MAX3643 Datasheet | Maxim Integrated

Description The MAX3643 burst-mode laser driver provides bias and modulation current drive for PON burst-mode ONT applications. It is specifically designed for use with a low-cost external controller for the APC (and if desired, AMC) loop. A high-speed differential burst-enable input enables the driver to switch the laser from a dark (output off) condition to full on-condition in less than 2ns. When BEN is inactive, typical modulation and bias currents are 5µA each. Laser modulation current can be set from 10m A to 85m A and bias current can be set from 1m A to 70m A using the MODSET and BIASSET inputs. A sample-andhold circuit is provided to capture the monitor diode output during short PON bursts, if needed, and the BEN high-speed signal is mirrored on an LVCMOS output to be used by the controller operating the APC/AMC loop. The MAX3643 burst-mode laser driver is packaged in a 4mm x 4mm, 24-pin thin QFN package. It operates from -40°C to +85°C. Applications A/B/G/XGPON ONT Modules Up to 2.5Gbps 1.25Gbps IEEE EPON ONT Modules Features - 10m A to 85m A Modulation Current - 1m A to 70m A Bias Current - Monitor Diode Sample and Hold - 45ps Output Transition Time - 2ns Turn-On/-Off Time - Reference Voltage Generator - LVPECL High-Speed Inputs (Data, Burst Enable) Ordering Information PART TEMP RANGE PIN-PACKAGE MAX3643ETG -40°C to +85°C 24 TQFN-EP- MAX3643ETG+ -40°C to +85°C 24 TQFN-EP- +Denotes a lead(Pb)-free/Ro HS-pliant package. - EP = Exposed paddle. Pin Configuration appears at end of data sheet. Typical Application Circuit 3.3V 3.3V SERIAL DATA SOURCE 130Ω 130Ω Z0 = 50Ω Z0 = 50Ω 82Ω 82Ω IN+ IN- 3.3V +3.3V FILTER VCC BURST CONTROL 130Ω 130Ω Z0 = 50Ω Z0 = 50Ω 82Ω 82Ω BEN+...