ADXL190WQC ,Low Cost +-100 gSingle Axis Accelerometer with Analog OutputSPECIFICATIONSA MIN MAX S ADXL190WQCParameter Conditions Min Typ Max UnitsSENSOR INPUT1, 2, 3Dyn ..
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AM2833DC , 1024-Bit Static Shift Registers
AM2841ADC ,64 x 4 BITS FIRST-IN FIRST-OUT MEMORIESAm3341/ 2841/ 2841A
Distinctive Characteristics
. "Plug- In" replacement for Fairchild 3341
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AM2841PC ,64 x 4 BITS FIRST-IN FIRST-OUT MEMORIESBLOCK DIAGRAM
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Parallel expansion to wider words only requires that rows of FIFOs
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AM28F010-120EI , 1 Megabit (128 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory
ADXL190WQC
Low Cost +-100 gSingle Axis Accelerometer with Analog Output
REV.0
Low Cost 6100 gSingle Axis
Accelerometer with Analog Output
FUNCTIONAL BLOCK DIAGRAMiMEMS is a registered trademark of Analog Devices, Inc.
*Patent Pending.
FEATURES
iMEMS® Single Chip IC Accelerometer
40 Milli-g Resolution
Low Power 2 mA
400 Hz Bandwidth
+5.0 V Single Supply Operation
2000 g Shock Survival
APPLICATIONS
Shock and Vibration Measurement
Machine Health
Shipping Recorders
Military Fuze, Safe and Arm
GENERAL DESCRIPTIONThe ADXL190 is a complete acceleration measurement system
on a single monolithic IC. It contains a polysilicon surface-
micromachined sensor and signal conditioning circuitry to
implement an open-loop acceleration measurement architecture.
The ADXL190 is capable of measuring both positive and nega-
tive accelerations up to –100 g, making it suitable for shock and
vibration measurement.
Typical noise floor is 4 mg/√Hz allowing signals below 40 milli-g
to be resolved. The ADXL190 can measure both dynamic accel-
erations, (typical of vibration) or static accelerations, (such as
inertial force or gravity).
The ADXL190 has a two-pole Bessel switched-capacitor filter.
Bessel filters, sometimes called linear phase filters, have a step
response with minimal overshoot and a maximally flat group
delay. The –3 dB frequency of the poles is preset at the factory
to 400 Hz. These filters are also completely self-contained and
buffered, requiring no external components.
The product features a built-in self-test feature that exercises
both the mechanical structure and electrical circuitry. When
triggered by a logic high on the self-test pin, an electrostatic
force acts on the beam equivalent to approximately 20% of full-
scale acceleration input, and thus a proportional voltage change
appears on the output pin. No external components other than a
decoupling capacitor are required.
The ADXL190 is available in a hermetic 14-lead surface mount
cerpak, specified over the –40°C to +105°C temperature range.
ADXL190–SPECIFICATIONSNOISE PERFORMANCE
FREQUENCY RESPONSE
ANALOG OUTPUT
NOTESProduct is tested at –50 g, and the combination of 0-g error, sensitivity error, and output voltage swing measurements provide the calculations for dynamic range.0-g is nominally VS/2. Use of the 0-g adjustment pin is used to null the 0-g error, resulting in increased dynamic range. It can also be used to create an asymmetrical
dynamic range if so desired.The output response is ratiometric and is described by the following equation. VOUT (accel, VS) = [VS/2 –(a VS/5 V)] + [(accel) (b VS + c VS2)(1 – 0.08)]
Where a = 0.2 V, b = 2.712 · 10–3 1/g , c = 0.178 · 10–3 1/g/V.Measured at 100 Hz, –50 g.Specification refers to the maximum change in parameter from its initial value at +25°C to its worst case value at TMIN or TMAX.ST pin Logic “0” to “1”; DVOUT = (DVOUT @ 5 V) · (VS/5 V).
All min and max specifications are guaranteed. Typical specifications are not tested or guaranteed.
Specifications subject to change without notice.
(TA = TMIN to TMAX, VS = +5 V, Acceleration = 0 g unless otherwise noted)
ABSOLUTE MAXIMUM RATINGS*Acceleration (Any Axis, Unpowered for 0.5 ms) . . . . . .2000 g
Acceleration (Any Axis, Powered for 0.5 ms) . . . . . . . .1000 g
+VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +7.0 V
Short Circuit Duration (Any Pin to Common) . . . .Indefinite
Operating Temperature . . . . . . . . . . . . . . . .–55°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . .–65°C to +150°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-nent damage to the device. This is a stress rating only; the functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Drops onto hard surfaces can cause shocks of greater than 2000 g
and exceed the absolute maximum rating of the device. Care
should be exercised in handling to avoid damage.
