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EVM4257ALPT Datasheet(PDF) 10 Page - Semtech Corporation |
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EVM4257ALPT Datasheet(HTML) 10 Page - Semtech Corporation |
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10 / 39 page  10 2005 Semtech Corp. / Rev. 5, 11/30/05 TEST AND MEASUREMENT PRODUCTS E4237/E4257/E4287 www.semtech.com Circuit Description Circuit Overview E42X7 is a family of dual channel parametric test and measurement units, each of which can: • Force Voltage/Measure Current • Force Current/Measure Voltage • Force Voltage/Measure Voltage • Force Current/Measure Current Each PMU channel can force or measure voltage over a 16.25V range and force or measure current over four distinct ranges: E4257, E4287 E4237 ± 40 µA ± 40 µA ± 400 µA ± 4 mA ± 4 mA ± 40 mA The E42X7 also features integrated voltage clamp/over- voltage detection circuitry that provides over-voltage protection to the DUT (Device Under Test) during normal operation. Short-circuit protection circuitry protects the E42X7 by limiting the maximum output current to a specified value over the full-scale current for a particular range. The E4287 features an integrated analog MUX that is intended to be used to toggle the “driver high level” supplied to a pin electronics driver between normal logic levels and a super voltage level which is suitable for programming devices that require a “third-level” such as FLASHTM. The E4287 also features a pin (per channel), GUARD, which can be used to drive the guard traces of a FORCE/ SENSE pair. By surrounding FORCE and SENSE traces with guard traces which connect to the GUARD pin, an effective method to achieve minimal leakage can be achieved. The E42X7 also includes a test head ground (DUTGND) referencing features which allow the force voltage function to be referenced to a separate ground reference other than the ground (GND) power used for the device. Also included with the E42X7 are a number of integrated switches that allow the device to be configured to: • Connect a central “system” PMU to the DUT through the FORCE and SENSE pins of the E42X7. • Provide a ~4.5K Ω pull-up resistor to the programmed force voltage level, which allows devices with unipolar open-element outputs (i.e., open drain) to be tested without providing a designated pull-up or pull-down on a load board. PPMU Functionality The trapezoid in Figure 1 describes the V/I functionality of the E42X7’s internal PMU when a DUT is connected to the FORCE or RF pins (a functional schematic of the E42X7 can be viewed in Figure 2). Figure 1. PMU Functionality/Range at the FORCE and RF Pins RF Pin, All Ranges FORCE Pin, Ranges A,B,C (E4257, E4287) FORCE Pin, Range D (E4257, E4287) FORCE Pin, Range C (E4237) Output Current [% Full-Scale Range] VCC – 2V VCC – 4V VEE + 2V VEE + 4V +100% –100% Output Voltage [V] |
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Similar Description - EVM4257ALPT |
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