LMX2582RHAR RF/IF and RFID

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1. Describe

The LMX2582RHAR device is a low noise, wideband RF PLL with integrated VCO for supported frequencies Range from 20 MHz to 5.5 GHz. The device supports Fractional-N and Integer-N modes with 32 bits Fractional divider that allows fine frequency selection. 47 fs of integrated noise at the 1.8 GHz output makes it Ideal low noise source. Combine first-class PLL with integrated LDO and integrated VCO noise, The device eliminates the need for multiple discrete Devices in high performance systems. The device accepts input frequencies up to 1.4 GHz, It combines a divider and Programmable low noise multiplier allows flexibility frequency planning. additional programmable Low Noise Multiplier Allows User to Mitigate Impact Integer boundary spurs. In fractional-N mode, The device can adjust the output phase by 32 bits resolution. For applications requiring fast frequencies changes, the device supports a quick calibration option This takes less than 25 µs. This performance is achieved by using a single 3.3-V supply. It supports 2 flexible differential outputs, Can also be configured as a single-ended output. Users can choose from VCO and the second from the channel divider. when Each output can be muted when not in use Respectively.

2. Feature

    1. Output frequency range from 20 to 5500 MHz

    2. Industry leading phase noise performance

        – VCO phase noise: –144.5dBc/Hz at 1MHz offset at 1.8GHz output

        – Normalized PLL noise floor: –231 dBc/Hz

        – Normalized PLL flicker noise: –126 dBc/Hz

        – 47-fs RMS jitter at 1.8 GHz output (12 kHz to 20 MHz)

    3. Input clock frequency up to 1400 MHz

    4. Phase detector frequency up to 200 MHz, up to 400 MHz in integer-N mode

    5. Supports fractional-N and integer-N modes

    6. Dual differential output

    7. Innovative solutions to reduce spurs

    8. Programmable phase adjustment

    9. Programmable charge pump current

  10. Programmable output power levels

  11. SPI or uWire (4-wire serial interface)

  12. Single supply operation: 3.3 V

3. Application

    1. Test and measurement equipment

    2. Cellular base station

    3. Microwave backhaul

    4. High-performance clock source for high-speed data converters

    5. Software Defined Radio

4. Pin configuration

5. Function description

The LMX2582RHAR is a high performance wideband synthesizer (PLL with integrated VCO). The output frequency range is 20 MHz to 5.5 GHz. The VCO cores cover an octave from 3.55 to 7.1 GHz. The output channel divider covers the frequency range from 20 MHz to the lower limit of the VCO core. The input signal frequency range is wide, from 5 to 1400 MHz. After the input, there is a programmable flexible frequency plan between the input (OSCin) and the phase detector. The phase detector (PFD) can take frequencies from 5 to 200 MHz, but also has extended mode as low as 0.25 MHz and as high as 400 MHz. A phase-locked loop (PLL) contains a sigma-delta modulator for fractional-N divider values. The fractional denominator can be programmed to be 32 bits long, allowing very fine resolution of frequency steps. There is a phase adjustment function that allows the output phase to be relative to the input (OSCin) by a fraction of the size of the fractional denominator. The output power is programmable and can be designed by pulling up high-power components at specific frequencies on the output pins. The digital logic is a standard 4-wire SPI or uWire interface, compatible with 1.8-V and 3.3-V.