wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 23

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Production Data
DIGITAL FILTER CHARACTERISTICS
TERMINOLOGY
1.
2.
w
Digital Microphone (DMIC) Filter
Passband
Passband Ripple
Stopband
Stopband Attenuation
DAC Normal Filter
Passband
Passband Ripple
Stopband
Stopband Attenuation
DAC Sloping Stopband Filter
Passband
Passband Ripple
Stopband 1
Stopband 1 Attenuation
Stopband 2
Stopband 2 Attenuation
Stopband 3
Stopband 3 Attenuation
Mode
Normal
Sloping Stopband
Stop Band Attenuation (dB) – the degree to which the frequency spectrum is attenuated (outside audio band)
Pass-band Ripple – any variation of the frequency response in the pass-band region
PARAMETER
DAC FILTERS
Group Delay
16.5 / fs
18 / fs
TEST CONDITIONS
f > 0.546 fs
f > 0.546 fs
f > 0.546 fs
+/- 0.05dB
+/- 0.05dB
+/- 0.03dB
F > 1.4 fs
f > 0.7 fs
0.454 fs
+/- 1dB
0.25 fs
-6dB
-6dB
-6dB
Mode
Normal
0.546 fs
0.546 fs
0.546 fs
0.25 fs
0.7 fs
1.4 fs
MIN
DMIC FILTERS
-60
-50
-60
-85
-55
0
0
0
0.5 fs
0.5 fs
0.5 fs
TYP
Group Delay
16.5 / fs
0.454 fs
0.454 fs
0.454 fs
+/- 0.05
+/- 0.03
+/- 0.03
0.25 fs
0.7 fs
1.4 fs
MAX
PD, Rev 4.0, September 2010
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
WM8918
23