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WM8952ECS/RV Scheda tecnica(PDF) 20 Page - Wolfson Microelectronics plc

Il numero della parte WM8952ECS/RV
Spiegazioni elettronici  Mono ADC with Microphone Pre-amplifier
PDF  72 Pages
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Produttore elettronici  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8952ECS/RV Scheda tecnica(HTML) 20 Page - Wolfson Microelectronics plc

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WM8952
Pre Production
w
PP, Rev 3.1, June 2011
20
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R47
Input BOOST
control
6:4
MICP2BOOSTVOL
000
Controls the MICP pin to the input boost
stage (NB, when using this path set
MICP2INPPGA=0):
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
…
111=+6dB gain through boost stage
2:0
AUX2BOOSTVOL
000
Controls the auxiliary amplifier to the input
boost stage:
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
…
111=+6dB gain through boost stage
Table 7 Input BOOST Stage Control
The BOOST stage is enabled under control of the BOOSTEN register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
management 2
4
BOOSTEN
0
Input BOOST enable
0 = Boost stage OFF
1 = Boost stage ON
Table 8 Input BOOST Enable Control
MICROPHONE BIASING CIRCUIT
The MICBIAS output provides a low noise reference voltage suitable for biasing electret type
microphones and the associated external resistor biasing network. Refer to the Applications
Information section for recommended external components. The MICBIAS voltage can be altered via
the MBVSEL register bit.
When MBVSEL=0, MICBIAS=0.9*AVDD and when MBVSEL=1,
MICBIAS=0.65*AVDD. The output can be enabled or disabled using the MICBEN control bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
4
MICBEN
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
Table 9 Microphone Bias Enable
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R44
Input Control
8
MBVSEL
0
Microphone Bias Voltage Control
0 = 0.9 * AVDD
1 = 0.65 * AVDD
Table 10 Microphone Bias Voltage Control



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