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DA1175.008 13 July, 2006
MAS1175
IC FOR 10.00 – 20.00 MHz VCTCXO
Low Power Wide Supply Voltage Range True Sine Wave Output Very High Level of Integration • Electrically Trimmable • Very Low Phase Noise • Low Cost • • • •
DESCRIPTION
The MAS1175 is an integrated circuit well suited to build VCTCXO for mobile communication. Only two external components are needed. Temperature calibration is achieved with three calibration points only. The trimming is done through a serial bus and the calibration information is stored in an internal PROM. To build a VCTCXO only two additional components, a varactor and a crystal are needed. The compensation method is fully analog. IC compensation work is continuous without generating any steps or other interferences.
FEATURES
• • • • • Very small size Minimum current draw Wide operating temperature range Phase noise <-130 dBc/Hz at 1 kHz offset VCTCXO for mobile phones
APPLICATIONS
• VCTCXO for other telecommunications systems
BLOCK DIAGRAM
DA CLK PV VC
CUB INF SENS LIN
4 4
f(T)
MAS1175
TE1
4
Σ
f(T)
8
T
Vref
TMux
TE2
CDAC1
8
VDD
CDAC2
2
OUT X2 X1
VSS
1 (9)
DA1175.008 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 Buffer Output Symbol VDD PV CLK DA TE1 TE2 VC X1 X2 VSS OUT x-coordinate 263 503 745 1001 1246 1454 190 398 1355 1828 2031 y-coordinate 1330 1326 1321 1321 1325 1325 231 231 231 242 231
Note: Because the substrate of the die is internally connected to VDD, the die has to be connected to VDD or left floating. Make sure that VDD is the first pad to be bonded. Pick-and-place and all component assembly are recommended to be performed in ESD protected area. Note: Pad coordinates are measured from the left bottom corner of the chip to the center of the pads. The coordinates may vary depending on sawing width and location, however, distances between pads are accurate.
ABSOLUTE MAXIMUM RATINGS
Parameter Supply Voltage Input Voltage Power Dissipation Storage Temperature Note: Not valid for programming pin PV Symbol VDD - VSS VIN PMAX TST Min -0.3 VSS -0.3 -55 Max 6.0 VDD + 0.3 20 150 Unit V V mW o C Note 1)
RECOMMENDED OPERATION CONDITIONS
Parameter Supply Voltage Supply Current Operable Temperature Storage Temperature Crystal Pulling Sensitivity Load Capacitance Symbol VDD ICC TC TS S CL Conditions Vcc = 2.8 Volt Relative humidity = 15%…70% -30 -5 30 10 Min 2.7 Typ 2.8 Max 5.5 1.8 +85 +40 Unit V mA o C o C ppm/pF pF
2 (9)
DA1175.008 13 July, 2006
ELECTRICAL CHARACTERISTICS
Parameter Frequency Range Voltage Control Range Voltage Control Sensitivity Output Voltage (10kΩ // 10 pF) Compensation Range ± 2.5 ppm Compensation Range ± 2.0 ppm Compensation Range Linear Part Compensation Inflection Point Compensation Range Cubic Part Compensation CD.