April 19, 2019
Nihon Dempa Kogyo Co., Ltd.
Representative Director and President
Hiromi Katoh
Development of temperature-compensated crystal oscillator
with the industry's highest (*1) low-phase noise characteristic
Nihon Dempa Kogyo Co., Ltd. has developed a TCXO (temperature-compensated crystaloscillator) that is 2.0 x 1.6 x 0.7mm in size that achieves the industry's highest level of low-phasenoise of-170dBc/ Hz@100kHz offset(*2). Sample shipments will begin in July 2019.
In order to improve communication quality with multi-level modulation and larger capacity such as5G and other high-speed mobile communication Wi-Fi 6 (IEEE802.11ax) and SONET/SDH (Synchronouss Optical Network/Synchronous Digital Hierarchy), and it is expected that the demandfor TCXO with low-phase noise characteristics will increase in the future.
It is important to select and design an oscillator because the modulation accuracy (signal phase andamplitude deviation) in communication equipment is largely affected by the phase noise of thereference signal source used in the equipment.
Also, phase noise is closely related to the RMS phase jitter (*3), so selecting an oscillator withexcellent phase noise contributes to the improvement of the phase jitter.
In response to these demands, we have optimized the design of quartz resonators using synthetic
quartz with a high Q (*4) value grown by our high technology, and developed a temperaturecompensated quartz oscillator with the industry's highest low phase noise characteristics by reducing
the noise of the oscillation circuits.
・Floor noise-170dBc/Hz @100kHz offset (*2)
(reduced by-17dBc/Hz compared to the previous model)
・Phase jitter: 110fs @12kHz to 5 MHz(71% reduction compared to conventional jitter)
Based on this technology, we plan to expand our product lineup to other sizes.
This product will be presented at Wireless Technology Park 2019, which will be held at Tokyo-Big
Sight from Wednesday, May 29 to Friday, May 31. (NDK Booth: West 3 Hall 1931)(*1) Our survey in March 2019(*2) Oscillation frequency: 26 MHz, temperature: +25 deg C(*3) Deviation or fluctuation in the time axis that occurs in the waveform when transmitting a digital
signal.
(*4) In a quartz oscillator, it indicates the degree of resonance sharpness, and the larger (higher) thisvalue means the oscillation is more stable.
[Appearance of the product]

[Sample/Mass Production]
Sample shipments are scheduled to start in July 2019 and mass production is scheduled to start inJanuary 2020.
[Specification characteristics]
Model Name

NT2016SJA

External Size

2.0 x 1.6 x 0.7 mm

Electrical Characteristics
Nominal Frequency

13 MHz to 52 MHz

Standard Frequency

26MHz, 52MHzPower Supply Voltage (VCC)+ 1.8 V +/- 5% (Note 1)

Load Impedance

10kΩ//10pF

Operating Temperature Range-30 to +85 deg C

Current Consumption

Max. 2.5mA /26MHz (Enable)
Max. 4uA /26MHz (Disable)(DC Coupling(Note 2) )Output Voltage

Min. 0.8 V (p-p)

Frequency/Temperature Characteristics

Max. +/- 0.5 x 10-6

Long-term Frequency Stability

Max. +/- 1.0 x 10-6/year (at +25deg C)(Note 1) DC+1.7 V to +3.3 V can be used.
(Note 2) The DC cut capacitor is not built in. Connect the capacitor (1,000 pF) in series with theoscillator output line.
[Example of Phase Noise Characteristics]
Conditions: nominal frequency 26 MHz, temperature +25 deg C

For more information on the product, please contact:[Contact Info]
e-Mail : ndkpr-m@ndk.com