PIN FUNCTION DESCRIPTIONS
PACKAGE CHARACTERISTICS
PIN CONFIGURATION
COMMON
VOUT
SELF-TEST
ZERO g ADJUST
NC = NO CONNECT
TEST POINT
(DO NOT CONNECT)Figure 1 shows the response of the ADXL190 to the earth’s
gravitational field. The output values shown are nominal. They
are presented to show the user what type of response to expect
from each of the output pins due to changes in orientation with
respect to the earth.
TYPICAL OUTPUT AT
PIN 10 = 2.500V
PIN 1
TYPICAL OUTPUT AT
PIN 10 = 2.482V
PIN 1
TYPICAL OUTPUT AT
PIN 10 = 2.500V
PIN 1
TYPICAL OUTPUT AT
PIN 10 = 2.518V
PIN 1Figure 1.ADXL190 Response Due to Gravity
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADXL190 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
ORDERING GUIDE
ADXL190
APPLICATIONSAll the circuitry needed to drive the sensor and convert the
capacitance change to voltage is incorporated on-chip requiring
no external components except for standard power supply de-
coupling. Both sensitivity and the zero-g value are ratiometric to
the supply voltage, so that ratiometric devices following the
accelerometer (such as an ADC, etc.) will track the accelerom-
eter if the supply voltage changes. The output voltage (VOUT) is
a function of both the acceleration input (a) and the power
supply voltage (VS) as follows:
VOUT = VS/2 – (Sensitivity · VS/5 V · a)
Adjusting the 0 g Bias LevelIn some cases the user may have an asymmetrical input or may
want to fine adjust the zero-g output level to obtain maximum
dynamic range. The zero-g level is adjusted by supplying a
voltage to the zero-g adjustment pin (see Figure 2).
VOUT
+VS
200kV
0.1mFFigure 2.Optional Zero-g Adjust Circuit Detail
Any voltage difference between the zero-g adjustment pin and
VS/2 is reduced by a factor of 6 by the internal resistor divider.
This is then gained by the factor of 3 in the output stage for a
total gain of 0.5 for the zero-g adjustment. (Note: The ratio of
the resistors in the divider is consistent from part-to-part; how-
ever, the absolute values can have a –30% tolerance). The
zero-g adjustment voltage can be set up by a variety of methods
including a potentiometer (as shown in Figure 2), a PWM sig-
nal, or with a simple three-state output.
The simplest way is by adding a resistor between the ZERO g
ADJUST pin and VS or ground. The output will be offset by:
Offset (V) = (7.5 · VS)/(30 + R)
where R is in kW and connected to VS.
Offset (V) = (–7.5 · VS)/(30 + R)
where R is in kW and connected to ground.
Resistors may also be connected to microcontroller I/O pins as
shown in Figure 3. Using two I/Os that may be set to VS, ground,
or three-state, there are seven possibilities as shown in Table I
(one cannot set one I/O pin to VS and the other to ground).
Using such a system, any ADXL190 may be user trimmed to
output 2.5 V – 35 mV at zero g.
Table I.Offsets Produced Using the Circuit in Figure 3 for VS
= 5 VAnother way to adjust the zero g offset is to supply a voltage to
the ZERO g ADJUST pin. The difference between VS/2 and
the voltage at the ZERO g ADJUST pin is reduced by a factor
of 6 (as a result of the internal 5 kW and 25 kW voltage divider)
and then multiplied by a factor of 3 in the output stage of the
ADXL190 resulting in a total gain of 0.5. Offset is thus de-
scribed by the following equation:
Offset (V) = (Voltage at the ZERO g ADJUST Pin – VS/2)/2
This voltage may be produced by a variety of methods includ-
ing a PWM signal from a microcontroller. Care must be taken
that the output impedance of this voltage source is less than
5 kW and that there is very little ripple (noise). Any noise at the
ZERO g ADJUST pin will cause output errors.
If an asymmetric range of acceleration is required (e.g., +75 g
to –125 g) a resistor may be connected between the ZERO g
ADJUST and ground or VS as described above. For example:
For a range of +75 g to –125 g the offset required is –25 g.
–25 g at 18 mV/g = 450 mV of offset is required.
Rearranging the offset equations above:
R = [(7.5 · VS)/offset] –30 = 53.3 kW connected to ground.
For asymmetric operation the g range midpoint may be shifted
up to –80 g typically.
Figure 3.An Offset Adjustment Scheme
OUTLINE DIMENSIONSDimensions shown in inches and (mm).
14-Lead Cerpak
(QC-14)C3457–8–2/99
PRINTED IN U.S.A.
:
www.ic-phoenix.com
.
