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A CONEXANT BUSINESS

Ω load,in AC-coupled or DC-coupledmode.The DC-coupled mode significantly reduces power consumption.Unlike many competing devices,the CX02066 is capable ofoperating in this mode at 3.3 V,further reducing power consumption.Amonitor photodiode mounted in the laser package isused to convert the optical power into a photocurrent. The MPC loop adjusts the laser bias current so that the voltage at PD is matched to an on-chip reference voltage.

3 Gbps Laser Driver

CX02066 Product Brief - 34685 CX02066

3.3 Volt Highly Integrated,ProgrammableLaser Driver IC for SONET/SDH Applications >

KEYFEATURES

> Differential data and clock inputs minimize pattern-dependent jitter > High-speed operation; suitable for applications up to 3 Gbps
Mindspeed Technologies’ ™ 3 Gbps laser driver deliversindustry-leading power-consumption figures in small form-factor BCC packages.Ideal for datacom and telecom modules,it enables a progression path into OC-48 applications with a low external component count.The CX02066 is a highly integrated,programmable laserdriver intended for short-reach SONET/SDH applications with forward error correction (FEC).The versatileCX02066 can be used in lower data-rate access rings (OC-12 and lower),as well as in metro link add/drop multiplexers operating at OC-48.Using differential PECL data and clock inputs,the CX02066 supplies the bias and modulation current for driving an edge-emitting laser.The modulation output can be DC-coupled to the laser diode,giving a significant power savings over AC-coupled operation.The CX02066 includes automatic power control (APC) tomaintain a constant average laser output power over temperature and life.In addition,the modulation current is temperature-compensated to minimize variation in extinction ratio over temperature.Output flags indicatelaser end-of-life as well as failure ofthe APC circuitry to maintain average output power.The CX02066 laser driver consists ofa high-speed modulation driver and a laser bias generator with mean power control (MPC).It is optimized for high-speed, low-power operation with a 3.3 Vsupply.To minimize thepattern-dependent jitter ofthe input signal,the device accepts an input clock signal for data retiming.To maintain constant average optical power,the CX02066 incorporates a control loop to compensate for the changes in laser threshold current over temperature and lifetime.The modulator output stage is designed to drive up to 85 mAinto a 25 > Bias and modulation current monitor > DC- or AC-coupled modulation drive consumes significantly less power than competing solutionsat 3.3 volts > Automatic laser power control,with programmable temperature compensation and ‘slow-start’ > Minimal external component count

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