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MMA1260 Datasheet PDF : 9 Pages
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Table 2. Operating Characteristics
(Unless otherwise noted: –40°C ≤ TA ≤ +105°C, 4.75 ≤ VDD ≤ 5.25, Acceleration = 0g, Loaded output.(1))
Characteristic
Symbol
Min
Typ
Max
Unit
Operating Range(2)
Supply Voltage(3)
Supply Current
Operating Temperature Range
Acceleration Range
VDD
4.75
5.00
5.25
V
IDD
1.1
2.2
3.2
mA
TA
–40
—
+105
°C
gFS
—
1.55
—
g
Output Signal
Zero g (TA = 25°C, VDD = 5.0 V)(4)
Zero g (VDD = 5.0 V)
Sensitivity (TA = 25°C, VDD = 5.0 V)(5)
Sensitivity (VDD = 5.0 V)
Bandwidth Response
Nonlinearity
VOFF
VOFF
S
S
f–3dB
NLOUT
2.25
2.2
1140
1110
40
–1.0
2.5
2.5
1200
1200
50
—
2.75
2.8
1260
1290
60
+1.0
V
V
mV/g
mV/g/V
Hz
% FSO
Noise
RMS (0.1 Hz – 1.0 kHz)
Spectral Density (RMS, 0.1 Hz – 1.0 KHz)(6)
nRMS
—
nSD
—
5.0
9.0
mVrms
500
—
µg/ Hz
Self-Test
Output Response (VDD = 5.0 V)
Input Low
Input High
Input Loading(7)
Response Time(8)
Status(9), (10)
Output Low (Iload = 100 µA)
Output High (Iload = 100 µA)
∆VST
0.3
0.6
0.9
V
VIL
VSS
—
0.3 VDD
V
VIH
0.7 VDD
—
VDD
V
IIN
–50
–25
–300
µA
tST
—
10
25
ms
VOL
—
—
0.4
V
VOH
VDD – 0.8
—
—
V
Output Stage Performance
Electrical Saturation Recovery Time(11)
Full Scale Output Range (IOUT = 200 µA)
Capacitive Load Drive(12)
Output Impedance
tDELAY
—
—
2.0
ms
VFSO
VSS + 0.25
—
VDD – 0.25
V
CL
—
—
100
pF
ZO
—
50
—
Ω
Mechanical Characteristics
Transverse Sensitivity(13)
VXZ,YZ
—
—
5.0
% FSO
1. For a loaded output the measurements are observed after an RC filter consisting of a 1 kΩ resistor and a 0.01 µF capacitor to ground.
2. These limits define the range of operation for which the part will meet specification.
3. Within the supply range of 4.75 and 5.25 volts, the device operates as a fully calibrated linear accelerometer. Beyond these supply limits the
device may operate as a linear device but is not guaranteed to be in calibration.
4. The device can measure both + and – acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output
will increase above VDD/2 and for negative acceleration the output will decrease below VDD/2.
5. The device is calibrated at 5g.
6. At clock frequency ≅70 kHz.
7. The digital input pin has an internal pull-down current source to prevent inadvertent self test initiation due to external board level leakages.
8. Time for the output to reach 90% of its final value after a self-test is initiated.
9. The Status pin output is not valid following power-up until at least one rising edge has been applied to the self-test pin. The Status pin is high
whenever the self-test input is high, as a means to check the connectivity of the self-test and Status pins in the application.
10. The Status pin output latches high if a Low Voltage Detection or Clock Frequency failure occurs, or the EPROM parity changes to odd. The
Status pin can be reset low if the self-test pin is pulsed with a high input for at least 100 µs, unless a fault condition continues to exist.
11. Time for amplifiers to recover after an acceleration signal causes them to saturate.
12. Preserves phase margin (60°) to guarantee output amplifier stability.
13. A measure of the device's ability to reject an acceleration applied 90° from the true axis of sensitivity.
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