Analogue, Mixed Signal, LSI


Optical modulator drivers

29 May 2013 Analogue, Mixed Signal, LSI

Hittite has introduced two new optical modulator drivers.

The HMC6620BG is a dual-channel 32 Gbps Mach-Zehnder driver supporting the next generation of 40 Gbps and 100 Gbps metro and long-haul applications. It is offered in a compact BGA package with channel-to-channel isolation of >30 dB up to 30 GHz and optional top or bottom cooling capability to ease space constrained module designs.

The device offers features such as high gain across a wide frequency range, low power dissipation, compact size, integrated peak detector function, fast rise/fall time, and integrated bias-tee inductor. The driver provides 8 Vp-p saturated output swing up to 32 Gbps and features output swing cross point adjustment.

With a wide supply operating range from +5 V to +7 V, the HMC6620BG is an environmentally friendly product consuming only 0,9 W of power with output swing of 6 V and supply at +5 V.

The IC provides long-haul system designers with scalable power dissipation for varying output drive requirements. The integrated peak detector function enables monitoring and maintains a constant output swing from the modulator driver to help designers improve system lifetime margin. Integrated high-speed bias-tee eliminates the requirement for external components.

The HMC6620BG is rated for operation from -5°C to +85°C, provides up to 30 dB of gain, exhibits very low additive rms jitter of 300 fs and supports up to 32 Gbps operation. The output swing is adjustable from 5 Vp-p to 8,5 Vp-p. Detailed package design reduces the channel-to-channel skew to <1 ps. The device is housed in a 13,76 x 13 x 3,63 mm laminate substrate-based BGA surface-mount package with integrated ESD protection.

The second new IC, the HMC7150LP3DE, is a broadband driver amplifier for electro-absorption modulated lasers (EML) and supports data rates up to 28,3 Gbps to meet 100 Gb Ethernet system requirements.

The part provides module designers with scalable power dissipation for varying drive voltage characteristics of different modulators and the power consumption of the module can be set as low as 0,12 W to 0,5 W at 1,5 Vpp and 2,3 Vpp output amplitudes, respectively.

The HMC7150LP3DE supports a wide range of supply voltages from 3,3 V to 6 V and delivers excellent time domain performance. The output amplitude and cross-point can be adjusted via control pins and the input and output are 50 Ω matched. The IC is supplied in a leadless 3 x 3 mm surface mountable package.

For more information contact Andrew Hutton, RF Design, +27 (0)21 555 8400, sales@rfdesign.co.za, www.rfdesign.co.za



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