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WM8595 bảng dữ liệu(PDF) 47 Page - Wolfson Microelectronics plc

tên linh kiện WM8595
Giải thích chi tiết về linh kiện  24-bit 192kHz 2Vrms Multi-Channel CODEC
PDF  82 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8595 bảng dữ liệu(HTML) 47 Page - Wolfson Microelectronics plc

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Production Data
WM8595
w
PD, Rev 4.2, January 2011
47
POWERDOWN SEQUENCE
1.
Mute all PGAs:
•
MUTE_ALL=1
2.
Set up biases for power down mode:
•
FAST_EN=1
•
VMID_SEL=01
•
BIAS_EN=1
•
BUFIO_EN=1
•
VMIDTOG=0
•
SOFT_ST=1
3.
Switch outputs to use fast bias instead of master bias:
•
POBCTRL=1
4.
Power down all WM8595 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 VMID2C has fully discharged. The time taken depends on system capacitance
and should be evaluated by the customer in their application.
•
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 WM8595 if desired.



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