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MAX3969ETP Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3969ETP Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page Select CFILTER For SFP/SFF, FDDI, 155Mbps ATM LAN, Fast Ethernet, and ESCON receivers, Maxim recommends CFILTER = 0.01µF. This capacitor value ensures chatter-free LOS/SD and provides a typical assert/deassert time of 10µs. For other applications, the value of CFILTER can be calculated using the following equation: CFILTER = τ / 825Ω where τ is the desired time constant of the power detector. Select CAZ and CIN External-coupling capacitors (CIN) are required on the data inputs for the offset correction loop to function properly. The offset correction loop bandwidth is deter- mined by the external capacitor (CAZ) connected between CZP and CZN. The poles associated with CIN and CAZ must work together to provide a flat response at the lower -3dB corner frequency. For SFP/SFF, FDDI, 155Mbps ATM LAN, Fast Ethernet, and ESCON receivers, Maxim recommends the following: CIN = 0.01µF CAZ = 0.027µF 200Mbps SFP Limiting Amplifier _______________________________________________________________________________________ 7 VCCO OUT- OUT+ ESD STRUCTURES Figure 2. Equivalent PECL Output Circuit LOS/LOS ESD STRUCTURES VCCO Figure 3. Equivalent TTL Output Circuit PIN-TIA RESPONSIVITY = G 1.8dB 2.5dB 10 log(OPTICAL POWER) 20 log(VIN) RX_MAX (SENSITIVITY) SD HIGH / LOS LOW SD LOW / LOS HIGH 5dB 3.6dB VIN_TH VIN_SEN Figure 4. Signal Levels for Power-Detect Threshold |
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