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E737ATF Datasheet(PDF) 8 Page - Semtech Corporation |
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E737ATF Datasheet(HTML) 8 Page - Semtech Corporation |
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8 / 18 page  © 2007 Semtech Corp. / Rev. 6, 2/20/07 www.semtech.com TEST AND MEASUREMENT PRODUCTS E737 Circuit Description (continued) REXT Selection The E737 is designed for the voltage drop across RA, RB, RC, and RD to be ≤2V with the maximum current passing through them. However, these resistor values can be changed to support different applications. Increasing the maximum current beyond the nominal range is not recommended. However, decreasing the maximum current is allowed. Short Circuit Protection The E737 is designed to survive a direct short circuit to any voltage within the supply rails at the FORCE and SENSE pins. Transient Clamps The E737 has on-board clamps to limit the voltage and current spikes that might result from either changing the current range or changing the operating mode. Common Mode Error/Calibration In order to attain a high degree of accuracy in a typical ATE application, offset and gain errors are accounted for through software calibration. When forcing or mea- suring a current with the E737, an additional source of error, common mode error, should be accounted for. Common mode error is a measure of how the common mode voltage, V CM, at the input of the current sense amplifier affects the forced or measured current values (see Figure 2). Since this error is created by internal resistors in the current sense amplifier, it is very linear in nature. Using the common mode error and common mode linearity specifications, one can see that with a small number of calibration steps (see Applications note PMU-A1), the effect of this error can be significantly reduced. Compensation Capacitors COMP1 and COMP2 are internal op amp compensa- tion pins that require a 120 pF capacitor connected be- tween the two pins. CAPI is an external noise compensation pin that can be used as a low pass filter to eliminate noise from the IVIN and VINP input pins through the connection of an external capacitor from CAPI to GND. The relation- ship between the roll-off frequency of noise filtered (in Hz) to the external capacitance (in farads) can be seen below: Filter Frequency = CA and CB are internal compensation pins that require a 120 pF capacitor connected between them. Power Supply Sequencing In order to help protect the E737 from a latch-up condi- tion, it is important that VCC All Input Voltages ≥ VEE, and VCC ≥ GND ≥ VEE at all times. 1 80,000 π X C CAPI Figure 2. Graphical Representation of Common Mode Error –5V 7V VOS@IVMON VCM@FORCE CM Error = Slope CM Linearity |
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