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WM1811A Datasheet(PDF) 310 Page - Wolfson Microelectronics plc

Part # WM1811A
Description  Multi-Channel Audio Hub CODEC for Smartphones
PDF  328 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM1811A Datasheet(HTML) 310 Page - Wolfson Microelectronics plc

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WM1811A
Production Data
w
PD, November 2013, Rev 4.1
310
APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
AUDIO INPUT PATHS
The WM1811A provides 8 analogue audio inputs. Each of these inputs is referenced to the internal
DC reference, VMID. A DC blocking capacitor is required for each input pin used in the target
application. The choice of capacitor is determined by the filter that is formed between that capacitor
and the input impedance of the input pin. The circuit is illustrated in Figure 82.
Figure 82 Audio Input Path DC Blocking Capacitor
If the input impedance is known, and the cut-off frequency is known, then the minimum capacitor
value may be derived easily. However, it can be seen from the representation in Figure 82 that the
input impedance is not fixed in all applications but can vary with gain and boost amplifier settings.
The PGA input resistance for every gain setting is detailed in Table 135.
IN1L_VOL[4:0],
IN2L_VOL[4:0],
IN1R_VOL[4:0],
IN2R_VOL[4:0]
VOLUME
(dB)
INPUT RESISTANCE
(kΩ)
SINGLE-ENDED
MODE
DIFFERENTIAL
MODE
00000
-16.5
58
52.5
00001
-15.0
56.9
50.6
00010
-13.5
55.6
48.6
00011
-12.0
54.1
46.4
00100
-10.5
52.5
44.1
00101
-9.0
50.7
41.5
00110
-7.5
48.6
38.9
00111
-6.0
46.5
36.2
01000
-4.5
44.1
33.4
01001
-3.0
41.6
30.6
01010
-1.5
38.9
27.8
01011
0
36.2
25.1
01100
+1.5
33.4
22.5
01101
+3.0
30.6
20.0
01110
+4.5
27.8
17.7
01111
+6.0
25.1
15.6
10000
+7.5
22.5
13.6
10001
+9.0
20.1
11.9
10010
+10.5
17.8
10.3
10011
+12.0
15.6
8.9
10100
+13.5
13.7
7.6



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