LMX2322 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – PLLatinumTM 2.0 GHz Frequency Synthesizer for RF Personal Communications

Advance Information
LMX2322 PLLatinum^TM
2.0 GHz Frequency Synthesizer
for RF Personal Communications
General Description
The LMX2322 is a high performance frequency synthesizer with
integrated 32/33 dual modulus prescaler designed for RF operation
up to 2.0 GHz. Using a proprietary digital phase locked loop
technique, the LMX2322’s linear phase detector characteristics
can generate very stable, low noise control signals for UHF and
VHF voltage controlled oscillators.
Features
„ RF operation up to 2.0 GHz
„ 2.7 V to 3.9 V operation
„ Low current consumption: Icc = 3.5 mA (typ) at Vcc = 3.75 V
„ Dual modulus prescaler: 32/33
„ Internal balanced, low leakage charge pump
Serial data is transferred into the LMX2322 via a three-line
MICROWIRE^TM interface (Data, LE, Clock). Supply voltage range
is from 2.7 V to 3.9 V. The LMX2322 features very low current
consumption, typically 3.5 mA at 3.75V. The charge pump
provides 4mA output current.
The LMX2322 is manufactured using National’s ABiC V BiCMOS
process and is packaged in a 16 pin TSSOP and a 16 pin Chip
Scale Package (CSP).
Applications
„ Cellular telephone systems (GSM, NADC, CDMA, PDC, PHS)
„ Personal wireless communications (DCS-1800, DECT, CT-1+)
„ Wireless local area networks (WLANs)
„ Other wireless communication systems
Functional Block Diagram
OSCin
OSC
10-Bit
R Counter
CLOCK
LE
DATA
18-Bit
Microwire
Interface
fin
Prescaler
32/33
fin
15-Bit
N Counter
Phase
Comp
Charge
CPo
Pump
9/24/1998
Rev 1.6
1