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TPA2008D2PWPR Scheda tecnica(PDF) 6 Page - Texas Instruments |
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TPA2008D2PWPR Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 24 page www.ti.com TPA2008D2 SLOS413C – JULY 2003 – REVISED MAY 2004 Table 1. TYPICAL DC VOLUME CONTROL VOLTAGE ON VOLUME PIN VOLTAGE ON VOLUME PIN TYPICAL GAIN OF AMPLIFIER (V) (V) (dB) (1) (INCREASING OR FIXED GAIN) (DECREASING GAIN) 0-0.33 0.31-0 -38(2) 0.34-0.42 0.43-0.32 -37 0.43-0.52 0.54-0.44 -35 0.53-0.63 0.64-0.55 -33 0.64-0.75 0.75-0.65 -31 0.76-0.86 0.86-0.76 -29 0.87-0.97 0.97-0.87 -27 0.98-1.07 1.08-0.98 -25 1.08-1.18 1.19-1.09 -23 1.19-1.30 1.32-1.20 -21 1.31-1.41 1.42-1.33 -19 1.42-1.52 1.53-1.43 -17 1.53-1.63 1.63-1.54 -15 1.64-1.75 1.75-1.64 -13 1.76-1.85 1.84-1.76 -12 1.86-1.96 1.96-1.85 -10 1.97-2.07 2.09-1.97 -8 2.08-2.18 2.19-2.10 -6 2.19-2.30 2.33-2.20 -4 2.31-2.40 2.43-2.34 -2 2.41-2.52 2.49-2.44 0(2) 2.53-2.63 2.62-2.50 2 2.64-2.75 2.75-2.63 4 2.76-2.87 2.85-2.76 6 2.88-2.98 2.99-2.86 8 2.99-3.10 3.12-3.00 10 3.11-3.22 3.25-3.13 12 3.23-3.33 3.36-3.26 14 3.34-3.47 3.48-3.37 16 3.48-3.69 3.64-3.49 18 3.70-VDD VDD-3.65 20(2) (1) The typical part-to-part gain variation can be as large as ±2 dB (one gain step). (2) Tested in production. The volume control circuitry of the TPA2008D2 is internally referenced to the VDD and AGND terminals. Any common-mode noise between the VOLUME terminal and these terminals will be sensed by the volume control circuitry. If the noise exceeds the step size voltage, the gain will change. In order to minimize this effect, care must be taken to ensure the signal driving the VOLUME terminal is referenced to the VDD and AGND terminals of the TPA2008D2. See section titled, “Special Layout Considerations” for more details. 6 |
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