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參數(shù)資料
| 型號： | 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)： | 18/26頁 |
| 文件大小： | 440K |
| 代理商： | ML2111 |
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ML2111
18
OPERATION MODES
(Continued)
The clock to center frequency ratio range is:
500
1
100
1
50
1
0
f
f
or
CLK
(mode 1c)
(6)
100
1
50
1
100
2
50
2
0
or
f
f
or
CLK
(mode 1b)
(7)
The input impedance of the S1 pin is clock dependent,
and in general R5 should not be larger than 5k
W
for f
CLK
<
2.5MHz and 2k
W
for f
CLK
> 2.5MHz. Mode 1c can be
used to increase the clock-to-center-frequency ratio
beyond 100:1. The limit for the (f
CLK
/f
0
) ratio is 500:1 for
this mode. The filter will exhibit large output offsets with
larger ratios. Mode 1d (Figure 19) is the fastest mode of
operation: center frequencies beyond 20kHz can easily
be achieved at a 50:1 ratio.
Modes 2, 2a, and 2b (Figures 20, 21, and 22) have notch
outputs whose frequency, f
n
, can be tuned independently
from the center frequency, f
0
. However, for all cases f
n
<
f
0
. These modes are useful when cascading second order
functions to create an overall elliptic highpass, bandpass
or notch response. The input amplifier and its feedback
resistors R2 and R4 are now part of the resonant loop.
Because of this, mode 2 and its derivatives are slower
than mode 1 and its derivatives.
In Mode 3 (Figure 23) a single resistor ratio, R2/R4, can
tune the center frequency below or above the f
CLK
/100 (or
f
CLK
/50) ratio. Mode 3 is a state variable configuration
since it provides a highpass, bandpass, lowpass output
through progressive integration. Notches are acquired by
summing the highpass and lowpass outputs (mode 3a,
Figure 24). The notch frequency can be tuned below or
Figure 24. Mode 3a: 2nd Order Filter Providing Highpass, Bandpass, Lowpass, Notch — ML2111
f
f
R2
R
Q
R3
R2
R2
R
CLK
(
0
100 50
4
4
=
=
)
;
;
H
R2
R
H
R
R
H
R3
R
OHP
OLP
OBP
= -
= -
= -
1
4
1
1
;
;
Figure 23. Mode 3: 2nd Order Filter Providing Highpass, Bandpass, Lowpass — ML2111
+
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)
Q
R2
R
R3
R2
=
4
f
f
R2
R
f
f
R
R
CLK
(
n
CLK
(
h
l
0
100 50
4
100 50
=
=
)
;
)
;
H
R2
R
H
R3
R
H
R
R
OHP
OBP
OLP
= -
= -
= -
1
1
4
1
;
;
;
H
f
f
Q
R
R
H
R
R
H
ON
g
l
OLP
g
h
OHP
=
=
-
0
1
6
;
H
f
f
R
R
R2
R
ON
CLK
2
g
h
2
1
=
;
H
f
R
R
R
R
ON
g
l
1
0
4
1
=
1
6
+
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)
R
h
R
g
R
l
External
Op Amp
NOTCH
+
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