MIC3000_07 datasheet(5/68 Pages) MICREL

5 / 68 page

October 2004

M9999-101204

MIC3000

Micrel

Pin Configuration

9 10 11 12

24 23 22 21 20 19

VMPD

GNDA

VDDA

VILD–

VILD+

VDDD

GNDD

RSIN

VIN

CLK

24-Pin MLF®

Pin Descriptions

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 depend-

ing 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

Digital output; Programmable polarity. 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.

VRX

Analog Input. Multiplexed A/D converter input for monitoring received optical

power. The input range is 0 to VREF.

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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