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DescriptionThe PRL-425N is a dual channel, universal input, differential receivers with NECL outputs. The floating 100 Ω inputs are designed for interfacing with differential signals within the common mode range of -2.4 V to +4.0 V. Therefore, they are compatible with LVDS, RS422, LVPECL, LVTTL/CMOS, NECL, PECL or TTL differential input signals. The PRL-425N has complementary NECL outputs for driving 50 Ω loads terminated to -2 V, floating 100 Ω loads or AC-coupled 50 Ω loads. It is also a long line driver, designed specifically for use with high speed data communications applications. Functional block diagrams of these devices are shown in Fig. 1 and Fig. 2. Model numbers with suffix TR, such as PRL-425NTR, have Triax input connectors instead of SMA input connectors. The PRL-425N is housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure, and each is provided with a ±8.5 V AC/DC Adapter. Optional mounting brackets are available. |
(0° C ≤ TA ≤ 35° C)*
| Symbol | Parameter | PRL-425N | UNIT | Notes | ||
|---|---|---|---|---|---|---|
| Min | Typ | Max | ||||
| RinD | Differential Input Resistance | 95 | 100 | 105 | Ω | |
| RinC | Common Mode Input Resistance | 5K | Ω | |||
| IDC1 | DC Input Current, +8.5 V | 30 | 40 | mA | ||
| IDC2 | DC Input Current, -8.5 V | -130 | -150 | mA | ||
| VDC | DC Input Voltage | ±7.5 | ±8.5 | ±12 | V | |
| VAC | AC/DC Adapter Input Voltage | 103 | 115 | 127 | V | |
| VOHNL | Output Hi Level, No Load | -0.85 | V | 50 Ω/-2 V | ||
| VOHFL | Output Hi Level, Full Load | -1.05 | -0.95 | -0.75 | V | |
| VOLNL | Output Lo Level, No Load | -1.65 | V | 50 Ω/-2 V | ||
| VOLFL | Output Lo Level, Full Load | -1.95 | -1.75 | -1.6 | V | |
| tPLH | Propagation Delay to output ↑ | 1500 | ps | |||
| tPHL | Propagation Delay to output ↓ | 1500 | ps | |||
| tr/tf | Rise/Fall Times1 (20%-80%) | 500 | 850 | ps | ||
| fMAX1 | Maximum Clock Frequency SMA2 | 1500 | 1800 | MHz | ||
| fMAX2 | Maximum Clock Frequency Triax3 | 500 | 625 | MHz | ||
| tSKEW1 | Skew between outputs | 50 | 200 | ps | ||
| tSKEW2 | Skew from unit to unit | 100 | 400 | ps | ||
| VCM | Input Common Mode Voltage | -2.4 | +4.0 | V | ||
| Size | 1.3 x 2.9 x 3.9 | in. | ||||
| Weight, w/o AC adapter | 7 | Oz | ||||
| Shipping weight, w/AC adapter | 4 | lb. | ||||
Notes:
(1). The NECL 50 Ω output rise and fall times (20%-80%) are measured with both the Q and Q outputs terminated into 50 Ω/-2 V. If one output is not terminated, both the rise and fall times will increase by approximately 15%, and output waveform degradation will occur. The TTL outputs rise and fall times (10%-90%) are measured with ground referenced 50 Ω terminations, and it is not necessary to terminate an unused output.
(2). fMAX I is measured by dividing the outputs by four, using the PRL-255N, ÷2 and ÷4 frequency divider module, and then measured using the PRL-550NQ4X, four channel ECL Terminators, connected to a sampling 'scope.
(3) Units with the Trompeter CBBJR79 Triax input connectors are tested using the PRL-433N, complementary NECL input to Differential NECL output translator, and the Trompeter PCGOW10PCG-36 shielded twisted pair cables. Specified fmax is limited to 625 MHz due to test equipment limitations, not due to any inherent limitation in the Triax connector
All PRL products with Triax connectors use Trompeter P/N CBBJR79, Right Angle Circuit Board Bulkhead Jack, 3-lug (Numbered page 10, document page 11 of 142). Any Trompeter 70-series Triax Cable Plug with 3 lugs (e.g. PL75-9, 3-lug) will mate with CBBJR79.
While we believe these models to be accurate, no representations are made as to accuracy or suitability for any application:
PRL-425N:
