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WM8993 Datasheet(PDF) 218 Page - Wolfson Microelectronics plc

Part # WM8993
Description  Audio Hub CODEC for Multimedia Phones
PDF  229 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8993 Datasheet(HTML) 218 Page - Wolfson Microelectronics plc

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WM8993
Production Data
w
PD, November 2010, Rev 4.0
218
APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
AUDIO INPUT PATHS
The WM8993 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 85.
Figure 85 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 85 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 114.
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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