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| 型号： | MAX7427CUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 5TH 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 滤波器类型： | 椭圆，低通开关电容器 |
| 频率 - 截止或中心： | 12kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 5th |
| 电源电压： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
MAX7426/MAX7427
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
8
_______________________________________________________________________________________
Detailed Description
The MAX7426/MAX7427 family of 5th-order, elliptic,
lowpass filters provides sharp rolloff with good stop-
band rejection. All parts operate with a 100:1 clock-to-
corner frequency ratio.
Most SCFs are designed with biquadratic sections.
Each section implements two pole-zero pairs, and the
sections can be cascaded to produce higher-order fil-
ters. The advantage to this approach is ease of design.
However, this type of design is highly sensitive to com-
ponent variations if any section’s Q is high. The
MAX7426/MAX7427 use an alternative approach, which
is to emulate a passive network using switched-capaci-
tor integrators with summing and scaling. The passive
network may be synthesized using CAD programs or
may be found in many filter books. Figure 1 shows a
basic 5th-order ladder elliptic filter structure.
A switched-capacitor filter that emulates a passive lad-
der filter retains many of the same advantages. The
component sensitivity of a passive ladder filter is low
when compared to a cascaded biquadratic design,
because each component affects the entire filter shape
rather than a single pole-zero pair. In other words, a
mismatched component in a biquadratic design has a
concentrated error on its respective poles, while the
same mismatch in a ladder filter design spreads its
error over all poles.
Elliptic Characteristics
Lowpass elliptic filters such as the MAX7426/MAX7427
provide the steepest possible rolloff with frequency of
the four most common filter types (Butterworth, Bessel,
Chebyshev, and elliptic). The high Q value of the poles
near the passband edge combined with the stopband
zeros allow for the sharp attenuation characteristic of
elliptic filters, making these devices ideal for anti-alias-
ing and post-DAC filtering in single-supply systems
(see the Anti-Aliasing and Post-DAC Filtering section).
In the frequency domain (Figure 2), the first transmis-
sion zero causes the filter’s amplitude to drop to a mini-
mum level. Beyond this zero, the response rises as the
frequency increases until the next transmission zero.
The stopband begins at the stopband frequency, fS. At
frequencies above fS, the filter’s gain does not exceed
the gain at fS. The corner frequency, fC, is defined as
the point where the filter output attenuation falls just
below the passband ripple. The transition ratio (r) is
defined as the ratio of the stopband frequency to the
corner frequency:
r = fS / fC
The MAX7426/MAX7427 have a transition ratio of 1.25
and typically 37dB of stopband rejection.
Clock Signal
External Clock
These SCFs are designed for use with external clocks
that have a 40% to 60% duty cycle. When using an
external clock, drive the CLK pin with a CMOS gate
C4
C2
L4
C5
C3
C1
VIN
+
-
RL
L2
RS
Figure 1. 5th-Order Ladder Elliptic Filter Network
NAME
FUNCTION
1
COM
Common Input Pin. Biased internally at midsupply. Bypass externally to GND with a 0.1F capacitor. To
override internal biasing, drive with an external supply.
2
IN
Filter Input
PIN
3
GND
Ground
4
VDD
Positive Supply Input, +5V for MAX7426 or +3V for MAX7427
8
CLK
Clock Input. Connect an external capacitor (COSC) from CLK to GND to set the internal oscillator
frequency. To override the internal oscillator, connect to an external clock.
7
SHDN
Shutdown Input. Drive low to enable shutdown mode; drive high or connect to VDD for normal operation.
6
OS
Offset Adjust Input. To adjust output offset, bias OS with a resistive voltage-divider between an external
supply and ground. Connect OS to COM if no offset adjustment is needed.
5
OUT
Filter Output
Pin Description
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7427EPA | 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 |
| MAX7427EPA+ | 功能描述:有源滤波器 5th-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 |
| MAX7427EUA | 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 |
| MAX7427EUA+ | 功能描述:有源滤波器 5th-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 |
| MAX7427EUA+T | 功能描述:有源滤波器 5th-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 |
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