KB8823

PRELIMINARY SPECIFICATION (V1.5) FREQUENCY SYNTHESIZER INTRODUCTION The KB8821/22/23 are high performance dual frequency synthesizers with integrated prescalers designed for RF operation up to 1.2GHz/2.0GHz/2.5GHz and IF operation up to 520MHz. The KB8821/22/23 contain dual-modulus prescalers. The RF synthesizer adopts a 64/65 or an 128/129 prescaler(32/33 or 64/65 for the KB8823) and the IF synthesizer adopts an 8/9 or a 16/17 prescaler. Using a proprietary digital phase-locked-loop technique, the KB8821/22/23 have linear phase detector characteristic and can be used for very stable, low noise local oscillator signal. Supply voltage can range from 2.7V to 4.0V. The KB8821/22/ 23 are now available in a 20-TSSOP/24-QFN package. 20-TSSOP-225 KB8821/22/23 ORDERING INFORMATION Device KB8821/22/23 KB8821/22/23 Package 24-QFN* Tem. Range -40 ~ +85°C 20-TSSOP-225 -40 ~ +85°C FEATURES Very low current consumption(8821:3.5mA, 22:4.5mA, 23:5.5mA) Operating voltage range : 2.7 ~ 4.0V Selectable power saving mode(Icc=1uA typical @3V) Dual modulus prescaler : KB8821/22 KB8823 KB8821/22/23 (RF) 64/65 or 128/129 (RF) 32/33 or 64/65 (IF) 8/9 or 16/17 * QFN : Quad Flat Non-leaded(see Addendum). APPLICATIONS Cellular telephone systems : KB8821 Portable wireless communications : KB8822 (PCS/PCN, cordless) Wireless Local Area Networks (W-LANs) : KB8823 Other wireless communication systems Programmability via serial bus interface No dead-zone PFD Variable charge pump ...