The DS4026 from Maxim is a digitally controlled temperature compensated crystal oscillator (DC-TCXO) said to have unprecedented accuracy among TCXOs.
It provides frequency accuracy and stability better than ±1,0 ppm over the temperature range of -40°C to +85°C. Over a 10-year operational life, the device is accurate to better than ±4,6 ppm and provides excellent phase noise performance, with characteristics of -140 dBc/Hz at 1 kHz offset.
This digitally tunable TCXO employs proprietary design and calibration techniques that negate the effects of electromechanical stress, thermal variations, and frequency perturbations (also known as 'activity dips'), which can be excited in all crystal elements as they operate over temperature. To meet the accuracy performance specifications, the system also uses DSP-designed components, which are individually programmed to the specific crystal's element over temperature, voltage and specific signal quality. The resulting digital design is highly robust.
The DS4026 digital TCXO also integrates functions such as a ±3°C accurate and readable temperature sensor and a 16-bit DSP-controlled DAC for frequency stability, trimming, and calibration; these functions are accomplished through an I²C control interface. The devices frequency can be tuned with a resolution better than 1 ppb and tuning ranges greater than ±10 ppm. It operates from a 3,3 V ±5% supply voltage and is packaged in a standard 300-mil 16-pin SO. The device is fully RoHS compliant, and is available in commercial and industrial temperature versions.
This TCXO supports applications that require an extremely accurate and stable time base like wireless infrastructure applications, SONET/SDH systems, instrumentation and test systems, and GPS and navigation equipment.
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