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KB8821 Datasheet

  • KB8821

  • FREQUENCY SYNTHESIZER

  • 21頁(yè)

  • SAMSUNG   SAMSUNG

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PRELIMINARY SPECIFICATION (V1.5)
FREQUENCY SYNTHESIZER
INTRODUCTION
The KB8821/22/23 are high performance dual frequency syn-
thesizers 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擄C
20-TSSOP-225 -40 ~ +85擄C
FEATURES
鈥?Very low current consumption
(8821:3.5mA, 22:4.5mA, 23:5.5mA)
鈥?Operating voltage range : 2.7 ~ 4.0V
鈥?Selectable power saving mode(Icc=1uA typical @3V)
鈥?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
鈥?Cellular telephone systems : KB8821
鈥?Portable wireless communications : KB8822
(PCS/PCN, cordless)
鈥?Wireless Local Area Networks (W-LANs)
: KB8823
鈥?Other wireless communication systems
鈥?Programmability via serial bus interface
鈥?No dead-zone PFD
鈥?Variable charge pump output current
鈥?High speed lock mode
BLOCK DIAGRAM
finRF
finRF
+
-
RF
Prescaler
RF
N Counter
RF
Phase
Detector
RF
LD
CLOCK
LE
DATA
Serial Data Control
foLD
Data Out
Multiplexer
foLD
RF
Charge
Pump
CPoRF
RF
R Counter
OSCin
IF
R Counter
finIF
finIF
+
-
IF
Prescaler
IF
N Counter
IF
Phase
Detector
IF
LD
IF
Charge
Pump
CPoIF
Figure 1. BLOCK DIAGRAM
99-06-15
1

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