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WM8352 데이터시트(PDF) 101 Page - Wolfson Microelectronics plc

부품명 WM8352
상세설명  Wolfson AudioPlus™ Stereo CODEC with Power Management
PDF  336 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8352 데이터시트(HTML) 101 Page - Wolfson Microelectronics plc

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Production Data
WM8352
w
PD, February 2011, Rev 4.4
101
13.12.3 MID-RAIL REFERENCE (VMID)
VMID provides a potential mid-way between AVDD and GND, used in many parts of the audio
CODEC. It is generated from AVDD using on-chip potential dividers. Different resistor values can be
selected for this purpose. A medium resistance should be used when the CODEC is active. A high
resistance option provides a more power-efficient way to maintain the VMID voltage when the
CODEC is in “Standby” (i.e. inactive but ready to start immediately, without needing to wait for the
VMID capacitor to be charged). For startup and shutdown the VMID generator provides soft VMID
ramping to reduce pops and clicks. The speed of this ramp is selectable using the anti-pop controls
and can be tuned to the application.
Figure 62 Generating the Mid-rail Reference
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R8 (08h)
Power
Management 1
2
VMID_EN
A
0
Enables VMID resistor string
0 = disabled
1 = enabled
1:0
VMID [1:0]
00
(off)
Resistor selection for VMID potential divider
00 = off
01 = Vmid comes from 300kΩ R-string
10 = Vmid comes from 50kΩ R-string
11 = Vmid comes from 5kΩ R-string
Table 50 Controlling the Mid-rail Reference



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