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WM8740 Datasheet(PDF) 7 Page - Wolfson Microelectronics plc |
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WM8740 Datasheet(HTML) 7 Page - Wolfson Microelectronics plc |
7 / 27 page WM8740 Production Data w PD, Rev 4.4, April 2010 7 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 Analogue Output Levels Output level differential Into 10k Ω, full scale 0dB, (5V supply) 2 VRMS Into 10k Ω, full scale 0dB, (3.3V supply) 1.32 VRMS Minimum resistance load To midrail or AC coupled (5V supply) 1 k Ω To midrail or AC coupled (3.3V supply) 600 Ω Maximum capacitance load 5V or 3.3V 100 pF Output DC level AVDD/2 V Reference Levels Potential divider resistance AVDD to VMIDL/VMIDR and VMIDL/VMIDR to AGND 10 k Ω Voltage at VMIDL/VMIDR AVDD/2 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 over a 20Hz to 20kHz bandwidth. 2. All performance measurements done with 20kHz low pass 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. BCKIN DIN LRCIN t BCH t BCL t BL t LB t BCY t DS t DH Figure 1 Audio Data Input Timing 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 Audio Data Input Timing Information BCKIN pulse cycle time tBCY 100 ns BCKIN pulse width high tBCH 40 ns BCKIN pulse width low tBCL 40 ns BCKIN rising edge to LRCIN edge tBL 20 ns LRCIN rising edge to BCKIN rising edge tLB 20 ns DIN setup time tDS 20 ns DIN hold time tDH 20 ns |
Similar Part No. - WM8740_10 |
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Similar Description - WM8740_10 |
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