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AS1154-BSOT Datasheet(PDF) 10 Page - ams AG |
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AS1154-BSOT Datasheet(HTML) 10 Page - ams AG |
10 / 15 page www.austriamicrosystems.com Revision 1.01 10 - 15 AS1156/AS1154 Data Sheet - A p p l i c a t i o n s 9 Applications Figure 19. Typical Application Circuit 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 AS1156/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 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. Cables and Connectors Supported transmission media include printed circuit board traces, backplanes, and cables. Use cables and connectors with matched differential impedance (typically 100 Ω) to minimize impedance mis- matches. Balanced cables such as twisted pair offer superior signal quality and tend to generate less EMI due to magnetic field canceling effects. Balanced cables pick up noise as common mode, which is rejected by the LVDS receiver. Avoid the use of unbalanced cables such as ribbon cable or simple coaxial cable. Table 5. Function Table Input Output INx OUTx+ OUTx- LL H H HL 0.8V < VINx < 2.0V Undetermined Undetermined LVDS Signals 107 Ω LVTTL/LVCMOS Data Inputs LVTTL/LVCMOS Data Outputs 100 Ω Shielded Twisted Cable or Microstrip PC Board Traces Tx Rx AS1158 Single LVDS Receiver AS1156 0.1µF 0.001µF +3.3V 0.1µF 0.001µF +3.3V |
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