DA9285.004
13 July 2006
IC FOR XO TRIMMING
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DESCRIPTION
MAS9285 is capacitive digital to analog converter
integrated circuit well suited to make initial offset
trimming of the crystal oscillator. The trimming is
done by a serial bus and the calibration information
is stored in an internal PROM.
MAS9285
Very Low Power
Wide Trimming Range
Wide Supply Voltage Range
Very High Level of Integration
Electrically Trimmable
Low Cost
FEATURES
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Very small size
Minimum current draw
Wide operating temperature range
APPLICATIONS
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OCXO
All Crystal Oscillators
BLOCK DIAGRAM
MAS9285
DA
CLK
PV
VDD
Digital
2
3
5
VSS
X1
Figure 1. Block diagram of MAS9285.
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DA9285.004
13 July 2006
PIN DESCRIPTION
Pin Description
Serial Bus Data Input
Serial Bus Clock Input
Programming Input
Power Supply Voltage
Power Supply Ground
CDAC Output with Bias Option
Symbol
DA
CLK
PV
VDD
VSS
X1
x-coordinate
192
425
656
161
368
629
y-coordinate
152
152
158
855
855
871
Note
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
Operable Temperature
Symbol
V
DD
I
CC
T
C
Conditions
Vdd = 3.3 Volt
-40
Min
2.5
Typ
2.8
7
Max
5.5
50
+85
Unit
V
A
o
C
ELECTRICAL CHARACTERISTICS
(recommended operation conditions)
Parameter
Operation Frequency
Symbol
Min
Typ
Max
200
Unit
MHz
Note
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DA9285.004
13 July 2006
IC OUTLINES
VDD
VSS
X1
MAS9285
940 µm
DA
CLK
PV
Die map reference
794 µm
Figure 2. IC outline of MAS9285.
Note 1:
MAS9285 pads are round with 80 µm diameter at opening.
Note 2:
Pins PV, CLK and DA must not be connected in XO module end-user application.
APPLICATION
MAS9285
DA
CLK
PV
VDD
Digital
2
3
5
VSS
X1
VC
OUT
155MHz VCXO
X1
X'Tal
X2
Figure 3. Typical application for MAS9285
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DA9285.004
13 July 2006
PIN CONFIGURATION (TSOT-6)
TSOT-6
VDD
DA
CLK
6
5
4
85AX
1
X1
2
VSS
3
PV
85AX = Product version (MAS9285AX, where x = number)
PIN DESCRIPTION (TSOT-6)
Pin Name
X1
VSS
PV
CLK
DA
VDD
Pin Number
in TSOT-6
1
2
3
4
5
6
Type
O
G
I
I
I
P
Function
CDAC Output with Bias Option
Power Supply Ground
Programming Input
Serial Bus Clock Input
Serial Bus Data Input
Power Supply Voltage
G = Ground, I = Input, O = Output, P = Power
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DA9285.004
13 July 2006
PIN CONFIGURATION (QFN-6)
QFN-6
PV
CLK
DA
X1
VSS
VDD
851 = Product version (MAS9285A1)
XXX = MAS lot number (3 last digit)
851
XXX
PIN DESCRIPTION (QFN-6)
Pin Name
X1
VSS
VDD
DA
CLK
PV
Pin Number
in TSOT-6
1
2
3
4
5
6
Type
O
G
I
I
I
P
Function
CDAC Output with Bias Option
Power Supply Ground
Power Supply Voltage
Serial Bus Data Input
Serial Bus Clock Input
Programming Input
G = Ground, I = Input, O = Output, P = Power
Exposed pad* can be connected to ground or left floating
* see package outline information on page 8
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