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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8599SEFT/V 데이터시트(PDF) 41 Page - Wolfson Microelectronics plc |
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WM8599SEFT/V 데이터시트(HTML) 41 Page - Wolfson Microelectronics plc |
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41 / 74 page  Product Preview WM8599 w PP Rev 1.0 January 2007 41 • BUFIO_EN=1 • VMIDTOG=1 • SOFT_ST=0 3. Switch outputs to use fast bias instead of master bias: • POBCTRL=1 4. Power down all WM8599 functions (ADC, DACs, PGAs etc.). The outputs are muted so the write order is not important. 5. Power down VMID to allow the analogue outputs to ramp gently to ground in a pop-free manner. • VMID_SEL=00 6. Wait until DACVMID has fully discharged. The time taken depends on system capacitance. • Insert delay 7. Clamp outputs to ground. • APE_B=0 8. Power down outputs. • VOUTxL_EN=0 • VOUTxR_EN=0 9. Disable remaining bias control bits. • FAST_EN=0 • POBCTRL=0 • BIAS_EN=0 Power supplies can now be safely removed from the WM8599 if desired. Table 30 describes the various bias control bits for power up/down control. |
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