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WM8985GEFL/R 数据表(PDF) 91 Page - Wolfson Microelectronics plc

部件名 WM8985GEFL/R
功能描述  Multimedia CODEC with Class D Headphone and Line Out
PDF  121 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8985GEFL/R 数据表(HTML) 91 Page - Wolfson Microelectronics plc

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Production Data
WM8985
w
PD, Rev 4.6, July 2009
91
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
00 = off (250kΩ VMID to AGND1)
01=75kΩ
10=300kΩ
11=5kΩ
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
POP MINIMISATION
POBCTRL
WM8985 has two bias generators. A noisy bias derived from AVDD and a low noise bias derived
from VMID. POBCTRL is use to switch between the two bias generators. During power up, the
AVDD derived bias is available as soon as AVDD is applied; the VMID derived bias is available once
the VMID node has charged up.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R42
OUT4 to ADC
2
POB
CTRL
0
VMID independent current bias control
0 = Disable VMID independent current
bias
1 = Enable VMID independent current bias
Note:
POBCTRL should be asserted during power up to minimize pops and then de-
asserted at the end of the power up sequence to give best performance. Refer to
Recommended Power Up/Down



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