wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 7

• 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

Pre-Production
ELECTRICAL CHARACTERISTICS
COMMON TEST CONDITIONS
Unless otherwise stated, the following test conditions apply throughout the following sections:
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•
•
•
•
•
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Additional, specific test conditions are given within the relevant sections below.
AUDIO DAC
TERMINOLOGY
1.
2.
3.
4.
5.
DAC TO SPEAKER OUTPUT
w
PARAMETER
DAC to Speaker Output (4.1Ω + 22μH BTL Load)
SNR (A-weighted)
THD+N (P
THD+N (P
THD+N (P
SNR (A-weighted)
THD+N (P
THD+N (P
THD+N (P
DCVDD = DBVDD = 1.8V, AVDD = 3.3V, SPKVDD = 5.0V
PGA gain = 0dB
ACGAIN=DCGAIN=1.52
Audio signal: 1kHz sine wave, sampled at 48kHz with 24-bit data resolution, I
Ambient temperature: T
C
VMID_SEL[1:0] = 01 (2x40kΩ)
Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the maximum theoretical full scale
output signal and the output with no input signal applied.
Total Harmonic Distortion (dB) – THD is the level of the rms value of the sum of harmonic distortion products relative
to the amplitude of the measured output signal.
Total Harmonic Distortion plus Noise (dB) – THD+N is the level of the rms value of the sum of harmonic distortion
products plus noise in the specified bandwidth relative to the amplitude of the measured output signal.
All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. Failure to
use such a filter will result in higher THD and lower SNR readings than are found in the Electrical Characteristics. The
low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with
mute applied.
VMID
= 4.7μF
O
O
O
O
O
O
=0.5W)
=1.0W)
=2.0W)
=0.5W)
=1.0W)
=2.0W)
A
= +25°C
DAC to speaker output, class AB
DAC to speaker output, class D
TEST CONDITIONS
2
S mode
MIN
85
90
TYP
-72
-72
-68
-86
-86
-80
92
97
PP, Rev 3.0, April 2009
MAX
-50
-50
WM9081
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
7