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SP8853 Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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SP8853 Datasheet(HTML) 1 Page - Mitel Networks Corporation |
1 / 14 page SP8853A/B 1·3GHz Professional Synthesiser The SP8853 is a low power single chip synthesiser intended for professional radio applications, containing all the elements (apart from the loop amplifier) required to build a PLL frequency synthesis loop The device is serially programmable by a three-wire data highway and contains three independent buffers to store one reference divider word and two local oscillator divider words. A digital phase detector with two charge pumps, programmable in phase and gain, are provided to improve lock-up performance. The preset operation of the charge pumps can be overwritten or the comparison frequencies switched to output ports under control of the divider word. The dual modulus ratio and so operating range is also programmable through the same word. A power down mode is incorporated as a battery economy feature. The SP8853 is specified at 1·3GHz at 255 °C to1125°C (A grade) and 240 °C to185°C (B grade). Supersedes March 1997 version, DS2352 - 3.0 DS2352 - 4.0 March 1998 FEATURES s Improved Digital Phase Detector Eliminates ‘Dead Band’ Effects s Low Operating Power, Typically 175mW s 1·3GHz Operating Frequency s Complete Phase Locked Loop s High Input Sensitivity s Programmed throughThree-Wire Bus s Wide Range of Reference Division Ratios s Local Storage for Two Frequency Words, giving Rapid Frequency Toggling s Programmable Phase Detector Gain s Power Down Mode ABSOLUTE MAXIMUM RATINGS Supply voltage Storage temperature Prescaler input voltage 2 0·3V to 17V 2 55 °C to 1150°C 2·5V p-p Fig. 1 Pin identification diagram (top view) ORDERING INFORMATION SP8853/A/HC Military temperature range SP8853/B/HC Industrial temperature range 432 1 28 27 26 12 13 14 15 16 17 18 5 6 7 8 9 10 11 25 24 23 22 21 20 19 PD2 OUTPUT RPD VCC3 GROUND XTAL 1 XTAL2 VEE2 FREF* POWER DOWN VEE4 VCC4 VCC1 RF INPUT RF INPUT SP8853 HC28 *FPD and FREF outputs are reversed by the phase detector sense bit in the F1/F2 programming word. The above diagram is correct when the sense bit is low. See Table 2 and Fig. 7. VCC1, VEE1 – preamplifier and prescaler supplies VCC2, VEE2 – oscillator supplies VCC3, VEE3 – charge pump 2 supplies VCC4, VEE4 – ECL supplies |
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