The PRL-220A is a self-contained high-speed TTL frequency divider capable of operating at clock frequencies in excess of 100 MHz. The PRL-220A has ÷2, ÷4, ÷8 and ÷16 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 outputs are square waves, 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)*
|RIN (Lo)||Input Resistance||49.5||50.0||50.5||Ω|
|RIN (Hi)||Input Resistance||495||500||505||Ω|
|IDC||DC Input Current||200||225||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.|
*All AC measurements are made with all outputs terminated into 50 Ω