ML4664 datasheet(4/16 Pages) MICRO-LINEAR

4 / 16 page

ML4664/ML4669

NAME

FUNCTION

22(21) VREF

A 2.5V reference with respect to GND

23(22) VTHADJ

This input pin sets the link monitor

threshold

24(23) AGND

Analog Filtered Ground

25(24) OPINN

This input pin should be capacitively

coupled to filtered AVCC. The input

resistance is approximately 1.3k

26(25) OPINP

This input pin should be capacitively

coupled to the input source. The input

resistance is approximately 1.3k

27(26) AVCC

Analog Filtered 5V

28(28) OPLED

Indicates reception is taking place on

the OPINP, OPINN pair. Active low

LED driver, open collector. It is

extended 16ms for usability. This pin

may be grounded to disable the

twisted pair outputs. If this pin is not

used as an LED driver, and is not

grounded, a 2k

W, 5% resistor should

be connected between this pin and

VCC.

NAME

FUNCTION

17(15) LMON

Link Monitor “Low Light” LED status

output. Pulled low when voltage on

the OPINP, OPINN inputs exceed min

threshold set by VTHADJ , and there are

transitions on OPINP, OPINN

indicating an idle signal or active

data. If the voltage on OPINP, OPINN

inputs falls below the minimum

threshold or transitions cease on

OPINP, OPINN, LMON will go high.

Active low LED driver, open collector.

In the low light state, optical and

twisted pair transmitters are disabled

from sending data. The optical

transmitter of the ML4664 does send

an idle signal, and link pulses are sent

at the twisted pair transmitter. For the

ML4669, the twisted pair transmitter

will not send link pulses, the optical

transmitter may send an idle signal,

depending on inputs. See Table 1.

18(16) OPVCC

5V supply for fiber optic

LED driver

19(17) OPOUT

Fiber optic LED driver output

21(20) VDC

An external capacitor on this pin

integrates an error signal which nulls

the offset of the input amplifier. If the

DC feedback loop is not being used,

this pin should be connected to VREF.

PIN DESCRIPTION (Continued)

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