MN346

The MN346 has the following features including Small 14-Pin DIP;Internal Hold Capacitor;Low Glitch 40mV;MIL-PRF-38534 Screening Optional.

MN346 is high-speed, adjustment-free track-hold amplifiers in small, 14-pin, hermetically sealed dual-in-line packages. Both units are complete with internal hold capacitor and incorporate a neutralization of track-to-hold charge offset that results in fast acquisition times and low pedestal errors.MN346 offers the circuit designer very fast acquisition times and the convenience of a one-component track-hold function at low cost. These track-holds find application in D/A deglitching, in high-speed data distribution systems and in high-speed, simultaneously-sampling or sequential data acquisition systems requiring high scan rates.Track-to-hold settling time refers to the time interval between the point at which a device is commanded from the track to the hold mode and the point at which the analog output (following a transient) settles to within a specified error band around its final value.Coupling between analog inputs and digital signals should be minimized to avoid noise pick-up. Care should be taken to avoid long runs or analog runs close to digital lines. Input and output signal lines should be kept as short as possible, and if external offset adjustment is used, the potentiometer should be located as close to the unit as possible. If offset adjust is not used, pins 7 and 9 should be left open.

Pedestal refers to the unwanted step in output voltage that occurs as a T/H is switched from the track to the hold mode. For many T/H's, pedestal amplitude is a function of input/output voltage level. For the MN346, pedestal is constant regardless of input/output level.MN346's track-mode offset error can be reduced to zero with a 5kS2 potentiometer connected between pins 7 and 9 with its wiper connected to +15V With the analog signal path grounded, the pot should be adjusted until the output equals zero volts. The pot can also be used to compensate for the effects of pedestal by performing the adjustment in the hold mode. This adjustment is normally made while continually switching from track to hold and observing the TlH output on a scope. This procedure will eliminate adjustment ambiguities resulting from output droop.