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參數(shù)資料
| 型號(hào)： | MAX7418CUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 5th-Order, Lowpass, Switched-Capacitor Filters |
| 中文描述： | SWITCHED CAPACITOR FILTER, ELLIPTIC, LOWPASS, PDSO8 |
| 封裝： | MICRO MAX PACKAGE-8 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 407K |
| 代理商： | MAX7418CUA |
M
5th-Order, Lowpass,
Switched-Capacitor Filters
______________________________________________________________________________________
11
Internal Clock
When using the internal oscillator, the capacitance
(C
OSC
) on CLK determines the oscillator frequency:
where
k = 87 x 10
3
for the
MAX7418/MAX7421/MAX7422/MAX7425
and
k = 110 x 10
3
for the
MAX7419/MAX7420/MAX7423/ MAX7424.
Since C
OSC
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 2.2MHz produces a
nominal corner frequency of 2.2kHz.
Input Impedance vs. Clock Frequencies
The MAX7418–MAX7425s’ input impedance is effective
as a switched-capacitor resistor and is inversely propor-
tional to frequency. The input impedance values deter-
mined by the equation represents 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 f
CLK
= clock frequency and C
IN
= 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 0.2μA, and the output of
the filter becomes high impedance. For normal opera-
tion, drive
SHDN
high or connect to V
DD
.
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 (V
IN
- V
COM
) is lowpass filtered by the SCF and
OS is added at the output stage. See the
Electrical
Characteristics
table for the input voltage range of COM
V
V
V
V
V
V
typ
(
OUT
IN
COM
OS
COM
DD
2
(
)
)
+
=
Z
1
×
(f
C )
CLK
=
fOSC(kHz)
k
COSC(pF)
=
V
DD
V
SUPPLY
IN
CLK
GND
INPUT
OUTPUT
50k
50k
50k
OUT
COM
0.1
μ
F
0.1
μ
F
0.1
μ
F
CLOCK
SHDN
OS
MAX7418
–
MAX7425
Figure 4. Offset Adjustment Circuit
A
2V/div
2V/div
2V/div
C
A: 1kHz INPUT SIGNAL
B: MAX7419 BESSEL FILTER RESPONSE; f
C
= 5kHz
C: MAX7420 BUTTERWORTH FILTER RESPONSE; f
C
= 5kHz
B
200
μ
s/div
Figure 3. Bessel vs. Butterworth Filter Response
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7418CUA+ | 功能描述:有源濾波器 5th-Order Lowpass Elliptic Filter 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 |
| MAX7418CUA+T | 功能描述:有源濾波器 5th-Order Lowpass Elliptic Filter 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 |
| MAX7418CUA-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 |
| MAX7418EUA | 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 |
| MAX7418EUA+ | 功能描述:有源濾波器 5th-Order Lowpass Elliptic Filter 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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