DA9271.005
13 July 2006
MAS9271
IC FOR 10.00 – 40.00 MHz PXO
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DESCRIPTION
The MAS9271 is an integrated circuit well suited to
make initial offset trimming of the crystal in
oscillator. The trimming is done by a serial bus and
the calibration information is stored in an internal
PROM.
To build a Precision Crystal Oscillator (PXO) only
one additional component, a crystal is needed.
Low Power
Wide Supply Voltage Range
CMOS (Square Wave) Output
Very High Level of Integration
Electrically Trimmable
Very Low Phase Noise
Low Cost
FEATURES
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Very small size
Minimum current draw
Wide operating temperature range
Phase noise <-130 dBc/Hz at 1 kHz offset
Square wave output
APPLICATIONS
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PXO for data terminals
PXO for telecommunication applications
PXO for computer application
BLOCK DIAGRAM
PD
MAS9271
OUT
DA
CLK
PV
VDD
Digital
3
5
VSS
X1
X'Tal
X2
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DA9271.005
13 July 2006
PIN DESCRIPTION
Pin Description
Power Supply Voltage
Crystal Oscillator Output
Crystal/Varactor Oscillator Input
Tri State
Serial Bus Clock Input
Serial Bus Data Input
Buffer Output
Power Supply Ground
Programming Input
Symbol
VDD
X1
X2
PD
CLK
DA
OUT
VSS
PV
x-coordinate
177
374
817
1012
201
435
665
830
1042
y-coordinate
172
158
158
158
1015
1015
1015
1008
1015
Note
Note:
Also available in AK2140 pin order.
Note:
Because the substrate of the die is internally connected to VDD, the die has to be connected to VDD or
left floating. Please 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 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
V
DD
- V
SS
V
IN
P
MAX
T
ST
Min
-0.3
V
SS
-0.3
-55
Max
6.0
V
DD
+ 0.3
100
150
Unit
V
V
mW
o
C
Note
1)
RECOMMENDED OPERATION CONDITIONS
Parameter
Supply Voltage
Supply Current
Operating Temperature
Crystal Load Capacitance
Symbol
V
DD
I
CC
T
C
C
L
Conditions
Vdd = 2.8 Volt
-40
8.0
Min
2.5
Typ
2.8
2.3
Max
5.5
+85
Unit
V
mA
o
C
pF
2 (5)
DA9271.005
13 July 2006
ELECTRICAL CHARACTERISTICS
(recommended operation conditions)
Parameter
Frequency Range
Output Voltage (10 pF, Vdd 2.7V)
Output Voltage (10 pF, Vdd 5.0V)
Rise and Fall Time (10 - 50pF)
Output Symmetry
Crystal Load
Startup Time
Symbol
f
o
V
out
V
out
Min
10.00
Typ
Max
40.00
Unit
MHz
Vpp
Vpp
Note
1)
2.3
4.5
10
45
55
11.5
2
ns
%
pF
ms
2)
C
G
T
START
5.1
Negative Resistance in Maximum
NegR
85
CDAC Load at 32 MHz
Negative Resistance in Maximum
NegR
40
CDAC Load at 40 MHz
Tri State Output Buffer
PD
V
3)
ON State
1.6
VDD
OFF State
0
0.55
Note 1:
Rs < 10
Ω
crystal provides typically a maximum frequency of 40 MHz and Rs<30
Ω
a maximum
frequency of 32 MHz. With Rs = 50
Ω
crystal the maximum frequency is typically 26 MHz.
Note 2:
Crystal Load is at minimum when all CDAC bits are 0s, and at maximum when all CDAC bits are 1s
Note 3:
If the Tri State Output Buffer pin is floating (i.e. PD pin is not connected), the Oscillator is in ON state.
IC OUTLINES
CLK
DA
OUT
VSS
PV
1182 µm
MAS9271
VDD
X1
X2
PD
Die map reference
1200 µm
Note 1:
Also available in AK2140 pin order.
Note 2:
MAS9271 pads are round with 80 µm diameter at opening.
Note 3:
Pins PV, CLK and DA must not be connected in PXO module end-user application.
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DA9271.005
13 July 2006
SAMPLES IN SB20 DIL PACKAGE
1
2
3
4
MAS9271
YYWW
XXXXX.X
20
VDD
19
18
CLK
17
DA
16
OUT
15
GND
14
13
12
PV
11
X1
5
6
Top marking:
YYWW = Year, Week
XXXXX.X = Lot number
X2
7
8
9
PD
10
4 (5)
DA9271.005
13 July 2006
ORDERING INFORMATION
Product Code
MAS9271A1TG00
Product
IC FOR PXO
Package
Tested wafers 215 µm
Comments
Die size 1200 x 1182 µm
Please contact Micro Analog Systems Oy for other wafer thickness options.
Please contact Micro Analog Systems Oy for other pin order
.
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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