'Me Model 740 is a four channel, unity gain linear or logic fan-in/fan-out packaged in a single width NIM module. Four linear inputs allow summing of linear levels or pulses. Both inverted and noninverted output levels are produced simultaneously allowing very complex triggers to be fast and easy to develop. Direct coupling of all inputs and outputs eliminates the baseline shifts due to rate or duty cycle affects, while making the device useful for per- forming logic functions.

 INPUT CHARACTERISTICS

 general        Four LEMO connectors per channel, bipolar input; accepts

          positive or negative voltages.



 Impedance       50 ohms +/-2%, direct coupled input.



 Protection       Protected with clamping diodes, no damage will occur from

          transients of +/-100 Volts (+/-2 amps) for 1 usec or less duration.



 Reflections       Less than +/-4% for input risetime of 1 nsec.



 Overdrive Response     Recovery time of 20 nsec for a +/-10 Volt input.



 OUTPUT CHARACTERISTICS

 General        Six bridged LEMO output connectors per channel. Four non-

          inverted outputs and two inverted outputs-, low impedance

          voltage source output stage.



 Protection       Outputs can be continuously shorted to ground without suffer-

          ing damage.



 Output Voltage Swing     Bipolar outputs deliver over +/-2 Volts across four 50 ohm

          loads.



 DC  Offset      A front panel 15-turn potentiometer provides +/-500 mvolt

          adjustment. A front panel test point allows easy monitoring

          of the DC offset.

 GENERAL  PERFORMANCE

 Gain         Fixed gain of 1.0 +/-2% both inverted and noninverted.



 Stability       Better than +/-50 uVolt/'C from DC to 1 mHz, and +/-.05%/'C

          above 1 MHz.



 Linearity       +/-0.2% for +/-2 Volts across two 50 ohms loads or +/-1.5 Volts

          across four 50 ohm loads.



 Bandwidth       DC to 250 MHz, 3 db point 1 Volt peak to peak.

 Wideband Noise     Less than 400 uvolts RMS, referred to the input (15 nV/Hz^.5).



 Risetime        Typically 1. 3 nsec, for a 1 Volt output excursion.

 Crosstalk       Greater than 60 db, DC to 100 MHz.

 Power Supply Requirements   +6V @ 350 mA    +12V @ 160 mA

          -6V @ 350 mA    -12V @ 160 mA

          NOTE: All currents within NIM specification limits allowing

          full powered bin to be operated without overloading .