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SGM8054 Datasheet(PDF) 11 Page - SG Micro Corp |
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SGM8054 Datasheet(HTML) 11 Page - SG Micro Corp |
11 / 20 page 250MHz, Rail-to-Rail Output CMOS Operational Amplifiers 11 SG Micro Corp www.sg-micro.com SGM8051/2/3/4/5 TYPICAL APPLICATION CIRCUITS Differential Amplifier The circuit shown in Figure 3 performs the difference function. If the resistors ratios are equal (R4/R3 = R2/R1), then VOUT = (Vp - Vn) × R2/R1 + VREF. Vn Vp VOUT SGM8051 VREF R1 R2 R3 R4 Figure 3. Differential Amplifier Low Pass Active Filter The low pass filter shown in Figure 4 has a DC gain of (-R2/R1) and the -3dB corner frequency is 1/2 R2C. Make sure the filter bandwidth is within the bandwidth of the amplifier. The large values of feedback resistors can couple with parasitic capacitance and cause undesired effects such as ringing or oscillation in high-speed amplifiers. Keep resistor values as low as possible and consistent with output loading consideration. VIN VOUT SGM8051 R1 R2 R3 = R1//R2 C Figure 4. Low Pass Active Filter Driving Video The SGM805x can be used in video applications like in Figure 5. VIN SGM8051 RG RF 75Ω 75Ω CABLE VOUT 75Ω G = 1 + RF / RG Figure 5. Typical Video Driving |
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