AD1315

The AD1315 is a complete, high speed, current switching load designed for use in linear, digital or mixed signal test systems. By combining a high speed monolithic process with a unique surface mount package, this product attains superb electrical performance while preserving optimum packaging densities in an ultrasmall 16-lead, hermetically sealed gull wing package.

Featuring current programmability of up to +50 mA, the AD1315 is designed to force the device under test to source or sink the programmed IOHPROG and IOLPROG currents. The IOH and IOL currents are determined by applying a corresponding voltage (5 V = 50 mA) to the IOH and IOL pins. The voltageto- current conversion is performed within the AD1315 thus allowing the current levels to be set by a standard voltage out digital-to-analog converter.

The AD1315's transition from IOH to IOL occurs when the output voltage of the device under test slews above or below the programmed threshold, or commutation voltage. The commutation voltage is programmable from 2 V to +7 V, covering the large spectrum of logic devices while able to support the large current specifications (48 mA) typically associated with line drivers. To test I/O devices, the active load can be switched into a high impedance state (Inhibit mode) electrically removing the active load from the path through the Inhibit mode feature. The active load leakage current in Inhibit is typically 20 nA.

The Inhibit input circuitry is implemented utilizing high speed differential inputs with a common-mode voltage range of 7 volts and a maximum differential voltage of 4 volts. This allows for the direct interface to the precision of differential ECL timing or the simplicity of switching the Active Load from a single ended TTL or CMOS logic source. With switching speeds from IOH or Io~ into Inhibit of less than 1.5 ns, the AD1315 can be electrically removed from the signal path "on-the-fly."

The AD1315 is available in a 16-lead, hermetically sealed gull wing package and is specified to operate over the ambient commercial temperature range from 0°C to +70°C.