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SN74AHC1G08DBVR Datasheet(PDF) 7 Page - Texas Instruments |
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SN74AHC1G08DBVR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 35 page www.ti.com Overview 1.2 Recommended Starter System The Multi-Cal-System starter system is an eight-channel system for calibrating PGA308 and PGA309 sensor modules automatically. The starter system allows you to verify that the Multi-Cal-System meets your specific application requirements. You can expand the capacity of your system later by adding slave boards. Each slave board adds another eight channels, for a maximum system capability of 64 channels (one master and seven slave boards). Table 1 describes the recommended starter system and lists the quantities of each board required. Table 1. Recommended Starter System Quantity Name Comments 1 Multi-Cal-Master EVM This basic board gives you eight channels. You may choose to build your own cable because of cable length requirements. The 2 Multi-Cal-Interface cable construction of the cable is given in the Multi-Cal System Cable user 's guide (SBOU092). You may choose to build your own cable because of cable length requirements. The 1 Multi-Cal-Power cable construction of the cable is given in the Multi-Cal System Cable user 's guide (SBOU092). Depending on the mechanical requirements of 1 Multi-Cal-Interface EVM your specific system, you may develop your own interface board. Two Multi-Cal-Test EVMs allow you to check two channels. This option is typically enough 2 Multi-Cal-Test EVM (1) for initial evaluation of the system. Eight units would allow you to fully test all eight channels of the starter system. (1) The Multi-Cal-Test EVM board uses the PGA308. The equivalent PGA309 test board does not exist at the time of this writing; it is currently under development. There are also several additional pieces of test equipment required; Table 2 summarizes this equipment. Table 2. Additional Test Equipment Required Name Comments This is power for the multiplexers on the Multi-Cal-Master board. This supply can range from ±12 V to ±16 V. Choose a low-noise linear supply for best performance. This supply also powers slave boards if you expand the system in the future. Keep in mind the current output capability. ±15V Supply Current requirement for Master = 150 mA Current for each Slave = 150 mA Example: For eight channels and one master = 150 mA Example: For 64 channels (one master and seven slaves) = 8 x 150 mA = 1.2 A This supply can range from 5V to 40V, depending on your sensor module requirements. This power will be directly connected to the sensor modules. Choose a low-noise linear supply for best performance. Keep in mind the current output capability. All sensor modules are powered simultaneously, so multiply the number of Loop or DUT Power Supply channels by the expected device current to determine the requirements. Example: For eight current loop modules: Assume that maximum current = 25mA (overcurrent range); 8 x 25 mA = 20 0mA Example: For 64 current loop modules: 64 x 25 mA = 1.6 A Must allow for software control through RS-232 or IEEE488. Precision Digital Multimeter Suggested instrument is the Agilent 34401A. This controller is not required if you are using RS-232 control. This item is a National Instruments IEEE488 controller. It allows you to GPIB-USB-HS connect your computer to the precision multimeter for automatic control. 7 SBOU087A – August 2010 – Revised April 2011 Multi-Cal-System Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated |
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