MMA16XXKW FREESCALE [Freescale Semiconductor, Inc], MMA16XXKW Datasheet - Page 20

• Manufacturer Part Number: MMA16XXKW
• Description: DSI Inertial Sensor
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

20
3.5
3.5.1 Transducer
3.5.2
data stream at a nominal frequency of 1 MHz.
3.5.3 Digital Signal Processing Block
the signal processing flow within the DSP block is shown in
MMA16xxKW
The device transducer is an overdamped mass-spring-damper system described by the following transfer function:
where:
Reference
The sigma delta converter provides the interface between the g-cell and the DSP block. The output of the
A digital signal processing (DSP) block is used to perform signal filtering and compensation operations. A diagram illustrating
-------------------------------- -
D
Sinc Filter
n
= Damping Ratio
C = C
1 z D
= Natural Frequency = 2
C
C
–
1 z 1 –
TOP
BOT
Acceleration Signal Path
_OUT
–
–
g-cell
TOP
A
Converter
Section 2.8
- C
3
BOT
B
a
V = C x V
0
n
---------------------------------------------------------------------------- -
d
for transducer parameters.
11
11
1
+
+
=
n
d
12
12
C
X
V
INT1
/ C
f
n
X
z 1 –
z 1 –
INT1
+
+
Low-Pass Filter
n
d
13
13
Figure 12.
1
z 2 –
z 2 –
INTEGRATOR
Figure 13. Signal Chain Diagram
H s
1 - z
FIRST
n
---------------------------------------------------------------------------- -
d
z
21
21
-1
+
+
-1
=
n
d
22
22
------------------------------------------------------
s
Converter Block Diagram
2
z 1 –
z 1 –
+
Figure
2
+
+
2
n
d
23
23
13.
2
n
z 2 –
z 2 –
n s
+
C
Compensation
2
n
2
INTEGRATOR
V = 2
SECOND
1 - z
z
-1
-1
D
V
REF
Output
Scaling
QUANTIZER
Freescale Semiconductor, Inc.
1-BIT
ADC
DAC
E
Interpolation
converter is a
OUTPUT
_OUT
F
Sensors