AS1152 Ver la hoja de datos (PDF) - austriamicrosystems AG

Número de pieza

componentes Descripción

Fabricante

AS1152

Quad LVDS Driver

austriamicrosystems AG 

AS1152

Data Sheet

austriamicrosystems

Power-Supply Bypassing

9 Applications

Table 5. Function Table

Enable Pins

EN

ENn

H

L or Open

H

L or Open

Other Combinations of Enable Pin Settings

Figure 17. Typical Application Circuit

Tx

Input

INx+

INx-

L

L

H

H

Don’t Care

Z

LVDS

Signals

107Ω

Rx

Output

OUTx

H

L

Z

Tx

LVTTL/LVCMOS

Data Inputs

Tx

107Ω

Rx

107Ω

Rx

LVTTL/LVCMOS

Data Outputs

Tx

107Ω

Rx

AS1152

AS1151

Quad LVDS Receiver

100Ω Shielded Twisted Cable or Microstrip PC Board Traces

Power-Supply Bypassing

To bypass VCC, use high-frequency surface-mount ceramic 0.1µF and 0.001µF capacitors in parallel as close to the

device as possible, with the smaller valued capacitor closest to pin VCC.

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.

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Revision 1.00

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