參數資料
型號: LMV822MX/NOPB
廠商: National Semiconductor
文件頁數: 13/38頁
文件大小: 0K
描述: IC OP AMP RAIL/RAIL 8-SOIC
標準包裝: 1
放大器類型: 通用
電路數: 2
輸出類型: 滿擺幅
轉換速率: 2 V/µs
增益帶寬積: 5.6MHz
電流 - 輸入偏壓: 100nA
電壓 - 輸入偏移: 3500µV
電流 - 電源: 500µA
電流 - 輸出 / 通道: 45mA
電壓 - 電源,單路/雙路(±): 2.5 V ~ 5.5 V,±1.25 V ~ 2.75 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 8-SOIC
包裝: 標準包裝
產品目錄頁面: 1269 (CN2011-ZH PDF)
其它名稱: LMV822MXDKR
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
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