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BK3266SO16A Datasheet(PDF) 14 Page - Beken Corporation |
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BK3266SO16A Datasheet(HTML) 14 Page - Beken Corporation |
14 / 28 page ![]() Low Power Bluetooth Audio SoC v 0.5 © 2017 Beken Corporation Proprietary and Confidential Page 14 of 28 software configuration tool kit. For more information, please refer to the BK3266 Software Configuration Tool Users Guide. 3.5.2. Stereo ADC and DAC The BK3266 contains high fidelity 96 dB SNR stereo ADCs with sample rates of 8 kHz, 16 kHz, 44.1 kHz, or 48 kHz. The chip also integrates high fidelity 96 dB SNR stereo DACs with sample rates of 8 kHz, 16 kHz, 44.1 kHz or 48 kHz. 3.5.3. Microphone Input Amplifier and Bias BK3266 contains a fully differential analog microphone input amplifier and a low- noise microphone bias generator. Expensive external components are not needed as the microphone amplifier and active bias circuitry are integrated into the chip allowing the microphone to be interfaced with only cheap passive resistors and capacitors. The microphone signal can be amplified with gain from -8 ~ 38dB with 0.5 dB step. MIC R3 2 k C5 1uF R4 2 k C9 1uF C6 1uF MICRP MICRN MICREF MIC R4 3.9 k C9 1uF C6 1uF MICRP MICREF Differential Mode Single_End Mode Figure 7. Microphone Interface 3.5.4. Line-in Input BK3266 includes stereo line-in inputs which connect to the stereo left and right channel ADCs through a 0~6 dB amplifier with 2 dB step. The digitized line-in inputs can be further processed with the 5-band equalizer prior to digital-to- analog conversion. |
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