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LM98555 bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM98555 bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 15 page LM98555 www.ti.com SNAS290D – DECEMBER 2005 – REVISED APRIL 2013 Several other techniques will also help maintain signal quality, and minimize timing differences between critical signals. Vias should not be used for critical timing signals. These can add impedance discontinuities that will affect the waveform quality. Traces should have gradual bends and avoid sharp changes in direction that can also introduce impedance discontinuities. SELECTIVE DRIVER ENABLING With the Enable pins, the user has the capability to enable only the drivers that are required for the application, thus eliminating unnecessary outputs switching. The following table shows the details. EN1 EN0 Driver-set State 0 0 P1Aout(1:0) and P2Aout(1:0) are enabled; all others disabled. 0 1 P1Aout(3:0) and P2Aout(3:0) are enabled; all others disabled. 1 0 P1Aout(5:0) and P2Aout(5:0) are enabled; all others disabled. 1 1 All P1Aout and P2Aout drivers are enabled. Note: The disabled drivers' outputs are in TRI-STATE. POWER SUPPLY SEQUENCING During device power-up and power-down, VDDI must be maintained less than (VDDO + 0.2V) to prevent excessive current flow through the internal ESD protection circuitry. Since most applications will involve 3V on VDDI and 5V on VDDO, this can be easily met. If this voltage relationship cannot be met, then the DC pin and package limits for input current must be maintained by controlling the source impedance of the VDDI supply. POWER AND GROUND - PLANES VERSUS BUSES The best performance will be achieved by using planes rather than traces for power and ground. Planes provide lower electrical and thermal impedance. Ground bounce and ringing are reduced, electromagnetic emissions are minimized and the best thermal performance will be realized. A single common ground plane should be used for all power and signal domains. Another circuit board layer can be used to provide power to the various circuitry. Different power buses can be provided by isolated planes within this layer of the circuit board. EMI MANAGEMENT Good EMI control will be achieved by addressing the following items: • Provide proper source termination of output signals • Limit length of output traces • Ensure adequate power supply decoupling • Provide power and ground planes as much as possible • Provide common ground plane for all signals, especially between LM98555 outputs and load CCD • Enable and use the minimum number of outputs needed Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM98555 |
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