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DescriptionThe PRL-425QRT is a four channel, differential input receiver with single-ended 50 Ω TTL output line drivers. It is intended for converting differential signals transmitted through long lines into single-ended TTL outputs. The floating 124 Ω inputs are designed to be compatible with RS-422 or TTL differential input signals. They can also accept source-biased PECL or LVPECL inputs. The 50 Ω back-terminated TTL output line drivers can drive long lines with or without terminations, and they are designed specifically for use with high speed data communication applications. Fig. 1 shows the standard RS-422 input configuration. A functional block diagram of this device is shown in Fig. 2. Each PRL-425QRT is supplied with a 8.5 V/1.8 A AC/DC Adapter, but it can also operate from a single positive power supply in the range of 7.5 V to 12 V. The PRL-425QRT is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure. Available accessories include TTL Fanout modules, voltage distribution modules, brackets for mounting multiple units, and a rackmount enclosure kit for rapid system integration. |
SPECIFICATIONS (0° C ≤ TA ≤ 35° C)*
| Symbol | Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|---|
| RIND | Differential Input Resistance | 124 | Ω | |||
| RINC | Common Mode Input Resistance | 5K | Ω | |||
| IDC1 | DC Input Current @ 50 MHz | 265 | 280 | mA | ||
| IDC2 | DC Input Current @ 85 MHz | 340 | 360 | mA | ||
| VID | Differential Input(1) | V | ||||
| VIA | Single ended input(1) | V | ||||
| VCM | Common Mode Input(1) | -2.5 | 5.0 | V | ||
| VDC | DC Input Voltage | 7.5 | 8.5 | 12.0 | V | |
| VAC | AC/DC Adapter Input Voltage | 103 | 115 | 127 | V | |
| VOHNL | Output Hi Level, No Load | 4.4 | 5.0 | V | RL=1 MΩ @ DC | |
| VOHFL | Output Hi Level, Full load | 2.2 | 2.5 | V | RL=50 Ω @ DC | |
| VOLNL | Output Lo Level, No Load | -0.1 | 0.0 | 0.4 | V | RL=1 MΩ @ DC |
| VOLFL | Output Lo Level, Full Load | -0.05 | 0.00 | 0.20 | V | RL=50 Ω @ DC |
| TPLH | Propagation Delay to output ↑ | 2.2 | ns | |||
| TPHL | Propagation Delay to output ↓ | 2.2 | ns | |||
| tr | Rise Time (10%-90%) | 1.8 | 2.5 | ns | ||
| tf | Fall Time (10%-90%) | 1.8 | 2.5 | ns | ||
| TSKEW | Skew between any 2 outputs | 250 | 600 | ps | ||
| FMAX1 | Max. Clock Frequency(2) | 70 | 75 | MHz | ||
| DTY | Positive Duty Cycle @ 50 MHz | 55 | % | ↑ Input | ||
| Size | 1.3 x 2.9 x 2.9 | in | ||||
| Weight, excluding AC adapter | 5 | Oz | ||||
| Shipping weight, Including AC adapter | 4 | lb | ||||
(1): See Fig. 1
