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WM8994ECS/R Datasheet(PDF) 349 Page - Cirrus Logic

Part # WM8994ECS/R
Description  Multi-channel Audio Hub CODEC for Smartphones
PDF  363 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8994ECS/R Datasheet(HTML) 349 Page - Cirrus Logic

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WM8994
Rev 4.6
349
APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
AUDIO INPUT PATHS
The WM8994 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 87.
PGA
VMID
Input
C
R
Fc = high pass 3dB cut-off frequency
Fc =
1
2 RC
p
Figure 87 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 87 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 145.
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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