LMX2604 Triple-band GSM900/DCS1800/PCS1900 LMX2604 fully integrat

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LMX2604 Triple-band GSM900/DCS1800/PCS1900 LMX2604 fully integrat

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LMX2604 Triple-band GSM900/DCS1800/PCS1900
LMX2604 Triple-band GSM900/DCS1800/PCS1900
LMX2604 fully integrated (Voltage-Controlled Oscillator) designed GSM900/DCS1800/PCS1900 triple-band application. ideal transmitter modulation loop providing extremely small form factor phase noise. VCOs, second DCS/PCS. separate buffer amplifiers drive external high power amplifier, GSM900 band other DCS1800/ PCS1900 bands. also differential buffer amplifier drive mixer offset PLL. resonant circuits VCOs fully integrated chip ease application high quality factor embedded tank circuit achieves very phase noise characteristics output. only required external components couple supply bypass capacitors matching components. control controlling oscillation frequency shared VCOs. LMX2604 provided 20-pin (Leadless Leadframe package).
Features
On-chip Triple-band VCOs GSM: DCS: 1710 1785 PCS: 1850 1910 On-chip tank circuit phase noise -167 dBc/Hz offset band -163 dBc/Hz offset band -162 dBc/Hz offset band High output power mode mode current consumption mode mode +2.6 +3.0 supply voltage 0.25 CMOS process Small 20-pin package
Applications
Transmit GSM, DCS, Closed loop modulation systems
Functional Block Diagram
20066101
FastLockis trademark National Semiconductor Corporation. TRI-STATE registered trademark National Semiconductor Corporation.
2004 National Semiconductor Corporation
DS200661
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LMX2604
Connection Diagram
20-Pin (TM) Package
20066102
Descriptions
Number 2,4,15 11,19 6,7,8,9,10,14,17,18,20
Note exposed attach grounded.
Name (Note MIXout GSMout DCSPCSout CPin
Description Chip enable input pin. High=enable, Low=disable Ground pins Mixer output output) Band switch input pin. High=DCS/PCS, Low=GSM Supply voltage pins output band output band Charge pump input Connection, These pins must left open
Ordering Information
Package 20-Pin 20-Pin Part Number LMX2604LQ LMX2604LQX Package Marking LMX2604LQ LMX2604LQ Media Transport 1000 Unit Tape Reel 4500 Unit Tape Reel Drawing LQA20A LQA20A
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LMX2604
Absolute Maximum Ratings (Notes
Parameter Supply Voltage Input Voltage Input Current (Note Storage Temperature Range
Note Maximum input current logic pin, power pins.
Symbol TSTG
Ratings -0.3 -0.3 VDD+0.3
Unit
Recommended Operating Conditions
Parameter Ambient Temperature Supply Voltage GND) Symbol Condition VDD=3V Typical Unit
Note "Absolute Maximum Ratings" indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, guarantee specific performance limits. guaranteed specifications test conditions, Electrical Characteristics. guaranteed specifications apply only test conditions listed. Note This Device high performance integrated circuit with rating sensitive. Handling assembly this device should only done ESD-free workstations. Note Stresses excess absolute maximum ratings cause permanent latent damage device. These absolute stress ratings only. Functional operation device only implied these other conditions excess those given operation sections data sheet. Exposure absolute maximum ratings extended periods adversely affect device reliability
Electrical Characteristics
Characteristics (VDD=2.8V, TA=25°C; unless otherwise noted) Symbol Parameter Frequency Range Remarks Band Band Band KVCO Tuning Sensitivity (Note Output Power Output power MIXout Phase Noise (GSM Band) Band Band Band Band Band Band Band offset L(f) offset offset (Note offset (Note offset L(f) Phase Noise (DCS Band) offset offset (Note offset (Note offset L(f) Phase Noise (PCS Band) Second Harmonic Suppression offset offset (Note offset (Note Bands output port. 1710 1850 -5.5 -4.5 -3.5 -2.5 -120 -136 -152 -167 -112 -130 -146 -163 -110 -129 -145 -162 -124 dBc/Hz -124 dBc/Hz -128 dBc/Hz 1785 1910 -1.5 -0.5 MHz/V Units
Pout PMIXout
Note Tuning Sensitivty measured after coarse lock. Minimum maximum limits supported characterization. Note Supported characterization
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LMX2604
Electrical Characteristics
Symbol Parameter Logical Input High Voltage Logical Input Voltage Logical Input High Current Logical Input Current Input Capacitance IDD,GSM IDD,DCS/PCS Istd Supply Current (Note Supply Current (Note Standby Current
(Continued)
Characteristics (VDD=2.8V, TA=25°C; unless otherwise noted) Condition 0.8VDD -0.3 -2.5 -2.5 VDD+0.3 0.2VDD Units
Note current consumption driver amplifier included Note BSW, CPin pins
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LMX2604
