The PRL-420LPD translator converts TTL/CMOS logic to LVPECL levels.
Each unit has a switch-selectable 1.5 V or 1 V input threshold voltage with a fixed 50 Ω input termination. The complementary LVPECL outputs from the PRL-420LPD are suitable for driving 50 Ω loads terminated to +1.3 V. The outputs can also drive AC-coupled or floating 50 Ω loads.
These Logic Level Translators are designed specifically for use in testing and interfacing of high speed digital communications circuits, where conversions from TTL/CMOS level signals to LVPECL level signals are often required. They are ideal building blocks that complement other PRL Logic Level Translators, such as the PRL-450ND, PRL-450PD, PRL-460NPD and PRL-460PND, etc. in systems integration applications where interconnections of mixed logic signals are often necessary.
(0° C ≤ TA ≤ 35° C)*
|VTOSH||Input Threshold Voltage (High)||1.4||1.5||1.6||V|
|VTOSL||Input Threshold Voltage (Low)||0.9||1.0||1.1||V|
|VOL||Output Low Level||1.5||1.7||1.8||V|
|VOH||Output High Level||2.3||2.5||2.7||V|
|IDC1||DC Input Current, +8.5 V||135||200||mA|
|IDC2||DC Input Current, -8.5 V||-325||-350||mA|
|VDC||DC Input Voltage||±7.5||±8.5||±12||V|
|VAC||AC/DC Adapter Input Voltage||103||115||127||V|
|tPLH||Propagation Delay to output||2||ns|
|tPHL||Propagation Delay to output||2||ns|
|tr/tf(1)||Rise/Fall Times (20%-80%)||1100||1250||ps|
|tSKEW2||Skew: VO1↑↔ VO2↑||200||500||ps|
|Max Clock Frequency
Input Threshold Voltage (High)
|Max Clock Frequency
Input Threshold Voltage (Low)
|Size||1.3 x 2.9 x 3.9||in.|
|Weight, excl. AC adapter||7||Oz|
|Shipping weight, incl. AC adapter||4||lb.|
*Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω /+1.3 V.
The output rise and fall times are measured with with all inputs terminated into 50 Ω/VTT. For best performance all outputs should be terminated into 50 Ω/VTT or else AC- coupled into 50 Ω loads. If a single output is used, its complement must be terminated; otherwise output waveform distortion will occur. If one pair of complementary outputs is used, the other complementary pair may remain unterminated. Use the PRL-550LPQ4X, four channel LVPECL Terminator, for the 50 Ω/VTT termination and for connection of LVPECL signals to 50 Ω input oscilloscopes. The PRL-ACT-50, Dual Channel AC-Coupled 50 Ω Terminator, may also be used to provide the 50 Ω/VTT termination. If preservation of DC levels is not required, then the PRL-SC-104, 0.1 µf DC block or a 12 dB AC-coupled attenuator may be used to connect the LVPECL outputs to 50 Ω input instruments.