TRF3761-DIRHAR

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The Texas Instruments TRF3761-DIRHAR is a high performance, 5-6000 MHz fractional-N/integer-N jitter generating frequency synthesizer that is ideal for a wide range of applications, including wideband RF complex, cellular infrastructure, point-to-point and point-to-multipoint radio, in-building, and WiFi systems. It is an integrated solution that contains control logic, power management, and a frequency modulator to reduce jitter using DIRHAR (direct injection radio harmonic analysis). This device is an excellent choice for applications that require both wide tuning range and low jitter performance.

The TRF3761-DIRHAR is a fully integrated, broadband frequency synthesizer that integrates an up/down fractional-N/integer-N PLL, a VCO and feedback loop filter, as well as control logic and power management, a frequency modulator, and a dual-modulus prescaler.

The device contains a digital phase locked loop (DPLL) with dual-modulus prescaler, allowing it to generate frequencies across a wide tuning range of 5 to 6000 MHz. Additionally, the dual-modulus prescaler reduces the jitter of programmable dividers. The direct injection radio harmonic analysis (DIRHAR) loop uses high-speed digital signal processing (DSP) functionality to reduce jitter and improve signal-to-noise (SNR) ratio. It also maintains low spurious signals and provides fast switching speeds.

The TRF3761-DIRHAR features different operating modes, including integer-N and fractional-N (divide-by-4 to divide-by-300) modes. In the fractional-N mode, the ratio of modulated signal to the control voltage is greater than 1, allowing for precise frequency tuning. The direct injection radio harmonic analysis (DIRHAR) loop carries out high-speed DSP calculations to keep the jitter FOM (figure of merit) minimal. In the integer-N mode, the device is able to generate precise frequencies.

The TRF3761-DIRHAR is designed to provide fast switching times, allowing it to generate lockable signals in multiple bands across its tuning range. It is also designed to minimize spurious signals and phase noise while providing precise frequency synthesis, allowing it to be used in a variety of communications applications.

The device\'s integrated dual-modulus prescaler is designed to reduce jitter and improve SNR. It uses a multi-stage injection-locked frequency divider that leverages the frequency spacing between channels in the RF signal to reduce jitter. The device can also use two different dividers, one for low frequency and one for high frequency, to further reduce jitter for high accuracy frequency control.

In addition, the TRF3761-DIRHAR features a wide range of features that make it an ideal choice for a variety of applications. Its integrated power management circuit provides high power efficiency, helping to reduce power consumption. Additionally, it provides fast synthesizer settling time and supports wide voltage ranges, allowing for flexible operation.

The TRF3761-DIRHAR is an excellent choice for a wide range of applications, from cellular infrastructure to point-to-point and point-to-multipoint radios and in-building systems. Its integrated power management and frequency modulation technology offer superior performance, while its fast synthesizer settling times and wide voltage range enable reliable operation. These features, combined with its high output power and low jitter, make it an ideal choice for a wide range of clock and timing applications.

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