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| 型号： | MAX260BEWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC FILTER ACT MPU PROG 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 滤波器类型： | 通用开关电容器 |
| 频率 - 截止或中心： | 7.5kHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 2nd |
| 电源电压： | 4.74 V ~ 12.6 V，±2.37 V ~ 6.3 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
MAX260/MAX261/MAX262
Microprocessor Programmable
Universal Active Filters
22
______________________________________________________________________________________
errors are predictable, the graphs can be used to cor-
rect the selected f0 and Q so that the actual realized
parameters are on target. These predicted errors are
not unique to MAX260 series devices and, in fact,
occur with all types of sampled filters. Consequently,
these corrections can be applied to other switched
capacitor filters. In the majority of cases, the errors are
not significant, i.e., less than 1%, and correction is not
needed. However, the MAX262 does employ a lower
range of fCLK/f0 ratios than the MAX260 or MAX261 and
is more prone to sampling errors, as the tables show.
Maxim's filter design software applies the previous cor-
rections automatically as a function of desired fCLK/f0,
and Q. Therefore, Figure 20 should not be used when
Maxim's software determines f0 and Q. This results in
overcompensation of the sampling errors since the cor-
rection factors are then counted twice.
The data plotted in Figure 20 applies for modes 1 and
3. When using Figure 20 for mode 4, the f0 error
obtained from the graph should be multiplied by 1.5
and the Q error should be multiplied by 3.0. In mode 2,
the value of fCLK/f0 should be multiplied by
√2 and the
programmed Q should be divided by
√2 before using
the graphs.
As with all sampled systems, frequency components of
the input signal above one half the sampling rate are
aliased. In particular, input signal components near the
sampling rate generate difference frequencies that
often fall within the passband of the filter. Such aliased
signals, when they appear at the output, are indistin-
guishable from real input information. For example, the
aliased output signal generated when a 99kHz wave-
form is applied to a filter sampling at 100kHz (fCLK =
200kHz) is 1kHz. This waveform is an attenuated ver-
sion of the output that would result from a true 1kHz
input. Remember that, with the MAX260 series filters,
the nyquist rate (one half the sample rate) is in fact
fCLK/4, because fCLK is internally divided by two.
A simple, passive RC lowpass input filter is usually suf-
ficient to remove input frequencies that can cause
aliasing. In many cases, the input signal itself may be
band limited and require no special anti-alias filtering.
The wideband MAX262 uses lower fCLK/f0 ratios than
the MAX260/MAX261 and, for this reason, is more likely
to require input filtering than the MAX260 or MAX281.
Trimming DC Offset
The DC offset voltage at the LP or notch output can be
adjusted with the circuit in Figure 21. This circuit also
uses the input op amp to implement a single-pole anti-
alias filter. Note that the total offset is generally less in
multistage filters than when only one section is used,
MAX261
INA
BPA
TRACE A
500kHz TTL
TRACE B
OV
A 1V/DIV
B 5mV/DIV
C mV/DIV
1
s/div
TRACE C
C, 1000pF
R, 10k
CLKA
Figure 17. MAX261 Bandpass Output Clock Noise
VIN
CFB
CIN
12pF
~5pF
+
-
fCLK
2
CIN fCLK
RIN =
Figure 18. MAX260 Input Model
VIN
CFB
CA 12pF
CB
0.016pF
~5pF
+
-
fCLK
2
750 CA fCLK
RIN =
Figure 19. MAX261/MAX262 Input Model
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX260BEWG+ | 功能描述:有源滤波器 MPU Programmable Univ Active 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 |
| MAX260BEWG+T | 功能描述:有源滤波器 MPU Programmable Univ Active 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 |
| MAX260BEWG-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 |
| MAX260BMRG | 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 |
| MAX260SOFT | 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 |
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