October 29th, 2020
Nihon Dempa Kogyo Co., Ltd.
Representative Director and President
Hiromi Katoh
Development of the world's smallest 7×5mm-sized OCXO capable of handling hightemperatures (+95°C) for 5G base stations
Nihon Dempa Kogyo Co., Ltd. has developed the world's smallest-class (*1)
7×5mm-sized OCXO (quartz oscillator with a temperature chamber) for 5G
small base stations with an operation upper limit temperature up to +95°C,
and has begun sample shipment since October.
In order to achieve high-speed, high-capacity communication and ultra-low latency
communication with the spread of 5G and local 5G, the system covers the area by
installing a large number of small base stations. These small base stations will be
installed on the top of outdoor steel poles, rooftops, walls, and other narrow spaces, andthe environment of the installation site will be exposed to direct sunlight, wind, andrain, making them more stringent than before.
Since the internal components of miniaturized base station equipment areaffected by internal temperature rise due to high-density mounting and external
environmental changes of high temperature and humidity, a compact
high-stability crystal oscillator with stable operation at high temperatures, goodtemperature slope characteristics (*2) with good phase noise characteristics isrequired.
To meet these demands, we have achieved miniaturization by developing a dedicated
ASIC (*3) that contains all of the oscillator circuits, temperature-control circuits, and othercomponents of OCXO on a single chip.
In addition, by leveraging the strengths of integrated manufacturing fromthe growth of quartz crystal to the manufacturing of crystal oscillators, wehave developed a small SC-cut oscillator using high-Q crystal quartz (*4)
to achieve the high stability and low noise required by 5G systems. Furthermore,
the temperature slope characteristics achieves a value of ±0.1 x 10-9/°C, which is 1/200
compared to the conventional high-precision TCXO.
Also, the adaptation of airtight packages in which humidity and dust do not enter hasenhanced reliability.
The newly developed product was presented at IFCS2020(International Frequency
Control Symposium) conference held from July 19 to 23 of this year.
We will continue to contribute to the realization of a safe, secure and comfortablesociety through our quartz device and crystal application equipment businesses.

(*1) October 2020, our survey(*2) Indicates the temperature characteristics of the crystal oscillator with respect tothe temperature change, and the smaller the value, the smaller the frequencychange with respect to the change of the ambient temperature.
(*3) Abbreviation of Application Specific Integrated Circuit: In order to realize thisOCXO, we have developed a new type of oscillator circuit and a temperature-control
circuit to maximize the performance of the crystal oscillator(*4) Synthetic crystal quartz for high stability with very low impurities and low distortion
caused by hysteresis of temperature changes[Sample and mass production]
Sample shipments started in October 2020, mass production scheduled for June 2021
[Model name] NH7050SA[Product Appearance][Product characteristics]
Dimensions
Nominal Frequency Range
Standard Frequency
OutputSupply Voltage [VCC]
Power Consumption (when stable)
Operating Temperature Range
Frequency / Temperature Slope Characteristics
Frequency/Temperature Characteristics■Frequency / Temperature Slope Characteristics

301.520

1.0

Δf / f / t [x10 -9/ºC]

Δf / f [x10 -9 ][Characteristic example]■Frequency / Temperature Characteristics

100-10-20

7.0 x 5.0 x 3.3mm
10MHz to 50MHz
20M, 30.72M, 38.88M, 48MHzLVCMOS
DC+3.3 V
Max. 0.6 W-40 °C to +95 °C
Typ. +/- 0.1 x 10-9 /°C
Max. +/- 20 x 10-90.5
0.0-0.5-1.0-30-1.5-40 -30 -20 -10010 20 30 40 50 60 70 80 90

Ambient Temperature [ºC][Contact Info]
e-Mail : newsrelease@ndk.com-40 -30 -20 -10 010 20 30 40 50 60 70 80 90

Ambient Temperature [ºC]