SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc.
1445 NW Mall Street, Issaquah, WA 98027-5344 Phone: 425-391-8329 Fax: 425-391-0446
web site: www.silicondesigns.com
[page 3]
Aug 05
PINOUT
(LCC & JLCC PACKAGES)
()
()
∆ AO P AO N
k V
V
DV
DD
−≈
− 1
2
2
RECOMMENDED CONNECTIONS
Model 1221 Low Noise Analog Accelerometer
$%62/87(0$;,0805$7,1*6 *
Case Operating Temperature ........................................... -55 to +125°C
Storage Temperature ................................................. -55 to +125°C
Acceleration Over-range ............................................ 2000g for 0.1 ms
Voltage on V
DD to GND ................................................. -0.5V to 6.5V
Voltage on Any Pin (except DV) to GND
4
.............................. -0.5V to V
DD+0.5V
Voltage on DV to GND
5 ...................................................... ±15V
Power Dissipation......................................................... 50 mW
Note 4: Voltages on pins other than DV, GND or V
DD may exceed 0.5 volt above or below the supply voltages provided the current is limited to 1 mA..
Note 5: The application of DV voltages higher than required to bring the output to positive full scale may cause device damage.
* NOTICE: Stresses greater than those listed above may cause permanent damage to the device. These are stress ratings only.
Functional operation of the device at or above these conditions is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
The 2.5V reference input (pin 17) may be driven from either a precision voltage source by the capacitively bypassed
resistive divider shown above.
DEFLECTION VOLTAGE (DV) TEST INPUT: This test input applies an electrostatic force to the sense element,
simulating a positive acceleration. It has a nominal input impedance of 32 k
$ and a nominal open circuit voltage of
½ V
DD. For best accuracy during normal operation, this input should be left unconnected or connected to a voltage
source equal to ½ of the V
DD supply.
The change in differential output voltage (AOP - AON) is proportional to the
square of the difference between the voltage applied to the DV input (V
DV) and
½ V
DD.
Only positive shifts in the
output voltage may be generated by applying voltage to the DV input. When voltage is applied to the DV input, it
should be applied gradually. The application of DV voltages greater than required to bring the output to positive full
scale may cause device damage. The proportionality constant (k) varies for each device and is not characterized.
ESD and LATCH-UP CONSIDERATIONS: The model 1221 accelerometer is a CMOS device subject to damage
from large electrostatic discharges. Diode protection is provided on the inputs and outputs but care should be
exercised during handling to assure that the device is placed only on a grounded conductive surface. Individuals and
tools should be grounded before coming in contact with the device. Do not insert the model 1221 into (or remove it
from) a powered socket.
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