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参数资料
| 型号： | MAX262BEWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/26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： | 140kHz |
| 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
20
______________________________________________________________________________________
can also perform this last step. The desired f0s and Qs
are stated, and the appropriate digital coefficients are
supplied.
Cascading Filters
In some designs, such as very narrow band filters, sev-
eral second-order sections with identical center fre-
quency can be cascaded. The total Q of the resultant
filter is:
Q is the Q of each individual filter section, and N is the
number of sections. In Table 6, the total Q and band-
width are listed for up to five identical second-order
sections. B is the bandwidth of each section.
In high-order bandpass filters, stages with different f0s
and Qs are also often cascaded. When this happens,
the overall filter gain at the bandpass center frequency
is not simply the product of the individual gains
because f0, the frequency where each sections gain is
specified, is different for each second-order section.
The gain of each section at the cascaded filter's center
frequency must be determined to obtain the total gain.
For all-pole filters the gain, H(f0), as each second-order
section's f0 is divided by an adjustment factor, G, to
obtain that section's gain, H(f0BP), at the overall center
frequency:
H1(f0BP) = H(f01) / G1 = Section 1’s Gain at f0BP
where F1 = f01 / fOBP
G1, Q1, and f01 are the gain adjustment factor, Q, and
f0 for the first of the cascaded second-order sections.
The gain of the other sections (2, 3, etc.) at f0BP is
determined the same way. The overall gain is:
H(f0Bp) = H1(f0BP) x H2(f0BP) x etc.
For cascaded filters with zeros (fZ) such as elliptics, the
gain adjustment factor for each stage is:
where F1Z = fz1 / f0BP, and F1 is the same as above.
Application Hints
Power Supplies
The MAX260/MAX261/MAX262 can be operated with a
variety of power supply configurations, including +5V to
+12V single supply or ±2.5V to ±5V dual supplies.
When a single supply is used, V- is connected to sys-
tem ground and the filter's GND pin should be biased
at V+/2. The input signal is then either capacitively cou-
pled to the filter input or biased to V+/2. Figure 16
shows circuit connections for single-supply operation.
When power supplies other than ±5V are used, CMOS
input logic levels (HIGH = V+, LOW = GND or V-) are
required for WR, D0, D1, A0–A3, OLKA, and CLKB.
With ±5V supplies, either TTL or CMOS levels can be
used. Note, however, that power consumption at ±5V is
reduced if CLKA and CLKB are driven with ±5V, rather
than TTL or 0 to 5V levels. Operation with +5V or ±2.5V
power lowers power consumption, but also reduces
bandwidth by approximately 25% compared to +12V or
±5V supplies.
Best performance is achieved if V+ and V- are bypassed
to ground with 4.7F electrolytic (Tantalum is preferred.)
and 0.1F ceramic capacitors. These should be located
as close to the supply pins as possible. The lead length
of the bypass capacitors should be shortest at the V+
and V- pins. When using a single supply, V+ and GND
should be bypassed to V- as shown in Figure 16.
Output Swing and Clipping
MAX260/MAX261/MAX262 outputs are designed to
drive 10k
loads. For the MAX261 and MAX262, all fil-
ter outputs swing to within 0.15V of each supply rail
with a 10k
load. In the MAX260 only, an internal sam-
ple-hold circuit reduces voltage swing at the N/HP/AP
output compared to LP and BR. N/HP/AP, therefore,
swings to within 1V (10k
load) of either rail on the
MAX260.
To ensure that the outputs are not driven beyond their
maximum range (output clipping), the peak amplitude
response, individual section gains (HOBP, HOLP,
HOHP), input signal level, and filter offset voltages must
be carefully considered. It is especially important to
check unused outputs for clipping (i.e., the lowpass
output in a bandpass hookup), because overload at
any filter stage severely distorts the overall response.
The maximum signal swing with ±4.75V supplies and a
1.0V filter offset is approximately ±3.5V.
For example, lets assume a fourth-order lowpass filter is
being implemented with a Q of 2 using mode 1. With a
single 5V supply (i.e., ±2.5V with respect to chip GND)
the maximum output signal is ±2V (w.r.t. GND). Since in
G
QF
F
Q
FF
Z
1
11
2
1
2
1
2
11
2 12
1
2
1
2
1
(
)
(
/
)
/
=
+
G
QF
F
Q
F
1
11
2
11
2 12
1
(
)
(
/
)
/
=
+
Total Q
Q
T
N
/
=
()
21
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX262BEWG+ | 功能描述:有源滤波器 MPU Programmable Universal 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 |
| MAX262BEWG+T | 功能描述:有源滤波器 MPU Programmable Universal 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 |
| MAX262BEWG-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 |
| MAX262BMRG | 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 |
| MAX2630EUS | 制造商:Maxim Integrated Products 功能描述:VHF-TO-MICROWAVE +3V GERNERAL-PUR - Rail/Tube |
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