WM8711BL Wolfson Microelectronics, WM8711BL Datasheet - Page 37

• Manufacturer Part Number: WM8711BL
• Description: Ultra-Small Audio DAC
• Manufacturer: Wolfson Microelectronics

Production Data
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Table 23 Register Map Description
Note:
All other bits not explicitly defined in the register table should be set to zero unless specified
otherwise.
DIGITAL FILTER CHARACTERISTICS
The 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.
Table 24 Digital Filter Characteristics
0001000
Sampling
Control
0001001
Active Control
0001111
Reset Register
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
REGISTER
ADDRESS
PARAMETER
0
1
5:2
6
7
0
8:0
BIT
USB/
NORMAL
BOSR
SR[3:0]
CLKIDIV2
CLKODIV2
ACTIVE
RESET
LABEL
TEST CONDITIONS
f > 0.5465fs
f > 0.584fs
+/- 0.03dB
+/- 0.03dB
-6dB
-6dB
0
0
0000
0
0
0
not reset
DEFAULT
0.5465fs
0.584fs
Mode Select
1 = USB mode (250/272fs)
0 = Normal mode (256/384fs)
Base Over-Sampling Rate
USB Mode
0 = 250fs
1 = 272fs
DAC sample rate
control;
See USB Mode
and Normal
Mode Sample
Rate sections for
operation
Core Clock divider select
1 = Core Clock is MCLK divide by 2
0 = Core Clock is MCLK
CLKOUT divider select
1 = CLOCKOUT is MCLK divide by 2
0 = CLOCKOUT is MCLK
Activate Interface
1 = Active
0 = Inactive
Reset Register
Writing 00000000 to register resets
device
MIN
-50
-50
0
0
0.5fs
0.5fs
TYP
DESCRIPTION
PD, Rev 4.1, April 2007
0.4535fs
+/- 0.03
Normal Mode
0 = 256fs
1 = 384fs
0.416fs
+/-0.03
MAX
WM8711BL
UNIT
dB
dB
dB
dB
37