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| 型号： | MAX7403CPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 滤波器类型： | 椭圆，低通开关电容器 |
| 频率 - 截止或中心： | 10kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 8th |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
VDD
VSUPPLY
IN
CLK
GND
INPUT
OUTPUT
50k
OUT
0.1
F
0.1
F
0.1
F
CLOCK
SHDN
COM
OS
MAX7400
MAX7403
MAX7404
MAX7407
Figure 4. Offset Adjustment Circuit
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
10
______________________________________________________________________________________
Clock Signal
External Clock
The MAX7400/MAX7403/MAX7404/MAX7407 SCFs
were designed for use with external clocks that have a
40% to 60% duty cycle. When using an external clock,
drive CLK with a CMOS gate powered from 0 to VDD.
Varying the rate of the external clock adjusts the filter
corner frequency:
fC = fCLK / 100
Internal Clock
When using the internal oscillator, the capacitance
(COSC) on the CLK pin determines the oscillator fre-
quency:
where K = 38 for the MAX7400/MAX7403, and K = 34
for the MAX7404/MAX7407. Since the capacitor value
is in picofarads, minimize the stray capacitance at CLK
so that it does not affect the internal oscillator frequen-
cy. Varying the rate of the internal oscillator adjusts the
filter’s corner frequency by a 100:1 clock-to-corner fre-
quency ratio. For example, an internal oscillator fre-
quency of 100kHz produces a nominal corner
frequency of 1kHz.
Input Impedance
vs. Clock Frequencies
The MAX7400/MAX7403/MAX7404/MAX7407’s input
impedance is effectively that of a switched-capacitor
resistor and is inversely proportional to frequency. The
input impedance determined by the following equation
represents the average input impedance, since the
input current is not continuous. As a rule, use a driver
with an output source impedance less than 10% of the
filter’s input impedance. Estimate the input impedance
of the filter using the following formula:
where fCLK = clock frequency and CIN = 0.85pF.
Low-Power Shutdown Mode
These devices feature a shutdown mode that is activat-
ed by driving SHDN low. Placing the filter in shutdown
mode reduces the supply current to 0.2A (typ) and
places the output of the filter into a high-impedance
state. For normal operation, drive SHDN high or con-
nect to VDD.
Applications Information
Offset and Common-Mode
Input Adjustment
The voltage at COM sets the common-mode input volt-
age and is internally biased at midsupply by a resistor-
divider. Bypass COM with a 0.1F capacitor and
connect OS to COM. For applications requiring offset
adjustment or DC level shifting, apply an external bias
voltage through a resistor-divider network to OS, as
shown in Figure 4. (Note: Do not leave OS unconnect-
ed.) The output voltage is represented by the following
equation:
VOUT = (VIN - VCOM) + VOS
Z
fC
IN
CLK
IN
()
(
)
=
1
f
(kHz) =
K
10
C
OSC
3
OSC
; Cin pF
OSC
PASSBAND
STOPBAND
GAIN
(dB)
FREQUENCY
fC
fS
fC
fS
fC
TRANSITION RATIO =
RIPPLE
Figure 3. Elliptic Filter Response
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7403CPA+ | 功能描述:有源滤波器 8th-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 |
| MAX7403CSA | 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 |
| MAX7403CSA+ | 功能描述:有源滤波器 8th-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 |
| MAX7403CSA+T | 功能描述:有源滤波器 8th-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 |
| MAX7403CSA-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 |
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