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MV95308CDP Datasheet(PDF) 7 Page - Zarlink Semiconductor Inc |
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MV95308CDP Datasheet(HTML) 7 Page - Zarlink Semiconductor Inc |
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7 / 9 page  MV95308 5 APPLICATIONS INFORMATION RS-343A and RS-170 Video Generation For generation of RS-343A compatible video levels (see Fig.4) it is recommended that a singly terminated 75 Ω load be used with an RSET resistor value of approximately 1.82kΩ Similarly for the generation of RS-170 video levels a singly terminated 75 Ω load should be used but in association with an RSET value of approximately 1.29kΩ to provide the increased voltage range. Non-Video Applications The MV95308 may be used in non-video applications as explained in the pin description for STRDAC mode.The relationship between RSET and the full scale output current has been explained previously and for a singly terminated 75 Ω load an R SET resistor value of approximately 1.19kΩ should be used. PCB LAYOUT CONSIDERATIONS The PCB layout should provide low noise on the MV95308 power and ground lines by shielding the digital inputs and providing adequate decoupling. The PCB should utilise both power and ground planes for best performance, connecting both planes to their respective regular PCB planes through a ferrite bead located as close as possible to the device. For best performance, a 100nF capacitor should be used to decouple the reference and supply pins. Decoupling should take place as close to the device as possible to reduce lead inductance. The digital inputs to the device should be isolated as much as possible from the analog outputs and other analog circuitry and should not overlay the analog ground and power planes. To reduce noise pick-up, long clock lines to the device should be avoided. For best performance the analog output should have a 75 Ω load connected to analog ground. Fig.4 Composite video output waveform Fig.5 Applications/test board |
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