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WM8904ECS/R 数据表(PDF) 19 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 19 Page - Wolfson Microelectronics plc |
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19 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 19 OTHER PARAMETERS VMID Reference PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Midrail Reference Voltage (VMIDC pin) -3% AVDD/2 +3% V Charge up time (from fully discharged to 10% below VMID) External capacitor 4.7 F 890 μs Microphone Bias (for analogue electret condenser microphones) Additional test conditions: MICBIAS_ENA=1, all parameters measured at the MICBIAS pin PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Bias Voltage. Note: 7/6 and 9/10 are available only if MICVDD > AVDD. Note: 3/2 and 4/3 are available only if MICVDD ≥ 2.5V. VMICBIAS MICVDD = 2.5V 3mA load current, MICBIAS_SEL = 1xx -10% 3/2 x AVDD +10% V MICBIAS_SEL = 011 -10% 4/3 x AVDD +10% MICBIAS_SEL = 010 -10% 7/6 x AVDD +10% MICBIAS_SEL = 001 -10% 10/9 x AVDD +10% MICBIAS_SEL = 000 -10% 9/10 ×AVDD +10% Drop out voltage between MICVDD and MICBIAS 200 mV Maximum source current IMICBIAS 4 mA Noise spectral density At 1kHz 19 nV/√Hz Power Supply Rejection Ratio MICVDD to MICBIAS PSRR 1kHz, 100mV pk-pk MICVDD = 1.71 V 67 dB 20kHz, 100mV pk-pk MICVDD = 1.71 V 76 1kHz, 100mV pk-pk MICVDD = 2.5 V 88 20kHz, 100mV pk-pk MICVDD = 2.5 V 84 1kHz, 100mV pk-pk MICVDD = 3.6 V 61 20kHz, 100mV pk-pk MICVDD = 3.6 V 70 Power Supply Rejection Ratio MICVDD and AVDD to MICBIAS PSRR 1kHz, 100mV pk-pk AVDD = MICVDD = 1.8 V 54 dB 20kHz, 100mV pk-pk AVDD = MICVDD = 1.8 V 79 MICBIAS Current Detect Function (See Note 1) Current Detect Threshold (Microphone insertion) MICDET_THR = 00 80 A Current Detect Threshold (Microphone removal) 60 Delay Time for Current Detect Interrupt tDET 3.2 ms MICBIAS Short Circuit (Hook Switch) Detect Function (See Note 1) Short Circuit Detect Threshold (Button press) MICSHORT_THR = 00 600 A Short Circuit Detect Threshold (Button release) 400 Minimum Delay Time for Short Circuit Detect Interrupt tSHORT 47 ms Note 1 : If AVDD 1.8, current threshold values should be multiplied by (AVDD/1.8) |
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