wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 12

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
TYPICAL PERFORMANCE DATA
SPEAKER CLASS D INTO 4Ω + 10μH
SPEAKER CLASS D INTO 8Ω + 10μH
w
%
%
0.005
0.002
0.001
0.005
0.002
0.001
0.05
0.02
0.01
0.05
0.02
0.01
0.5
0.2
0.1
0.5
0.2
0.1
10
10
5
2
1
5
2
1
0
0
Sweep
1
2
3
4
Device: WM9081 MMC=WPF
Input Signal: 1KHz; 0dBFS; 24-bit; 256fs (fs=48kHz)
Output Path: SPK Class D
Supplies: DBVDD=DCVDD=3.3V
BW Filter: 22Hz to 20kHz AES17
Additional Filtering: none
Load = 4R1 + 10uH
Sweep
1
2
3
4
Device: WM9081 MMC=WPF
Input Signal: 1KHz; 0dBFS; 24-bit; 256fs (fs=48kHz)
Output Path: SPK Class D
Supplies: DBVDD=DCVDD=3.3V
BW Filter: 22Hz to 20kHz AES17
Additional Filtering: none
Load = 8R2 + 10uH
100m
100m
Typical speaker driver THD+N performance is shown below for both 8Ω and 4Ω loads in Class D mode. Curves are
shown for four typical SPKVDD supply voltage and gain combinations.
Trace
1
1
1
1
Trace
1
1
1
1
200m
200m
Color
Blue
Green
Magenta
Red
Color
Blue
Green
Magenta
Red
300m
300m
Line Style
Solid
Solid
Solid
Solid
Line Style
Solid
Solid
Solid
Solid
400m
400m
500m
500m
Thick
2
2
2
2
Thick
2
2
2
2
Data
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Data
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Anlr.THD+N Ratio
600m
600m
700m
700m
800m
800m
Axis
Left
Left
Left
Left
Axis
Left
Left
Left
Left
Comment
SPKVDD = 5.0V, AVDD = 3.3V, DCGAIN = ACGAIN = 3.6dB
SPKVDD = 4.2V, AVDD = 3.3V, DCGAIN = ACGAIN = 2.1dB
SPKVDD = 3.7V, AVDD = 3.0V, DCGAIN = ACGAIN = 2.1dB
SPKVDD = 3.3V, AVDD = 3.3V, DCGAIN = ACGAIN = 0dB
Comment
SPKVDD = 5.0V, AVDD = 3.3V, DCGAIN = ACGAIN = 3.6dB
SPKVDD = 4.2V, AVDD = 3.3V, DCGAIN = ACGAIN = 2.1dB
SPKVDD = 3.7V, AVDD = 3.0V, DCGAIN = ACGAIN = 2.1dB
SPKVDD = 3.3V, AVDD = 3.3V, DCGAIN = ACGAIN = 0dB
.9
.9
1
1
1.1
1.1
1.2
1.2
W
W
1.3
1.3
1.4
1.4
1.5
1.5
1.6
1.6
1.7
1.7
1.8
1.8
1.9
1.9
2
2
PP, Rev 3.0, April 2009
2.1
2.1
2.2
2.2
Pre-Production
2.3
2.3
2.4
2.4
2.5
2.5
12