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DS1886 Datasheet(PDF) 19 Page - Maxim Integrated Products |
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DS1886 Datasheet(HTML) 19 Page - Maxim Integrated Products |
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19 / 92 page  ���������������������������������������������������������������� Maxim Integrated Products 19 DS1886 SFP and PON ONU Controller with Digital LDD Interface Detailed Description The DS1886 integrates the control and monitoring func- tionality required to implement an SFP or PON ONU system using the Maxim MAX3710 or other compatible laser driver and limiting amplifier. Key components of the DS1886 are shown in the Block Diagram and described in subsequent sections. Monitors and Fault Detection Monitors The DS1886 monitors five ADC channels. This monitoring combined with the alarm enables (A2h Table 01h/05h) determines when/if the DS1886 turns off the MAX3710 DACs and triggers the TXFOUT and TXDOUT outputs. All the monitoring levels and interrupt masks are user- programmable. See Figure 1a. Table 1. Acronyms Figure 1a. ADC Channel Only for TXP when BURST_MODE = 1 in Table 02h, Register 89h Figure 1b. ADC Channel ACRONYM DESCRIPTION ADC Analog-to-Digital Converter APC Automatic Power Control APD Avalanche Photodiode DAC Digital-to-Analog Converter LOS Loss of Signal LUT LUT NV Nonvolatile QT Quick Trip ROSA Receiver Optical Subassembly SEE Shadowed EEPROM ACRONYM DESCRIPTION SFF Small Form Factor SFF-8472 Document Defining Register Map of SFPs and SFFs SFP Small Form-Factor Pluggable SFP+ Enhanced SFP TE Tracking Error. Deviation from linear of the relationship between transmitted power and monitor diode current. TIA Transimpedance Amplifier TOSA Transmit Optical Subassembly TXP Transmit Power 16 16 OFFSET REGISTERS 16 16 RIGHT-SHIFT2 DETERMINED BY KRMD COMPARE (MD0REGH[7:0] + 8 x MD1REGH[7:0]) 65,536 TXP SCALE TXFINT SHIFT ALARM AND WARNING THRESHOLDS RESULTS REGISTERS ALARM/ WARNING FLAGS ALARM/ WARNING ENABLES COUPLED* SHIFT RIGHT-SHIFT1 DETERMINED BY KIMD (A) *USER HAS TO CALIBRATE THE GAIN USING THE SCALE REGISTERS IN CASE RIGHT-SHIFTING IS DESIRED IN ORDER TO MAINTAIN CORRECT BIT WEIGHTING. x TXP = ADC 13 OFFSET REGISTERS SCALE REGISTERS 13 13 RIGHT-SHIFT SETTINGS COMPARE ANALOG INPUT TXFINT SHIFT ALARM AND WARNING THRESHOLDS ALARM/ WARNING FLAGS ALARM/ WARNING ENABLES COUPLED* *USER HAS TO CALIBRATE THE GAIN USING THE SCALE REGISTERS IN CASE RIGHT-SHIFTING IS DESIRED IN ORDER TO MAINTAIN CORRECT BIT WEIGHTING. (B) 13 RESULTS REGISTERS |
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