PRL-480N Dual Channel Programmable NECL
The PRL-480N has been discontinued, and no new orders will be
accepted. The following information is for reference only. We are
working on an improved programmable delay module, and we
welcome your input regarding desired features, specifications, etc.
The PRL-480N is a dual channel programmable NECL Delay
module. It is intended for clock de-skewing and critical timing adjustment
in high speed logic circuit testing, and it has a maximum clock frequency
of 1.2 GHz. The outputs of the two channels can be connected to an AND gate,
such as the PRL-435, for generating
sub-nanosecond pulse width signals.
The delay of each channel can be individually
programmed using a seven-position DIP-switch and a channel selector switch.
The input of each channel can be driven either differentially or single
ended. A switch selects either single-ended or differential inputs, as shown
in Fig. 1. In the differential input mode, both
inputs D and D are terminated
internally into 50 Ω/-2 V, and, therefore, either one or both inputs can
accept AC coupled signals as well. In the single input mode, signals should
be connected to the D inputs only. Inputs D are switched internally to VBB,
nominally -1.3 V, and termination resistors RT's for the D input
channels are changed to 62 Ω. Complementary outputs of the PRL-480 are designed
for driving 50 Ω loads terminated into -2 V. With internal pull-down resistors,
these outputs can also be AC coupled for driving 50 Ω loads terminated to
ground or to other voltages, such as +3 V for PECL circuits.
The PRL-480 is housed in a 1.3 x 2.9
x 3.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V/750
mA AC/DC Adapter.
**All prices are for U.S. orders only. For export
orders, please add 15%. Prices subject to change without notice. Please
consult factory for additional information at +1-310-515-5330 or