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ADN2848ACP-32 Datasheet(PDF) 7 Page - Analog Devices |
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ADN2848ACP-32 Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page REV. 0 ADN2848 –7– ADN2848 CLKN CLKP GND1 DATAP DATAN VCC1 PAVCAP ERCAP VCC2 IMODN GND2 IMODP GND2 GND2 IBIAS CCBIAS ALS FAIL DEGRADE CLKN CLKP DATAP DATAN 1.5k 18 24 17 25 32 16 9 VCC MPD LD VCC VCC VCC 10nF 10nF 10nF 10nF 10 F GND VCCs SHOULD HAVE BYPASS CAPACITORS AS CLOSE AS POSSIBLE TO THE ACTUAL SUPPLY PINS ON THE ADN2848 AND THE LASER DIODE USED. CONSERVATIVE DECOUPLING WOULD INCLUDE 100pF CAPACITORS IN PARALLEL WITH 10nF CAPACITORS. LD = LASER DIODE MPD = MONITOR PHOTODIODE 1k 1.5k 1.5k 10 H * * * ** 1 F 1 F 10nF 10nF 10nF 10nF NOTES * DESIGNATES COMPONENTS THAT NEED TO BE OPTIMIZED FOR THE TYPE OF LASER USED. ** FOR DIGITAL PROGRAMMING,THE ADN2850 OR THE ADN2860 OPTICAL SUPERVISOR CAN BE USED. * ** Figure 6. DC-Coupled 50 Mbps to 1.25 Gbps Test Circuit, Data Not Clocked Caution must be used when choosing component values for ac coupling to ensure that the time constant (L/R and RC, see Figure 7) are sufficiently long for the data rate and expected number of CIDs (consecutive identical digits). Failure to do this could lead to pattern dependent jitter and vertical eye closure. For designs with low series resistance, or where external components become impractical, the ADN2848 supports direct connection to the laser diode (see Figure 6). In this case, care must be taken to ensure that the voltage drop across the laser diode does not violate the minimum compliance voltage on the IMODP pin. Optical Supervisor The PSET and ERSET potentiometers may be replaced with a dual-digital potentiometer, the ADN2850 (see Figure 5). The ADN2850 provides an accurate digital control for the average optical power and extinction ratio and ensures excellent stability over temperature. ADN2848 ADN2850 PSET ERSET IMODP IBIAS DAC1 DAC2 SDI SDO CLK CS TX RX CLK CS VCC DATAP DATAN VCC VCC IMPD IDTONE Figure 5. Application Using the ADN2850 Dual 10-Bit Digital Potentiometer with Extremely Low Temperature Coefficient as an Optical Supervisor |
Similar Part No. - ADN2848ACP-32 |
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Similar Description - ADN2848ACP-32 |
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