TNETEL1400

EtherLoop

™ TRANSCEIVER

SPHS004A – FEBRUARY 1999 – REVISED MARCH 1999

5

POST OFFICE BOX 655303

Terminal Functions

transmit (TX)

TERMINAL

I/O†

DESCRIPTION

NAME

NO.

I/O†

DESCRIPTION

CBIAS1

2

I/O

Transmit voltage bias decoupling

IN_INT

6

I

Transmit interstage ac coupling pin 1 (negative side)

IP_INT

4

I

Transmit interstage ac coupling pin 2 (positive side)

ON_INT

7

O

Transmit interstage ac coupling pin 2 (negative side)

OP_INT

5

O

Transmit interstage ac coupling pin 1 (positive side)

REMREF

3

O

Transmit temperature-compensating bias reference

TX_EN

26

I

Transmit enable

1 = Transmitter enabled

0 = Transmitter disabled

TXBIAS

16

I

Transmit current bias

TXGAIN3

TXGAIN2

TXGAIN1

TXGAIN0

23 (MSB)

22

21

20 (LSB)

I

Transmit preattenuation select (0 to –30 dB in –3-dB steps)

0000 = 0 dB

0001 = – 3 dB

•

•

•

1010 = –30 dB

1011 = TX OFF

•

•

•

1110 = TX OFF

1111 = TX OFF

TXINN

10

I

Transmit input negative. TXINN can be coupled to ground for SE input).

TXINP

9

I

Transmit input positive. TXINP can be coupled to ground for SE input).

TXON

46

O

Transmitter output negative

TXOP

45

O

Transmitter output positive

† I = input, O = output