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LT1567 Datasheet(PDF) 9 Page - Linear Technology |
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LT1567 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT1567 9 1567fa The simple-to-use spreadsheet requires the user to de- fine the desired corner (or center) frequency, the pass- band gain and a capacitor value for a choice of second or third order Chebyshev or Butterworth lowpass or second order bandpass filters. The spreadsheet outputs the required external standard component values and provides a circuit diagram. Signal Ground Both operational amplifiers within the LT1567 are de- signed for inverting operation (constant common mode APPLICATIO S I FOR ATIO input) and they share a single reference node on the chip. Two pins permit access to this node: DC BIAS and BYPASS. For a clean reference over a wide bandwidth, the normal procedure is to connect DC BIAS to a DC potential or ground and BYPASS to a decoupling capacitor that returns to a ground plane. Differential Output Feature The multiple feedback filter section of Figure 1 inherently includes two outputs of opposite signal polarity: a DC inverting output from the OA (Pin 1) and a DC noninverting DESIGN EQUATIONS FOR fCENTER ≤ 1MHz fCENTER IS THE FILTER’S CENTER FREQUENCY fCENTER = √GN + 1 2 • π • R2 • C1 MAXIMUM fCENTER = 5MHz/GAIN GN IS GAIN AT fCENTER = R3/R1, R2 = R3, C1 = C2 C1 ≤ √ GN + 1 2500 • fC R3 = √GN + 1 2 π • C1 • fCENTER –3dB BANDWIDTH = fCENTER √GN + 1 – + 7 VOUT + VOUT – 6 600 Ω 600 Ω 2 1 C1 3 5 8 VIN LT1567 0.1 µF 7pF C2 R3 150 Ω V+ V+ R1 R2 0.1 µF 4 V– V– 0.1 µF 1567 F02a FREQUENCY (Hz) 50k –15 –5 5 25 500k 5M 1567 F02b 15 –10 0 20 10 GAIN IS MEASURED TO EITHER OUTPUT ALONE. IF OUTPUT USED DIFFERENTIALLY, VOUT + – V OUT – = 2× VIN Figure 2. 2nd Order Bandpass Filter and Gain Response for fC = 500kHz, Gain = 10 (C1 = C2 = 1000pF, R2 = R3 = 1.05k, R1 = 105 Ω) Gain vs Frequency |
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