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WM8753LGEF Datasheet(PDF) 9 Page - Wolfson Microelectronics plc |
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WM8753LGEF Datasheet(HTML) 9 Page - Wolfson Microelectronics plc |
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9 / 87 page  WM8753L Advanced Information w AI Rev 3.1 June 2004 9 Test Conditions DCVDD = 1.5V, AVDD = HPVDD = DBVDD = SPKRVDD = PLLVDD = 3.3V, TA = +25 oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Microphone Bias Bias Voltage (MBVSEL=0) VMICBIAS -3% 0.9*AVDD +3*% V Bias Voltage (MBVSEL=1) VMICBIAS -3% 0.75*AVDD +3*% V Bias Current Source IMICBIAS 3 mA Output Noise Voltage Vn 1K to 20kHz 15 nV/ √Hz Digital Input / Output (excluding GPIO4) Input HIGH Level VIH 0.7 ×DBVDD V Input LOW Level VIL 0.3 ×DBVDD V Output HIGH Level VOH IOL=1mA 0.9 ×DBVDD V Output LOW Level VOL IOH-1mA 0.1 ×DBVDD V GPIO4 Input Input HIGH Level VIH 1.4 V Input LOW Level VIL 0.8 V TERMINOLOGY 1. Hold Time is the length of time between a signal detected being too quiet and beginning to ramp up the gain. It does not apply to ramping down the gain when the signal is too loud, which happens without a delay. 2. Ramp-up and Ramp-Down times are defined as the time it takes for the PGA to sweep across 90% of its gain range. 3. All hold, ramp-up and ramp-down times scale proportionally with MCLK 4. 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). 5. 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). 6. THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal. 7. 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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