Electronic Design

IC Pair Improves Jitter Performance With 2-ps Maximum Generation

The TQ8214 and TQ8224 are a pair of 2.488-Gbit/s OC-48/STM-16 ICs. Both devices feature a user-programmable, 16-/8-bit-wide PECL data bus interface. This enables them to be used in legacy systems that need better jitter performance or in new systems employing the latest PECL interface OverHead processors. The TQ8214 multiplexer incorporates high-performance PLL-based clock synthesis, along with a fully back-terminated 50-Ω, 10- to 75-mA laser driver (or a 0.5- to 3.75-V electro-optical modulator driver).

The TQ8214 has 1-ps typical and 2-ps maximum jitter generation while simultaneously providing compliant jitter-transfer characteristics at any available reference clock frequencies. The clock synthesis, multiplexer, and driver combination meets the SONET/SDH-system maximum jitter generation specification of 4 ps and the jitter transfer specification of less than 0.1-dB peaking and 2-MHz bandwidth. The TQ8224 demultiplexer features a PLL-based clock and data-recovery function. Its high-speed serial inputs accept differential or single-ended PECL or analog inputs with 40-mV sensitivity.

Fully compliant with ANSI, Bellcore, and ITU jitter requirements, both devices come in a 23-mm, 208-pin, TBGA JEDEC thermally enhanced plastic package. The TQ8214 costs $119.10, while the TQ8224 is $125.25, in 1000-unit-per-year quantities. Prototype quantities and evaluation boards are available now.

TriQuint Semiconductor, 2300 N.E. Brookwood Pkwy., Hillsboro, OR 97124; (503) 615-9000; fax (503) 615-8900; Internet: www.triquint.com.

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