The PRL-450 series of logic translators converts ECL
signals to TTL signals:
PRL-450LPD, translates LVPECL to TTL
PRL-450ND, translates NECL to TTL
PRL-450PD, translates PECL to TTL
Each unit can receive either
single ended or differential input signals, selected by a switch. The outputs
of these translators have 50 Ω back terminations, and, therefore, they drive
50 Ω terminated or unterminated lines. These high speed translators facilitate
testing of high speed digital communications circuits, where conversion
of ECL and PECL clock and data signals to TTL level signals is often required.
The PRL-450ND is designed to interface with NECL circuits
operating with a -5.2 V or -4.5 V supply, and the PRL-450PD is designed
to interface with PECL circuits operating with a +5 V supply, while the PRL-450LPD is designed
to interface with Low-Voltage LVPECL circuits operating with a +3.3 V
In the differential
input mode, both inputs D and D
of the PRL-450ND are terminated into 50 Ω/-2 V, and those of the PRL-450PD
into 50 Ω/+3 V or 50 Ω/+1.3 V for the PRL-450LPD. In this mode, 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. The D
inputs are switched internally to VBB, nominally -1.3 V for
the PRL-450ND, +3.7 V for the PRL-450PD, and +2.0 V for the PRL-450LPD.
The termination resistors, RT, for the
D input channels are changed
to 62 Ω.
Each unit is supplied with a ±8.5 V AC/DC Adapter and housed
in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure.