LMX2492 - Uncategorized TEXAS INSTRUMENTS - Free user manual and instructions
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| Product Type | Fractional-N PLL with Integrated VCO |
| Frequency Range | 1.35 GHz to 2.25 GHz (VCO) |
| Phase Noise | -226 dBc/Hz (Normalized PLL floor) |
| Supply Voltage | 3.15 V to 3.45 V |
| Current Consumption | ~120 mA (typical) |
| Operating Temperature | -40°C to +85°C |
| Package Type | QFN-24 (4 mm x 4 mm) |
| Dimensions | 4 mm x 4 mm x 0.75 mm |
| Weight | ~0.03 g |
| Main Functions | Frequency synthesis, phase locking, VCO output, charge pump output |
| Programming Interface | 3-wire SPI |
| Integrated VCO Gain | ~50 MHz/V |
| Charge Pump Current | Programmable up to 5 mA |
| Reference Input Frequency | Up to 800 MHz |
| PLL Features | Fractional-N, delta-sigma modulator, fast lock, cycle slip reduction |
| Care and Cleaning | Handle with ESD precautions; clean with isopropyl alcohol if needed |
| Safety | ESD sensitive device; follow standard ESD safe handling procedures |
| Spare Parts | Not applicable (integrated circuit); order replacement IC or demo board |
| General Information | Designed for wireless infrastructure, test equipment, and radar applications |
Frequently Asked Questions - LMX2492 TEXAS INSTRUMENTS
What is the frequency range of the LMX2492?
The LMX2492 operates with a VCO frequency range from 1.35 GHz to 2.25 GHz. Additionally, it can be used with an external VCO to extend the range.
How do I program the LMX2492?
The device is programmed via a 3-wire SPI interface. You need to send register writes to configure dividers, charge pump current, and other settings. Refer to the datasheet for register maps.
What is the phase noise performance?
The normalized PLL phase noise floor is -226 dBc/Hz, and the integrated VCO phase noise is typically -145 dBc/Hz at 100 kHz offset (1.8 GHz carrier).
What supply voltage is required?
The LMX2492 requires a supply voltage of 3.15 V to 3.45 V, with a typical current consumption of 120 mA.
Does the LMX2492 include an integrated VCO?
Yes, it features an integrated VCO covering 1.35 to 2.25 GHz. You can also bypass the internal VCO and use an external one if needed.
How can I achieve fast lock?
The LMX2492 supports a fast lock mode using a programmable timeout and cycle slip reduction. Use the F_LOCK register to enable fast lock and set the appropriate timeout.
What package is the LMX2492 available in?
It comes in a 24-pin QFN package measuring 4 mm x 4 mm with a 0.4 mm pitch.
Is there a reference design available?
Yes, Texas Instruments offers evaluation modules (EVM) and reference designs for the LMX2492. The LMX2492EVM and associated user guide provide a complete layout example.
Can I use the LMX2492 for fractional-N synthesis?
Yes, the LMX2492 is a fractional-N PLL with a third-order delta-sigma modulator. It supports both integer and fractional division ratios.
What are the typical applications?
Typical applications include wireless base stations, microwave radio, test and measurement equipment, and radar systems requiring low phase noise and fine frequency resolution.
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USER MANUAL LMX2492 TEXAS INSTRUMENTS
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Product information
Brand : TEXAS INSTRUMENTS
Model : LMX2492
Category : Uncategorized