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WM8711 Datasheet(PDF) 8 Page - Wolfson Microelectronics plc |
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WM8711 Datasheet(HTML) 8 Page - Wolfson Microelectronics plc |
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8 / 47 page  Production Data WM8711 / WM8711L w PD Rev 4.3 September 2006 8 Test Conditions AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25 oC, Slave Mode, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Stereo Headphone Output 0dB Full scale output voltage 1.0 x AVDD/3.3 Vrms RL = 32 Ω 30 Max Output Power PO RL = 16 Ω 55 mW Signal to Noise Ratio (Note 1,2) SNR A-weighted 90 98 dB 1kHz, RL = 32 Ω, PO = 10mW rms 0.056 -65 0.1 -60 Total Harmonic Distortion THD 1kHz, RL = 32 Ω, PO = 20mW rms 0.56 -45 1.0 -40 % dB 1kHz 100mVpp 50 Power Supply Rejection Ratio PSRR 20Hz to 20kHz 100mVpp 45 dB Programmable Gain 1kHz -73 6 6 dB Programmable Gain Step Size 1kHz 1 dB Mute attenuation 1kHz, 0dB 80 dB Notes: 1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’ weighted over a 20Hz to 20kHz bandwidth. 2. All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use such a filter will result in higher THD+N 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. 3. VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance). TERMINOLOGY 1. Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output with no signal applied. (No Auto-zero or Automute function is employed in achieving these results). 2. Dynamic range (dB) - DR is a measure of the difference between the highest and lowest portions of a signal. Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB). 3. THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal. 4. Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band). 5. 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. 6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region. |
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