wm8595 Wolfson Microelectronics plc, wm8595 Datasheet - Page 47

• Manufacturer Part Number: wm8595
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
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POWERDOWN SEQUENCE
Power supplies can now be safely removed from the WM8595 if desired.
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Mute all PGAs:
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Set up biases for power down mode:
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Switch outputs to use fast bias instead of master bias:
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Power down all WM8595 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.
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Wait until VMID2C has fully discharged. The time taken depends on system capacitance
and should be evaluated by the customer in their application.
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Clamp outputs to ground.
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Power down outputs.
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Disable remaining bias control bits.
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MUTE_ALL=1
FAST_EN=1
VMID_SEL=01
BIAS_EN=1
BUFIO_EN=1
VMIDTOG=0
SOFT_ST=1
POBCTRL=1
VMID_SEL=00
Insert delay
APE_B=0
VOUTxL_EN=0
VOUTxR_EN=0
FAST_EN=0
POBCTRL=0
BIAS_EN=0
PD, Rev 4.1, April 2010
WM8595
47