參數(shù)資料
型號(hào)： ML2111
廠商： Fairchild Semiconductor Corporation
英文描述： Universal Dual High Frequency Filter(通用雙通道高頻濾波器)
中文描述： 通用雙高頻濾波器（通用雙通道高頻濾波器）
文件頁數(shù)： 19/26頁
文件大小： 440K
代理商： ML2111
ML2111
19
above the center frequency through the resistor ratio R
h
/
R
l
. Because of this, modes 3 and 3a are the most versatile
and useful modes for cascading second order sections to
obtain high order elliptic filters. For very selective
bandpass/bandreject filters the mode 3a approach , as in
Figure 24, yields better dynamic range since the external
op amp helps to optimize the dynamics of the output
nodes of the ML2111.
Modes 4 and 5 are useful for constructing allpass res-
ponse filters. Mode 4, Figure 25, gives an allpass
response, but due to the sampled nature of the filter, a
slight 0.5 dB peaking can occur around the center
Figure 26. Mode 4a: 2nd Order Filter Providing Highpass, Bandpass, Lowpass, Allpass — ML2111
f
f
R2
R
Q
R3
R2
R2
R
CLK
(
0
100 50
4
4
=
=
)
;
;
H
R
2
R
H
R2
R
OAP
OHP
=
= -
5
1
;
;
H
R
R
OLP
= -
4
1;
H
R3
R
OBP
= -
1
OPERATION MODES
(Continued)
Figure 25. Mode 4: 2nd Order Filter Providing Allpass, Bandpass, Lowpass — ML2111
+
+
Σ
BP
2 (19)
LP
1 (20)
V
IN
S1
A
5 (16)
V+
R1 = R2
S
A/B
6
15
AP
3 (18)
R3
R2
4 (17)
f
f
o
CLK
=
100 50
;
Q
R
R
=
3
2
;
H
R
R
OAP
=
-
2
1
;
H
OLP
= -
2
;
H
R
R
OBP
=
-
2
3
2
frequency. Mode 4a (Figure 26) gives a non-inverting
output, but requires an external op amp. Mode 5 is
recommended if this response is unacceptable. Mode 5
(Figure 27) gives a flatter response than mode 4 if R1 = R2
= 0.02
′
R4.
Modes 6 and 7 are used to construct 1st order filters.
Mode 6a (Figure 28) gives a lowpass and a highpass
single pole response. Mode 6b (Figure 29) gives an
inverting and non-inverting lowpass single pole filter
response. Mode 7 (Figure 30) gives an allpass and lowpass
single pole response.
+
+
LP
1 (20)
V
IN
V-
R1
S
A/B
6
15
R3
R2
4 (17)
R4
+
Σ
BP
2 (19)
S1
A
5 (16)
HP
3 (18)
2R
R5
R
External
Op Amp
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