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AD8158-EVALZ

6.5 Gbps Quad Buffer Mux/Demux

Analog Devices 

AD8158

RECEIVERS

The AD8158 receivers incorporate 50 Ω on-chip termination,

ESD protection, and a multizero equalization function capable

of delivering up to 18 dB of boost at 4.25 GHz. The AD8158 can

compensate signal degradation at 6.5 Gbps from over 40 inches

of FR-4 backplane trace. The receive path also incorporates a

loss-of-signal (LOS) function with user programmable thresh-

old and hysteresis, which squelches the associated transmitter

when the midband differential voltage falls below a specified

threshold value. Finally, the receivers implement a sign-swapping

option (P/N swap), which allows the user to invert the sign of

the input signal path and eliminates the need for board-level

crossovers in the receive channels.

Input Structure and Allowed Input Levels

The AD8158 tolerates an input common-mode range (meas-

ured with zero differential input) of

VEE + 0.6 V < VIN_CM < VCC + 0.3 V

Typical supply configurations include, but are not limited to,

those listed in Table 11.

Table 11. Typical Input Supply Configurations

Configuration

DVCC

VCC

VTTI

Low VTTI, AC-Coupled Input

3.3 V − 1.8 V 1.8 V 1.6 V

Single 1.8 V Supply

3.3 V − 1.8 V 1.8 V 1.8 V

3.3 V Core

3.3 V

3.3 V 1.8 V

Single 3.3 V Supply

3.3 V

3.3 V 3.3 V

When dc-coupling with LVDS, CML, or ECL signals, it can be

advantageous to operate with split or negative supplies (see the

Applications Information section). In these applications, it is

necessary to observe the maximum voltage ratings between VCC

and VEE and generally to select supply voltages for VTTO and VTTI

in the range of VCC to VEE to avoid activating the ESD protection

devices.

VCC

VTTI

IP_xx

IN_xx

ESD

ON-CHIP TERMINATION

RP

RTERM

RN

RTERM

EQUALIZER

VTHRESH

LOSS

OF

SIG

SIGNAL

DETECT

EQ OUT

VEE

VCC

VTTI

IP_xx

IN_xx

VEE

Figure 37. Functional Diagram of the AD8158 Receiver

RLN

RLP

RP

RN

RL

RL

52Ω

52Ω R1

750Ω

Q1

R2

750Ω

R3

1kΩ

Q2

I1

Figure 38. Simplified Receiver Input Structure

Rev. 0 | Page 18 of 36

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