The LMX5251 is a high performance, monolithic, radio transceiver optimized for Bluetooth™ communications systems. When used in conjunction with a Bluetooth baseband controller, a complete Bluetooth node with a Host Control Interface (HCI) can be implemented.

The LMX5251 radio architecture allows for minimal external components. The highly integrated design includes the Low Noise Amplifier (LNA), mixer, on-chip filters, 2.5 GHz delta-sigma phase-lock loop (ΔΣ PLL), voltage controlled oscillator, modem functions, and dual power supply regulators. Digital modulation and demodulation techniques are utilized for a robust manufacturable design. Power management includes control over individual chip functions and internal voltage regulation for optimum performance.

The LMX5251 modem circuitry provides the data communication link to the Bluetooth baseband controller. The interface is flexible and works with solutions that require a standalone Bluetooth radio. The LMX5251 can be placed in Sleep mode (reducing system current consumption) and is optimized for low power operation. It operates from a single 2.85V to 3.6V power supply.

The LMX5251 is manufactured using a CMOS process and is available in a 48-pin WQFN (Thin Quad Flatpack, No lead) package. Die processing is also available through Texas Instruments Die Products Group.

The LMX5251 is the most recent revision of the LMX5250 and is completely interoperable with the LMX5100 Bluetooth Baseband Controller.

• Bluetooth Version 1.1 Qualified
• Flexible Radio Frequency (RF) to Baseband (BB) Interface
• LOW POWER
  • Low Current Consumption
  • Power Management Control Functions
• HIGH PERFORMANCE
  • < –82 dBm Sensitivity
  • Class 2/3 Operation
  • ± 1/12 Bit Sampling Resolution
  • Closed Loop ΔΣ Modulation
• HIGH INTEGRATION
  • Low IF (Intermediate Frequency) Architecture with Digital Demodulation
  • Integrated Radio Frequency Voltage Controlled Oscillator (RFVCO)
  • Dual on-chip Voltage Regulators:)Input Voltages 2.85V–3.6VOutput Nominally 2.5V
  • 48-pin WQFN (Thin Quad Flatpack No lead) Package
  • No Pb Leadframe – LMX5251SQ NOPB