National Semiconductor, The Sight And Sound Of Information, Welcomes You

Products > Wireless Communications > PLLs > Fractional-N PLLs > LMX2350

LMX2350 Product Folder

2.5 GHz/550 MHz PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer

See Also:

LMX2354 - lower phase noise, lower spurs, faster lock time

Generic P/N 2350

WEBENCH Live Simulation!

LMX2350 Webench™ Design/Analyze/Build It
RF-Side PLL Design Options
Min Output Frequency	MHz	>= 500	help
Max Output Frequency	MHz	<= 2500	help
Channel Spacing	KHz	> 0	help
AUX-Side PLL Design Options
Min Output Frequency	MHz	>= 50	help
Max Output Frequency	MHz	<= 550	help
Channel Spacing	KHz	> 0	help
Global Design Options
Crystal Frequency	KHz	> 0	help
Max Power Supply	V	> 0	help

What is Webench?

Parametric Table

Temperature Min (deg C)	-40
Temperature Max (deg C)	85
PLL Type	RF/IF Dual
Modulus	Fractional-N
Operating Frequency (MHz)	2500
Aux Op Frequency (MHz)	550
Normalized Phase Noise (dBc/Hz)	-201
Supply Current (mA)	6
Supply Min (Volt)	2.70
Supply Max (Volt)	5.50
Fastlock	Yes
Prescalers	16/17 or 32/33
Aux Prescalers	8/9 or 16/17

Datasheet

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
LMX2350 LMX2352 PLLatinum Fractional N RF Integer N IF Dual Low Power Frequency Synthesizer	405 Kbytes	5-Dec-01	View Online	Download	Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking

Type

Pins

MSL/Lead-Free Availability

Lead
Time

Qty

SPICE

IBIS

Qty

$US each

LMX2350TM

TSSOP

Status

Full production

N/A

1K+

$2.57

rail
of
61

NSUZXYTT
LMX2350
TMDD

8-10 weeks

10000

LMX2350TMX

TSSOP

Status

Full production

N/A

1K+

$2.57

reel
of
2500

NSUZXYTT
LMX2350
TMDD

8-10 weeks

10000

LMX2350SLBX

Laminate CSP

Status

Full production

N/A

1K+

$2.63

reel
of
2500

NSUZXYTT
LMX2350
SLBDD

8-10 weeks

10000

The LMX2350/2352 is part of a family of monolithic integrated fractional N/ Integer N frequency synthesizers designed to be used in a local oscillator subsystem for a radio transceiver. It is fabricated using National's 0.5µ ABiC V silicon BiCMOS process. The LMX2350/2352 contains dual modulus prescalers along with modulo 15 or 16 fractional compensation circuitry in the RF divider. A 16/17 or 32/33 prescale ratio can be selected for the LMX2350, and the LMX2352 provides 8/9 or 16/17 prescale ratios. The IF circuitry for both the LMX2350 and LMX2352 contains an 8/9 prescaler, and is fully programmable. Using a fractional N phase locked loop technique, the LMX2350 /52 can generate very stable low noise control signals for UHF and VHF voltage controlled oscillators (VCOs).

For the RF PLL, a highly flexible 16 level programmable charge pump supplies output current magnitudes from 100µA to 1.6mA. Two uncommitted CMOS outputs can be used to provide external control signals, or configured to FastLock™ mode. Serial data is transferred into the LMX2350/2352 via a three wire interface (Data, LE, Clock). Supply voltage can range from 2.7 V to 5.5 V. The LMX2350/ LMX2352 family features very low current consumption; typically LMX2350 (2.5 GHz) 6.5 mA, LMX2352 (1.2 GHz) 4.75 mA at 3.0V. The LMX2350/2352 are available in a 24-pin TSSOP and 24-pin CSP surface mount plastic package.

Features

2.7 V to 5.5 V operation
Low current consumption LMX2350: Icc = 6.75mA typ at 3v LMX2352: Icc = 5.00mA typ at 3v
Programmable or logical power down mode Icc = 5 µA typ at 3v
Modulo 15 or 16 fractional RF N divider supports ratios of 1, 2, 3, 4, 5, 8, 15, or 16
Programmable charge pump current levels RF 100µA to 1.6mA in 100µA steps IF 100µA or 800 µA
Digital filtered lock detect

Applications