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WM8904ECS/R 数据表(PDF) 41 Page - Wolfson Microelectronics plc

部件名 WM8904ECS/R
功能描述  Ultra Low Power CODEC for Portable Audio Applications
PDF  188 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8904ECS/R 数据表(HTML) 41 Page - Wolfson Microelectronics plc

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Pre-Production
WM8904
w
PP, Rev 3.3, September 2012
41
INPUT PGA COMMON MODE AMPLIFIER
In Differential Line Mode only, a Common Mode amplifier can be enabled as part of the input PGA
circuit. This feature provides approximately 20dB reduction in common mode noise on the differential
input, which can reduce problematic interference. Since the ADC has differential signal inputs, it has
an inherent immunity to common mode noise (see “Electrical Characteristics”) However, the presence
of Common Mode noise can limit the usable signal range of the ADC path; enabling the Common
Mode amplifier can solve this issue.
It should be noted that the Common Mode amplifier consumes additional power and can also add its
own noise to the input signal. For these reasons, it is recommended that the Common Mode Amplifier
is only enabled if there is a known source of Common Mode interference.
The Common Mode amplifier is controlled by the INL_CM_ENA and INR_CM_ENA fields as
described in Table 5. Although the Common Mode amplifier may be enabled regardless of the input
PGA mode, its function is only effective in the Differential Line Mode configuration.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R46 (2Eh)
Analogue Left
Input 1
6
INL_CM_ENA
1
Left Input PGA Common Mode
Rejection enable
0 = Disabled
1 = Enabled
(only available for L_MODE=01 –
Differential Line)
R47 (2Fh)
Analogue
Right Input 1
6
INR_CM_ENA
1
Right Input PGA Common Mode
Rejection enable
0 = Disabled
1 = Enabled
(only available for R_MODE=01 –
Differential Line)
Table 5 Common Mode Amplifier Enable



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