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TPA6205A1DRBT датащи(PDF) 9 Page - Texas Instruments |
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TPA6205A1DRBT датащи(HTML) 9 Page - Texas Instruments |
9 / 26 page www.ti.com APPLICATION INFORMATION Advantages of Fully Differential Amplifiers APPLICATION SCHEMATICS _ + VDD VO+ VO- GND ToBattery Cs Bias Circuitry IN- IN+ + - InFrom DAC SHUTDOWN RI RI C( ) BYPASS (Optional) RF RF TPA6205A1 SLOS490A – JULY 2006 – REVISED AUGUST 2006 • Mid-supply bypass capacitor, C(BYPASS), not required: The fully differential amplifier does not FULLY DIFFERENTIAL AMPLIFIER require a bypass capacitor. This is because any The TPA6205A1 is a fully differential amplifier with shift in the mid-supply affects both positive and differential inputs and outputs. The fully differential negative channels equally and cancels at the amplifier consists of a differential amplifier and a differential output. However, removing the common- mode amplifier. The differential amplifier bypass capacitor slightly worsens power supply ensures that the amplifier outputs a differential rejection ratio (kSVR), but a slight decrease of voltage that is equal to the differential input times the kSVR may be acceptable when an additional gain. The common-mode feedback ensures that the component can be eliminated (see Figure 17). common-mode voltage at the output is biased • Better RF-immunity: GSM handsets save power around VDD/2 regardless of the common- mode by turning on and shutting off the RF transmitter voltage at the input. at a rate of 217 Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier cancels the signal much • Input coupling capacitors not required: A fully better than the typical audio amplifier. differential amplifier with good CMRR, like the TPA6205A1, allows the inputs to be biased at voltage other than mid-supply. For example, if a Figure 27 through Figure 31 show application DAC has mid-supply lower than the mid-supply schematics for differential and single-ended inputs. of the TPA6205A1, the common-mode feedback Typical values are shown in Table 1. circuit adjusts for that, and the TPA6205A1 outputs are still biased at mid-supply of the Table 1. Typical Component Values TPA6205A1. The inputs of the TPA6205A1 can be biased from 0.5 V to VDD - 0.8 V. If the inputs COMPONENT VALUE are biased outside of that range, input coupling RI 10 k Ω capacitors are required. RF 10 k Ω C(BYPASS)(1) 0.22 µF CS 1 µF CI 0.22 µF (1) C(BYPASS) is optional Figure 27. Typical Differential Input Application Schematic 9 Submit Documentation Feedback |
Аналогичный номер детали - TPA6205A1DRBT |
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Аналогичное описание - TPA6205A1DRBT |
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