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| 型号： | MAX271CWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 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： | 连续时间低通 |
| 频率 - 截止或中心： | 25kHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 2nd |
| 电源电压： | 4.74 V ~ 16 V，±2.37 V ~ 8 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 |
12
Maxim Integrated
Digitally-Programmed, Dual
2nd-Order Continuous Lowpass Filter
MAX270/MAX271
Digital Threshold Levels
All digital inputs are TTL and CMOS compatible, unless
otherwise stated. Inputs are CMOS gates with less than
1A leakage current and 8pF capacitance loading.
Typical logic voltage thresholds are a function of the V+
supply voltage as shown below (voltages are referenced
to GND).
Filter Performance
All MAX270/MAX271 internal amplifier and output stages
for filter sections. uncommitted op amp, and T/H are
identical. The outputs are designed to drive 5kω in paral-
lel with a maximum capacitance of 100pF. At higher load
levels, the output swing becomes asymmetric. All outputs
can be short circuited to GND for an indefinite duration.
The MAX270/MAX271 operating frequency range is
limited to approximately 2MHz by the bandwidth of the
internal amplifiers.
Filter Noise
Wideband filter noise over a 50kHz bandwidth is
12VRMS and 38VRMS per section for fC programmed
to 1kHz and 25kHz, respectively. A dynamic range of
over 96dB results.
Filter Input Impedance
At DC, the input impedance at INA and INB is equal to
the DC input impedance of the amplifier, which is about
5Mω. At higher frequencies, internal capacitors contrib-
ute to an effective input impedance that may fall as low
as 100kω at 25kHz.
MAX271 Track-and-Hold
The MAX271 T/H is functionally equivalent to a switched
200pF capacitor buffered by a unity-gain amplifier (Figures
1b and 1c). When the T/H pin is driven low, the output of
filter A or filter B (whichever is selected via control inter-
face) internally connects to the amplifier, and T/H OUT
follows the filter output. The offset at T/H OUT (±6mV max)
is the combined offset of the filter amplifier and the T/H
buffer. When T/H is pulled high, the switch disconnects
the filter signal from the T/H. The T/H capacitor holds the
stored charge, and that voltage is buffered at T/H OUT.
A low level at T/H EN disconnects T/H OUT, enabling mul-
tiplexed operation (Figure 3). T/H A/B selects between
OUTA and OUTB as the T/H input. In FP mode, the T/H
EN and T/H OUT functions are controlled by writing con-
trol bits to program memory, with T/H EN and T/H OUT
pins disabled.
See the Typical Operating Characteristics graphs for T/H
dynamic accuracy.
Note: For +5V single-supply operation, where incoming logic
signals are referenced to V-, typical logic thresholds are +3.5V.
Therefore, a CMOS (rail-to-rail) logic interface is recommended.
Figure 3. MAX271 Multiplexed Operation
AY0
T/H OUT
T/H EN
CH1
Y1
INA
Y2
Y7
B
C
CHANNEL
SELECT
74HC238
T/H OUT
T/H EN
CH3
INA
T/H OUT
T/H EN
CH2
INA
OUTPUT
V+ (V)
LOGIC THRESHOLD
VOLTAGE (V)
8
+2.4
7
+2.3
6
+2.0
5
+1.75
4
+1.5
2.5
+1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX271CWG+ | 功能描述:有源滤波器 Digitally Prog Dual 2-ORD Cont Lowpass 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 |
| MAX271CWG+T | 功能描述:有源滤波器 Digitally Prog Dual 2-ORD Cont Lowpass 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 |
| MAX271CWG-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 |
| MAX271ENG | 功能描述:有源滤波器 Integrated Circuits (ICs) 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 |
| MAX271ENG+ | 功能描述:有源滤波器 Digitally Prog Dual 2-ORD Cont Lowpass 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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