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| 型号： | MAX7420EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/14页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 5TH 8UMAX |
| 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： | 巴特沃斯，低通开关电容器 |
| 频率 - 截止或中心： | 45kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 5th |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
| 配用： | MAXFILTERBRD+-ND - BOARD EVAL MAX7408/7415/418-7425 |
MAX7418–MAX7425
5th-Order, Lowpass,
Switched-Capacitor Filters
______________________________________________________________________________________
11
Internal Clock
When using the internal oscillator, the capacitance
(COSC) on CLK determines the oscillator frequency:
where
k=87x103 for the
MAX7418/MAX7421/MAX7422/MAX7425
and
k=110X103 for the
MAX7419/MAX7420/MAX7423/ MAX7424.
Since COSC is in the low picofarads, minimize the stray
capacitance at CLK so that it does not affect the inter-
nal oscillator frequency. Varying the rate of the internal
oscillator adjusts the filter’s corner frequency by a
100:1 clock-to-corner frequency ratio. For example, an
internal oscillator frequency of 2.2kHz produces a nom-
inal corner frequency of 2.2MHz.
Input Impedance vs. Clock Frequencies
The MAX7418–MAX7425s’ input impedance is effective-
ly that of a switched-capacitor resistor (see the following
equation), and is inversely proportional to frequency.
The input impedance values determined by the equa-
tion represent the average input impedance, since the
input current is not continuous. As a rule, use a driver
with an output resistance less than 10% of the filter’s
input impedance.
Estimate the input impedance of the filter by using the
following formula:
where fCLK = clock frequency and CIN = 1pF.
Low-Power Shutdown Mode
The MAX7418–MAX7425 have a shutdown mode that is
activated by driving
SHDN low. In shutdown mode, the
filter supply current reduces to 0.2A, and the output of
the filter becomes high impedance. For normal opera-
tion, drive
SHDN high or connect to VDD.
Applications Information
Offset (OS) and Common-Mode (COM)
Input Adjustment
COM sets the common-mode input voltage and is
biased at midsupply with an internal resistor-divider. If
the application does not require offset adjustment, con-
nect OS to COM. For applications in which offset
adjustment is required, apply an external bias voltage
through a resistor-divider network to OS, as shown in
Figure 4. For applications that require DC level shifting,
adjust OS with respect to COM. (Note: Do not leave OS
unconnected.) The output voltage is represented by
these equations:
where (VIN - VCOM) is lowpass filtered by the SCF and
OS is added at the output stage. See the
Electrical
VV
V
typical
OUT
IN
COM
OS
COM
DD
(
)
()
=
+
=
2
Z
1
(f
C )
IN
CLK
IN
=
×
fOSC(kHz)
k
COSC(pF)
=
VDD
VSUPPLY
IN
CLK
GND
INPUT
OUTPUT
50k
OUT
0.1
μF
0.1
μF
0.1
μF
CLOCK
SHDN
COM
OS
MAX7418–
MAX7425
Figure 4. Offset Adjustment Circuit
A
2V/div
C
A: 1kHz INPUT SIGNAL
B: MAX7419 BESSEL FILTER RESPONSE; fC = 5kHz
C: MAX7420 BUTTERWORTH FILTER RESPONSE; fC = 5kHz
B
200
μs/div
Figure 3. Bessel vs. Butterworth Filter Response
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7421CUA | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7421CUA+ | 功能描述:有源滤波器 5th-Order Lowpass Elliptic Filter RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7421CUA+T | 功能描述:有源滤波器 5th-Order Lowpass Elliptic Filter RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7421CUA-T | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7421EUA | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
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