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参数资料
| 型号： | MAX292ESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 滤波器类型： | 贝塞尔，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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
error on its respective poles, while the same mismatch in a
ladder filter design will spread its error over all poles.
The MAX291/MAX292/MAX295/MAX296 input impedance
is effectively that of a switched-capacitor resistor (see
equation below, and Table 1), and it is inversely proportion-
al to frequency. The input impedance values determined
below represent average input impedance, since the input
current is not continuous. The input current flows in a series
of pulses that charge the input capacitor every time the
appropriate switch is closed. A good rule of thumb is that
the driver’s input source resistance should be less than
10% of the filter’s input impedance. The input impedance
of the filter can be estimated using the following formula:
Z = 1 / (fCLK * C)
where: fCLK = Clock Frequency
The input impedance for various clock frequencies is
given below:
Clock-Signal Requirements
The MAX291/MAX292/MAX295/MAX296 maximum rec-
ommended clock frequency is 2.5MHz, producing a cutoff
frequency of 25kHz for the MAX291/MAX292 and 50kHz
for the MAX295/MAX296. The CLK pin can be driven by
an external clock or by the internal oscillator with an exter-
nal capacitor. For external clock applications, the clock
circuitry has been designed to interface with +5V CMOS
logic. Drive the CLK pin with a CMOS gate powered from
0V and +5V when using either a single +5V supply or dual
+5V supplies. The MAX291/MAX292/MAX295/MAX296
supply current increases slightly (<3%) with increasing
clock frequency over the clock range 100kHz to 1MHz.
Varying the rate of an external clock will dynamically ad-
just the corner frequency of the filter.
Ideally, the MAX291/MAX292/MAX295/MAX296 should
be clocked symmetrically (50% duty cycle). MAX291/
MAX292/MAX295/MAX296 can be operated with clock
asymmetry of up to 60/40% (or 40/60%) if the clock
remains HIGH and LOW for at least 200ns. For example,
if the part has a maximum clock rate of 2.5MHz, then the
clock should be high for at least 200ns, and low for at
least 200ns.
When using the internal oscillator, the capacitance (COSC)
from CLK to ground determines the oscillator frequency:
The stray capacitance at CLK should be minimized be-
cause it will affect the internal oscillator frequency.
___________Application Information
Power Supplies
The MAX291/MAX292/MAX295/MAX296 operate from
either dual or single power supplies. The dual-supply volt-
age range is +2.375V to +5.500V. The ±2.5V dual supply is
equivalent to single-supply operation (Figure 3). Minor per-
formance degradation could occur due to the external
resistor divider network, where the GND pin is biased to
mid-supply.
Input Signal Range
The ideal input signal range is determined by observing at
what voltage level the total harmonic distortion plus noise
(THD + Noise) ratio is maximized for a given corner fre-
quency. The
Typical Operating Characteristics show the
MAX291/MAX292/MAX295/MAX296 THD + Noise response
as the input signal’s peak-to-peak amplitude is varied.
Uncommitted Op Amp
The uncommitted op amp has its noninverting input tied
to the GND pin, and can be used to build a 1st- or 2nd-
f
kHz
CpF
OSC
()
≈
10
3
5
8th-Order, Lowpass,
Switched-Capacitor Filters
C2
R1
L1
L3
L5
L7
VIN
C4
C6
C8
R2
VO
Figure 2. 8th-Order Ladder Filter Network
MAX29_
CLK
1
+1V TO +4V
INPUT SIGNAL
RANGE
5
+5V
OUTPUT
0V
6
3
4
+5V
0V
8
OUT
GND
V-
V+
7
2
OP OUT
OP IN-
IN
0.1
F
10k
0.1
F
Figure 3. +5V Single-Supply Operation
Table 1. Input Impedance for Various Clock
Frequencies
1000kHz
(k)
446
305
224
237
100kHz
(M)
4.46
3.05
2.24
2.37
10kHz
(M)
44.6
30.5
22.4
23.7
C (pF)
MAX291
2.24
MAX292
3.28
PART
MAX295
4.47
MAX296
4.22
Pin Configuration is 8-pin DIP.
MAX291/MAX292/MAX295/MAX296
Maxim Integrated
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX292ESA+ | 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 |
| MAX292ESA+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 |
| MAX292ESA-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 |
| MAX292EWE | 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 |
| MAX292EWE/GG8 | 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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