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AFCT-5963ATLZ Datasheet(PDF) 8 Page - AVAGO TECHNOLOGIES LIMITED |
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AFCT-5963ATLZ Datasheet(HTML) 8 Page - AVAGO TECHNOLOGIES LIMITED |
8 / 15 page 8 Figure 6b. Recommended AC coupled interface circuit The AFCT-5963TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ have a transmit disable function which is a single-ended +3.3 V TTL input which is DC-coupled to pin 8. As for the receiver section, it is internally AC-coupled between the preamplifier and the postamplifier stages. The actual Data and Data-bar outputs of the post- amplifier are DC-coupled to their respective output pins (pins 4, 5). The two data outputs of the receiver should be terminated with identical load circuits. Signal Detect is a single-ended, +3.3 V TTL output signal that is DC-coupled to pin 3 of the module. Signal Detect should not be AC-coupled externally to the follow-on circuits because of its infrequent state changes. Power Supply Filtering and Ground Planes It is important to exercise care in circuit board layout to achieve optimum performance from these transceivers. Figures 6a and 6b show the power supply circuit which complies with the small form factor multisource agreement. It is further recommended that a continuous ground plane be provided in the circuit board directly under the transceiver to provide a low inductance ground for signal return current. This recommendation is in keeping with good high frequency board layout practices. Package footprint and front panel considerations The Avago Technologies transceivers comply with the circuit board “Common Transceiver Footprint” hole pattern defined in the current multisource agreement which defined the 2 x 5 package style. This drawing is reproduced in Figure 7 with the addition of ANSI Y14.5M compliant dimensioning to be used as a guide in the me- chanical layout of your circuit board. Figure 8 shows the front panel dimensions associated with such a layout. Eye Safety Circuit For an optical transmitter device to be eye-safe in the event of a single fault failure, the transmitter must either maintain eye-safe operation or be disabled. The AFCT-5963TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ is intrinsi- cally eye safe and does not require shut down circuitry. Z = 50 Ω Z = 50 Ω Z = 50 Ω Z = 50 Ω SD LVTTL V CC (+3.3 V) V CC (+3.3 V) RD+ RD- Z = 50 Ω 1 1 µH C2 1 µH C1 C3 10 µF T X R X 130 Ω 130 Ω 130 Ω 130 Ω 100 nF 100 nF 100 nF 100 nF 82 Ω 130 Ω V CC (+3.3 V) 130 Ω 82 Ω T DIS (LVTTL) 2 3 4 5 10 9 8 7 6 TD- TD+ Note: C1 = C2 = C3 = 10 nF or 100 nF Note A: CIRCUIT ASSUMES OPEN EMITTER OUTPUT Note B: WHEN INTERNAL BIAS IS PROVIDED REPLACE SPLIT RESISTORS WITH 100 WTERMINATION * C4 AND C5 ARE OPTIONAL BYPASS CAPACITORS FOR ADDITIONAL LOW FREQUENCY NOISE FILTERING. NOTE A NOTE B V CC (+3.3 V) 100 nF 100 nF 82 Ω 130 Ω V CC (+3.3 V) 82 Ω 130 Ω C4 * 10 µF C5 * 10 µF |
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