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AS1152

Data Sheet

Power-Supply Bypassing

9 Applications

Figure 17. Typical Application Circuit

Power-Supply Bypassing

Differential Traces

Input trace characteristics can adversely affect the performance of the AS1152.

!

Use controlled-impedance PC board traces to match the cable characteristic impedance. The termination resistor is

also matched to this characteristic impedance.

!

Eliminate reflections and ensure that noise couples as common mode by running the differential traces near each

other.

!

Reduce skew by using matched trace lengths. Tight skew control is required to minimize emissions and proper data

recovery of the devices.

!

Route each channel’s differential signals very close to each other for optimal cancellation of their respective exter-

nal magnetic fields. Use a constant distance between the differential traces to avoid irregularities in differential

impedance.

!

Avoid 90° turns (use two 45° turns).

!

Minimize the number of vias to further prevent impedance irregularities.

Table 5. Function Table

Enable Pins

Input

Output

EN

ENn

INx+

INx-

OUTx

H

L or Open

L

L

H

H

L or Open

HH

L

Other Combinations of Enable Pin Settings

Don’t Care

Z

Z

LVDS

Signals

107

Ω

107

Ω

107

Ω

107

Ω

LVTTL/LVCMOS

Data Inputs

LVTTL/LVCMOS

Data Outputs

100

Ω Shielded Twisted Cable or Microstrip PC Board Traces

Tx

Tx

Tx

Tx

Rx

Rx

Rx

Rx

AS1151

Quad LVDS Receiver

AS1152