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LMX2347TM, LMX2347TMX, LMX2350

Table of contents:
Info of LMX2347TM
Info of LMX2347TMX
Info of LMX2350

LMX2347TM, LMX2347TMX, LMX2350 Selling Leads, Datasheet

MFG:NS Package Cooled:TSSOP D/C:TSSOP-16

LMX2347TM, LMX2347TMX, LMX2350 Datasheet download

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Part Number: LMX2347TM

MFG: NS

Package Cooled: TSSOP

D/C: TSSOP-16

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LMX2350 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 radiotransceiver. It is fabricated using National's 0.5µ ABiC V sili-con BiCMOS process. The LMX2350/2352 contains dualmodulus prescalers along with modulo 15 or 16 fractionalcompensation circuitry in the RF divider. A 16/17 or 32/33prescale ratio can be selected for the LMX2350, and theLMX2352 provides 8/9 or 16/17 prescale ratios. The IF cir-cuitry for both the LMX2350 and LMX2352 contains an 8/9prescaler, and is fully programmable.Using a fractional Nphase locked loop technique, the LMX2350 /52 can gener-ate very stable low noise control signals for UHF and VHFvoltage controlled oscillators (VCO's).

For the RF PLL, a highly flexible 16 level programmablecharge pump supplies output current magnitudes from100µA to 1.6mA. Two uncommitted CMOS outputs can beused to provide external control signals, or configured toFastLock™ mode. Serial data is transferred into theLMX2350/2352 via a three wire interface (Data, LE, Clock).

Supply voltage can range from 2.7 V to 5.5 V. The LMX2350/2352 family features very low current consumption; typicallyLMX2350 (2.5 GHz) 6.75 mA, LMX2352 (1.2 GHz) 5.00 mAat 3.0V. The LMX2350/2352 are available in a 24-pin TSSOPsurface mount plastic package.

LMX2350 Maximum Ratings

Parameter	Symbol	Value			Units
Parameter	Symbol	Min	Typ	Max	Units
Power Supply Voltage	V_ccRF	-0.3		6.5	V
	V_ccIF	-0.3		6.5	V
	V_pRF	-0.3		6.5	V
	V_pIF	-0.3		6.5	V
Voltage on any pin with GND =V_SS =0 volts	V_I	-0.3		V_CC + 0.3	V
Storage Temperature Range	T_s	-65		+150
Lead Temperature (Solder 4 sec.)	T_L			+260
ESD - Whole Body Model (Note 2)			2		Kev

LMX2350 Features

2.7 V to 5.5 V operation
Low current consumptionLMX2350: Icc = 6.75mA typ at 3vLMX2352: Icc = 5.00mA typ at 3v
Programmable or logical power down modeIcc=5µAtypat3v
Modulo 15 or 16 fractional RF N divider supports ratiosof 1, 2, 3, 4, 5, 8, 15, or 16
Programmable charge pump current levelsRF 100µA to 1.6mA in 100µA stepsIF 100µA or 800 µA
Digital filtered lock detect

LMX2350 Typical Application

Portable wireless communications (PCS/PCN, cordless)
Dual mode cellular telephone systems
Zero blind slot TDMA systems
Spread spectrum communication systems (CDMA)
Cable TV Tuners (CATV)

LMX2350 Connection Diagram

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