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TPA6203A1DGNG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPA6203A1DGNG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 27 page www.ti.com APPLICATION INFORMATION Advantages of Fully Differential Amplifiers APPLICATION SCHEMATICS _ + VDD VO+ VO- GND To Battery Cs Bias Circuitry IN- IN+ + - In From DAC SHUTDOWN RI RI C( ) BYPASS (Optional) RF RF TPA6203A1 SLOS364E – MARCH 2002 – REVISED DECEMBER 2005 • 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 TPA6203A1 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 bypass common- mode amplifier. The differential amplifier capacitor slightly worsens power supply rejection ensures that the amplifier outputs a differential ratio (kSVR), but a slight decrease of kSVR may be voltage that is equal to the differential input times the acceptable when an additional component can be gain. The common-mode feedback ensures that the eliminated (see Figure 17). common-mode voltage at the output is biased around • Better RF-immunity: GSM handsets save power VDD/2 regardless of the common- mode voltage at the by turning on and shutting off the RF transmitter 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 TPA6203A1, allows the inputs to be biased at voltage other than mid-supply. For example, if a Figure 28 through Figure 30 show application DAC has mid-supply lower than the mid-supply of schematics for differential and single-ended inputs. the TPA6203A1, the common-mode feedback Typical values are shown in Table 1. circuit adjusts for that, and the TPA6203A1 outputs are still biased at mid-supply of the Table 1. Typical Component Values TPA6203A1. The inputs of the TPA6203A1 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 28. Typical Differential Input Application Schematic 9 |
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