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DA1173.001
May 27, 1999
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The MAS1173 is an integrated oscillator circuit with
dual true sine wave output buffers, well suited for
mobile communications applications. Only one
external component, the crystal, is used. Offset
calibration is achieved by a serial interface, which
could also be used to track temperature drift of the
crystal by the same serial interface.
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Small size
Minimum current draw
Wide operating temperature range
DCXO to mobile phones
DCXO to other telecommunications systems
GV5G
I
VDD
VSS
CDAC-Register
5 Bit Coarse / 7 Bit Fine Resolution
SDA
SCL
OUT2
OUT1
X1
X2
I2C-Bus; Address = 1101'000X
This is preliminary information on a new
product under development. Micro Analog
Systems reserves the right to make any
changes without notice.
3
DA1173.001
May 27, 1999
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Output Voltage (10k
// 10 pF)
V
out1
1.0
Vpp
Output Voltage (10k
// 10 pF)
V
out2
1.0
Vpp
Coarse CDAC (5 Bit)
C
CSTEP
135
fF
Fine CDAC (7 Bit)
C
FSTEP
12
fF
Startup Time
T
START
10
ms
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The offset adjustment is achieved with two steps,
first the coarse register is adjusted while the fine
tuning register is set to middle position. After that
the fine tuning register is used for the final
adjustment.
The I2C bus is organized so that only one address
is used for the coarse and fine tuning. After the
address the seven bit fine tuning is written followed
by the five bit coarse register. Always eight bits are
written according to I2C standard. The seven and
five bits are filled with zeros in front (the MSB
place).
5
DA1173.001
May 27, 1999
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MAS1173ATAA
IC FOR DCXO
Tested wafers
Die size 1,392 x 1.386mm
2
MAS1173ASAA
IC FOR DCXO
SO-8
MAS1173ASAA-T
IC FOR DCXO
SO-8
Taped and Reeled
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Micro Analog Systems Oy
Kamreerintie 2, P.O. Box 51
FIN-02771 ESPOO, FINLAND
http://www.mas-oy.com
Tel. (09) 80521
Tel. Int. +358 9 80521
Telefax +358 9 8053213
E-mail: i
nfo
@mas-oy.com
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.
Purchase of I
2
C components of Micro Analog Systems Oy, Kamreerintie 2, FIN-02770 Espoo, Finland, conveys a license under
the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system conforms to the I
2
C Standard
Specification as defined by Philips.
NOTICE
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