02066-BRF-001-A MA-COM | Alldatasheet

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Technical content

3.3 Volt Highly Integrated,Programmable

Laser Driver IC for SONET/SDH Applications Mindspeed Technologies’™ 3 Gbps laser driver delivers industry-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 laser driver intended for short-reach SONET/SDH applications with forward error correction (FEC). The versatile CX02066 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) to maintain 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 indicate laser end-of-life as well as failure of the APC circuitry to maintain average output power. The CX02066 laser driver consists of a 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 V supply. To minimize the pattern-dependent jitter of the 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 mA into a 25 Ω load, in AC-coupled or DC-coupled mode. The DC-coupled mode significantly reduces power consumption. Unlike many competing devices, the CX02066 is capable of operating in this mode at 3.3 V, further reducing power consumption. A monitor photodiode mounted in the laser package is used 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. A CONEXANT BUSINESS ™/#R

3 Gbps Laser Driver

KEY FEATURES > High-speed operation; suitable for applications up to 3 Gbps > DC- or AC-coupled modulation drive consumes significantly less power than competing solutions at 3.3 volts > Minimal external component count > Differential data and clock inputs minimize pattern-dependent jitter > Bias and modulation current monitor > Automatic laser power control,with programmable temperature compensation and ‘slow-start’

www.mindspeed.com/salesoffices General Information: U.S. and Canada: (800) 854-8099 International: (949) 483-6996 Headquarters –Newport Beach 4000 MacArthur Blvd. East Tower Newport Beach, CA 92660 Order# 500047A M01-0254 © 2001 Mindspeed Technologies™, a Conexant business. All rights reserved. Mindspeed and the Mindspeed logo are trademarks of Mindspeed Technologies. All other trademarks are the property of their respective owners. Although Mindspeed Technologies strives for accuracy in all its publications, this material may contain errors or omissions and is subject to change without notice. This material is provided as is and without any express or implied warranties,including merchantability,fitness for a particular purpose and non-infringement. Mindspeed Technologies shall not be liable for any special,indirect,incidental or consequential damages as a result ofits use. A CONEXANT BUSINESS ™/#R

Features

  • High-speed operation; suitable for applications up to 3 Gbps
  • Typical rise/fall times < 90 ps
  • DC- or AC-coupled modulation drive
  • Differential data and clock inputs minimize pattern-dependent jitter
  • Independently programmable laser bias and modulation currents
  • Bias current to 100 mAand modulation current to 85 mAat VCC = 3.3 V
  • Automatic laser power control,with programmable temperature compensation and ‘slow-start’
  • Bias and modulation current monitor
  • Operates with +3.3 Vsupply
  • Functionally compatible with MAX3869
  • Available in die form,BCC+24 or TQFP32

Applications

  • Short-reach SONET/SDH
  • Metro-reach SONET/SDH
  • Datacom modules
  • Telecom modules
  • Add/drop multiplexers Product Highlights RDOUT+ OUT- VCC R C SHUNT SHUNT DATA CLK CEN DIS ENA MONBIAS BIASI I MONMOD MOD OCA OCA OCA SET MPC FAIL MPCSET PD I R BIAS GNDA X100 X60 Failure Detect REF C CCV V MODSETR R R R TCSLOPE TCSTART O Q NOTE: BCC + 24 Package PD and MPC are common on Pin 13 BIAS MON and MOD are common on Pin 14MON SET CX02066 functional block diagram