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ST75C540 数据表(PDF) 11 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 11 Page - STMicroelectronics |
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11 / 84 page  IV.4 - Modem Analog Interface AVDD =DVDD =5V, Tamb =25 oC Measurement bandwidth is flat from 100Hz to 4800Hz ;Load impedance 10k Ω, 20pF For differential output (TxA1/TxA2) : 0dBr = 1.77VRMS 1kHz sinwave (equivalent to 5VPP). For single input (RxA) : 0dBr = 886mVRMS 1kHz sinwave (equivalent to 2.5VPP). Symbol Pin Name Parameter Min. Typ. Max. Unit Rxrin RxA Input Impedance 100 k Ω Rxmac Maximum AC Input Voltage = 0dBr 2.5 VPP Rxdc DC Reference Voltage 2.5 V Rxsndr Signal to (Noise + Distortion), at -6dBr 75 dB Rxin Idle Noise -81 dBr Rxov DC Offset Voltage (Input = VCM) -50 100 mV TxAdrl TxA1/TxA2 Minimum Differential Load 10 k Ω TxAcl Maximum Differential Load 20 pF TxArout Output Impedance 100 Ω TxAmac Maximum AC Differential Output = 0dBr 5 VPP TxAdc DC Reference Voltage 2.5 V TxAov DC Offset Voltage -200 200 mV TxAsndr Signal to (Noise + Distortion), at -6dBr 79 dB TxAin Idle Noise -85 dBr IV.5 - Audio Analog Interface AVDD =DVDD =5V, Tamb =25 oC Measurement bandwidth is flat from 100Hz to 4800Hz ;Load impedance 10k Ω, 20pF For differential output (SPK1N/SPK1P, SPK2N/SPK2P, SPK3N/SPK3P) : 0dBr = 1.77VRMS 1kHz sinwave (equivalent to 5VPP). For single input (MIC1, MIC2, MIC3) : 0dBr = 886mVRMS 1kHz sinwave (equivalent to 2.5VPP). Symbol Pin Name Parameter Min. Typ. Max. Unit RArin MIC1, MIC2, MIC3 Input Impedance 100 k Ω RAmac Maximum AC Input Voltage = 0dBr 2.5 VPP RAdc DC Reference Voltage 2.5 V RAdis Distortion at -6dBr 2 % RAin Idle Noise -81 dBr RAov DC Offset Voltage (Input = VCM) -50 50 mV TAdrl SPK1N/SPK1P, SPK2N/SPK2P, SPK3N/SPK3P Minimum Differential Load 10 k Ω TArout Output Impedance 100 Ω TAmac Maximum AC Differential Output = 0dBr 5 VPP TAdc DC Reference Voltage 2.5 V TAov DC Offset Voltage -200 200 mV TAdis Distortion at -6dBr 1 % TAin Idle Noise -81 dBr IV - ELECTRICAL SPECIFICATIONS (continued) ST75C530 - ST75C540 11/84 |
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