The PRL-257-2 is an AC-coupled input, manually programmable, two phase frequency divider with two sets of complementary NECL outputs. It is capable of running at input frequencies in excess of 6.6 GHz.
It has a common divide-by-2 pre-scalar front end followed by two banks of independent manually programmable dividers, Φ1 and Φ2. The f/2 pre-scalar output is further divided by 1, 2, 4, or 8 for the Φ1 bank via D0 and D1 of a two-bit DIP switch, providing a maximum ratio of 16. It is divided by 2, 4, 8 or 16 for the Φ2 bank via D2 and D3 of a second two-bit DIP switch, providing a maximum ratio of 32. All outputs are synchronous with the input frequency and are square waves (50% duty cycle) suitable for driving long lines terminated into 50 Ω/-2 V or AC-coupled 50 Ω loads.
The PRL-257-2 is ideal for applications where a high frequency divider or pre-scalar is needed for triggering or down-sampling. The two phases of output enable applications requiring two different ratios from a common reference frequency, and the 1:2 fanout feature enables system synchronization and monitoring/triggering applications from a single reference clock source. Applications for the PRL-257-2 include data acquisition, test, measurement, R&D, and system integration.
The unit includes an AC adapter for ready-to-use convenience on the bench or in a system. All I/O connectors are SMA. The extruded aluminum housing is suitable for mounting with the optional brackets.
Fig. 2: PRL-257-2 Block Diagram
SPECIFICATIONS (0° C ≤ TA ≤ 35° C)*
|RIN||Input Resistance||50||Ω||AC Coupled|
|CC||Coupling Capacitor||0.08||0.10||0.12||µf||Input TC=50 µs|
|IDC1||DC Input Current, +8.5 V||+80||+100|
|IDC2||DC Input Current, -8.5 V||-285||-300||mA|
|VDC||DC Input Voltage||±7.5||±8.5||±12||V|
|VAC||AC/DC Adapter Input Voltage||103||115||127||V|
|VINmin||Minimum p-p Input Amplitude||500
|Sine Wave@ FMIN In I
Square Wave, tr < 2 ns
Square Wave, tr < 500 ps
|VINmax||Maximum p-p Input Amplitude||2.00||1.25||V||Sine or Square Wave|
|VOH||Output Hi Voltage @ 100 MHz||-1.13||-0.90||-0.81||V||Output terminated to 50 Ω/-2 V|
|VOL||Output Lo Voltage @ 100 MHz||-1.95||-1.60||-1.48||V||Output terminated to 50 Ω/-2 V|
|tPLH||Propagation Delay to Φ1 output ↑||2500||ps|
|tPHL||Propagation Delay to Φ1 output ↓||2500||ps|
|tr/tf||Rise/Fall Times (20%-80%)||200||250||ps||Note (1)|
|tSKEW1||Skew ↔ Φ1 or Φ2 outputs||40||120||ps|
|tSKEW2||Skew ↔ Φ1 and Φ2 outputs||40||120||ps||D0/D1=10, D2/D3=00|
|Jitter, p-p||5||10||ps||Note (2)|
|FMIN In I||Minimum Input frequency||120||100||MHz||Sine wave input|
|FMIN In II||Minimum Input frequency||150||100||KHz||Square wave input, tr < 2 ns|
|FMAX In I||Maximum Input frequency||6.0||6.6||GHz|
|FMAX Out1||Maximum Output frequency, Φ1||3.00||3.30||GHz||Φ1 outputs|
|FMAX Out2||Maximum Output frequency, Φ2||1.50||1.65||GHz||Φ2 outputs|
|Size||1.3 x 2.9 x 2.9||in.|
|Weight, excl. AC adapter||10||Oz.|
|Shipping weight, incl. AC adapter||4||lb.|