參數(shù)資料
型號: MAX261BEWG+T
廠商: Maxim Integrated Products
文件頁數(shù): 10/26頁
文件大小: 0K
描述: IC FILTER ACT MPU PROG 24-SOIC
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 1,000
濾波器類型: 通用開關(guān)電容器
頻率 - 截止或中心: 57kHz
濾波器數(shù): 2
濾波器階數(shù): 2nd
電源電壓: 4.74 V ~ 12.6 V,±2.37 V ~ 6.3 V
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC W
包裝: 帶卷 (TR)
MAX260/MAX261/MAX262
Microprocessor Programmable
Universal Active Filters
18
______________________________________________________________________________________
Description of Filter Functions
BANDPASS (Figure 12)
For all pole bandpass and lowpass filters (Butterworth,
Bessel, Chebyshev) use mode 1 if possible. If appropri-
ate fCLK/f0 or Q values are not available in mode 1,
mode 2 provides a selection that is closer to the
required values. Mode 1, however, has the highest
bandwidth (see Table 1). For pole-zero filters, such as
elliptics, see mode 3A.
HOBP = Bandpass output gain at
ω = ωo
f0 = ω0 / 2
π = The center frequency of the complex
pole pair. Input-output phase shift is -180° at f0.
Q = The quality factor of the complex pole pair.
Also the ratio of f0 to -3dB bandwidth of the
second-order bandpass response.
LOWPASS See bandpass text. (Figure 13)
HOLP = Lowpass output gain at DC
f0 = ω0 / 2
π
HIGHPASS (Figure 14)
Mode 3 is the only mode with a highpass output. It
works for all pole filter types such as Butterworth,
Bessel and Chebyshev. Use mode 3A for filters
employing both poles and zeros, such as elliptics.
HOHP = Highpass output gain as f approaches fCLK/4
f0 =
ω0 / 2π
NOTCH (Figure 15)
Mode 3A is recommended for multi-pole notch filters. In
second-order filters, mode 1 can also be used. The
advantages of mode 1 are higher bandwidth, com-
pared to mode 3 (higher fN can be implemented), and
no need for external components as required in mode
3A.
HON2 = Notch output gain as f approaches fCLK/4
HON1 = Notch output gain as f approaches DC
fn =
ωn / 2π
ALLPASS
Mode 4 is the only configuration in which an allpass
function can be realized.
Gs
H
s
ss
Q
ON
n
oo
()
(
/
)
=
+
++
2
ω
ωω
Gs
H
s
ss
Q
OHP
oo
()
(
/
)
=
++
2
ωω
Gs
H
ss
Q
OLP
o
oo
()
(
/
)
=
++
ω
ωω
2
Gs
H
sQ
ss
Q
OBP
o
oo
()
(
/
)
(
/
)
=
++
ω
ωω
2
SCN
IN
SCN
AP
LP
+
-
MODE 4
BP
+
-
SCN
Σ
SCN = SWITCHED-CAPACITOR NETWORK
Figure 11. Filter Mode 4: Second-Order Bandpass, Lowpass,
and Allpass
fL
fO
fH
HOBP
0.707 HOBP
BANDPASS OUTPUT
f(LOG SCALE)
GAIN
(V/V)
Figure 12. Second-Order Bandpass Characteristics
Q
f
ff
f
ff
QQ
ff
QQ
O
HL
Of f
LO
HO
LH
,
=
=
+
+
=+
+
=
1
2
1
2
1
2
1
2
1
2
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