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DescriptionThe PRL-240A is a self-contained high-speed TTL frequency divider capable of operating at clock frequencies in excess of 100 MHz. The PRL-240A has ÷2 and ÷10 outputs. The input resistance can be set to 500 Ω or 50 Ω by a toggle switch. A functional block diagram is shown in Fig.1. The back-matched 50 Ω outputs can drive long lines and deliver greater than 2.2 V into 50 Ω loads. The ÷2 output is a square wave, and the ÷10 output has an output positive pulse width equal to the input pulse period. The square wave is useful for testing High and Low pass filters. The divider outputs are useful as 'scope triggers for viewing multi-frequency signals. The ÷2 signal is often needed as a control signal for split-cycle timing applications. Each unit is housed in an attractive 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and has BNC I/O connectors. A ±8.5 V AC/DC Adapter is supplied with each unit. |
(0° C ≤ TA ≤ 35° C)*
| Symbol | Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|---|
| RIN (Lo) | Input Resistance | 49.5 | 50.0 | 50.5 | Ω | |
| RIN (Hi) | Input Resistance | 495 | 500 | 505 | Ω | |
| IDC | DC Input Current | 135 | 180 | mA | ||
| VDC | DC Input Voltage | 7.5 | 8.5 | 12 | V | |
| VAC | AC/DC Adapter Input Voltage | 103 | 115 | 127 | V | |
| VIH | Input Hi Level | 2.0 | 2.5 | 5.0 | V | |
| VIL | Input Lo Level | -0.5 | 0.0 | 0.5 | V | |
| VOH | Output Hi Level | 2.2 | 2.5 | V | 50 Ω | |
| 4.8 | 5.0 | V | 1 M Ω | |||
| VOL | Output Lo Level | 0.15 | 0.25 | V | 50 Ω | |
| 0.30 | 0.50 | V | 1 M Ω | |||
| TPLH | Propagation Delay to f/n↑ output | 10 | 13 | ns | ||
| TPHL | Propagation Delay to f/n↓ output | 10 | 13 | ns | ||
| tr | Rise Time (10%-90%) | 2.0 | 3.0 | ns | ||
| tf | Fall Time (10%-90%) | 1.8 | 3.0 | |||
| TSKEW | Skew between outputs | 1 | 2 | ns | ||
| FMAX | Max clock frequency | 100 | MHz | |||
| Size | 1.3 x 2.9 x 2.9 | in. | ||||
| Shipping weight, incl. AC adapter | 4 | lb. | ||||
