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LMX2350 -
2.5 GHz/550 MHz PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer [Life-time buy]
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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
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General Description
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. More...
Applications
| • | 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) |
Also Recommended
| LMX2485 | Delta-Sigma For Lowest Phase Noise, Lowest Spurs, & Fastest Lock Time |
| LMX2354▲ | Lower Phase Noise, Lower Spurs, & Faster Lock Time |
| LMX2364▲ | Even Lower Phase Noise, Lower Spurs, & Faster Lock Time |
| LMX2470 | Delta-Sigma For Lowest Phase Noise, Low Spurs, & Fastest Lock Time |
Additional Resources
Design Tools
Application Notes
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Datasheet
Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LMX2350SLBX
| LMX2350TM
| NATIONAL SEMICONDUCTOR
| 25 Oct 2005
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LMX2350TM
| LMX2531
| National Semiconductor
| 30 Nov 2009
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LMX2350TMX
| LMX2531
| National Semiconductor
| 30 Nov 2009
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General Description
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.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LMX2350TM | ABIC | 0 | 16313 | 0 | 0 | 2828000 | 2 | 802452721
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LMX2350TMX | ABIC | 0 | 16313 | 0 | 0 | 2828000 | 2 | 802452721
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Design Tools
| Title | Size in Kbytes |
Date |
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| PLL Codeloader Driver Software |
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View |
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| "LMX-Utility Evaluation Board: Add features and functionality to the standard evaluation boards, such as amplification, loop filter, and RF functions" |
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View |
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Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1119: AN-1119 Voltage Doubler Design and Analysis |
92
Kbytes |
1-May-04 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1821: Application Note 1821 CPRI Repeater System |
1497
Kbytes |
15-May-08 |
Download |
| AN-1865: Application Note 1865 Frequency Synthesis and Planning for PLL Architectures |
151
Kbytes |
6-Feb-09 |
Download |
[Information as of 8-Nov-2009]
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RoHS Compliance Information