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MIC3002GML Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC3002GML Datasheet(HTML) 7 Page - Micrel Semiconductor |
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7 / 65 page  Micrel, Inc. MIC3002 July 2007 7 M9999-073107-B hbwhelp@micrel.com or (408) 955-1690 Pin Configuration 24-Pin MLF ® (MLF-24) Pin Description Pin Number Pin Name Pin Function 1 FB Analog Input. Feedback voltage for the APC loop op-amp. Polarity and scale are programmable via the APC configuration bits. Connect to VBIAS if APC is not used. 2 VMPD Analog Input. Multiplexed A/D converter input for monitoring transmitted optical power via a monitor photodiode. In most applications, VMPD will be connected directly to FB. The input range is 0 - VREF or 0 - VREF/4 depending on the setting of the APC configuration bits 3 GNDA Ground return for analog functions. 4 VDDA Power supply input for analog functions. 5 VILD– Analog Input. Reference terminal for the multiplexed pseudo-differential A/D converter inputs for monitoring laser bias current via a sense resistor (VILD+ is the sensing input). Tie to VDD or GND to reference the voltage sensed on VILD+ to VDD or GND, respectively. Limited common-mode voltage range, see “Applications Information” section for more details. 6 VILD+ Analog Input. Multiplexed A/D input for monitoring laser bias current via a sense resistor (signal input); accommodates inputs referenced to VDD or GND (see pin 5 description). Limited common- mode voltage range, see “Applications Information” section for more details. 7 SHDN/TXFIN Digital output/Input; programmable polarity. When used as shutdown output (SHDN), OEMCFG3-2 set to 0, SHDN is asserted at the detection of a fault condition if OEMCFG4-7 is set to 0. If the latter bit is set to 1, a fault condition will not assert SHDN. When programmed as TXFIN, it is an input for external fault signals to be ORed with the internal fault sources to drive TXFAULT. 8 VRX Analog Input. Multiplexed A/D converter input for monitoring received optical power. The input range is 0 to VREF. A 5-bit programmable EEPOT on this pin provides for coarse calibration and ranging of the RX power measurement. 9 XPN Analog Input/Output. Optional connection to an external PN junction for sensing temperature at a remote location. The Zone bit in OEMCFG1 determines whether temperature is measured using the on-chip sensor or the remote PN junction. 10 TXFAULT Digital Output; Open-Drain, programmable polarity. If OEMCFG5-4 is set to 0, a high level indicates a hardware fault impeding transmitter operation. The state of this pin is always reflected in the TXFLT bit. |
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