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TPA6204A1DRBR Fiches technique(PDF) 8 Page - Texas Instruments |
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TPA6204A1DRBR Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 18 page TPA6204A1 SLOS429 − MAY 2004 www.ti.com 8 APPLICATION INFORMATION FULLY DIFFERENTIAL AMPLIFIER The TPA6204A1 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier consists of a differential amplifier and a common- mode amplifier. The differential amplifier ensures that the amplifier outputs a differential voltage that is equal to the differential input times the gain. The common-mode feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the common- mode voltage at the input. Advantages of Fully Differential Amplifiers D Input coupling capacitors not required: A fully differential amplifier with good CMRR, like the TPA6204A1, allows the inputs to be biased at voltage other than mid-supply. For example, if a DAC has mid-supply lower than the mid-supply of the TPA6204A1, the common-mode feedback circuit adjusts for that, and the TPA6204A1 outputs are still biased at mid-supply of the TPA6204A1. The inputs of the TPA6204A1 can be biased from 0.5 V to VDD − 0.8 V. If the inputs are biased outside of that range, input coupling capacitors are required. D Mid-supply bypass capacitor, C (BYPASS), not required: The fully differential amplifier does not require a bypass capacitor. This is because any shift in the mid- supply affects both positive and negative channels equally and cancels at the differential output. However, removing the bypass capacitor slightly worsens power supply rejection ratio (kSVR), but a slight decrease of kSVR may be acceptable when an additional component can be eliminated. D Better RF-immunity: GSM handsets save power by turning on and shutting off the RF transmitter 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 better than the typical audio amplifier. APPLICATION SCHEMATICS Figure 15 through Figure 17 show application schematics for differential and single-ended inputs. Typical values are shown in Table 1. Table 1. Typical Component Values COMPONENT VALUE RI 40 k Ω C(BYPASS)(1) 0.22 µF CS 1 µF CI 0.22 µF (1) C(BYPASS) is optional _ + VDD VO+ VO− GND 6 5 8 7 To Battery Cs Bias Circuitry IN− IN+ 4 3 2 + − In From DAC SHUTDOWN RI RI 1 C(BYPASS)(1) 100 k Ω 40 k Ω 40 k Ω (1) C(BYPASS) is optional Figure 15. Typical Differential Input Application Schematic |
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