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WM8720 Datasheet(PDF) 5 Page - Wolfson Microelectronics plc |
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WM8720 Datasheet(HTML) 5 Page - Wolfson Microelectronics plc |
5 / 17 page WM8720 Production Data w PD Rev 4.0. February 2005 5 ELECTRICAL CHARACTERISTICS Test Conditions AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25 oC, fs = 48kHz, SCKI = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT DAC Circuit Specifications SNR (Note 1) AVDD, DVDD = 5V 95 101 dB AVDD, DVDD = 3.3V 100 dB THD 0dB FS -96 -85 dB Dynamic range THD+N @ -60dB FS 95 101 dB Passband ±0.25dB 0.4535 fs Stopband -3dB 0.491 fs Pass band ripple ±0.25 dB Out of band rejection -40 dB Channel Separation 98 dB Gain mismatch channel-to-channel 0dB FS ±0.5 ±5 %FSR Digital Logic Levels Input LOW level VIL 0.8 V Input HIGH level VIH 2.0 V Output LOW level VOL IOL = 2mA AVSS + 0.3V Output HIGH level VOH IOH = 2mA AVDD - 0.3V Analogue Output Levels Output level Into 10k Ω, full scale 0dB, (5V supply) 1.1 VRMS Into 10k Ω, full scale 0dB, (3.3V supply) 0.72 VRMS To midrail or AC coupled (5V supply) 1 k Ω Minimum resistance load To midrail or AC coupled (3.3V supply) 1 k Ω Maximum capacitance load 5V or 3.3V 100 pF Output DC level AVDD/2 V Reference Levels Potential divider resistance AVDD to CAP and CAP to AGND 90 k Ω Voltage at CAP AVDD/2 POR POR threshold 2.0 V 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. 2. Dynamic range (dB) (DNR) 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. (eg THD+N @ -60dB= -32dB, DR= 92dB). 3. THD+N (dB) is a ratio of the r.m.s. 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) 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. |
Similar Part No. - WM8720_05 |
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Similar Description - WM8720_05 |
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