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WM8772EFT/R Datasheet(PDF) 11 Page - Wolfson Microelectronics plc |
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WM8772EFT/R Datasheet(HTML) 11 Page - Wolfson Microelectronics plc |
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11 / 70 page  Production Data WM8772 w PD Rev 4.1 October 2004 11 Test Conditions AVDD, VREFP = 5V, DVDD = 3.3V, AGND, VREFN = 0V, DGND = 0V, TA = +25 oC, fs = 48kHz, MCLK = 256fs, 32-pin TQFP version unless otherwise stated. ADC/DAC in Slave Mode unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT ADC Performance Input Signal Level (0dB) 2.0 x REFADC/5 Vrms Input resistance 20 kΩ Input capacitance 10 pF SNR (Note 1,2,4) A-weighted, 0dB gain @ fs = 48kHz 80 100 dB SNR (Note 1,2,4) A-weighted, 0dB gain @ fs = 96kHz 64 x OSR 100 dB SNR (Note 1,2,4) A-weighted, 0dB gain @ fs = 48kHz, AVDD = 3.3V 93 dB SNR (Note 1,2,4) A-weighted, 0dB gain @ fs = 96kHz, AVDD = 3.3V 64 x OSR 93 dB kHz, 0dBFs -80 dB Total Harmonic Distortion (THD) 1kHz, -1dBFs -82 dB ADC Channel Separation 1kHz Input 90 dB Mute Attenuation 1kHz Input, 0dB gain 90 dB 1kHz 100mVpp 50 dB Power Supply Rejection Ratio PSRR 20Hz to 20kHz 100mVpp 45 dB Digital Logic Levels (CMOS Levels) Input LOW level VIL 0.3 x DVDD V Input HIGH level VIH 0.7 x DVDD V Input leakage current ±0.2 ±1 µA Input capacitance 5 pF Output LOW VOL IOL=1mA 0.1 x DVDD V Output HIGH VOH IOH= -1mA 0.9 x DVDD V Analogue Reference Levels Reference voltage VVMID VREFP/2 – 50mV VREFP/2 VREFP/2 + 50mV V Potential divider resistance RVMID VREFP to VMID and VMID to VREFN 50 kΩ Supply Current Analogue supply current AVDD, VREFP = 5V 45 mA Digital supply current DVDD = 3.3V 16 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). |
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