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SI3233 데이터시트(PDF) 7 Page - Silicon Laboratories |
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SI3233 데이터시트(HTML) 7 Page - Silicon Laboratories |
7 / 100 page Si3233 Preliminary Rev. 0.5 7 Table 4. Linefeed Characteristics (VDDA, VDDD = 3.13 to 5.25 V, TA = 0 to 70°C for F-Grade, –40 to 85°C for G-Grade) Parameter Symbol Test Condition Min Typ Max Unit Loop Resistance Range RLOOP See note.* 0 — 160 Ω DC Loop Current Accuracy ILIM = 29 mA, ETBA = 4 mA –10 — 10 % DC Open Circuit Voltage Accuracy Active Mode; VOC = 48 V, VTIP – VRING –4 — 4 V DC Differential Output Resistance RDO ILOOP < ILIM —160 — Ω DC Open Circuit Voltage— Ground Start VOCTO IRING<ILIM; VRING wrt ground VOC = 48 V –4 — 4 V DC Output Resistance— Ground Start RROTO IRING<ILIM; RING to ground — 160 — Ω DC Output Resistance— Ground Start RTOTO TIP to ground 150 — — k Ω Loop Closure/Ring Ground Detect Threshold Accuracy ITHR = 11.43 mA –20 — 20 % Ring Trip Threshold Accuracy ITHR = 40.64 mA –10 — 10 % Ring Trip Response Time User Programmable Register 70 and Indirect Register 23 ——— Ring Amplitude VTR 5 REN load; sine wave; RLOOP = 160 Ω, VBAT = –75 V 44 — — Vrms Ring DC Offset ROS Programmable in Indirect Register 6 0— — V Trapezoidal Ring Crest Factor Accuracy Crest factor = 1.3 –.05 — .05 Sinusoidal Ring Crest Factor RCF 1.35 — 1.45 Ringing Frequency Accuracy f = 20 Hz –1 — 1 % Ringing Cadence Accuracy Accuracy of ON/OFF Times –50 — 50 ms Calibration Time ↑CAL to ↓CAL Bit — — 600 ms Power Alarm Threshold Accuracy At Power Threshold = 300 mW –25 — 25 % *Note: DC resistance round trip; 160 Ω corresponds to 2 kft 26 gauge AWG. |
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