September 26, 2019
Nihon Dempa Kogyo Co., Ltd.
Representative Director and President
Hiromi Katoh

Development of compact size temperature-compensated crystal oscillator
with the industry's highest (*1) low-phase noise characteristics
Nihon Dempa Kogyo Co., Ltd. has developed a TCXO (temperature-compensated crystal oscillator) thatis 1.6×1.2×0.45mm in size that achieves the industry's highest level of low-phase noise of -168dBc/
Hz@100kHz offset(*2). Sample shipments will begin in October 2019.
In order to improve communication quality with multi-level modulation and larger capacity such as 5G andother high-speed mobile communication Wi-Fi 6(IEEE802.11ax) and SONET/SDH(Synchronous Optical
Network/Synchronous Digital Hierarchy),and it is expected that the demand for a compact size TCXO withlow 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 the reference
signal source used in the equipment.
Also phase noise is closely related to the RMS phase jitter (*3), so selecting an oscillator with excellent phasenoise 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-factor (*4) grown by our high technology, and developed a compact size temperature-compensa
ted crystal oscillator with the industry's highest low-phase noise characteristics by reducing the noise of theoscillation circuits and constructing a manufacturing line for miniaturization product.

・Floor noise-168 dBc/Hz @100 kHz offset (*2)
(reduced by-12 dBc/Hz compared to the previous model)
・Phase jitter 68fs @12kHz to 5MHz
(76% reduction compared to conventional jitter)
Based on this technology,we plan to expand our product lineup.
(*1) Our survey in September 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 crystal oscillator, it indicates the degree of resonance sharpness, and the larger (higher) this valuemeans the oscillation is more stable.

[Appearance of the product][Sample/Mass Production]
Sample shipments are scheduled to start in October 2019 and mass production is scheduled to start inMarch 2020.

[Specification characteristics]
Model Name

NT1612AJA

External Size

1.6 x 1.2 x 0.45mm

Electrical Characteristics
Nominal Frequency

26MHz to 52MHzStandard Frequency

26MHz, 52MHzPower Supply Voltage (Vcc)+1.8V +/- 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)

Output Voltage

Min. 0.8 V (p-p) (DC Coupling (Note 2))

Frequency / Temperature Characteristic

Max. +/- 0.5 x 10-6

Long-term Frequency Stability

Max. +/- 1.0 × 10-6/year (at +25 deg C)(Note 1) DC+1.7V to +3.3V can be used.
(Note 2) The DC cut capacitor is not built in. Connect the capacitor (1,000pF) in series with the oscillator
output line.

[Example of Phase Noise Characteristics]
Conditions: nominal frequency 26MHz, temperature +25 deg C

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