WM8974GEFL/V Wolfson Microelectronics, WM8974GEFL/V Datasheet - Page 81

Audio CODECs Mono Codec with Spkr

WM8974GEFL/V

Manufacturer Part Number
WM8974GEFL/V
Description
Audio CODECs Mono Codec with Spkr
Manufacturer
Wolfson Microelectronics
Datasheet

Specifications of WM8974GEFL/V

Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
QFN-24
Minimum Operating Temperature
- 25 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Production Data
Figure 52 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 54 EQ Band 2 – EQ2BW=0, EQ2BW=1
w
5-BAND EQUALISER
Figure 50 EQ Band 1 – Low Frequency Shelf Filter Cut-offs Figure 51 EQ Band 1 – Gains for Lowest Cut-off Frequency
-10
-15
-10
-15
-10
-15
15
10
15
10
15
10
-5
-5
-5
10
10
5
0
5
0
5
0
10
-1
-1
-2
10
10
10
-1
0
0
10
10
10
1
1
0
Frequency (Hz)
Frequency (Hz)
Frequency (Hz)
10
10
10
The WM8974 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.
The plots from Figure 50 to Figure 63 show the frequency responses of each filter with a sampling
frequency of 48kHz, firstly showing the different cut-off/centre frequencies with a gain of ±12dB, and
secondly a sweep of the gain from -12dB to +12dB for the lowest cut-off/centre frequency of each
filter.
2
2
1
10
10
10
3
3
2
10
10
10
4
4
3
10
10
10
5
5
4
Frequency, EQ2BW=0
Figure 53 EQ Band 2 – Peak Filter Gains for Lowest Cut-off
-10
-15
-10
-15
15
10
15
10
-5
-5
10
10
5
0
5
0
-1
-1
10
10
0
0
10
10
1
1
Frequency (Hz)
Frequency (Hz)
10
10
2
2
PD, Rev 4.5, September 2008
10
10
3
3
10
10
4
4
WM8974
10
10
5
5
81

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