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.

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 (RF) 64/65 or 128/129
   KB8823 (RF) 32/33 or 64/65
   KB8821/22/23 (IF) 8/9 or 16/17
• Programmability via serial bus interface
• No dead-zone PFD
• Variable charge pump output current
• High speed lock mode

APPLICATIONS
• Cellular telephone systems : KB8821
• Portable wireless communications : KB8822
   (PCS/PCN, cordless)
• Wireless Local Area Networks (W-LANs)
   : KB8823
• Other wireless communication systems