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ACS411CS Datasheet(PDF) 23 Page - Semtech Corporation |
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ACS411CS Datasheet(HTML) 23 Page - Semtech Corporation |
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23 / 43 page  23 ACS411CS PRE-RELEASE Issue 6.0 July 1999. Laser/LED Considerations Since LEDs or Lasers from different suppliers may emit different wavelengths, it is recommended that the Lasers/LEDs in a communicating pair of modems are obtained from the same supplier. Acapella will assist with contact names and addresses on request. Power Supply Decoupling The ACS9020 contains a highly sensitive amplifier, capable of responding to extremely low current levels. To exploit this sensitivity it is important to reduce external noise to a low level compared to the input signal from the Laser/LED. The modem should have an independent power trace to the point where power enters the board. The Laser/LED should be sited very close to the PMN, PINP, PINN, LAN and LAP pins. A generous ground plane should be provided, especially surrounding the sensitive PINP and PINN tracks from the ACS9020 pins to the optical component. The modem should be protected from EMI/RFI sources in the standard ways. LOSS ( Loss Of Synchronisation) There are two conditions that will make LOSS go to Logic 1. These are: i) Loss of synchronisation - synchronisation windows incorrectly aligned i.e DCD=0. ii) 64 received symbols break the 8B10B encoding rules in a sequence of 256 symbols. In order to return LOSS to the Logic 0 state the following criteria must be met: i) The devices must be synchronised - synchronisation windows correctly aligned i.e DCD=1. ii) There are no received symbols in a sequence of 256 symbols which break the 8B10B coding rules. Figure 13: Power supply considerations. Place all power supply inductors and decoupling capacitors as close to the ACS9020 device as possible. GND 100nF VDD VDD VDD +5V 100 µ F + 100 nF (GND) 0V VDD L = 47 µH R < 1 Ω 100nF GND VB TXVDD GND 100nF VDD GND GND VD+ GND ACS9020 (2 off) ACS4110 GND 100nF GND 100nF GND 100nF VDD VA+ GND VB 100nF Place all power supply decoupling capacitors as close to the ACS4110 device as possible. VD+ pins are 6, 38, 52, 82, 85, 94, 105, 139, 161, 162 GND pins are 5, 37, 51, 81, 84, 108, 122, 123, 124, 128, 130, 138, 159, 160 GND pins are 9, 24, 42, 58 GND GND |
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