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WM8940CGEFL/RV 数据表(PDF) 69 Page - Wolfson Microelectronics plc

部件名 WM8940CGEFL/RV
功能描述  Mono CODEC with Speaker Driver
PDF  91 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8940CGEFL/RV 数据表(HTML) 69 Page - Wolfson Microelectronics plc

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Production Data
WM8940
w
PD, Rev 4.3, November 2011
69
POP MINIMISATION
Power-On-Bias Control (POB_CTRL) selects the bias current source for the output stages of the
WM8940. 0 selects the VMID derived bias source (normal operation), 1 selects a non-VMID derived
source which allows the output amplifiers to be enabled before VMID at start-up. This feature can be
used to minimise pops. Once VMID is enabled and has stabilised, POBCTRL should be set to 0.
Register SOFT_START is the enable bit for the VMID soft-start function. Setting the bit to 1 causes
charging of the VMID decoupling cap to follow a soft-start profile which minimises pops. This soft-
start profile has minimal impact on VMID charge time.
Fast VMID discharge is enabled using TOGGLE. Setting to 1 opens a low impedance discharge path
from VMID to GND. This function can be used during power down to reduce the discharge time of the
VMID decoupling cap. Must be set to 0 for normal operation.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R7
Additional
Control
6
POB_CTRL
0
Power on Bias Control
0=normal (current bias based on VMID)
1=Startup (current bias not based on
VMID)
5
SOFT_START
0
VMID Soft Start
0=disabled
1=enabled
4
TOGGLE
0
Fast VMID Discharge
0=normal
1=enable (used during power-down)
Table 60 POP Minimisation Control



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