LMX2350TMX National Semiconductor, LMX2350TMX Datasheet

LMX2350TMX

Manufacturer Part Number

LMX2350TMX

Description

TSSOP

Manufacturer

National Semiconductor

Datasheet

1.LMX2350TMX.pdf (21 pages)

Specifications of LMX2350TMX

Date_code

09+

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LMX2350/LMX2352

PLLatinum Fractional N RF / Integer N IF

Dual Low Power Frequency Synthesizer

LMX2350 2.5 GHz/550 MHz

LMX2352 1.2 GHz/550 MHz

General Description

The LMX2350/2352 is part of a family of monolithic inte-

grated fractional N/ Integer N frequency synthesizers de-

signed 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 gener-

ate 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

LMX2350/2352 via a three wire interface (Data, LE, Clock).

Supply voltage can range from 2.7 V to 5.5 V. The LMX2350/

Block Diagram

™

mode. Serial data is transferred into the

DS100831

LMX2352 family features very low current consumption; typi-

cally 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

n 2.7 V to 5.5 V operation

n Low current consumption

n Programmable or logical power down mode

n Modulo 15 or 16 fractional RF N divider supports ratios

n Programmable charge pump current levels

n Digital filtered lock detect

Applications

n Portable wireless communications (PCS/PCN, cordless)

n Dual mode cellular telephone systems

n Zero blind slot TDMA systems

n Spread spectrum communication systems (CDMA)

n Cable TV Tuners (CATV)

LMX2350: Icc = 6.75mA typ at 3v

LMX2352: Icc = 5.00mA typ at 3v

Icc = 5 µA typ at 3v

of 1, 2, 3, 4, 5, 8, 15, or 16

RF 100µA to 1.6mA in 100µA steps

IF 100µA or 800 µA

DS100831-1

www.national.com

March 2001

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