Datenblatt-Suchmaschine für elektronische Bauteile |
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CXA3791EN Datenblatt(PDF) 6 Page - Sony Corporation |
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CXA3791EN Datenblatt(HTML) 6 Page - Sony Corporation |
6 / 13 page CXA3791EN - 6 - Description of Operation Current Settings 1. Output Drive Current The small signal output impedance of the OUT pin (Pin 3) can be set by connecting the IDRV pin (Pin 4) to VCC through a resistor. The inflow current to the IDRV pin is multiplied by 10 times inside the IC, and flows as the output stage idling current. The IDRV pin has an internal 50k Ω resistor, so the inflow current to the IDRV pin can be calculated as follows. IIDRV = (VCC – VBE × 2)/(RIDRV + 50kΩ) = (13 – 1.46)/(180k Ω + 50kΩ) = 50.2 μA Here, VCC = 13V, VBE = 0.73V (typ.), and RIDRV = 180k Ω. The small signal output impedance at this time can be calculated as follows. ROUT = (26mV/(10 × IIDRV))/2 = (26mV/502 μA)/2 = 26 Ω 2. Sink Current for CCD with open source output The sink current of the IN pin (Pin 6) can be set by connecting the ISF pin (Pin 1) to VCC through a resistor. This sink current can be used as the CCD output stage source follower drive current. The inflow current to the ISF pin is multiplied by 58 times inside the IC, and flows as the sink current. The ISF pin has an internal 50k Ω resistor, so the inflow current to the ISF pin can be calculated as follows. IISF = (VCC – VBE × 2)/(RISF + 50kΩ) = (13 – 1.46)/(180k Ω + 50kΩ) = 50.2 μA Here, VCC = 13V, VBE = 0.73V (typ.), and RISF = 180k Ω. The sink current at this time can be calculated as follows. Isink = 58 × IISF = 2.9mA Note) This IC operation depends on IDRV and ISF. Set the external resistance so that IDRV and ISF current are 90 μA or less, referring to the table shown below. [IDRV and ISF vs. external resistor] Current ( μA) 90 68 50 35 26 Unit When VCC = 15V 100 150 220 330 470 k Ω When VCC = 13V 78 120 180 270 390 k Ω |
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