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SGM8652XS Datasheet(PDF) 9 Page - SG Micro Corp |
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SGM8652XS Datasheet(HTML) 9 Page - SG Micro Corp |
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9 / 17 page  SGM8651/2/3/4/5 ９ Typical Application Circuits Differential Amplifier The circuit shown in Figure 4 performs the difference function. If the resistors ratios are equal ( R4 / R3 = R2 / R1 ), then VOUT = ( Vp – Vn ) × R2 / R1 + Vref. Vn Vp VOUT SGM8651 Vref R1 R2 R3 R4 Figure 4. Differential Amplifier Instrumentation Amplifier The circuit in Figure 5 performs the same function as that in Figure 4 but with the high input impedance. Vn Vp SGM8651 Vref R1 R2 R3 R4 VOUT SGM8651 SGM8651 Figure 5. Instrumentation Amplifier Low Pass Active Filter The low pass filter shown in Figure 6 has a DC gain of (-R2/R1) and the –3dB corner frequency is 1/2 πR2C. Make sure the filter 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 resistors value as low as possible and consistent with output loading consideration. VIN VOUT SGM8651 R1 R2 R3 = R1 // R2 C Figure 6. Low Pass Active Filter Driving Video The SGM865x can be used in video applications like in Figure 7. VIN SGM8651 RG RF 75 Ω 75 Ω CABLE VOUT 75 Ω G = 1 + RF / RG Figure 7. Typical Video Driving |
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