ADN8102ACPZ-R7 datasheet(16/32 Pages) AD

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ADN8102

Rev. A | Page 16 of 32

THEORY OF OPERATION

RECEIVE

EQUALIZATION

TRANSMIT

PRE-EMPHASIS

TRANSMIT

PRE-EMPHASIS

RECEIVE

EQUALIZATION

2:1

CONTROL LOGIC

ADN8102

Ix_B[3:0]

LOS_B

Ox_A[3:0]

ADDR[1:0]

SCL

SDA

RESET

Ox_B[3:0]

LOS_A

Ix_A[3:0]

PE_A[1:0]

EQ_A[1:0]

EQ_B[1:0]

PE_B[1:0]

ENA

ENB

Figure 37. Simplified Functional Block Diagram

INTRODUCTION

The ADN8102 is a quad bidirectional cable and backplane

equalizer that provides both input equalization and output pre-

emphasis on both the line card and cable sides of the device.

The device supports full loopback and through connectivity

of the two unidirectional half-links, each consisting of four

differential signal pairs.

The ADN8102 offers extensively programmable output levels

and pre-emphasis as well as the ability to disable the output

current. The receivers integrate a programmable, multizero

equalizer transfer function that is optimized to compensate

either typical backplane or typical cable losses.

The I/O on-chip termination resistors are terminated to user-

settable supplies to support dc coupling in a wide range of logic

styles. The ADN8102 supports a wide core supply range; VCC

can be set from 1.8 V to 3.3 V. These features, together with

programmable output levels, allow for a wide range of dc- and

ac-coupled I/O configurations.

RECEIVERS

Input Structure and Input Levels

The ADN8102 receiver inputs incorporate 50 Ω termination

resistors, ESD protection, and a multizero transfer function

equalizer that can be optimized for backplane or cable operation.

Each channel also provides a programmable loss-of-signal (LOS)

function that provides an interrupt that can be used to squelch

or disable the associated output when the differential input voltage

falls below the programmed threshold value. Each receive channel

also provides a P/N inversion function that allows the user to

swap the sign of the input signal path to eliminate the need for

board-level crossovers in the receiver channel.

Table 5 illustrates some, but not all, possible combinations of

input supply voltages.

Table 5. Common Input Voltage Levels

Configuration

VCC (V)

VTTI (V)

Low VTTI, AC-Coupled Input

1.8

1.6

Single 1.8 V Supply

1.8

3.3 V Core

3.3

1.8

Single 3.3 V Supply

3.3

VCC

VTTI

VEE

SIMPLIFIED RECEIVER INPUT CIRCUIT

RLN

RLP

1kΩ

750Ω

52Ω

Figure 38. Simplified Input Structure

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