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DS1865 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1865 Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 66 page  PON Triplexer Control and Monitoring Circuit 8 _____________________________________________________________________ Pin Description PIN NAME FUNCTION 1 BEN Burst Enable Input. Triggers the sampling of the APC and quick-trip monitors. 2 TX-D Transmit Disable Input. Disables BIAS and MOD outputs. 3 TX-F Transmit Fault Output, Open Drain 4 FETG Output to FET Gate. Signals an external n- or p-channel MOSFET to enable/disable the laser’s current. 5, 19 VCC Supply Voltage 6, 18 GND Ground 7, 10, 11, 25 N.C. No Connection 8 SDA I2C Serial Data. Input/output for I2C data. 9 SCL I2C Serial Clock. Input for I2C clock. 12–15 MON1–MON4 External Monitor Input 1–4. The voltage at these pins are digitized by the internal analog-to-digital converter and can be read through the I2C interface. Alarm and warning values can be assigned to interrupt the processor based on the ADC result. 16 DAC1 17 M4DAC Digital-to-Analog Output DAC1 and M4DAC. Two 8-bit DAC outputs for generating analog voltages. Typically used to control the video photodiode bias. M4DAC is controlled by the input voltage on MON4 and Table 06h LUT. 20 BIAS Bias Current Output. This current DAC generates the bias current reference for the MAX3643. 21 MOD Modulation Output Voltage. This 8-bit voltage output has eight full-scale ranges from 1.25V to 0.3125V. This pin is connected to the MAX3643’s VMSET input to control the modulation current. 22 BMD Monitor Diode Input (Feedback Voltage, Transmit Power Monitor) 23 LOSI Loss-of-Signal Input. This input is accessible in the status register through the I2C interface. 24 D0 Digital I/O 0. This signal is either the open-drain output driver for LOSI, or can be controlled by the OUT0 bit (D0OUT). The logic level of this pin is indicated by the D0IN and LOS status bits. 26, 27, 28 D1, D2, D3 Digital I/O 1–3. These are bidirectional pins controlled by internally addressable bits. The outputs are open-drain. — EP Exposed Pad. This contact should be connected to GND. |
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