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AD1315KZ Scheda tecnica(PDF) 6 Page - HANAMICRON |
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AD1315KZ Scheda tecnica(HTML) 6 Page - HANAMICRON |
6 / 8 page AD1315 –6– REV. A FUNCTIONAL DESCRIPTION The AD1315 is a complete high speed active load designed for use in general purpose instrumentation and digital functional test equipment. The function of the active load is to provide independently variable source and sink currents for the device to be tested. The equivalent circuit for the AD1315 is shown in Figure 11. An active load performs the function of loading the output of the device under test with a programmed IOH or IOL. These currents are independently programmable. VCOM is the commu- tation voltage point at which the load switches from source to sink mode. The active load may also be inhibited, steering cur- rent to the IOLRTN and IOHRTN pins, effectively disconnecting it from the test pin. The AD1315 accepts differential digital signals at its inhibit inputs ensuring precise timing control and high noise immunity. The wide inhibit input voltage range allows for ECL power supplies of –5.2 V and 0 V, –3.2 V and +2 V, and 0 V and +5 V. Where speed and timing accuracy are less important, TTL or CMOS logic levels may be used to toggle the Inhibit inputs of the AD1315. Single ended operation is possible by biasing one of the inputs to approximately +1.3 V for TTL or VCC/2 for CMOS. Care should be taken to observe the 4 V maximum allowable input voltage. The IOH and IOL programming inputs accept 0 V to +5 V analog inputs, corresponding to 0 to 50 mA output currents. The VCOM input, which sets the IOH/IOL switch point, may be set anywhere within the input range of –2 V to +7 V. Figure 11. Block Diagram VDUT VOLTAGE RANGE In Figure 12, VDUT range, IOH and IOL typical current maxi- mums are plotted versus DUT voltage. In the IOH mode (VDUT higher than VCOM), the load will sink 50 mA, until its output starts to saturate at approximately –1.5 V. In the IOL mode (VDUT lower than VCOM), the load will source 50 mA until its output starts to saturate at approximately +5.5 V. At +7 V, the source current will be close to zero. Figure 12. Allowable Current Range for IOH, IOL vs. VDUT Ideally, the commutation point set at VCOM would provide in- stantaneous current sink/source switching. Because of I/V characteristics of the internal bridge diodes, this is not the case. To guarantee full current switching at the DUT, at least a 1 volt difference between VCOM and VDUT must be maintained in steady state conditions. Because of the relatively fast edge rates exhibited by typical logic device outputs, this should not be a problem in normal ATE applications. INHIBIT MODE LEAKAGE The AD1315’s inhibit-mode leakage current changes with both temperature and bias levels. There are two major contributing effects: transistor reverse-bias collector-base leakage and reverse leakage in the Schottky-diode bridge. Leakage variations with VDUT arise primarily from transistor collector-base leakage, while both effects contribute to leakage current temperature variations. Inhibit-mode leakage is weakly dependent on VCOM and decreases slightly as the difference between VDUT and VCOM is reduced. Figure 8 shows typical AD1315 inhibit leakage cur- rent as a function of VDUT and temperature. THERMAL CONSIDERATIONS The AD1315 is provided in a 0.550" 0.550", 16-lead (bottom brazed) gull wing, surface mount package with a θ JC of 10 °C/W (typ). Thermal resistance (case-to-ambient) vs. air flow for the AD1315 in this package is shown in Figure 13. The data pre- sented is for a ZIF socketed device. For PCB mounted devices (w/30 mils clearance) the thermal resistance should be ~3 to 7% lower with air flows below 320 lfm (1). Notice that the improve- ment in thermal resistance vs. air flow starts to flatten out just above 400 lfm(2). NOTES 1Ifm is air flow in linear feet/minute. 2For convection cooled systems, the minimum recommended airflow is 400 lfm. Figure 13. Case-to-Ambient Thermal Resistance vs. Air Flow |
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