MAS9279

www.DataSheet4U.com DA9279.003 13 July 2006 MAS9279 IC FOR 10.00 – 52.00 MHz VCTCXO DESCRIPTION The MAS9279 is an integrated circuit well suited to build high end VCTCXO for telecommunication. The trimming is done through a serial bus and the calibration information is stored in an internal PROM. This means no rework for trimming is needed. To build a VCTCXO only crystal is required in addition to MAS9279. The compensation method is fully analog, working continuously without generating any steps or other interference. Fourth Order Compensation Frequency Stability +/- 0.3 ppm Wide Frequency Range Very Low Phase Noise Low Voltage Minimum Operating Temperature –40 ° C Tri State CMOS Output FEATURES Very small size Minimal current consumption Wide operating temperature range Very low phase noise Programmable VC-sensitivity Minimum operating temperature –40 ° C Oscillator frequency output f0/2 version available APPLICATIONS VCTCXO for high end telecommunications systems TCXO for high end telecommunication systems BLOCK DIAGRAM DA CLK PV Fourth Term CUB INF SENS LIN 4 f(T) 5 3 8 TE1 Σ T Vref TMux TE2 f(T) VC CDAC1 6 4 VDD CDAC2 OUT VSS X2 X1 1 (10) DA9279.003 13 July 2006 PIN DESCRIPTION Pin Description Power Supply Voltage Programming Input Serial Bus Clock Input Serial Bus Data Input Temperature Output Test Multiplexer Output Voltage Control Input Crystal Oscillator Output Crystal/Varactor Oscillator Input Power Supply Ground...