MIC3001_11 datasheet(7/76 Pages) MICREL

7 / 76 page

Micrel, Inc.

MIC3001

August 2004

M9999-082404-A

hbwhelp@micrel.com or (408) 955-1690

Pin Configuration

24-Pin MLF®

Pin Description

Pin Number

Pin Name

Pin Function

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.

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

GNDA

Ground return for analog functions.

VDDA

Power supply input for analog functions.

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.

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.

SHDN (TXFIN)

Digital output; Programmable polarity. When used as shutdown output (SHDN), asserted

at the detection of a fault condition that can be used to activate a second series transistor

in the laser current path, enhancing protection against single-point failures. When

programmed as TXFIN, it is an input for external fault signals to be ORed with the internal

fault sources to drive TXFAULT.

SHDN (TXFIN)

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.

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.

TXFAULT

Digital Output; Open-Drain. A high level indicates a hardware fault impeding transmitter

operation. The state of this input is always reflected in the TXFLT bit.

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