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WM8510GEDS/V датащи(PDF) 58 Page - Wolfson Microelectronics plc

номер детали WM8510GEDS/V
подробное описание детали  Mono CODEC with Speaker Driver
PDF  81 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8510GEDS/V датащи(HTML) 58 Page - Wolfson Microelectronics plc

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WM8510
Production Data
w
PD Rev 4.1 December 2006
58
Power Down (all cases):
1.
Soft mute DAC by setting DACMU = 1.
2.
Disable power management register 1 by setting R1[8:0]=0x000
3.
Disable all other output stages.
4.
Turn off external power supplies.
Notes:
1.
This step enables the internal device bias buffer and the VMID buffer for unassigned
inputs/outputs. This will provide a startup reference voltage for all inputs and outputs. This will
cause the inputs and outputs to ramp towards VMID (NOT using output 1.5x boost) or 1.5 x
(AVDD/2) (using output 1.5x boost) in a way that is controlled and predictable (see note 2).
2.
Choose the value of the VMIDSEL bits based on the startup time (VMIDSEL=10 for slowest
startup, VMIDSEL=11 for fastest startup). Startup time is defined by the value of the VMIDSEL
bits (the reference impedance) and the external decoupling capacitor on VMID.
In addition to the power on sequence, it is recommended that the zero cross functions are used when
changing the volume in the PGAs to avoid any audible pops or clicks.
V
pora
DGND
Internal POR active
Device Ready
No Power
V
por_off
Power Supply
POR
I2S Clocks
ADC Internal
State
t
midrail_on
Analogue Inputs
ADCDAT pin
GD
ADCEN bit
Power down
Init
Normal Operation
Normal Operation
Init
PD
Power down
ADC enabled
ADC enabled
ADC off
t
adcint
DNC
INPPGAEN bit
t
adcint
INPPGA enabled
DNC
GD
GD
GD
POR
POR Undefined
VMID enabled
VMIDSEL/
BIASEN bits
AVDD/2
t
midrail_off
(Note 1)
(Note 2)
(Note 3)
(Note 4)
V
por_on
Figure 34 ADC Power Up and Down Sequence (not to scale)
SYMBOL
MIN
TYPICAL
MAX
UNIT
tmidrail_on
500
ms
tmidrail_off
>10
s
tadcint
2/fs
n/fs
Table 51 Typical POR Operation (typical values, not tested)



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