AS1154_V2 Просмотр технического описания (PDF) - austriamicrosystems AG

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производитель

AS1154_V2

Dual LVDS Driver

austriamicrosystems AG 

AS1154

Datasheet - Applications

9 Applications

Table 5. Function Table

Input

INx

L

H

0.8V < VINx < 2.0V

OUTx+

L

H

Undetermined

Output

OUTx-

H

L

Undetermined

Figure 19. Typical Application Circuit

LVTTL/LVCMOS

Data Inputs

+3.3V

0.001µF

0.1µF

Tx

LVDS

Signals

107Ω

+3.3V

0.001µF

0.1µF

Rx

LVTTL/LVCMOS

Data Outputs

AS1154

AS1157

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 AS1154.

„ 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 external 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.

www.austriamicrosystems.com/Interfaces-LVDS/AS1154

Revision 1.02

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