ML6672 データシートの表示（PDF） - Micro Linear Corporation

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ML6672

ATM UTP Transceiver

Micro Linear Corporation 

ML6672

PIN CONFIGURATION

ML6672

32-Pin PLCC (Q32)

RXOUT+ 5

RVCCD 6

SD– 7

SD+ 8

N/C 9

TGNDD 10

LPBK 11

TXOFF 12

N/C 13

4 3 2 1 32 31 30

14 15 16 17 18 19 20

29 RRSET1

28 RRSET2

27 RSET1

26 RSET2

25 RGND

24 RTH1

23 RTH2

22 TVCCA

21 TGNDA

ML6672

32-Pin TQFP (H32-7)

RRSET1 1

TPIN– 2

TPIN+ 3

CMREF 4

CAP2 5

CAP1 6

RVCCA 7

RXOUT– 8

32 31 30 29 28 27 26 25

24 TPOUT–

23 TPOUT+

22 RTSET2

21 RTSET1

20 TVCCD

19 TXIN–

18 TXIN+

17 N/C

9 10 11 12 13 14 15 16

PIN DESCRIPTION

NAME

TXIN+, TXIN–

TPOUT+,

TPOUT–

LPBK

TXOFF

RTSET1,

RTSET2

TVCCA,

TVCCD

TGNDA,

TGNDD

SD+, SD–

TPIN+, TPIN–

FUNCTION

These differential ECL100K compatible

inputs receive NRZ data from the PHY for

transmission.

Outputs from the NRZ buffer drive these

differential current outputs. The

transmitter filter/transformer module

connects the media to these pins.

This TTL input enables transmitter-

Receiver loopback internally when

asserted low.

This TTL input forces the NRZ buffer to a quiet

state when asserted low.

An external 1% resistor connected

between these pins controls the

transmitter output current amplitude.

IOUT = 64 x 1.25V/RTSET

Separate analog and digital

transmitter power supply pins help to

isolate sensitive circuitry from noise

generating digital functions. Both supplies

are nominally +5 volts.

Analog and digital transmitter grounds

provide separate return paths for clean

and noisy signals.

These differential ECL100K compatible

outputs indicate the presence of a data

signal with an amplitude exceeding a

preset threshold.

NRZ encoded data from the receiver filter/

transformer module enters the Receiver

through these pins.

NAME

FUNCTION

RXOUT+,

RXOUT–

CAP1, CAP2

RRSET1,

RRSET2

CMREF

RVCCA,

RVCCD

RGND

RSET1, RSET2

RTH1, RTH2

Differential ECL100K compatible outputs

provide NRZ encoded data to the PHY.

Two external capacitors connected to

these pins sets the time constant for the

adaptation in the equalizer loop as well

as for signal detect response.

Internal time constants controlling the

equalizer’s transfer function are set by an

external resistor connected across these

pins.

This pin provides a DC common mode

reference point for the receiver inputs.

Analog and digital supply pins are

separated to isolate clean and noisy

circuit functions. Both supplies are

nominally +5 volts.

Receiver ground.

An external 5kW resistor across these pins

sets up an internal reference current.

An external resistor connected across

these pins sets the internal levels for

equalization as well as signal detect. This

resistor allows compensation for transmit

and magnetics variations. RTH should be

set to match the peak-to-peak transmit

amplitude. VAMP = 16 x 1.25 x RTH/RSET

where VAMP is the peak-to-peak

amplitude of the transmit output with

zero length cable.

2

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