MIC3000_07 datasheet(6/68 Pages) MICREL

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MIC3000

Micrel

M9999-101204

October 2004

Pin Descriptions

Pin Number

Pin Name

Pin Function

TXDISABLE

Digital Input; Active High. The transmitter is disabled when this line is high or

the STXDIS bit is set. The state of this input is always reflected in the TXDIS

bit.

DATA

Digital I/O; Open-drain. Bi-directional serial data input/output.

CLK

Digital Input; Serial bit clock input.

VIN

If bit 4 (IE) in USRCTL register is set to 0 (default), this pin is configured as

analog input. If IE bit is set to 1, this pin is configured as open-drain output.

Analog Input: Multiplexed A/D input for monitoring supply voltage. 0V to

5.5V input range.

Open-drain output: outputs the internally generated interrupt signal /INT.

RSIN

Digital Input; Rate select input; ORed with rate select bit to determine the

state of the RSOUT pin. The state of this pin is always reflected in the RSEL

bit.

GNDD

Ground return for digital functions.

No connection. This pin is used for test purposes and must be left uncon-

nected.

VDDD

Power supply input for digital functions.

RXLOS

Digital Output; Active-High/Open-Drain. Indicates the loss of the received

signal as indicated by a level of received optical power below the pro-

grammed RXLOS comparator threshold; may be wire-ORed with external

signals. Low indicates normal operation. The LOS bit reflects the state of

RXLOS whether driven by the MIC3000 or an external circuit.

RSOUT

Digital Output. Open-Drain. This output is controlled by the SRSEL bit ORed

with RSIN input and is open drain only.

COMP

Analog Output, compensation terminal. Connect a capacitor between this pin

and GNDA or VDDA with appropriate value to tune the APC loop time

constant to a desirable value.

VBIAS

Analog Output. Buffered DAC output capable of sourcing or sinking up to

10mA under control of the APC function to drive an external transistor for

laser diode D.C. bias. The output and feedback polarity are programmable to

accommodate either a NPN or an PNP transistor to drive a common anode

or common-cathode laser diode.

VMOD–

Analog Input. Inverting terminal of VMOD buffer op-amp. Connect to VMOD+

(gain = 1) or feedback resistors network to set a different gain

VMOD+

Analog Output. Buffered DAC output to set the modulation current on the

laser driver IC. Operates with either a 0– VREF or a (VDD–VREF) – VDD

output swing so as to generate either a ground-referenced or a VDD refer-

enced programmed voltage. A simple external circuit can be used to

generate a programmable current for those drivers that require a current

rather than a voltage input. See “Applications Information” section for more

details.

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