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參數(shù)資料
| 型號： | MAX7491 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual Universal Switched-Capacitor Filters |
| 中文描述： | 雙路、通用開關(guān)電容濾波器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 343K |
| 代理商： | MAX7491 |
M
Dual Universal Switched-Capacitor Filters
______________________________________________________________________________________
13
Mode 3
Figure 6 shows the configuration of Mode 3. This mode
is a sampled time (Z transform) equivalent of the classi-
cal 2nd-order state variable filter. In this versatile mode,
the ratio of resistors R2 and R4 can move the center
frequency both above and below the nominal ratio.
Mode 3 is commonly used to make multiple-pole
Chebyshev filters with a single clock frequency. This
mode can also be used to make high-order all-pole
bandpass, lowpass, and highpass filters.
Mode 3 Design Equations
Mode 3A
Figure 7 shows the configuration of Mode 3A. Similar to
Mode 2, this mode adds an external op amp. See
Table 3 for op amp selection ideas. This op amp cre-
ates a highpass notch and lowpass notch by summing
the highpass and lowpass outputs through two external
resistors, R
H
and R
L
. The ratio of resistors R
H
and R
L
adjusts the notch frequency, while R2 and R4 adjust
the bandpass center frequency, since the notch (zero
pair) frequency can be adjusted to both above and
below f
O
. Mode 3A is suitable for both lowpass and
highpass elliptic or Cauer filters. In multipole elliptic fil-
ters, only one external op amp is needed. Use the
inverting input of the internal op amp as the summing
node for all but the final section of the filter.
fO
fCLK
100
3
2
R
R
Q
R
R
R
R
HOHP
R
R
R
R
R
R
HOLP
HOBP
=
=
=
=
=
2
4
2
4
2
1
4
1
3
1
Σ
∫
∫
LP
BP
HP
R3
R4
R2
R1
VIN
CC
COM
+
-
S
COM
Figure 6. Mode 3, 2nd-Order Section Providing Highpass,
Bandpass, and Lowpass Outputs
Σ
LP
BP
N/HP
R3
R4
R2
R1
V
IN
C
C
COM
COM
LOWPASS
NOTCH
OUTPUT
+
-
R
H
R
L
R
G
S
COM
Figure 7. Mode 3A, 2nd-Order Filter Providing Highpass Notch or Lowpass Notch Outputs
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX7490-MAX7491 | Dual Universal Switched-Capacitor Filters |
| MAX7491CEE | SILICON CONTROLLED RECTIFIER,400V V(DRM),70A I(T),TO-209AA RoHS Compliant: Yes |
| MAX7490CEE | Dual Universal Switched-Capacitor Filters |
| MAX7490EEE | Dual Universal Switched-Capacitor Filters |
| MAX7491EEE | 4-Bit D-type Registers with 3-State Outputs 16-CDIP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7491CEE | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7491CEE+ | 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7491CEE+T | 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7491CEE-T | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7491EEE | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
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