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WM8731SEDS/V 数据表(PDF) 13 Page - Wolfson Microelectronics plc |
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WM8731SEDS/V 数据表(HTML) 13 Page - Wolfson Microelectronics plc |
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13 / 65 page  WM8731 / WM8731L Production Data w PD, Rev 4.9, October 2012 13 Test Conditions AVDD, HPVDD, DBVDD = 1.8V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25 oC, Slave Mode, fs = 48kHz, XTI/MCLK = 256fs unless otherwise stated. Stereo Headphone Output 0dB Full scale output voltage 1.0 x AVDD/3.3 Vrms Max Output Power PO RL = 32 Ω 9 mW RL = 16 Ω 18 Signal to Noise Ratio (Note 1,3) SNR A-weighted 86 95 dB Total Harmonic Distortion THD 1kHz, -5dB FS signal RL = 32Ω 0.08 -62 0.1 -60 % dB 1kHz, -2dB FS signal RL = 32Ω 1 -40 Power Supply Rejection Ratio PSRR 1kHz 100mVpp 50 dB 20Hz - 20kHz, 100mVpp 45 Programmable Gain 1kHz -73 0 6 dB Programmable Gain Step Size 1kHz 1 dB Mute attenuation 1kHz, 0dB 80 dB Microphone Input to Headphone Output Side Tone Mode 0dB Full scale output voltage 1.0 x AVDD/3.3 Vrms Signal to Noise Ratio (Note 1,3) SNR 85 90 dB Power Supply Rejection Ratio PSRR 1kHz 100mVpp 50 dB 20Hz to 20kHz 100mVpp 45 Programmable Attenuation 1kHz 6 15 dB Programmable Attenuation Step Size 1kHz 3 dB Mute attenuation 1kHz, 0dB 80 dB Notes: 1. Ratio of output level with 1kHz full scale input, to the output level with the input short circuited, measured ‘A’ weighted over a 20Hz to 20kHz bandwidth using an Audio analyser. 2. 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. 3. 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. 4. 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. 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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