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WM8594 Datasheet(PDF) 9 Page - Wolfson Microelectronics plc |
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WM8594 Datasheet(HTML) 9 Page - Wolfson Microelectronics plc |
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9 / 78 page  Product Preview WM8594 w PP Rev 1.0 January 2007 9 Test Conditions AVDD2=9V, AVDD1=DVDD=3.3V, AGND1=AGND2=0V, DGND=0V, TA=+25˚C, 1kHz signal, fs=48kHz, MCLK=256fs unless otherwise stated PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Channel Separation 4,5 100 dB Channel Level Matching 0.1 dB Channel Phase Deviation 0.05 Degree Headphone Amplifier Output signal level (0dB) 0.8 Vrms Signal to Noise Ratio 1,5 SNR A-weighted dB PO=20mW, RL=16Ω dB Total Harmonic Distortion THD PO=20mW, RL=32Ω dB Channel Separation 4,5 dB Power Supply Rejection Ratio PSRR TBD dB Digital Volume Control ADC minimum digital volume -97 dB ADC maximum digital volume +30 dB ADC volume step size 0.5 dB DAC minimum digital volume -100 dB DAC maximum digital volume +12 dB DAC volume step size 0.5 dB Analogue Volume Control Minimum gain -73.5 dB Maximum gain +6 dB Step size 0.5 dB Mute attenuation TBD dB Crosstalk 1kHz signal, ADC fs=48kHz, DAC fs=44.1kHz 100 dB DAC to ADC 20kHz signal, ADC fs=48kHz, DAC fs=44.1kHz 100 dB 1kHz signal, ADC fs=48kHz, DAC fs=44.1kHz 100 dB ADC to DAC 20kHz signal, ADC fs=48kHz, DAC fs=44.1kHz 100 dB TERMINOLOGY 1. Signal-to-noise ratio (dBFS) – SNR is the difference in level between a reference full scale output signal and the device output with no signal applied. This ratio is also called idle channel noise. (No Auto-zero or Automute function is employed in achieving these results). 2. Dynamic range (dBFS) – DNR is a measure of the difference in level between the highest and lowest components of a signal. Normally a THD measurement at -60dBFS. The measured signal is then corrected by adding 60dB to the result, e.g. THD @ -60dBFS = -30dB, DNR = 90dB. 3. Total Harmonic Distortion (dBFS) – THD is the difference in level between a reference full scale output signal and the first seven odd harmonics of the output signal. To calculate the ratio, the fundamental frequency of the output signal is notched out and an RMS value of the next seven odd harmonics is calculated. 4. Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from the other. Normally measured by sending a full scale signal down one channel and measuring the other. |
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