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WM8918 Datasheet(PDF) 10 Page - Cirrus Logic |
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WM8918 Datasheet(HTML) 10 Page - Cirrus Logic |
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10 / 176 page  WM8918 Production Data w PD, Rev 4.1, January 2012 10 ELECTRICAL CHARACTERISTICS TERMINOLOGY 1. Signal-to-Noise Ratio (dB) – SNR is the difference in level between a full scale output signal and the device output noise with no signal applied, measured over a bandwidth of 20Hz to 20kHz. This ratio is also called idle channel noise. (No Auto-zero or Automute function is employed). 2. Total Harmonic Distortion (dB) – THD is the difference in level between a 1kHz full scale sinewave output signal and the first seven harmonics of the output signal. The amplitude of the fundamental frequency of the output signal is compared to the RMS value of the next seven harmonics and expressed as a ratio. 3. Total Harmonic Distortion + Noise (dB) – THD+N is the difference in level between a 1kHz full scale sine wave output signal and all noise and distortion products in the audio band. The amplitude of the fundamental reference frequency of the output signal is compared to the RMS value of all other noise and distortion products and expressed as a ratio. 4. Channel Separation (dB) – is a measure of the coupling between left and right channels. A full scale signal is applied to the left channel only, the right channel amplitude is measured. Then a full scale signal is applied to the right channel only and the left channel amplitude is measured. The worst case channel separation is quoted as a ratio. 5. Channel Level Matching (dB) – measures the difference in gain between the left and the right channels. 6. Power Supply Rejection Ratio (dB) – PSRR is a measure of ripple attenuation between the power supply pin and an output path. With the signal path idle, a small signal sine wave is summed onto the power supply rail, The amplitude of the sine wave is measured at the output port and expressed as a ratio. 7. All performance measurements carried out with 20kHz AES17 low pass filter for distortion measurements, and an A-weighted filter for noise measurement. Failure to use such a filter will result in higher THD and lower SNR and Dynamic Range 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. COMMON TEST CONDITIONS Unless otherwise stated, the following test conditions apply throughout the following sections: DCVDD = 1.0V DBVDD = 1.8V AVDD = CPVDD =1.8V Ambient temperature = +25°C Audio signal: 1kHz sine wave, sampled at 48kHz with 24-bit data resolution SYSCLK_SRC = 0 (system clock comes direct from MCLK, not from FLL). Additional, specific test conditions are given within the relevant sections below. |
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