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WM8961GEFL/V Datasheet(PDF) 25 Page - Wolfson Microelectronics plc

Part # WM8961GEFL/V
Description  Ultra-Low Power Stereo CODEC with 1W Stereo Class D Speaker Drivers and Ground Referenced Headphone Drivers
PDF  116 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8961GEFL/V Datasheet(HTML) 25 Page - Wolfson Microelectronics plc

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WM8961
Pre-Production
w
PP, August 2009, Rev 3.1
25
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R32 (20h)
ADCL signal
path
5:4
LMICBOOST
[1:0]
00
Left Channel Input PGA Boost Gain
00 = +0dB
01 = +13dB
10 = +20dB
11 = +29dB
R33 (21h)
ADCR signal
path
5:4
RMICBOOST
[1:0]
00
Right Channel Input PGA Boost Gain
00 = +0dB
01 = +13dB
10 = +20dB
11 = +29dB
Table 7 Microphone PGA Boost Control
The output of the boost stage drives the ADC.
MICROPHONE INPUT CONNECTION EXAMPLE AND MICROPHONE
BIASING
The input PGAs can be configured to use a single-ended input microphone. In the single ended
microphone input configuration the microphone signal can be input to LINPUT. An example of this is
shown in Figure 13 which also shows the microphone biasing.
Figure 13 Single Ended Microphone Configuration Example
MICROPHONE BIASING CIRCUIT
The MICBIAS output pin 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 MBSEL register
bit. When MBSEL=0, MICBIAS=5/6
×AVDD and when MBSEL=1,
MICBIAS=7/6
×AVDD. The output can be enabled or disabled using the MICB control bit. (Note that
MBSEL=1 only allowed if MICVDD is greater than +2.40V)
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R25 (19h)
Power
management (1)
1
MICB
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
R48 (30h)
Additional Control
(4)
0
MBSEL
1
Microphone Bias Voltage Control
1 = 7/6 * AVDD
0 = 5/6 * AVDD
Table 8 Microphone Bias Control



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