參數(shù)資料
型號(hào): MAX7491EEE+T
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 4/18頁(yè)
文件大?。?/td> 0K
描述: IC FILTER SW CAP DUAL 16-QSOP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 2,500
濾波器類(lèi)型: 通用開(kāi)關(guān)電容器
頻率 - 截止或中心: 40kHz
濾波器數(shù): 2
濾波器階數(shù): 2nd
電源電壓: 2.7 V ~ 3.6 V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-QSOP
包裝: 帶卷 (TR)
MAX7490/MAX7491
Dual Universal Switched-Capacitor Filters
12
______________________________________________________________________________________
Mode 2 Design Equations
Mode 2N
Figure 5 shows the configuration of Mode 2N. This
mode extends the topology of Mode 3A to Mode 2,
where the highpass and lowpass outputs are summed
through two external resistors, RH and RL, to create a
lowpass notch filter that has higher frequency than the
one in Mode 2. Mode 2 is most useful in lowpass elliptic
designs. When cascading the sections of the
MAX7490/MAX7491, the highpass and lowpass outputs
can be summed directly into the inverting input of the
next section. Only one external op amp is needed.
Mode 2N Design Equations
f
R
f
fR
R
Q
R
Hf
Hz
R
RR
O
CLK
n
CLK
H
L
ON
G
H
G
L
=+
→=
+
+
100
1
2
4
100
1
3
2
1
2
4
0
2
1
4
42
1()
f
R
f
Q
R
H
R
RR
H
R
Hf
Hz
R
RR
Hat f
f
R
O
CLK
n
CLK
OLP
OBP
ON
CLK
=+
=
=+
=
+
=
→=
+
==
100
1
2
4
100
3
2
1
2
4
2
1
4
42
3
1
0
2
1
4
42
2
1
2
()
(/ )
Σ
LP
BP
S
HP/N
R3
R4
R2
R1
VIN
CC
COM
LOWPASS
NOTCH
OUTPUT
+
-
RH
RL
RG
Figure 5. Mode 2N, 2nd-Order Filter Providing a Lowpass Notch Output
Σ
LP
BP
S
HP/N
R3
R4
R2
R1
VIN
CC
COM
+
-
Figure 4. Mode 2, 2nd-Order Filter Providing a Highpass
Notch, Bandpass, and Lowpass Outputs
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