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参数资料
| 型号： | MAX7491EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC FILTER SW CAP DUAL 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 滤波器类型： | 通用开关电容器 |
| 频率 - 截止或中心： | 40kHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 2nd |
| 电源电压： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
MAX7490/MAX7491
Dual Universal Switched-Capacitor Filters
______________________________________________________________________________________
11
Mode 1
Figure 2 shows the MAX7490/MAX7491s’ configuration
of Mode 1. This mode provides 2nd-order notch, low-
pass, and bandpass filter functions. The gain at all
three outputs is inversely proportional to the value of
R1. The center frequency, fO, is fixed at fCLK/100. High-
Q bandpass filters can be built without exceeding the
bandpass amplifier’s output swing (i.e., HOBP does not
have to track Q). The notch and bandpass center fre-
quencies are identical. The notch output gain is the
same above and below the notch center frequency.
Mode 1 can also be used to make high-order Butter-
worth lowpass filters, low Q notches, and multiple-order
bandpass filters obtained by cascading identical
switched-capacitor sections.
Mode 1 Design Equations
Mode 1B
Figure 3 shows the configuration of Mode 1B. R5 and
R6 are added to lower the feedback voltage from the
lowpass output to the summing input. This allows the
clock-to-center frequency to be adjusted beyond the
nominal value. This mode essentially has the same
functions and speed as Mode 1 while providing a high-
Q with fCLK/fO ratios greater than the nominal value.
Mode 1B Design Equations
Mode 2
Figure 4 shows the configuration of Mode 2. Mode 2 is
a combination of Mode 1 and Mode 3. In this mode,
fCLK/fO is always less than the part’s nominal ratio.
However, it provides less sensitivity to resistor toler-
ances than does Mode 3. It has a highpass notch out-
put where the notch frequency depends solely on the
clock frequency.
f
R
RR
ff
Q
R
RR
H
R
RR
R
H
R
Has f
Hz
R
Hat f
f
R
O
CLK
nO
OLP
OBP
ON
CLK
=
+
=
+
=
+
=
→=
==
100
6
65
3
2
6
65
2
1
65
6
3
1
0
2
1
2
1
2
()
(/ )
f
ff
Q
R
H
R
H
R
Has f
Hz
R
Hat f
f
R
O
CLK
notch
O
OLP
OBP
ON
CLK
=
→=
==
100
3
2
1
3
1
0
2
1
2
1
2
()
(/ )
Σ
∫
LP
BP
S
N
R3
R2
R1
VIN
CC
COM
+
-
Figure 2. Mode 1, 2nd-Order Filter Providing Notch, Bandpass,
and Lowpass Outputs
Σ
∫
LP
BP
S
N
R3
R6
R5
R2
R1
VIN
CC
COM
+
-
Figure 3. Mode 1B, 2nd-Order Filter Providing Notch, Bandpass,
and Lowpass Outputs
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX749C/D | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX749CPA | 功能描述:显示驱动器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX749CPA+ | 功能描述:显示驱动器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX749CPA+T | 制造商:Maxim Integrated Products 功能描述: |
| MAX749CSA | 功能描述:显示驱动器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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