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 LVDS outputs when its outputs are terminated with 50 ohms to ground.
FUNCTION | Externally-triggered complementary-output pulse generator |
TRIGGER | Rising-edge trigger, 50 Ω input impedance Threshold is user adjustable from -4 to +4 volts Threshold test point is provided |
PROPAGATION DELAY | 1 ns, nominal |
OUTPUT | Versions -1 and -2: User adjustable 0 to ± 750 mV (nominal, ± 675 mV, min) peak into 50 Ω loads; AC-coupled 5 Ω nom. source per output Version -3 User adjustable 0 to 375 mV (nominal, 340 mV, min) peak-peak LVDS into 50 Ω load; DC-coupled 50 Ω nom. source per output VoH = +1.15 V (nominal, fixed) VoL = +1.15 V to +0.75 V (nominal, adjustable) |
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 LVDS