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WM8950 bảng dữ liệu(PDF) 40 Page - Wolfson Microelectronics plc

tên linh kiện WM8950
Giải thích chi tiết về linh kiện  ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
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WM8950 bảng dữ liệu(HTML) 40 Page - Wolfson Microelectronics plc

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WM8950
Preliminary Technical Data
w
PTD Rev 2.1 June 2005
40
BIASEN
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
3
BIASEN
0
Analogue amplifier bias control
Table 36 BIASEN Control
ESTIMATED SUPPLY CURRENTS
When the ADC is enabled it is estimated that approximately 4mA will be drawn from DCVDD when
fs=48kHz (This will be lower at lower sample rates). When the PLL is enabled an additional 700
microamps will be drawn from DCVDD.
Table 59 shows the estimated 3.3V AVDD current drawn by various circuits, by register bit.
REGISTER BIT
AVDD CURRENT (MILLIAMPS)
BUFDCOPEN
0.1
PLLEN
1.4 (with clocks applied)
MICBEN
0.5
BIASEN
0.3
BUFIOEN
0.1
VMIDSEL
10K=>0.3, less than 0.1 for 100k/500k
INPPGAEN
0.2
ADCEN
x64 (ADCOSR=0)=>2.6, x128 (ADCOSR=1)=>4.9
Table 37 AVDD Supply Current



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