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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF5079 датащи(PDF) 7 Page - NXP Semiconductors |
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PCF5079 датащи(HTML) 7 Page - NXP Semiconductors |
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7 / 28 page  2001 Nov 21 7 Philips Semiconductors Product specification Dual-band power amplifier controller for GSM, PCN and DCS PCF5079 handbook, full pagewidth 46 2 0 8 . . . time time time time closed open closed open closed open closed open closed open time time time (QB) time time MGT327 Vprebias VVCD, VVCG Vhome CODESTART CODEKICK VVDAC td1 td2 td3 td4 VDD PU S5 SFD, SFG S4 S3 S1 >70 mV >20 µs <3 µs (max) 2 µs (typ) >5 µs Fig.4 Start-up and initialization timing diagram. The maximum value of CODESTART is limited by the isolation requirement of the PA used in the application. The pulse determined by CODEKICK minus CODESTART applied for two quarter-bits ensures a start-up of the control voltage with very low jitter and high repetitivity. The codes following CODEKICK have to be chosen to get the best ramp shape and spectrum performance. |
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