Laser Driver With Impedance Mismatch Tolerance - China

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.

S 225mW Power Dissipation Enables < 1W SFP+

Modules

S Up to 100mW Power Consumption Reduction by

Enabling the Use of Unmatched FP/DFB TOSAs

S Supports SFF-8431 SFP+ MSA and SFF-8472

Digital Diagnostic

S 225mW Power Dissipation at 3.3V (IMOD = 40mA, IBIAS = 60mA Assuming 25I TOSA)

S Single +3.3V Power Supply

S Up to 11.3Gbps (NRZ) Operation

S Programmable Modulation Current from 10mA to

100mA (5I Load)

S Programmable Bias Current from 5mA to 80mA

S Programmable Input Equalization

S Programmable Output Deemphasis

S 25I Output Back Termination at TOUT+ and

TOUTS

DJ Performance 7psP-P with Mismatched

Differential Load (5I)

S DJ Performance 5psP-P with Mismatched

Differential Load (25I)

S DJ Performance 5psP-P with 50I Differential Load

S Programmable Pulse Width

S Edge Transition Times of 22ps

S Bias Current Monitor

S Integrated Eye Safety Features

S 3-Wire Digital Interface

S -40°C to +95°C Operation

Company Contact:

• Posted By: kynix semiconductor

• Phone: 15973310720

• Address: Flat 08,4/F Shing Yip Ind Bldg,19-21 Shing Yip Street Kwun Tongkowloon Hong Kong., hongkong , China

• Email:

• Website: https://www.kynix.com

• Business Description: Kynix Semiconductor HongKong Limited was founded in 2008, specializing in electronic components distribution business.
  
  We adhere to honesty and ethics as our business philosophy, and have gradually established an excellent reputation and credibility in our international business.
  
  With the accurate quotation, excellent credit, reasonable price, reliable quality, fast delivery, authentic service, we have won the praise of majority of customers.