WM8711 Wolfson Microelectronics Ltd., WM8711 Datasheet - Page 31

• Manufacturer Part Number: WM8711
• Description: Internet Audio DAC With Integrated Headphone Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8711
WOLFSON MICROELECTRONICS LTD
Table 22 Register Map Description
Note:
All other bits not explicitly defined in the register table should be set to zero unless specified
otherwise (see powerdown section).
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 23 Digital Filter Characteristics
0001001
Active Control
0001111
Reset Register
1110000
Test Failsafe
1110001
Analogue Test
Register 1
1110010
Analogue Test
Register 2
11100011
Digital Test
Register 1
11100100
Digital Test
Register 2
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
8:0
0
8:0
8:0
8:0
8:0
BIT
ACTIVE
RESET
TESTFAIL
SAFE
ATEST1[8:0]
ATEST2[8:0]
DTEST1[8:0]
DTEST2[8:0]
LABEL
TEST CONDITIONS
f > 0.5465fs
+/- 0.03dB
f > 0.584fs
+/- 0.03dB
-6dB
-6dB
0
not reset
0
0
0
0
0
DEFAULT
0.5465fs
0.584fs
Activate Interface
1 = Active
0 = Inactive
Reset Register
Writing 00000000 to register resets
device
Test Mode Failsafe Bit
1 = Test Mode Allowed
0 = Test Mode Locked Out
Analogue Test Register 1
Analogue Test Register 2
Digital Test Register 1
Digital Test Register 2
MIN
-50
-50
0
0
0.5fs
0.5fs
DESCRIPTION
TYP
PP Rev 1.2 November 2000
0.4535fs
+/- 0.03
0.416fs
+/-0.03
MAX
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UNIT
dB
dB
dB
dB
31