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WM8985GEFL/R bảng dữ liệu(PDF) 88 Page - Wolfson Microelectronics plc

tên linh kiện WM8985GEFL/R
Giải thích chi tiết về linh kiện  Multimedia CODEC With Class D Headphone and Line Out
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
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WM8985GEFL/R bảng dữ liệu(HTML) 88 Page - Wolfson Microelectronics plc

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WM8985
Pre-Production
w
PP, Rev 3.4, October 2006
88
VMID
The analogue circuitry will not operate unless VMID is enabled. The impedance of the VMID resistor
string, together with the decoupling capacitor on the VMID pin will determine the start-up time of the
VMID circuit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1 (01h)
Power
management 1
1:0
VMIDSEL
00
Reference string impedance to VMID pin
(Determines startup time):
00 = off (250kΩ VMID to AGND1)
01 = 100kΩ
10 = 500kΩ
11 = 10kΩ (for fast startup)
Table 51 VMID Impedance Control
BIASEN
The analogue amplifiers will not operate unless BIASEN is enabled.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1 (01h)
Power
management 1
3
BIASEN
0
Analogue amplifier bias control
0 = disabled
1 = enabled
Table 52 Analogue Bias Control



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