参数资料
型号: LMV821M5X/NOPB
厂商: National Semiconductor
文件页数: 13/38页
文件大小: 0K
描述: IC OPAMP RRO 5MHZ SOT23-5
标准包装: 3,000
放大器类型: 通用
电路数: 1
输出类型: 满摆幅
转换速率: 2 V/µs
增益带宽积: 5.6MHz
电流 - 输入偏压: 100nA
电压 - 输入偏移: 3500µV
电流 - 电源: 300µA
电流 - 输出 / 通道: 45mA
电压 - 电源,单路/双路(±): 2.5 V ~ 5.5 V,±1.25 V ~ 2.75 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-23-5
包装: 带卷 (TR)
其它名称: *LMV821M5X
*LMV821M5X/NOPB
LMV821M5X
LMV821M5X-ND
LMV821M5X/NOPBTR
SNOS032G – AUGUST 1999 – REVISED NOVEMBER 2013
Butterworth Response as Measured by the HP3577A Network Analyzer
Figure 43. 300 kHz, Low-Pass Filter
In addition to performance, DAAFs are relatively easy to design and implement. The design equations for the
low-pass and high-pass DAAFs are shown below. The first two equation calculate the Fc and the circuit Quality
Factor (Q) for the LPF (Figure 41). The second two equations calculate the Fc and Q for the HPF (Figure 42).
(2)
To simplify the design process, certain components are set equal to each other. Refer to Figure 41 and
Figure 42. These equal component values help to simplify the design equations as follows:
(3)
To illustrate the design process/implementation, a 3 kHz, Butterworth response, low-pass filter DAAF (Figure 41)
is designed as follows:
1. Choose C1 = C3 = C = 1 nF
2. Choose R4 = R5 = 1 k
3. Calculate Ra and R2 for the desired Fc as follows:
(4)
4. Calculate R3 for the desired Q. The desired Q for a Butterworth (Maximally Flat) response is 0.707 (45
degrees into the s-plane). R3 calculates as follows:
20
Copyright 1999–2013, Texas Instruments Incorporated
相关PDF资料
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