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TPA2000D1TPWRQ1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPA2000D1TPWRQ1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page TPA2000D1Q1 2W FILTERLESS MONO CLASSD AUDIO POWER AMPLIFIER SGLS137B− SEPTEMBER 2002 − REVISED SEPTEMBER 2004 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION C2 C1 L1 L2 OUT− OUT+ Figure 11. Class-D Output Filter gain setting via GAIN0 and GAIN1 inputs The gain of the TPA2000D1 is set by two input terminals, GAIN0 and GAIN1. The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This causes the input impedance (Zi) to be dependent on the gain setting. The actual gain settings are controlled by ratios of resistors, so the actual gain distribution from part-to-part is quite good. However, the input impedance may shift by 30% due to shifts in the actual resistance of the input resistors. For design purposes, the input network (discussed in the next section) should be designed assuming an input impedance of 20 k Ω, which is the absolute minimum input impedance of the TPA2000D1. At the higher gain settings, the input impedance could increase as high as 115 k Ω. Table 2. Gain Settings GAIN0 GAIN1 AMPLIFIER GAIN (dB) INPUT IMPEDANCE (k Ω) GAIN0 GAIN1 TYP TYP 0 0 6 104 0 1 12 74 1 0 18 44 1 1 23.5 24 input resistance Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest value to over six times that value. As a result, if a single capacitor is used in the input high-pass filter, the −3 dB or cutoff frequency also changes by over six times. Ci IN Zi Zf Input Signal |
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