HMC674LP3E Datasheet, PDF (5/10 Pages) Hittite Microwave Corporation – 10 GHz LATCHED COMPARATOR WITH RSPECL OUTPUT STAGE

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HMC674LP3E
10 GHz LATCHED COMPARATOR
WITH RSPECL OUTPUT STAGE
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Operational Description
The HMC674LP3E is a Latched Comparator with 10 GHz equivalent input bandwidth. The device is comprised of three
blocks: 1) An input amplifier, 2) A latch, and 3) An RSPECL Output Buffer. The latching circuit is level sensitive, and
consists of a single high-speed latch. The HMC674LP3E comparator supports 10 Gb/s operation. The minimum input
data latching pulse width is 60 ps.
The HMC674LP3E operates in either Track (Transparent) Mode, where the output follows the logical value of the input, or
the Latch (Hold) Mode, where the output value is held to the logical value of the comparison result of the input just prior
to (LE - LE_bar) going HI. Track Mode operation is selected by either 1) (LE - LE_bar) LO, or 2) LE and LE_bar inputs
floating. Latch Mode is selected by (LE - LE_bar) HI. The input impedance of the LE and LE_bar inputs is 8 k ohms, but
these inputs can be terminated with 50 ohm external resistors if desired.
When DC coupled, the clock inputs operate at an input common mode voltage of 2 V. In this case, any termination
resistors would ideally be returned to 2 V. If the clock is AC coupled to the device, the input termination resistors can be
returned to ground.
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For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: [phone] Fax: [phone] Order On-line at www.hittite.com
Application Support: Phone: [phone] or [e-mail]