Typical Performance Characteristics Phase Noise
Typical phase noise characteristics band
20066161
Typical phase noise characteristics band
20066162
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LMX2604
Typical Performance Characteristics Phase Noise
(Continued)
Typical phase noise characteristics band
20066163
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LMX2604
Typical Performance Characteristic GSMout Impedance
GSMout
20066130
GSMout Frequency (MHz) 1000 Real (Ohms) Imaginary (Ohms) Absolute (Ohms)
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LMX2604
Typical Performance Characteristic MIXout Impedance,
MIXout,
20066131
MIXout, Frequency (MHz) 1000 Real (Ohms) Imaginary (Ohms) -256 -249 -243 -237 -232 Absolute (Ohms)
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LMX2604
Typical Performance Characteristic DCSPCSout Impedance
DCSPCSout
20066132
DCSPCSout Frequency (MHz) 1600 1650 1700 1750 1800 1850 1900 1950 2000 Real (Ohms) Imaginary (Ohms) Absolute (Ohms)
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LMX2604
Typical Performance Characteristic MIXout Impedance, DCS/PCS
MIXout, DCS/PCS
20066133
MIXout, DCSPCS Frequency (MHz) 1600 1650 1700 1750 1800 1850 1900 1950 2000 Real (Ohms) Imaginary (Ohms) -164 -162 -160 -157 -157 -153 -150 -146 -143 Absolute (Ohms)
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LMX2604
Functional Description
PRODUCT DESCRIPTION LMX2604 VCOs, which configured resonant oscillator. active components tank elements integrated oscillator core tank circuit designed immune external noise such supply load variation. easy-to-use occupies extremely small area board. output amplifiers also integrated deliver high output power GSM/DCS/PCS applications. amplifiers isolate oscillator cores from external load, drive external load. output driver designed have noise floor reduce pulling load variation. additional amplifier drive mixer transmit also provided. Only attenuator composed passive elements necessary meet power level mixer input transmit PLL. frequency oscillator controlled CPin pin, which internally connected varactor. This control connected loop filter modulation loop transmit path. additional noise this tuning input directly translated into noise, which degrade phase noise characteristics oscillator. Typically, loop filter provides appropriately impedance source output thus proper additional filtering stage often required reduce high frequency noise spurious signals.
FREQUENCY SELECTION POWER DOWN CONTROL selects operating frequency band. table below shows appropriate settings with pin. High High High High Output Band (GSM) High Band (DCS/PCS)
real implementation, component values tank circuit vary from nominal value. built-in circuit track variation compensate that kind variation during normal operation. This self-correction algorithm does require external control signal elements. figure below shows application circuit LMX2604. LMX2604 developed handset part transmitter PLL. complete offset transmit path, several passive elements external loop filter should also provided. charge pump output port external transceiver CPin pin. locking process LMX2604 composed stages. First, internal control circuitry LMX2604 controls fast frequency acquisition behavior LMX2604. After frequency acquisition, whole loop enters normal operating mode.
Application Circuit LMX2604
20066172
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LMX2604
Functional Description
FREQUENCY ACQUISITION
(Continued)
rising edge goes through frequency acquisition mode which coarse locks approximate final frequency. This portion lock digitally sets
frequency such that final tuning voltage CPin line approximately Vdd/2. Benefits this system maximum required charge pump voltage reduced large frequency ranges tuned with small tuning voltage. This makes digitally tuned different from conventional analog VCOs.
Frequency Acquisition Timing Diagram
20066122
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LMX2604
Physical Dimensions
inches (millimeters) unless otherwise noted
20066107
20-Pin (Leadless Leadframe package) Package Order Number LMX2604LQX 4500 Unit Reel Order Number LMX2604LQ 1000 Unit Reel Package Number LQA20
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LMX2604 Triple-band GSM900/DCS1800/PCS1900
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that products packing materials meet provisions Customer Products Stewardship Specification (CSP-9-111C2) Banned Substances Materials Interest Specification (CSP-9-111S2) contain ``Banned Substances'' defined CSP-9-111S2.
National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LMX2604 Triple-band GSM900/DCS1800/PCS1900 LMX2604 fully integrat

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