WM8734SEFL Wolfson Microelectronics, WM8734SEFL Datasheet - Page 40
WM8734SEFL
Manufacturer Part Number
WM8734SEFL
Description
Audio CODECs Stereo CODEC
Manufacturer
Wolfson Microelectronics
Datasheet
1.WM8734SEFL.pdf
(46 pages)
Specifications of WM8734SEFL
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
QFN-28
Minimum Operating Temperature
- 25 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
WM8734SEFL/R
Manufacturer:
ON
Quantity:
3 000
Part Number:
WM8734SEFL/R
Manufacturer:
WOLFSON
Quantity:
20 000
WM8734
Figure 31 ADC Digital Filter Frequency Response –Type 2
ADC HIGH PASS FILTER
DIGITAL DE-EMPHASIS CHARACTERISTICS
Figure 33 De-Emphasis Frequency Response (32kHz)
Figure 35 De-Emphasis Frequency Response (44.1kHz)
w
-100
-20
-40
-60
-80
-10
-10
-2
-4
-6
-8
-2
-4
-6
-8
0
0
0
0
0
0
2000
0.5
5000
4000
1
6000
Frequency (Fs)
Frequency (Fs)
Frequency (Fs)
The WM8734 has a selectable digital high pass filter to remove DC offsets. The filter response is
characterised by the following polynomial.
10000
H(z) =
8000
1.5
10000
1 – 0.9995 z
15000
2
1 – z
12000
-1
2.5
14000
-1
20000
16000
3
Figure 32 ADC Digital Filter Ripple –Type 2
Figure 34 De-Emphasis Error (32kHz)
Figure 36 De-Emphasis Error (44.1kHz)
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
0.02
0.01
-0.1
-0.2
-0.3
-0.4
-0.1
-0.2
-0.3
-0.4
0.4
0.3
0.2
0.1
0.4
0.3
0.2
0.1
0
0
0
0
0
0
2000
0.05
5000
4000
6000
0.1
Frequency (Fs)
Frequency (Fs)
Frequency (Fs)
10000
8000
0.15
PD, Rev 4.3, January 2009
10000
15000
12000
0.2
Production Data
14000
20000
16000
0.25
40