NEW PRODUCT INFORMATION
KDS Daishinku Develops the World's First Low Voltage (+1.8V) TCXO for GPS

                                         

Daishinku Corporation (President: Sohei Hasegawa) has announced the development of a low voltage SMD Temperature Compensated Crystal Oscillator (TCXO) operating at +1.8V. The new TCXO (called the DSB321SE) will aid the further miniaturization of GPS receiver module design. Samples of the DSB321SE are available now.

KDS Daishinku has been manufacturing SMD Temperature Compensated Crystal Oscillators (TCXO) for the GPS market for many years and the current DSB321SD is operable up to +2.4V; however the new DSB321SE can operate at +1.8V. The frequency stability vs. temperature values for the new +1.8V product are ±1.0×10-6 over a -20deg.C to +60deg.C and ±1.5×10-6 -40deg.C to +85deg.C.

In most systems with a GPS receiver the block of devices which receive and process the signal from the GPS satellite are put together in a module. The development of such GPS receiver module ICs is moving increasingly towards miniaturization, low current consumption and low voltage operation and in the future the majority of them are expected to operate as +1.8V supply voltage. The DSB321SE has been designed with this in mind and its actual operating parameters are between +1.7V and +3.0V. Conventional models operate between +2.3V and +5.5V.
Decreasing the operating voltage of the TCXO to 1.8V has the double advantage of making it possible for every other device in a GPS receiver module to work under the same +1.8V voltage and removing the need for voltage source regulators.

The DSB321SE is the same size as conventional 3225 size TCXOs (3.2×2.5×0.9mm), with a volume of 0.0072cc and weighing 0.03g. Through the utilization of a newly developed IC KDS has also managed to stick with the single package structure which is an important feature of all its’ TCXO packages. The DSB321SE is also manufactured on the same production lines as conventional 3225 size TCXOs which provides for greater flexibility during production.

 
Characteristics
  • Miniature, high precision device (3.2×2.5×0.9mm, Volume 0.0072cc, Weight 0.03g)
  • Low voltage (Supply voltage +1.8V, available up to +1.7V+3.0V)
  • Low harmonics
    * Reduced high order harmonics. The layout of PCB for TCXO will be easier.
  • Low phase noise
  • Single packaged structure making the use of moisture-proof packaging unnecessary.
    Moisture Sensitivity Level: LEVEL 1 (IPC/JEDEC J-STD-033)
  • Pb free

[ Main Applications ]
GPS

[ Mass Production ]
Starting April 2007

 
Electrical specification

Product

DSB321SE(TCXO)

Output Frequency Range

9.6MHz to 40MHz

Output Frequency

12.504/ 13/ 16.3676/ 16.369/ 16.8/ 18.414/ 23.104/ 24.5535/ 26 MHz

Supply Voltage

+1.8V (Available up to +1.7V+3.0V)

Current Consumption

+1.1 mA max. (F = 15MHz)
+1.3 mA max. (15 < F = 26MHz)
+1.5 mA max. (F > 26MHz)

Output Level

0.8Vp&-p min.

Output Load

(10kO//10pF) ±10%

Frequency Stability Tolerance

±1.5×10-6(After 2 reflows)

Frequency Stability Tolerance
 vs. Temperature

±1.0×10-6/&-20°C to +60°C
±1.5×10-6/&-40°C to +85°C

Frequency Stability
 Tolerance vs. Supply Voltage

±0.2×10-6/(+1.8V±0.1V)

Frequency Stability Tolerance
 vs. Load Variation

±0.2×10-6/(10kO//10pF)±10%

Frequency Stability Tolerance
 vs. Aging

±1.0×10-6/year

Start Up Time

2.0msec max.
*Consult our sales representative for other specifications.
 
Dimensions