MAX3946ETG+ - Brand New Maxim Integrated Laser Drivers
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General Description
The MAX3946 is a +3.3V, multirate, low-power laser diode driver designed for Ethernet and Fibre Channel transmission systems at data rates up to 11.3Gbps. This device is optimized to drive a differential transmitter optical subassembly (TOSA) with a 25I flex circuit. The unique design of the output stage enables use of unmatched TOSAs, greatly reducing headroom limitations and lowering power consumption.
The device receives differential CML-compatible signals with on-chip line termination. It can deliver laser modulation current of up to 80mA, at an edge speed of 22ps (20% to 80%), into a 5I to 25I external differential load. The device is designed to have a symmetrical output stage with on-chip back terminations integrated into its outputs. A high-bandwidth, fully differential signal path is implemented to minimize deterministic jitter. An equalization block can be activated to compensate for the SFP+ connector. The integrated bias circuit provides programmable laser bias current up to 80mA. Both the laser bias generator and the laser modulator can be disabled from a single pin.
A 3-wire digital interface reduces the pin count and permits adjustment of input equalization, pulse-width adjustment, Tx polarity, Tx deemphasis, modulation current, and bias current without the need for external components. The MAX3946 is available in a 4mm x 4mm, 24-pin TQFN package.Features
♦ 225mW Power Dissipation Enables < 1W SFP+ Modules
♦ Up to 100mW Power Consumption Reduction by Enabling the Use of Unmatched FP/DFB TOSAs
♦ Supports SFF-8431 SFP+ MSA and SFF-8472 Digital Diagnostic
♦ 225mW Power Dissipation at 3.3V (IMOD = 40mA, IBIAS = 60mA Assuming 25I TOSA)
♦ Single +3.3V Power Supply
♦ Up to 11.3Gbps (NRZ) Operation
♦ Programmable Modulation Current from 10mA to 100mA (5Ω Load)
♦ Programmable Bias Current from 5mA to 80mA
♦ Programmable Input Equalization
♦ Programmable Output Deemphasis
♦ 25Ω Output Back Termination at TOUT+ and TOUT
♦ DJ Performance 7psP-P with Mismatched Differential Load (5Ω)
♦ DJ Performance 5psP-P with Mismatched Differential Load (25Ω)
♦ DJ Performance 5psP-P with 50Ω Differential Load
♦ Programmable Pulse Width
♦ Edge Transition Times of 22ps
♦ Bias Current Monitor
♦ Integrated Eye Safety Features
♦ 3-Wire Digital Interface
♦ -40°C to +95°C OperationApplications
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Datasheet
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- Datasheet: Download MAX3946ETG+
- Chipdatas Part: CD90-MAX3946ETG+
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
- Free Shipping: Yes
- Prority Shipping: Yes, 3-5 days
- Last Updated: 2024/06/13 17:33 +0800
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- Full Refund if you don't receive your order
- Full or Partial Refund , If the item is not as described
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