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Revision 1.19

10 - 15

AS1150, AS1151

Data Sheet

9 Applications

Figure 17. Typical Application Circuit

Power-Supply Bypassing

Differential Traces

Input trace characteristics can adversely affect the performance of the AS1150 and AS1151.

!

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

must also be matched to this characteristic impedance.

!

Eliminate reflections and ensure that noise couples as common mode by running differential traces close together.

!

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

≥ +100mV

H

≤ +100mV

L

AS1150 – Open, undriven short, or undriven

100

Ω parallel termination

H

AS1151 – Open or undriven short

Other Combinations of Enable Pin Settings

Don’t Care

Z

LVDS

Signals

107

Ω

107

Ω

107

Ω

107

Ω

LVTTL/LVC-

MOS

Data Inputs

LVTTL/LVC-

MOS

Data Outputs

100

Ω Shielded Twisted Cable or Microstrip PC Board Traces

Tx

Tx

Tx

Tx

Rx

Rx

Rx

Rx

AS1151

AS1152

Quad LVDS Driver