WM8594_07 Wolfson Microelectronics Ltd., WM8594_07 Datasheet - Page 45

• Manufacturer Part Number: WM8594_07
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics Ltd.

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Power supplies can now be safely removed from the WM8594 if desired. Table 34 describes the
various bias control bits for power up/down control.
3.
4.
5.
6.
7.
8.
9.
•
•
•
Switch outputs to use fast bias instead of master bias:
•
Power down all WM8594 functions (ADC, DACs, PGAs etc.). The outputs are muted so the
write order is not important.
Power down VMID to allow the analogue outputs to ramp gently to ground in a pop-free
manner.
•
Wait until DACVMID has fully discharged. The time taken depends on system capacitance.
•
Clamp outputs to ground.
•
Power down outputs.
•
•
Disable remaining bias control bits.
•
•
•
BUFIO_EN=1
VMIDTOG=1
SOFT_ST=0
POBCTRL=1
VMID_SEL=00
Insert delay
APE_B=0
VOUTxL_EN=0
VOUTxR_EN=0
FAST_EN=0
POBCTRL=0
BIAS_EN=0
PP Rev 1.0 January 2007
WM8594
45