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2.5
Dynamic Electrical Characteristics - Signal Chain
V L ≤ (V CC - V SS ) ≤ V H , T L ≤ T A ≤ T H , | Δ T A | < 25 K/min unless otherwise specified
#
Characteristic
Symbol
Min
Typ
Max
Units
94
95
96
DSP Sample Rate (LPF 0,1,2,3,4,5)
DSP Sample Rate (LPF 8,9,10,11,12,13)
Interpolation Sample Rate
t S
t S
t INTERP
?
?
?
64/f OSC
128/f OSC
t S /2
?
?
?
s
s
s
(7)
(7)
(7)
97
98
Datapath Latency (excluding g-cell and Low Pass Filter)
T S = 64/f OSC
T S = 128/f OSC
*
*
t DataPath_8
t DataPath_16
33.0
51.9
34.8
54.6
36.5
57.4
μ s
μ s
(7, 16)
(7, 16)
Low-Pass Filter (t s = 8 μ s)
99
100
101
102
103
104
Cutoff frequency 0: 100 Hz, 4-pole
Cutoff frequency 1: 300 Hz, 4-pole
Cutoff frequency 2: 400 Hz, 4-pole
Cutoff frequency 3: 800 Hz, 4-pole
Cutoff frequency 4: 1000 Hz, 4-pole
Cutoff frequency 5: 400 Hz, 3-pole
*
*
*
*
*
*
f C0(LPF)
f C1(LPF)
f C2(LPF)
f C3(LPF)
f C4(LPF)
f C5(LPF)
95
285
380
760
950
380
100
300
400
800
1000
400
105
315
420
840
1050
420
Hz
Hz
Hz
Hz
Hz
Hz
(3, 7, 17)
(7, 17)
(7, 17)
(7, 17)
(7, 17)
(7, 17)
Low-Pass Filter (t s = 16 μ s)
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
Cutoff frequency 8: 50 Hz, 4-pole
Cutoff frequency 9: 150 Hz, 4-pole
Cutoff frequency 10: 200 Hz, 4-pole
Cutoff frequency 11: 400 Hz, 4-pole
Cutoff frequency 12: 500 Hz, 4-pole
Cutoff frequency 13: 200 Hz, 3-pole
Offset Cancellation (Normal Mode, 10-Bit Output)
Offset Averaging Period
Offset Slew Rate
Offset Update Rate
Offset Correction Value per Update Positive
Offset Correction Value per Update Negative
Offset Correction Threshold Positive
Offset Correction Threshold Negative
Offset Monitor Bypass Time after Self-Test Deactivation
Time Between Acceleration Data Requests
Arming Output Activation Time (ARM, I ARM = 200 μ A)
Moving Average and Count Arming Modes (2,3,4,5)
Unfiltered Mode Activation Delay (Reference Figure 28 )
Unfiltered Mode Arm Assertion Time (Reference Figure 28 )
Sensing Element Natural Frequency (-40°C ≤ T A ≤ 105°C)
Sensing Element Cutoff Frequency (-3 dB ref. to 0 Hz, -40°C ≤ T A ≤ 105°C)
Sensing Element Damping Ratio (-40°C ≤ T A ≤ 105°C)
Sensing Element Delay (@100 Hz, -40°C ≤ T A ≤ 105°C)
Package Resonance Frequency
Package Quality Factor
*
*
*
*
*
*
*
*
*
*
*
*
*
f C8(LPF)
f C9(LPF)
f C10(LPF)
f C11(LPF)
f C12(LPF)
f C13(LPF)
OFF AVEPER
OFF SLEW
OFF RATE
OFF CORRP
OFF CORRN
OFF THP
OFF THN
t ST_OMB
t ACC_REQ
t ARM
t ARM_UF_DLY
t ARM_UF_ASSERT
f gcell
f gcell
ζ gcell
f gcell_delay
f Package
q Package
47.5
142.5
190
380
475
190
?
?
?
?
?
?
?
?
15
0
0
5.00
10791
0.851
2.46
70
100
1
50
150
200
400
500
200
6.291456
0.2384
1049
0.25
-0.25
0.125
0.125
320
?
?
?
?
?
?
?
?
?
?
52.5
157.5
210
420
525
210
?
?
?
?
?
?
?
?
?
1.05
1.05
6.579
15879
2.29
9.36
187
?
5
Hz
Hz
Hz
Hz
Hz
Hz
s
LSB/s
ms
LSB
LSB
LSB
LSB
t S
μ s
μ s
μ s
μ s
Hz
kHz
?
μ s
kHz
(7, 17)
(7, 17)
(7, 17)
(7, 17)
(7, 17)
(7, 17)
(7)
(7)
(7)
(7)
(7)
(7)
(7)
(3, 7)
(3, 7, 20)
(3, 12)
(3, 12)
(3)
(19)
(19)
(19)
(19)
(19)
(19)
MMA685x
Sensors
8
Freescale Semiconductor, Inc.
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