The J240 is an externally-triggered pulse generator with complementary outputs and adjustable trigger levels.
The J240-1 version outputs 140 picosecond FWHM complementary Gaussian pulses at the rising edge of the trigger input. A trimpot adjusts the amplitude from zero to 750 mV peak. AC-coupled outputs.
The J240-2 driver output follows the input and the WIDTH pot is inoperative. AC-coupled outputs.
The J240-3 is a DC-coupled signal follower which provides LVPECL outputs when its outputs are terminated with 50 ohms to ground.
|FUNCTION||Externally-triggered complementary-output pulse generator|
|TRIGGER|| Rising-edge trigger, 50Ω input impedance
Threshold is user adjustable from -4 to +4 volts
Threshold test point is provided
|PROPAGATION DELAY||1 ns, nominal|
|OUTPUT|| User adjustable amplitude 0 to ± 750 mV nominal (± 650 mV min) (50Ω load)
Nominal 5Ω output impedance
J240-1 and -2 are AC coupled
J240-3 is DC coupled LVPECL
|BANDWIDTH||DC to 1 GHz repetition rate|
|RISETIME||65 ps, nominal (20% to 80%)|
|FALLTIME||65 ps, nominal (20% to 80%)|
|PULSEWIDTH|| Factory adjusted to 140 ps FWHM, nominal (J240-1)
J240-2 and -3 widths follow the input
|JITTER||< 10 ps RMS|
|OPERATING TEMPERATURE||0 to 60°C; extended MIL/COTS ranges available|
|CALIBRATION INTERVAL||One year|
|POWER||+12 volts at 150 mA, max|
|CONNECTORS|| Gold plated SMA input and output jacks standard; (SMB optional)
Trigger Threshold level test point
2.1 mm X 5.5 mm barrel power connector
|INDICATOR||LED: green power|
|PACKAGING||3.3" (L) x 2.1" (W) x 0.9" (H) extruded anodized aluminum enclosure|
J240-1: single-channel compact pulse generator with 130 ps nominal Gaussian pulse outputs and rising-edge trigger
J240-2: single-channel compact pulse generator/input follower with 60 ps nominal 20:80 rise/fall time
J240-3: single-channel compact pulse generator/input follower with 60 ps nominal 20:80 rise/fall time LVPECL