SA8025A Datasheet | Philips Semiconductors

INTEGRATED CIRCUITS SA8025A Low-voltage 1.8GHz fractional-N synthesizer Product specification IC17 Data Handbook 1996 Oct 15 Philips Semiconductors Philips Semiconductors Product specification 1.8GHz low-voltage Fractional-N synthesizer DESCRIPTION The SA8025A is a monolithic low power, high performance dual frequency synthesizer fabricated in QUBi C Bi CMOS technology. The SA8025A is an improved version of the SA8025, suitable for narrow band systems like the Japan Personal Digital Cellular (PDC) system. The new design improves the performance of the fractional spur pensation circuitry. The new version is pin-for-pin patible with the previous version. Featuring Fractional-N division with selectable modulo 5 or 8 implemented in the Main synthesizer to allow the phase detector parison frequency to be five or eight times the channel spacing. This feature reduces the overall division ratio yielding a lower noise floor and faster channel switching. The phase detectors and charge pumps are designed to achieve phase detector parison frequencies up to 5MHz. A four modulus prescaler (divide by 64/65/68/73) is integrated on chip with a maximum input frequency of 1.8GHz at 3V. Programming and channel selection are realized by a high speed 3-wire serial interface. A 1GHz version (SA7025DK) is also available with the same pinout. PIN CONFIGURATION DK Package CLOCK DATA STROBE VSS RFIN RFIN VCCP REFIN RA AUXIN VDD TEST LOCK RF RN VDDA PHP PHI VSSA PHA 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 Features - Operation up to 1.8GHz at 3V - Fast locking by “Fractional-N” divider - Auxiliary synthesizer - Digital phase parator with proportional and integral charge pump output SR00623 Figure 1. Pin Configuration - Supply voltage range 2.7 to 5.5V - Excellent input sensitivity: VRF_IN = - 20d Bm APPLICATIONS - High speed serial input - Low power consumption - Programmable charge pump currents - PHS (Personal Handy-phone System) - PDC...