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PDF LMX2330U Data sheet ( Hoja de datos )
| Número de pieza | LMX2330U | |
| Descripción | (LMX2330U - LMX2332U) PLLatinum Ultra Low Power Dual Frequency Synthesizer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
July 2002
LMX2330U/LMX2331U/LMX2332U
PLLatinum™ Ultra Low Power Dual Frequency
Synthesizer for RF Personal Communications
LMX2330U 2.5 GHz/600 MHz
LMX2331U 2.0 GHz/600 MHz
LMX2332U 1.2 GHz/600 MHz
General Description
The LMX233xU devices are high performance frequency
synthesizers with integrated dual modulus prescalers. The
LMX233xU devices are designed for use as RF and IF local
oscillators for dual conversion radio transceivers.
A 32/33 or a 64/65 prescale ratio can be selected for the 2.5
GHz LMX2330U RF synthesizer. A 64/65 or a 128/129 pres-
cale ratio can be selected for both the LMX2331U and
LMX2332U RF synthesizers. The IF circuitry contains an 8/9
or a 16/17 prescaler. Using a proprietary digital phase locked
loop technique, the LMX233xU devices generate very
stable, low noise control signals for RF and IF voltage con-
trolled oscillators. Both the RF and IF synthesizers include a
two-level programmable charge pump. The RF synthesizer
has dedicated Fastlock circuitry.
Serial data is transferred to the devices via a three-wire
interface (Data, LE, Clock). Supply voltages from 2.7V to
5.5V are supported. The LMX233xU family features ultra low
current consumption:
LMX2330U (2.5 GHz) — 3.3 mA, LMX2331U (2.0 GHz)
— 2.9 mA, LMX2332U (1.2 GHz) — 2.5 mA at 3.0V.
The LMX233xU devices are available in 20-Pin TSSOP and
24-Pin CSP surface mount plastic packages.
Features
n Ultra Low Current Consumption
n Upgrade and Compatible to LMX233xL Family
n 2.7V to 5.5V Operation
n Selectable Synchronous or Asynchronous Powerdown
Mode:
ICC-PWDN = 1 µA typical
n Selectable Dual Modulus Prescaler:
LMX2330U
RF: 32/33 or 64/65
LMX2331U
RF: 64/65 or 128/129
LMX2332U
RF: 64/65 or 128/129
LMX2330U/31U/32U IF: 8/9 or 16/17
n Selectable Charge Pump TRI-STATE® Mode
n Programmable Charge Pump Current Levels
RF and IF: 0.95 or 3.8 mA
n Selectable Fastlock™ Mode for the RF Synthesizer
n Push-Pull Analog Lock Detect Output
n Available in 20-Pin TSSOP and 24-Pin Chip Scale
Package (CSP)
Applications
n Mobile Handsets
(GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC,
DCS)
n Cordless Handsets
(DECT, DCT)
n Wireless Data
n Cable TV Tuners
Thin Shrink Small Outline Package (MTC20)
Chip Scale Package (SLB24A)
10136680
PLLatinum™ is a trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS101366
10136681
www.national.com
1 page  
Detailed Block Diagram
10136603
Notes:
1. A 64/65 or 128/129 prescaler ratio can be selected for the LMX2331U and LMX2332U RF synthesizers. A 32/33 or 64/65 prescaler ratio can be selected for the
LMX2330U RF synthesizer.
2. VCC supplies power to the RF and IF prescalers, RF and IF feedback dividers, RF and IF reference dividers, RF and IF phase detectors, the OSCin buffer,
MICROWIRE, and FoLD circuitry.
3. VP RF and VP IF supply power to the charge pumps. They can be run separately as long as VP RF ≥ VCC and VP IF ≥ VCC.
5 www.national.com
5 Page 
Typical Performance Characteristics
Sensitivity
LMX2330U fIN RF Input Power Vs Frequency
VCC = VP RF = 3.0V
LMX2330U fIN RF Input Power Vs Frequency
VCC = VP RF = 5.5V
10136642
10136643
11 www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LMX2330U.PDF ] | |
Hoja de datos destacado
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