WM8734SEFL Wolfson Microelectronics, WM8734SEFL Datasheet - Page 38

• Manufacturer Part Number: WM8734SEFL
• Description: Audio CODECs Stereo CODEC
• Manufacturer: Wolfson Microelectronics

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

WM8734
DIGITAL FILTER CHARACTERISTICS
Table 22 Digital Filter Characteristics
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ADC Filter Type 0 (USB Mode, 250fs operation)
Passband
Passband Ripple
Stopband
Stopband Attenuation
ADC Filter Type 1 (USB mode, 272fs or Normal mode operation)
Passband
Passband Ripple
Stopband
Stopband Attenuation
High Pass Filter Corner
Frequency
DAC Filter Type 0 (USB mode, 250fs operation)
Passband
Passband Ripple
Stopband
Stopband Attenuation
DAC Filter Type 1 (USB mode, 272fs or Normal mode operation)
Passband
Passband Ripple
Stopband
Stopband Attenuation
PARAMETER
Table 21 Register Map Description
Note:
Unused register bits should be set to ‘0’ except when writing to Register 0000110, when bits 1,5 and
6 should be set to ‘1’.
The ADC and DAC employ different digital filters. There are 4 types of digital filter, called Type 0, 1, 2
and 3. The performance of Types 0 and 1 is listed in the table below, the responses of all filters is
shown in the proceeding pages.
0001000
Sampling
Control
0001001
Active Control
REGISTER
ADDRESS
TEST CONDITIONS
f > 0.5465fs
f > 0.5465fs
f > 0.584fs
f > 0.584fs
+/- 0.05dB
+/- 0.05dB
+/- 0.03dB
+/- 0.03dB
-0.5dB
-0.1dB
-6dB
-6dB
-3dB
-6dB
-6dB
0
1
5:2
6
0
BIT
USB/
NORMAL
BOSR
SR[3:0]
CLKIDIV2
ACTIVE
LABEL
0.5465fs
0.5465fs
0.584fs
0.584fs
MIN
-60
-60
-50
-50
0
0
0
0
0
0
0000
0
0
DEFAULT
0.5fs
0.5fs
0.5fs
0.5fs
10.4
21.6
TYP
3.7
Mode Select
1 = USB mode (250/272fs)
0 = Normal mode (256/384fs)
Base Over-Sampling Rate
0 = 256fs
1 = 384fs
ADC and DAC sample rate control
Core Clock divider select
1 = Core Clock is MCLK divided by 2
0 = Core Clock is MCLK
Activate Interface
1 = Active
0 = Inactive
0.4535fs
0.4535fs
+/- 0.05
+/- 0.05
+/- 0.03
0.416fs
0.416fs
+/-0.03
MAX
DESCRIPTION
PD, Rev 4.3, January 2009
UNIT
dB
dB
dB
dB
dB
dB
dB
Hz
dB
Production Data
38