MIL-M-38510-121 Microcircuits, Linear Monolithic And Multichip, Silicon 12 Bit Digital-To-Analog ConvertersThis specification covers the detail requirements for monolithic silicon, bipolar, interface, memory core drivers. Two product assurance classes and a choice of case outlines and lead finishes are provided and are reflected in the complete part number. For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.3

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MIL-M-38510/121A

NOTES:

1. Unless otherwise specified, all capacitors are 47 μF ceramic.

2. The bandwidth of the oscilloscope main frame must be at least 500 MHz.

3. The plug-in, given a 400 mV to 0 input pulse, must recover to 0.5 mV on the 1 mV/cm gain range within

100 ns.

4. See figure 4 for details of the settling time amplifier. For proper readings, the input FET's (Q1, Q2) and the output FET's (Q4, Q5) must be balanced by the following procedure:

a. With the DUT removed from the socket, measure the gate voltage of Q1 with a DVM while adjusting the

2 kν trim potentiometer for a reading of 0 V.

b. Connect the (+) and (-) output jacks to a differential comparator scope preamp. Next, zero the scope

display with the scope switch on "GND". Short the Schottky diodes out and adjust the 5 kν potentiometer so that the differential output display is in the ground reference position, with the scope switch on "DC".

5. Calibrate the scope display by installing a DUT and applying a 4 V, 100 kHz square wave to the logic

inputs. With the plug-in controls set to 200 mV/cm and 20 μs/cm, set the variable supply to 12.5 V and adjust the 10 kν pot until the amplifier output has its maximum amplitude. It should be a square wave approximately ±200 mV symmetrical about zero volts.

Measurement procedure:

1. Set the variable supply to 15 V and adjust the 10 kν pot such that the bottom of the square wave is at zero volts. Note that at 0 V the Schottky diodes are not clamping.

FIGURE 3. Test circuit for settling time - Continued.