S1T8825

PRELIMINARY ( VER.2.1 ) 1.1GHZ DUAL PLL S1T8825 INTRODUCTION The S1T8825 is a high performance dual frequency synthesizer with two integrated high frequency pre-scalers for RF operation up to 1.1 GHz. The S1T8825 is composed of modulus pre-scalers providing 64 and 66, no dead-zone PFD, selectable charge pump current, selectable power down mode circuits, lock detector output, and loop filter’s time constant switch. It is fabricated using the ASP5HB Bi-CMOS process and is available 16-TSSOP with surface mount plastic packaging. Serial data is transferred into the S1T8825 via three-wire interface (CK, DATA, EN). 16−TSSOP−0044 FEATURES Two systems for receiver and transmitter Very low operating current consumption: Icc = Typ. 5.5mA @ 3.0V Low operating power supply voltage : 2.2 ~ 5.5V ( 200MHz ~ 550MHz Operating ) 2.7 ~ 3.6V ( 550MHz ~ 1.1GHz Operating ) Modulus pre-scaler: 64 / 66 No dead-zone PFD Colpitts type local oscillation Selectable charge pump current Selectable power down mode TSSOP 16-pin package (0.65 mm pitch) ORDERING INFORMATION Device +S1T8825X01-R0B0 +: New Product Package 16−TSSOP−0044 Operating Temperature −30 °C to + 85 °C APPLICATIONS Cordless telephone systems Portable wireless communications (PCS) Wireless Local Area Networks (WLANs) Other wireless communication systems 1 PRELINIMARY( VER.2.1 ) S1T8825 1.1GHZ DUAL PLL BLOCK DIAGRAM Fin1 1 Pre_Amp 1/2 Prescaler 1 32, 33 Buffer Prescaler 1 32, 33 Buffer 1/2 Pre...