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| 型号： | MAX291CWE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 滤波器类型： | 巴特沃斯，低通开关电容器 |
| 频率 - 截止或中心： | 25kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 8th |
| 电源电压： | 4.75 V ~ 11 V，±2.375 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 1422 (CN2011-ZH PDF) |
_______________Detailed Description
Lowpass Butterworth filters such as the MAX291/
MAX295 provide maximally flat passband response, making
them ideal for instrumentation applications that require mini-
mum deviation from the DC gain throughout the passband.
Lowpass Bessel filters such as the MAX292/MAX296
delay all frequency components equally, preserving the
shape of step inputs, subject to the attenuation of the high-
er frequencies. They also settle faster than Butterworth fil-
ters. Faster settling can be important in applications that
use a multiplexer (mux) to select one signal to be sent to
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 by the mux.
The difference in the filters’ responses can be observed
when a 3kHz square wave is applied to the filter input
(Figure 1, trace A). With the filter cutoff frequencies set at
10kHz, trace C shows the MAX291/MAX295 Butterworth
filter response and trace B shows the MAX292/MAX296
Bessel filter response. Since the MAX292/MAX296 have a
linear phase response in the passband, all frequency
components are delayed equally, which preserves the
square wave. The filters attenuate higher frequencies of
the input square wave, giving rise to the rounded edges at
the output. The MAX291/MAX295 delay different frequen-
cy components by varying times, causing the overshoot
and ringing shown in trace C.
The MAX291/MAX295 give more attenuation outside the
passband. The phase and frequency response curves in
the
Typical Operating Characteristics reveal the differences
between the two types of filters.
MAX291/MAX292/MAX295/MAX296 phase shift and gain
do not vary significantly from part to part. Typical phase
shift and gain differences are less than 0.5% at the corner
frequency (FC).
Corner Frequency and Filter Attenuation
The MAX291/MAX292 operate with a 100:1 clock to corner
frequency ratio and a 25kHz maximum corner frequency,
where corner frequency is defined as the point where the
filter output is 3dB below the filter’s DC gain. The
MAX295/MAX296 operate with a 50:1 clock to corner fre-
quency ratio with a 50kHz maximum corner frequency.
The 8 poles provide 48dB of attenuation per octave.
Background Information
Most switched-capacitor filters are designed with biqua-
dratic sections. Each section implements two filtering
poles, and the sections can be cascaded to produce high-
er-order filters. The advantage to this approach is ease of
design. However, this type of design can display poor sen-
sitivity if any section’s Q is high.
An alternative approach is to emulate a passive network
using switched-capacitor integrators with summing and
scaling. The passive network can be synthesized using
CAD programs, or can be found in many filter books.
Figure 2 shows the basic ladder filter structure.
A switched-capacitor filter that emulates a passive ladder
filter retains many of its advantages. The filter’s com-
ponent sensitivity is low when compared to a cascaded
biquad design because each component affects the entire
filter shape, not just one pole pair. That is, a mismatched
component in a biquad design will have a concentrated
8th-Order, Lowpass,
Switched-Capacitor Filters
_____________________Pin Description
Filter Input
14
8
Inverting Input to the uncommit-
ted op amp. The noninverting op
amp is internally tied to ground.
6
4
Filter Output
11
5
Ground. In single-supply oper-
ation, GND must be biased to
the mid-supply voltage level.
12
6
Positive Supply pin. Dual sup-
plies: +2.375V to +5.500V. Single
supplies: +4.75V to +11.0V.
13
7
Uncommitted Op-Amp Output
5
3
Negative Supply pin. Dual
supplies: -2.375V to -5.500V.
Single supplies: V- = 0V.
4
2
8-PIN
Clock Input. Use internal or
external clock.
3
1
No Connect
1, 2, 7,
8, 9, 10,
15, 16
FUNCTION
16-PIN
IN
OP IN-
OUT
GND
V+
OP OUT
V-
CLK
N.C.
NAME
A
B
AMPLITUDE
(5V/div)
C
A: 3kHz INPUT SIGNAL
B: MAX292 BESSEL FILTER RESPONSE WITH Fo = 10kHz
C: MAX291 BUTTERWORTH FILTER RESPONSE WITH Fo = 10kHz
TIME (200
s/div)
Figure 1. Bessel vs. Butterworth Filter Responses
MAX291/MAX292/MAX295/MAX296
6
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| MAX296CWE+ | IC FILTER LOWPASS 16-SOIC |
| MAX296CPA+ | IC FILTER LOWPASS 8-DIP |
| MAX296CSA+ | IC FILTER LOWPASS 8-SOIC |
| MAX7419EUA+ | IC FILTER LOWPASS 5TH 8UMAX |
| MAX7422EUA+ | IC FILTER LOWPASS 5TH 8UMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX291CWE+ | 功能描述:有源滤波器 8th-Order Lowpass Switched-Cap 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 |
| MAX291CWE+T | 功能描述:有源滤波器 8th-Order Lowpass Switched-Cap 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 |
| MAX291CWE-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 |
| MAX291EPA | 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 |
| MAX291EPA+ | 功能描述:有源滤波器 8th-Order Lowpass Switched-Cap 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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