
INB
is the parallel combination of the
two capacitors. At the same time, the total series capaci-
tance C
IN
will control the filter’s gain parameter (H
H
in
Basic Highpass). For a given series value C
IN
, the parallel
value C
P
can still be set arbitrarily (to 4C
IN
or greater).
INV
V1
2nd ORDER
1/4 LTC1562-2
V2
1562-2 F09
R2
R
Q
R
INB
R
INA
C
T
V
IN
Figure 9. Lowpass “T” Input Circuit
The procedure therefore is to begin with the target extra
pole frequency f
P
. Determine the series value R
IN
from the
gain requirement. Select a capacitor value C
T
such that R
P
= 1/(2
π
f
P
C
T
) is no greater than R
IN
/4, and then choose
R
INA
and R
INB
that will simultaneously have the parallel
value R
P
and the series value R
IN
. Such R
INA
and R
INB
can
be found directly from the expression:
1
2
1
2
4
2
R
R
R R
IN
IN
±
(
)
–
The procedure then is to begin with the target corner (pole)
frequency f
P
. Determine the series value C
IN
from the gain
requirement (for example, C
IN
= H
H
(100pF) for a high-
pass). Select a resistor value R
T
such that C
P
= 1/(2
π
R
T
f
P
)
is at least 4C
IN
, and select C
INA
and C
INB
that will simulta-
neously have the parallel value C
P
and the series value C
IN
.
Such C
INA
and C
INB
can be found directly from the
expression:
1
2
1
2
4
2
C
C
C C
P
P
±
(
)
–
相關(guān)PDF資料
PDF描述
LTC1562CG Very Low Noise, Low Distortion Active RC Quad Universal Filter
LTC1562I Advanced LinEPIC Self-Calibrating Precision Dual Operational Amplifier 8-CDIP -55 to 125
LTC1562IG Advanced LinEPIC Self-Calibrating Precision Dual Operational Amplifier 10-CFP -55 to 125
LTC1563-2IGN Active RC, 4th Order Lowpass Filter Family
LTC1563-3IGN Active RC, 4th Order Lowpass Filter Family
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1562CG 功能描述:IC FILTER UNIVRSL RC QUAD 20SSOP RoHS:否 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)
LTC1562CG#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)
LTC1562CG#TR 功能描述:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:否 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)
LTC1562CG#TRPBF 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)
LTC1562CG-2 功能描述:IC FILTER UNIVRSL RC QUAD 20SSOP RoHS:否 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)
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*