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TPA6139A2RGTT датащи(PDF) 11 Page - Texas Instruments |
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TPA6139A2RGTT датащи(HTML) 11 Page - Texas Instruments |
11 / 22 page Supply ramp Supply MUTE Time for ac-coupling capasitors to charge fc IN + 1 2p R IN CIN C IN + 1 2p fc IN RIN or TPA6139A2 www.ti.com SLOS700B – JANUARY 2011 – REVISED JUNE 2012 Input-Blocking Capacitors DC input-blocking capacitors are required to be added in series with the audio signal into the input pins of the TPA6139A2. These capacitors block the dc portion of the audio source and allow the TPA6139A2 inputs to be properly biased to provide maximum performance. The input blocking capacitors also limit the DC gain to 1, limiting the DC-offset voltage at the output. These capacitors form a high-pass filter with the input resistor, RIN. The cutoff frequency is calculated using Equation 1. For this calculation, the capacitance used is the input-blocking capacitor and the resistance is the input resistor chosen from Table 1. Then the frequency and/or capacitance can be determined when one of the two values is given. (1) For a fixed cutoff frequency of 2Hz the size of the input capacitance is shown in the table below with the capacitors rounded up to nearest E6 values. For 20Hz cutoff simply divide the capacitor values with 10; e.g., for 1x gain, 150nF is needed. Table 2. Input Capacitor for Different Gain and Cutoff Gain_set Gain INPUT 2 Hz GAIN RESISTOR (dB) RESISTANCE Cutoff 249k –2.0x 6.0 37k 2.2 µF 82k0 –1.0x 0.0 55k 1.5 µF 49k2 –1.5x 3.5 44k 2.2 µF 35k1 –2.3x 7.2 33k 3.3 µF 27k3 –2.5x 8.0 31k 3.3 µF 20k5 –3.0x 9.5 28k 3.3 µF 15k4 –3.5x 10.9 24k 3.3 µF 11k5 –4.0x 12.0 22k 4.7 µF 9k09 –5.0x 14.0 18k 4.7 µF 7k50 –5.6x 15.0 17k 4.7 µF 6k19 –6.4x 16.1 15k 6.8 µF 5k11 –8.3x 18.4 12k 6.8 µF 3k90 –10x 20.0 10k 10 µF Pop-Free Power Up Pop-free power up is ensured by keeping the MUTE low during power supply ramp up and down. The pin should be kept low until the input AC-coupling capacitors are fully charged before asserting the MUTE pin high to pre- charge the ac-coupling; and, pop-less power-up is achieved. Figure 10 illustrates the preferred sequence. Figure 10. Power-Up Sequence Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s) :TPA6139A2 |
Аналогичный номер детали - TPA6139A2RGTT |
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Аналогичное описание - TPA6139A2RGTT |
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