LMX2571-EP Series

Enhanced-product, 1.34-GHz, low-power, extreme-temperature RF synthesizer with FSK modulation

Catalog

Enhanced-product, 1.34-GHz, low-power, extreme-temperature RF synthesizer with FSK modulation

Part	Type	Differential - Input:Output	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Output	Input	Number of Circuits	Voltage - Supply [Max]	Voltage - Supply [Min]	Package / Case	Frequency - Max [Max]	Ratio - Input:Output [custom]	Supplier Device Package	PLL
Texas Instruments LMX2571SRHHTEP	Frequency Synthesizer		125 °C	-55 °C	Surface Mount	Clock	Clock Crystal	1	3.45 V	3.15 V	36-VFQFN Exposed Pad	1.4 GHz	1:2	36-VQFN (6x6)

Catalog

Enhanced-product, 1.34-GHz, low-power, extreme-temperature RF synthesizer with FSK modulation

Key Features

• VID#: V62/21613-01XE-55 °C to +125 °C Operating TemperatureAny Frequency From 10 MHz to 1344 MHzLow Phase Noise and Spurs–123 dBc/Hz at 12.5-kHz Offset at 480 MHz–145 dBc/Hz at 1-MHz Offset at 480 MHzNormalized PLL Noise Floor of –231 dBc/HzSpurious Better Than –75 dBc/HzNew FastLock to Reduce Lock TimeA Novel Technique to Remove Integer Boundary SpursIntegrated 5-V Charge Pump and Output Divider for External VCO Operation2-, 4-, and 8-Level or Arbitrary Level Direct Digital FSK ModulationOne TX/RX Output or Two Fanout OutputsLow Current Consumption39-mA Typical Synthesizer Mode (Internal VCO)9-mA Typical PLL Mode (External VCO)24-Bit Fractional-N Delta Sigma ModulatorFunctional Differences between LMX2571 vs LMX2571-EPLMX2571-EP has no TrCtl PinLMX2571-EP has no OSCin* pin, Differential Mode, or Crystal ModeVID#: V62/21613-01XE-55 °C to +125 °C Operating TemperatureAny Frequency From 10 MHz to 1344 MHzLow Phase Noise and Spurs–123 dBc/Hz at 12.5-kHz Offset at 480 MHz–145 dBc/Hz at 1-MHz Offset at 480 MHzNormalized PLL Noise Floor of –231 dBc/HzSpurious Better Than –75 dBc/HzNew FastLock to Reduce Lock TimeA Novel Technique to Remove Integer Boundary SpursIntegrated 5-V Charge Pump and Output Divider for External VCO Operation2-, 4-, and 8-Level or Arbitrary Level Direct Digital FSK ModulationOne TX/RX Output or Two Fanout OutputsLow Current Consumption39-mA Typical Synthesizer Mode (Internal VCO)9-mA Typical PLL Mode (External VCO)24-Bit Fractional-N Delta Sigma ModulatorFunctional Differences between LMX2571 vs LMX2571-EPLMX2571-EP has no TrCtl PinLMX2571-EP has no OSCin* pin, Differential Mode, or Crystal Mode

Description

The LMX2571-EP device is a low-power, high-performance, wideband PLLatinum™ RF synthesizer that integrates a delta-sigma fractional N PLL, multiple core voltage-controlled oscillator (VCO), programmable output dividers and two output buffers. The VCO cores work up to 5.376 GHz resulting in continuous output frequency range of 10 MHz to 1344 MHz. This synthesizer can also be used with an external VCO. To that end, a dedicated 5-V charge pump and an output divider are available for this configuration. A unique programmable multiplier is also incorporated to help improve spurs, allowing the system to use every channel even if it falls on an integer boundary. The output has an integrated SPDT switch that can be used as a transmit and receive switch in FDD radio application. Both outputs can also be turned on to provide 2 outputs at the same time. The LMX2571-EP supports direct digital FSK modulation through programming or pins. Discrete level FSK, pulse shaping FSK, and analog FM modulation are supported. A new FastLock technique can be used allowing the user to step from one frequency to the next in less than 1.5 ms even when an external VCO is used with a narrow band loop filter. The LMX2571-EP device is a low-power, high-performance, wideband PLLatinum™ RF synthesizer that integrates a delta-sigma fractional N PLL, multiple core voltage-controlled oscillator (VCO), programmable output dividers and two output buffers. The VCO cores work up to 5.376 GHz resulting in continuous output frequency range of 10 MHz to 1344 MHz. This synthesizer can also be used with an external VCO. To that end, a dedicated 5-V charge pump and an output divider are available for this configuration. A unique programmable multiplier is also incorporated to help improve spurs, allowing the system to use every channel even if it falls on an integer boundary. The output has an integrated SPDT switch that can be used as a transmit and receive switch in FDD radio application. Both outputs can also be turned on to provide 2 outputs at the same time. The LMX2571-EP supports direct digital FSK modulation through programming or pins. Discrete level FSK, pulse shaping FSK, and analog FM modulation are supported. A new FastLock technique can be used allowing the user to step from one frequency to the next in less than 1.5 ms even when an external VCO is used with a narrow band loop filter.