SiTime: ENDR-TTT Endura® Ruggedized Precision Low Power Super-TCXO®
The ENDR-TTT is a factory-programmable 1 to 105 MHz MEMS Super-TCXO for precision GNSS receivers, PNT systems, avionics, guided munitions, UAVs, manpack radios, synchronization systems, and high-reliability communications equipment. During GNSS outages, its stable local reference limits the accumulation of timing error, extending holdover and helping receivers narrow the frequency-search window during reacquisition.
DualMEMS® places TempFlat® and temperature-sensing MEMS resonators on the same die, providing 20 µK temperature resolution without the sensor-to-resonator thermal lag found in legacy quartz TCXOs. TurboCompensation® provides more than 100 Hz compensation bandwidth, maintaining dynamic stability during airflow and thermal shock without activity dips or micro jumps. The device limits vibration-induced frequency shift with typical acceleration sensitivity of 0.004 ppb/g and withstands mechanical shock up to 30,000 g.
- Frequency: 1 to 105 MHz (LVCMOS); 1 to 60 MHz (clipped sinewave)
- Frequency-Stability: ±50 / ±100 / ±200 / ±500 ppb (orderable grades)
- Operating-Temperature: -40°C to +85°C; -40°C to +105°C; -55°C to +105°C; or -55°C to +125°C (orderable options)
- Frequency-Slope (ΔF/ΔT): ±2.5 ppb/°C max. for the ±50 ppb grade; ±3 ppb/°C for ±100 ppb; ±6 ppb/°C for ±200 and ±500 ppb, at 0.5°C/min
- Acceleration-Sensitivity: 0.004 ppb/g typ., 0.009 ppb/g max.; computed per MIL-PRF-55310, section 4.8.18.3.1
- ADEV: 5e-12 typ. at 1 s and 10 s averaging time
- Aging: ±0.5 ppm typ. over 20 years at 85°C
- Mechanical-Ruggedness: 30,000 g shock resistance; 96,000 g survivability; 70 g vibration resistance
- Supply-Voltage: 1.8 V / 2.5 V / 2.8 V / 3.0 V / 3.3 V
- Output: unregulated LVCMOS, regulated LVCMOS, or clipped sinewave
- Digital-Frequency-Control: ±200 ppm through I2C or SPI
- Phase-Noise: -151 dBc/Hz typ. (low-power) or -153 dBc/Hz typ. (low-jitter), 10 MHz carrier at 10 kHz offset
- Power-Consumption: 20 mW typ. (low-power option, 1.8 V, 10 MHz, no load)
- Export-Classification: ECCN EAR99; HTS 8542.39.0000
- Package: 5.0 x 3.2 mm ceramic, 10-pin
