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AS3658F-BCTP Datasheet(PDF) 90 Page - ams AG |
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AS3658F-BCTP Datasheet(HTML) 90 Page - ams AG |
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90 / 158 page  www.austriamicrosystems.com Revision 1v13 89 - 157 AS3658 Data Sheet Confidential - Detail ed Descri ption- Audio Functi ons Figure 39. AS3658 Microphone Recording and I2S I/O Playback (either I2S 1 or I2S 2/PCM) Figure 40. AS3658 Recording of the Mixed output signal and parallel playback (either I2S 1 or I2S 2/PCM) 9.2 Common mode voltage generation of HP_CM, LINE_CM The common mode voltage of the Headphone and Lineout is stored in the C_hpcm and C_linecm capacitor (connected between HP_CM to VSS and LINE_CM to VSS). These capacitor are also responsible for the popless startup, PSRR of the amplifiers and sense path of the GND cancellation circuit. Startup and PSRR is defined by the value of the external capacitors. The RC limits the maximum achievable PSRR: R=6M Ω typ, C=0.1...1µF: Table 88. common mode voltage, Audio start-up and PSRR Capacitor value for C_hpcm and C_linecm Startup time (typ) Maximum achievable PSRR @ 1kHz (typ) @ 100Hz (typ) µF msec dB dB 0.1 150 76 56 1 1500 90 76 |
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