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參數資料
| 型號： | MAX7490EEE+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 5/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTER SW CAP DUAL 16-QSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 100 |
| 濾波器類型： | 通用開關電容器 |
| 頻率 - 截止或中心： | 40kHz |
| 濾波器數： | 2 |
| 濾波器階數： | 2nd |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-QSOP |
| 包裝： | 管件 |
| 產品目錄頁面： | 1424 (CN2011-ZH PDF) |
MAX7490/MAX7491
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, RH and RL. The ratio of resistors RH and RL
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 fO. 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 R
R
Q
R
HOHP
R
HOLP
R
HOBP
R
=
100
2
4
3
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
VIN
CC
COM
LOWPASS
NOTCH
OUTPUT
+
-
RH
RL
RG
S
COM
Figure 7. Mode 3A, 2nd-Order Filter Providing Highpass Notch or Lowpass Notch Outputs
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX7490EEE+ | 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數量: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 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7490EEE+T | 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數量: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 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7490EEE-T | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數量: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 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7491CEE | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數量: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 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
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