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WM8774 Datasheet(PDF) 7 Page - Wolfson Microelectronics plc |
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WM8774 Datasheet(HTML) 7 Page - Wolfson Microelectronics plc |
7 / 42 page Product Preview WM8774 PP Rev 1.0 June 2002 7 Test Conditions AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25 oC, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT ADC Channel Separation 1kHz Input 90 dB Programmable Gain Step Size 0.5 1.0 1.5 dB Programmable Gain Range 1kHz Input -12 +19 dB Mute Attenuation 1kHz Input, 0dB gain 97 dB 1kHz 100mVpp 50 dB Power Supply Rejection Ratio PSRR 20Hz to 20kHz 100mVpp 45 dB Analogue input (AIN) to Analogue output (VOUT) (Load=10k ohms, 50pF, gain = 0dB) Bypass Mode 0dB Full scale output voltage 1.0 x AVDD/5 Vrms SNR (Note 1) 90 100 dB 1kHz, 0dB -90 dB THD 1kHz, -3dB -95 dB 1kHz 100mVpp 50 dB Power Supply Rejection Ratio PSRR 20Hz to 20kHz 100mVpp 45 dB Mute Attenuation 1kHz, 0dB 100 dB Supply Current Analogue supply current AVDD = 5V 100 mA Digital supply current DVDD = 3.3V 20 mA 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. 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) - 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. (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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