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TPA6203A1DGNRG4 데이터시트(PDF) 9 Page - Texas Instruments |
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TPA6203A1DGNRG4 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 29 page APPLICATION INFORMATION FULLY DIFFERENTIAL AMPLIFIER APPLICATION SCHEMATICS Advantages of Fully Differential Amplifiers _ + VDD VO+ VO- GND ToBattery Cs Bias Circuitry IN- IN+ + - InFrom DAC SHUTDOWN RI RI C( ) BYPASS (Optional) RF RF TPA6203A1 www.ti.com.......................................................................................................................................................... SLOS364F – MARCH 2002 – REVISED JUNE 2008 negative channels equally and cancels at the differential output. However, removing the bypass capacitor slightly worsens power supply rejection The TPA6203A1 is a fully differential amplifier with ratio (kSVR), but a slight decrease of kSVR may be differential inputs and outputs. The fully differential acceptable when an additional component can be amplifier consists of a differential amplifier and a eliminated (see Figure 17). common- mode amplifier. The differential amplifier • Better RF-immunity: GSM handsets save power ensures that the amplifier outputs a differential by turning on and shutting off the RF transmitter at voltage that is equal to the differential input times the a rate of 217 Hz. The transmitted signal is gain. The common-mode feedback ensures that the picked-up on input and output traces. The fully common-mode voltage at the output is biased around differential amplifier cancels the signal much VDD/2 regardless of the common- mode voltage at the better than the typical audio amplifier. input. • Input coupling capacitors not required: A fully Figure 28 through Figure 30 show application differential amplifier with good CMRR, like the schematics for differential and single-ended inputs. TPA6203A1, allows the inputs to be biased at Typical values are shown in Table 1. voltage other than mid-supply. For example, if a DAC has mid-supply lower than the mid-supply of Table 1. Typical Component Values the TPA6203A1, the common-mode feedback COMPONENT VALUE circuit adjusts for that, and the TPA6203A1 RI 10 k Ω outputs are still biased at mid-supply of the RF 10 k Ω TPA6203A1. The inputs of the TPA6203A1 can be biased from 0.5 V to VDD - 0.8 V. If the inputs C(BYPASS) (1) 0.22 µF are biased outside of that range, input coupling CS 1 µF capacitors are required. CI 0.22 µF • Mid-supply bypass capacitor, C (BYPASS), not (1) C(BYPASS) is optional required: The fully differential amplifier does not require a bypass capacitor. This is because any shift in the mid-supply affects both positive and Figure 28. Typical Differential Input Application Schematic Copyright © 2002–2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TPA6203A1 |
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