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TPA2010D1YZFR 데이터시트(PDF) 11 Page - Texas Instruments |
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TPA2010D1YZFR 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 23 page www.ti.com _ + IN- IN+ PWM H- Bridge VO+ VO- Internal Oscillator CS To Battery VDD GND Bias Circuitry RI RI Differential Input TPA2010D1 Filter-Free Class D SHUTDOWN CI CI _ + IN- IN+ PWM H- Bridge VO+ VO- Internal Oscillator CS To Battery VDD GND Bias Circuitry RI RI Single-ended Input TPA2010D1 Filter-Free Class D SHUTDOWN CI CI SUMMING INPUT SIGNALS WITH THE TPA2010D1 Summing Two Differential Input Signals Gain 1 + V O V I1 + 2 x 150 kW R I1 V V (4) Gain 2 + V O V I2 + 2 x 150 kW R I2 V V (5) TPA2010D1 SLOS417B – OCTOBER 2003 – REVISED JULY 2006 Figure 28. TPA2010D1 Application Schematic With Differential Input and Input Capacitors Figure 29. TPA2010D1 Application Schematic With Single-Ended Input Most wireless phones or PDAs need to sum signals at the audio power amplifier or just have two signal sources that need separate gain. The TPA2010D1 makes it easy to sum signals or use separate signal sources with different gains. Many phones now use the same speaker for the earpiece and ringer, where the wireless phone would require a much lower gain for the phone earpiece than for the ringer. PDAs and phones that have stereo headphones require summing of the right and left channels to output the stereo signal to the mono speaker. Two extra resistors are needed for summing differential signals (a total of 5 components). The gain for each input source can be set independently (see Equation 4 and Equation 5, and Figure 30). If summing left and right inputs with a gain of 1 V/V, use RI1 = RI2 = 300 kΩ. 11 Submit Documentation Feedback |
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