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AS3525 데이터시트(PDF) 135 Page - ams AG |
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AS3525 데이터시트(HTML) 135 Page - ams AG |
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135 / 194 page ![]() AS3525-A/-B C22O22 Data Sheet, Confidential © 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.13 135 - 194 7.4.7.5 Power Save Options When driving > 4 Ω, two power save options can be chosen. The output driver stage can be set to only 25% drive capacity, which will reduce the maximum output power. Additionally the bias currents can be reduced to 50% in 3 steps. Table 116 Speaker Power-Save Options LSP_LP IBR_LSP IDD_LSP (typ.) Load 0 00 8mA 4 Ohm 1 00 2.8mA 16-32 Ohm 1 01 2.4mA 16-32 Ohm 1 10 1.9mA 16-32 Ohm 1 11 1.5mA 16-32 Ohm BVDD = 3.3V, TA= 25oC unless otherwise mentioned 7.4.7.6 Parameter Table 117 Speaker Amplifier Parameter Symbol Parameter Notes Min Typ Max Unit stereo mode 4 Ohm RL Output Load mono differential mode 8 Ohm Pout Maximum Output Power RL= 8 Ω 1 W A0 Gain programmable gain -40.5 6 dB Ax Gain Step-Size 1.5 dB PSRR Power Supply Rejection Ratio 200Hz-20kHz, 720mVpp, no load 70 75 dB Short Current Protection Level 700 mA IOUT_pd IOUT power down -20 20 uA Tpower_up 100 ms SNR Signal to Noise Ratio 90 dB Mute Attenuation 120 dB BVDD = 5V, TA= 25oC unless otherwise mentioned |
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