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參數(shù)資料
| 型號(hào)： | LTC1562I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Advanced LinEPIC Self-Calibrating Precision Dual Operational Amplifier 8-CDIP -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)： | 8/16頁 |
| 文件大?。?/td> | 179K |
| 代理商： | LTC1562I |
8
LTC1562-2
tend to scale with R2.)
At high f
O
these resistors fall below
4k, heavily loading the outputs of the LTC1562-2 and
leading to increased THD and other effects. At the other
extreme, a lower f
O
limit of 20kHz reflects an arbitrary
upper resistor limit of 1M
. The LTC1562-2’s MOS input
circuitry can accommodate higher resistor values than
this, but junc
tion leakage current from the input protection
circuitry may cause DC errors.
The 2nd order transfer functions H
LP
(s), H
BP
(s) and
H
HP
(s) (below) are all inverting so that, for example, at DC
the lowpass gain is –H
L
. If two such sections are cas-
caded, these phase inversions cancel. Thus, the filter in the
application schematic on the first page of this data sheet
is a dual DC preserving, noninverting, rail-to-rail lowpass
filter, approximating two “straight wires with frequency
selectivity.”
Figure 4 shows further details of 2nd order lowpass,
bandpass and highpass responses. Configurations to
obtain these responses appear in the next three sections.
Basic Lowpass
When Z
IN
of Figure 3 is a resistor of value R
IN
, a standard
2nd order lowpass transfer function results from V
IN
to V2
(Figure 5):
V( )
V( )
H
s
H
s
Q s
)
+
LP
L
/
O
O
O
2
2
2
2
( )
–
=
=
+
(
ω
ω
ω
H
L
= R2/R
IN
is the DC gain magnitude. (Note that the
transfer function includes a sign inversion.) Parameters
APPLICATIO
S I
N
FOR
ATIO
U
W
U
f
L
G
0.707 H
B
H
B
f
O
f (LOG SCALE)
BANDPASS RESPONSE
f
H
G
0.707 H
L
H
P
H
L
H
H
f
P
f (LOG SCALE)
LOWPASS RESPONSE
f
C
f
C
1562-2 F04
G
0.707 H
H
H
P
f
P
f (LOG SCALE)
HIGHPASS RESPONSE
Q
f
f
f
f
f f
L H
f
f
Q
Q
f
f
Q
Q
O
–
H
L
O
L
O
H
O
=
=
=
+
=
+
;
–1
2
1
2
1
1
2
1
2
1
2
2
f
f
Q
1
Q
f
f
Q
H
H
Q
Q
C
O
P
O
P
L
=
=
=
1
1
2
1
1
2
1
1
2
1
1
1
1
4
2
2
2
2
2
–
–
–
–
f
f
Q
Q
f
f
Q
H
H
Q
Q
C
O
P
O
P
H
=
=
=
1
1
2
1
1
2
1
1
1
2
1
1
1
1
4
2
2
2
1
2
1
2
–
–
–
–
–
–
Figure 4. Characteristics of Standard 2nd Order Filter Responses
INV
V1
2nd ORDER
1/4 LTC1562-2
V2
1562 F05
R2
R
Q
R
IN
V
IN
V
OUT
Figure 5. Basic Lowpass Configuration
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