MAS MAS9278

DA9278.004
13 July 2006
MAS9278
IC for 10.00 – 30.00 MHz VCXO
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Low Power
Wide Supply Voltage Range
True Sine Wave Output
Very High Level of Integration
Integrated Varactor
Electrically Trimmable
Very Low Phase Noise
Low Cost
DESCRIPTION
The MAS9278 is an integrated circuit well suited to
build VCXO for mobile communication. The crystal
offset trimming is done through a serial bus and
the calibration information is stored in an internal
PROM.
FEATURES
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To build a VCXO only one additional component, a
crystal, is needed.
APPLICATIONS
Very small size
Minor current draw
Wide operating temperature range
Phase noise <-130 dBc/Hz at 1 kHz offset
Programmable Vc sensitivity
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VCXO for mobile phones
VCXO for other telecommunications systems
Replacement for TCXO modules
BLOCK DIAGRAM
VC
OUT
2
DA
MAS9278
CLK
PV
Digital
VDD
5
2
VSS
X1
X2
XO1
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DA9278.004
13 July 2006
PIN DESCRIPTION
Pin Description
Symbol
x-coordinate
y-coordinate
Power Supply Voltage
Serial Bus Data Input
Serial Bus Clock Input
VDD
DA
CLK
177
435
201
172
1015
1015
Programming Input
Voltage Control Input
Crystal Oscillator Output
Power Supply Ground
Crystal/Varactor Oscillator Input
Buffer Output
PV
VC
X1
VSS
X2
OUT
1042
1012
374
830
817
665
1015
158
158
1008
158
1015
Note: Because the substrate of the die is internally connected to GND, the die has to be connected to GND or
left floating. Make sure that GND 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
Symbol
Min
Max
Unit
Supply Voltage
Input Voltage
Power Dissipation
Storage Temperature
VDD - VSS
VIN
PMAX
TST
-0.3
VSS -0.3
6.0
VDD + 0.3
20
150
V
V
mW
o
C
-55
Note
1)
Note: Not valid for programming pin PV.
RECOMMENDED OPERATION CONDITIONS
Parameter
Supply Voltage
Supply Current
Operating Temperature
Crystal Load Capacitance
Symbol
VDD
ICC
TC
CL
Conditions
Min
Typ
Max
Unit
2.7
2.8
0.85
5.5
V
mA
o
C
pF
Vcc = 2.8 Volt
-30
+85
7.0
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DA9278.004
13 July 2006
ELECTRICAL CHARACTERISTICS
(recommended operation conditions)
Parameter
Symbol
Min
Frequency Range
fo
Voltage Control Range
VC
Voltage Control Sensitivity
Typ
Max
Unit
10.00
30.00
MHz
0
Vdd
Note
VCSENS
15..30
ppm/V
Output Voltage (10kΩ // 10 pF)
Vout
1.0
Vpp
Compensation CDAC1 (2 Bit)
CX1
C10
C10 + 4.5
pF
2)
Compensation CDAC2 (4 Bit)
CX2
C20
C20 + 18
pF
3)
Startup Time
TSTART
2
1)
ms
Note 1: programmable by DN/DP switches
Note 2: typ C10 = 4.5 pF
Note 3: typ C20 = 12.5 pF
IC OUTLINES
DA
OUT
VSS
PV
1182 µm
CLK
MAS9278
VDD
X1
X2
VC
Die map reference
1200 µm
Note 1: MAS9278 pads are round with 80 µm diameter at opening.
Note 2: Pins CLK and DA can either be connected to VSS or left floating and pin PV can either be connected to
VDD or left floating in VCXO module end-user application.
Note 3: Die map reference is the actual left bottom corner of the sawn chip.
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DA9278.004
13 July 2006
SAMPLES IN SB20 DIL PACKAGE
1
20 VDD
2
19
3
18 CLK
4
17 DA
6
MAS9278
YYWW
XXXXX.X
X1 5
16 OUT
15 GND
X2 7
14
8
13
9
12 PV
VC 10
Top marking:
YYWW = Year, Week
XXXXX.X = Lot number
11
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DA9278.004
13 July 2006
ORDERING INFORMATION
Product Code
Version
Package
Comments
MAS9278ATG1
MAS9278A
MAS9278B1TG00
A
A
B
EWS tested wafers 215 µm
SMD Package TBD
EWS tested wafers 215 µm
Larger range of VC sensitivity
Larger range of VC sensitivity
Smaller range of VC sensitivity
See DAE9278 page 4 for definition of versions.
Please contact Micro Analog Systems Oy for other wafer thickness options.
LOCAL DISTRIBUTOR
MICRO ANALOG SYSTEMS OY CONTACTS
Micro Analog Systems Oy
Kamreerintie 2, P.O. Box 51
FIN-02771 Espoo, FINLAND
Tel. +358 9 80 521
Fax +358 9 805 3213
http://www.mas-oy.com
NOTICE
Micro Analog Systems Oy reserves the right to make changes to the products contained in this data sheet in order to improve the design or
performance and to supply the best possible products. Micro Analog Systems Oy assumes no responsibility for the use of any circuits
shown in this data sheet, conveys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no
claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and
Micro Analog Systems Oy makes no claim or warranty that such applications will be suitable for the use specified without further testing or
modification.
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