NIM MODEL 726 LEVEL TRANSLATOR

Description

The model 726 is a 16-channel level translator packaged in a single width NIM module. It simultaneously converts in any direction between NIM, TTL and ECL logic families. In addition, a logical "OR" is possible for the ECL input and the NIM/TTL input. The input to output is direct coupled with the output duration equal to the input duration. Each channel has a single input connector which accepts a fast negative NIM level with 50 ohm input impedance and a positive TTL level with 500 ohms impedance. This produces a positive TTL output capable of driving a 50 ohm load and a bridged NIM output that drives two 50 ohm loads. The NIM output stage is current-switching which allows pulse clipping and is protected from damage due to shorted cables. 



 Input Characteristics

 NIM/TTL   16 inputs, one per channel, LEMO style connector; accepts both

    negative NIM or positive TTL pulses or levels.

    NIM: 50 ohms impedance +/-10%; -500 mV threshold; input protected

    to +/-8 VDC.

    TTL: 500 ohms impedance +/-10%; +1.2 Volt threshold; input

    protected to +/-8 VDC.



 ECL Input   16 inputs, one per channel; 2 x 17-pin header with lock and eject

    feature; accepts complementary ECL inputs; removable 110 ohm

    input termination; 200 mV differential threshold.



 Output Characteristics

 NIM Outputs  Two NIM outputs per channel; bridged -32 mA current switching,

    LEMO style connectors; delivers one double amplitude NIM level or

    two normal NIM levels into 50 ohms; 1.5 nsec rise and fall times.



 TTL Output   One TTL output per channel, LEMO style connector; sources 45 mA

    to drive 50 ohm load or 1000 standard TTL loads, sink current of

    100 mA; able to drive 100 standard TTL loads. 3.5 nsec rise and fall

    times.



 ECL Output   Complementary ECL, one per channel; 2 x 17 pin header with lock

    and eject feature; drives two 110 ohm ECL loads or up to 30 daisy-

    chained loads. Normal ECL levels of -800 mV and -1.7 Volts, 2 nsec

    rise and fall times.





General Characteristics

Rate   DC to 150 MHz for NIM and ECL translation,

    DC to 100 MHz for TTL translation.



Minimum   4 nsec for NIM and ECL translation,

Pulse Widths  7 nsec for TTL translation.



Delay   NIM, TTL or ECL input to NIM or ECL output = 5 nsec.

    NIM, TTL or ECL input to TTL output = 10 nsec.



Power Requirements. 6V @ 350 mA,_- 6V @ 400 mA

    +12V @ 100 mA, -12V @ 170 mA

    +24V @ 60 mA, -24V @ 80 mA

     110 VAC @ 40 mA