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TPA6203A1DRBRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPA6203A1DRBRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 27 page www.ti.com _ + VDD VO+ VO- GND To Battery Cs Bias Circuitry IN- IN+ + - IN SHUTDOWN RI RI RF RF CI CI C( ) BYPASS (Optional) _ + VDD VO+ VO- GND To Battery Cs Bias Circuitry IN- IN+ IN SHUTDOWN RI RF CI CI RI RF C( ) BYPASS (Optional) Bypass Capacitor (CBYPASS) and Start-Up Time Selecting Components Resistors (RF and RI) Gain = RF/RI (1) TPA6203A1 SLOS364E – MARCH 2002 – REVISED DECEMBER 2005 Figure 29. Differential Input Application Schematic Optimized With Input Capacitors Figure 30. Single-Ended Input Application Schematic The internal voltage divider at the BYPASS pin of this device sets a mid-supply voltage for internal references and sets the output common mode The input (RI) and feedback resistors (RF) set the voltage to VDD/2. Adding a capacitor to this pin filters gain of the amplifier according to Equation 1. any noise into this pin and increases the kSVR. C(BYPASS)also determines the rise time of VO+ and VO- when the device is taken out of shutdown. The larger RF and RI should range from 1 kΩ to 100 kΩ. Most the capacitor, the slower the rise time. Although the graphs were taken with RF = RI = 20 kΩ. output rise time depends on the bypass capacitor Resistor matching is very important in fully differential value, the device passes audio 4 µs after taken out of amplifiers. The balance of the output on the reference shutdown and the gain is slowly ramped up based on voltage depends on matched ratios of the resistors. C(BYPASS). CMRR, PSRR, and the cancellation of the second To minimize pops and clicks, design the circuit so the harmonic distortion diminishes if resistor mismatch impedance (resistance and capacitance) detected by occurs. Therefore, it is recommended to use 1% both inputs, IN+ and IN-, is equal. tolerance resistors or better to keep the performance optimized. 10 |
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