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SP8858 Datasheet(PDF) 1 Page - Zarlink Semiconductor Inc |
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SP8858 Datasheet(HTML) 1 Page - Zarlink Semiconductor Inc |
1 / 21 page SP8858 1·5GHz Professional Synthesiser Supersedes March 1997 version, DS3843 - 3.0 DS3843 - 4.1 July 1998 The SP8858 is a single chip synthesiser intended for PLL signal synthesis applications up to 1.5GHz and includes a dual modulus prescaler (4N/N11), programmable A, M and R dividers, digital phase detector, charge pump and lock detect circuits. The SP8858 is a development of the SP8853 synthesiser with low residual phase noise, increased dynamic range above 1GHz and an improved high gain phase detector design that eliminates the dead-band. The low prescaler modulus, programmable to either 16/17 or 8/9, together with the 15-bit M counter and 13-bit reference counter make this device ideal for a diverse range of high performance applications. The nominal phase detector gain is set by a reference current into pin 24 and the gain can be varied over a 4:1 range when the device is programmed. The dividers, the phase detector sense, the prescaler modulus and the data buffer control logic are also programmable using the three wire serial interface. An alternative 22-bit control word for the A and M dividers and phase detector gain can be stored so allowing fast frequency hopping and bandwidth switching by simply toggling the logic level on pin 13 (F1/F2). In addition, the A counter of the ‘active’ buffer can be programmed with only 6 bits, allowing fast hopping to adjacent channels. A simple exclusive - or lock detect circuit is also provided, the sensitivity of which is determined by an external capacitor. FEATURES s Low Residual Phase Noise (see Reference 1) s Operation to 1·5GHz over Full Temperature Range s High Input Sensitivity s Improved Linear Digital Phase Detector s Programmable Charge Pump Current: 10 µA to 2 mA s On-chip 416/17 or 48/9 Dual Modulus Prescaler s Three-wire Serial Data Interface s 13-bit Reference Counter s 15-bit M Counter s Stores an Alternative Programming Word s Facility to Program A counter Only s Power Saving Standby Mode ABSOLUTE MAXIMUM RATINGS Supply voltage Storage temperature Operating temperature Prescaler input voltage 2 0·3V to 17V 2 65 °C to 1150°C 2 55 °C to 1125°C 2·5V p-p 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 FREF* POWER DOWN VEE4 VCC4 VCC1 RF INPUT RF INPUT SP8858 HP28 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 CP OUTPUT RPD VCC3 GROUND XTAL 1 XTAL2 VEE2 FREF* POWER DOWN VEE4 VCC4 VCC1 RF INPUT RF INPUT SP8858 HC28 CP OUTPUT RPD VCC3 GROUND XTAL 1 XTAL2 VEE2 Fig. 1 Pin connections (top view) ORDERING INFORMATION SP8858 IG HCAR 240 °C to 185°C (Industrial grade) SP8858 MG HCAR 255 °C to 1125°C (Military grade) SP8858 IG HPAS 240 °C to 185°C (Industrial grade) |
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