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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8959 датащи(PDF) 22 Page - Wolfson Microelectronics plc |
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WM8959 датащи(HTML) 22 Page - Wolfson Microelectronics plc |
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22 / 155 page  WM8959 Pre-Production w PP, May 2008, Rev 3.1 22 SPEAKER DRIVER PERFORMANCE Typical speaker driver THD+N performance is shown below for both Class D and Class AB modes. Curves are shown for four typical SPKVDD supply voltage and gain combinations. Load RL = 8 Ω + 10µH, Frequency = 1kHz, +1dB gain in active path. SPEAKER CLASS D INTO 8 Ω + 10µH SPEAKER CLASS AB INTO 8 Ω + 10µH Speaker Class D (8Ω+10µH) THD+N Ratio v Output Power 0.001 0.01 0.1 1 10 0 0.25 0.5 0.75 1 1.25 1.5 Output Power (W) SPKVDD=5.0V, AC=DC=1.52x SPKVDD=4.2V, AC=DC=1.27x SPKVDD=3.6V, AC=DC=1.00x SPKVDD=3.3V, AC=DC=1.00x Speaker Class AB (8Ω+10µH) THD+N Ratio v Output Power 0.001 0.01 0.1 1 10 0 0.25 0.5 0.75 1 1.25 1.5 Output Power (W) SPKVDD=5.0V, AC=DC=1.52x SPKVDD=4.2V, AC=DC=1.27x SPKVDD=3.6V, AC=DC=1.00x SPKVDD=3.3V, AC=DC=1.00x HEADPHONE DRIVER PERFORMANCE Typical THD+N performance of the Headphone Drivers is shown below (AC coupled to LOUT/ROUT). Curves are shown for four HPVDD/AVDD supply voltages. Load RL = 16 Ω and 32Ω, Frequency = 1kHz, +1dB gain in active path. AC COUPLED HEADPHONE INTO 16 Ω AC COUPLED HEADPHONE INTO 32 Ω AC Coupled Headphone (16ohm) THD+N Ratio v Output Power 0.01 0.1 1 10 0 10 2030 40 5060 7080 Output Power (mW) HPVDD=AVDD=3.6V HPVDD=AVDD=3.3V HPVDD=AVDD=3.0V HPVDD=AVDD=2.7V AC Coupled Headphone (32ohm) THD+N Ratio v Output Power 0.01 0.1 1 10 0 1020 30405060 7080 Output Power (mW) HPVDD=AVDD=3.6V HPVDD=AVDD=3.3V HPVDD=AVDD=3.0V HPVDD=AVDD=2.7V |
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