wm9090 Wolfson Microelectronics plc, wm9090 Datasheet - Page 10

• Manufacturer Part Number: wm9090
• Description: Ultra Low Power Audio Subsystem
• Manufacturer: Wolfson Microelectronics plc

WM9090
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TERMINOLOGY
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Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the maximum 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.
Crosstalk (L/R) (dB) – left-to-right and right-to-left channel crosstalk is the measured signal level in the idle channel at
the test signal frequency relative to the signal level at the output of the active channel. The active channel is
configured and supplied with an appropriate input signal to drive a full scale output, with signal measured at the
output of the associated idle channel.
Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with
mute applied.
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.
PP, January 2010, Rev 3.0
Pre-Production
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