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MAX3747AEUB Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3747AEUB Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 10 page 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers _______________________________________________________________________________________ 9 Loss-of-Signal Indicator The MAX3747/MAX3747A are equipped with LOS cir- cuitry that indicates when the input signal is below a pro- grammable threshold, set by a voltage on the TH pin (see the Typical Operating Characteristics). The voltage on the TH pin is set by two resistors, one connecting from the TH pin to VCC and the other connecting from TH to VREF (Figure 5). An RMS power detector compares the input signal amplitude with this threshold and feeds the signal-detect information to the LOS output, which is open collector. To prevent LOS chatter in the region of the programmed threshold, approximately 2dB of hys- teresis is built into the LOS assert/deassert function. Once asserted, LOS is not deasserted until the input amplitude rises to the required level. Figure 6 shows the LOS output circuit. Applications Information Program the LOS Assert Threshold Program the LOS assert threshold according to Figure 5. The combination of R1 and R2 should be greater than or equal to 5k Ω, see the Assert/Deassert vs. VTH graph in the Typical Operating Characteristics. Select the Coupling Capacitor When AC-coupling is desired, coupling capacitors CIN and COUT should be selected to minimize the receiv- er’s deterministic jitter. Jitter is decreased as the input low-frequency cutoff (fIN) is decreased: fIN = 1 / [2 π(50)(CIN)] For all applications, the recommended value for CIN and COUT is 0.1µF, which provides fIN equal to 32kHz. Refer to Application Note HFAN-1.1: Choosing AC-Coupling Capacitors on the Maxim website (www.maxim-ic.com). EMI Performance The MAX3747/MAX3747A have been designed for bet- ter EMI performance. To help reduce EMI, special care has been taken to produce symmetrical signal outputs. Chip Information TRANSISTOR COUNT: 443 PROCESS: SiGe Bipolar TH VREF R2 R1 VCC VTH = (R1 x (VREF - VCC)) / (R2 + R1) VTH IS VCC REFERENCED R1 + R2 ≥ 5kΩ Figure 5. MAX3747/MAX3747A LOS Threshold Circuit ESD STRUCTURE VCC LOS Figure 6. MAX3747/MAX3747A LOS Output Circuit 1 2 3 4 5 10 9 8 7 6 VCC OUT+ OUT- LOS VREF IN- IN+ DISABLE MAX3747 MAX3747A µMAX TOP VIEW GND TH Pin Configuration |
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