參數(shù)資料
型號(hào)： MAX7426CUA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125
中文描述： SWITCHED CAPACITOR FILTER, ELLIPTIC, LOWPASS, PDSO8
封裝： MICRO MAX PACKAGE-8
文件頁(yè)數(shù)： 9/12頁(yè)
文件大?。?/td> 209K
代理商： MAX7426CUA
M
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
_______________________________________________________________________________________
9
powered from 0 to V
DD
. Varying the rate of the external
clock adjusts the corner frequency of the filter:
Internal Clock
When using the internal oscillator, the capacitance
(C
OSC
) on CLK determines the oscillator frequency:
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 100kHz produces a
nominal corner frequency of 1kHz.
Input Impedance vs. Clock Frequencies
The MAX7426/MAX7427’s 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 f
CLK
= clock frequency and C
IN
= 1pF.
Low-Power Shutdown Mode
The MAX7426/MAX7427 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 where offset adjust-
ment is required, apply an external bias voltage
through a resistor-divider network to OS, as shown in
Figure 3. 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:
V
V
V
COM
=
2
where (V
IN
- V
COM
) is lowpass filtered by the SCF and
OS is added at the output stage. See the
Electrical
V
V
V
typical
(
OUT
IN
COM
OS
DD
(
)
)
=
+
Z
1
×
f
C
CLK
IN
=
f
(kHz)
17.5
C
10
(pF)
OSC
3
OSC
=
×
f
f
100
C
CLK
=
PASSBAND
STOPBAND
G
FREQUENCY
f
C
f
S
f
S
f
C
f
S
f
C
TRANSITION RATIO =
RIPPLE
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
MAX7426
MAX7427
Figure 2. Elliptic Filter Response
Figure 3. Offset Adjustment Circuit
相關(guān)PDF資料
PDF描述
MAX7426EPA Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125
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MAX7427EPA Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125
MAX7426EUA 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
MAX7427CUA SWTCH ROLLER DPDT 10A SCRW TERM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX7426CUA+ 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
MAX7426CUA+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
MAX7426CUA-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
MAX7426EPA 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
MAX7426EPA+ 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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