1385DX
12.5 Gbps 1:8 Demultiplexer w/ Latched Comparator Input (+3.3 V Supply)

Applications

• Broadband test and measurement
• Automated Test Equipment (ATE)
• Military / Aerospace Instrumentation
• Broadband Digital Cross-Connects

Features

• Selectable 1:8 DEMUX (to 12.5 Gbps)
• High-sensitivity latched comparator input
• Front-end bandwidth: 14 GHz typical
• Clock rates of DC to 12.5 GHz typical
• Differential, selectable-rate output clock, including half-rate
• Automatic synchronization of multiple 1385DX demultiplexers
• Low power consumption: 1.2 W typical
• Differential CML I/O with common mode adjust
• Single power supply: +3.3 V
• Available in 8 x 8 QFN

Description

The 1385DX is a broadband 1:8 demultiplexer (DEMUX) with a sensitive latched comparator input operating at bit rates from DC to 12.5 Gbps.  Its serial data input features a very sensitive, low-hysteresis latched comparator front-end with an analog bandwidth of 14 GHz.  The front end has specifications that are similar to the Inphi 13607CP latched comparator.

The 1385DX accepts a single external clock at up to 12.5 GHz that strobes the input signal into the latched comparator.  The clocks used for demultiplexing the input are generated internally.

The 1385DX's outpu clock frequency can be either 1/8^th that of the input clock (full-rate mode) or 1/16^th (half rate mode) as determined by the CLKSEL input.

The 1385DX includes a synchronization circuit that allows two or more DEMUXs to be automoatically synchronized.  This is achieved in a master/slave mode in which the slave DEMUX synchronizes to a signal (CK16) from the master.  Synchronization occurs within at most 152 periods of the input clock.

The high-speed data and clock I/O use current mode logic (CML) buffers and are provided with on-chip back-terminations.  A separate power supply input (VCCO) to the output buffers allows the output common mode voltage to be set as low as 1.6 V.  Control inputs are low-voltage CMOS/TTL.

The 1385DX operates from standard +3.3 V power supplies.  It is available in an 8 x 8 mm QFN package.  Evaluation boards are also available.

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