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參數(shù)資料
| 型號(hào)： | MAX7405EPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 8th-Order, Lowpass, Bessel, Switched-Capacitor Filters |
| 中文描述： | SWITCHED CAPACITOR FILTER, BESSEL, LOWPASS, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001AB, DIP-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 197K |
| 代理商： | MAX7405EPA |
M
8th-Order, Lowpass, Bessel,
S witc hed-Capac itor Filters
_______________________________________________________________________________________
7
NAME
FUNCTION
1
COM
Common Input. Biased internally at mid-supply. Bypass externally to GND with a 0.1μF capacitor. To over-
ride internal biasing, drive with an external supply.
2
IN
Filter Input
PIN
3
GND
Ground
4
V
DD
OUT
Positive Supply Input: +5V for MAX7401, +3V for MAX7405
8
CLK
Clock Input. To override the internal oscillator, connect to an external clock; otherwise, connect an external
capacitor (C
OSC
) from CLK to GND to set the internal oscillator frequency.
7
SHDN
Shutdown Input. Drive low to enable shutdown mode; drive high or connect to V
DD
for normal operation.
6
OS
Offset Adjust Input. To adjust output offset, bias OS externally. Connect OS to COM if no offset adjustment is
needed. Refer to
Offset and Common-Mode Input Adjustment section.
5
Filter Output
Pin Desc ription
_______________Detailed Desc ription
The MAX7401/MAX7405 Bessel filters provide low over-
shoot and fast settling responses. Both parts operate
with a 100:1 clock-to-corner frequency ratio and a 5kHz
maximum corner frequency.
Lowpass Bessel filters such as the MAX7401/MAX7405
delay all frequency components equally, preserving the
shape of step inputs (subject to the attenuation of the
higher frequencies). Bessel filters settle quickly—an
important characteristic in applications that use a multi-
plexer (mux) to select an input signal for an analog-to-
digital converter (ADC). An anti-aliasing filter placed
between the mux and the ADC must settle quickly after
a new channel is selected.
Figure 1 shows the difference between Bessel and
Butterworth filters when a 1kHz square wave is applied
to the filter input. With the filter cutoff frequencies set at
5kHz, trace B shows the Bessel filter response and
trace C shows the Butterworth filter response.
Bac kground Information
Most switched-capacitor filters (SCFs) are designed with
biquadratic sections. Each section implements two filter-
ing poles, and the sections are cascaded to produce
higher order filters. The advantage to this approach is
ease of design. However, this type of design is highly
sensitive to component variations if any section’s Q is
high. An alternative approach is to emulate a passive net-
work using switched-capacitor integrators with summing
and scaling. Figure 2 shows a basic 8th-order ladder filter
structure.
A
2V/div
2V/div
2V/div
C
A: 1kHz INPUT SIGNAL
B: BESSEL FILTER RESPONSE; f
C
= 5kHz
C: BUTTERWORTH FILTER RESPONSE; f
C
= 5kHz
B
200
μ
s/div
Figure 1. Bessel vs. Butterworth Filter Response
L3
L5
L7
C8
R2
C4
C2
V
IN
+
-
V
0
L1
R1
C6
Figure 2. 8th-Order Ladder Filter Network
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7405EPA+ | 功能描述:有源濾波器 8th-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 |
| MAX7405ESA | 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 |
| MAX7405ESA+ | 功能描述:有源濾波器 8th-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 |
| MAX7405ESA+T | 功能描述:有源濾波器 8th-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 |
| MAX7405ESA-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 |
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