CMA3000-A0X VTI Hamlin, CMA3000-A0X Datasheet - Page 8

• Manufacturer Part Number: CMA3000-A0X
• Description: Cma3000-a0x Series 3-axis Accelerometer
• Manufacturer: VTI Hamlin

4.3 Recommended PWB layout
VTI Technologies Oy
www.vti.fi
Please note that CMA3000-A0X has internal 32kOhm resistors in series with all analog outputs.
Due to this internal resistor the resulting signal bandwidth of CMA3000 will be a function of the C
as follows:
where C
presented in Table 5 below.
Table 5. CMA3000 pin descriptions.
Below are general PWB layout recommendations for CMA3000 products (refer to Figure 5 and
Figure 6):
1. Locate 100 nF SMD capacitors right next to the CMA3000 package.
2. Use double sided PWB, connect the bottom side plane to GND.
Recommended PWB pad layout for CMA3000 is presented in Figure 6 below (dimensions in
micrometers, [µm]).
Recommended PWB layout for the CMA3000-A0X is presented in Figure 7 below (circuit diagram
presented in Figure 5 above).
-3dB cut off frequency
Figure 6. Recommended PWB pad layout for CMA3000.
Signal bandwitdh,
106 Hz
L
50 Hz
23 Hz
11 Hz
is the load capacitance presented in Figure 5. Some example signal bandwidths are
f
−
3
PRELIMINARY - Subject to changes
dB
=
2
Doc.Nr. 8282100.05
π
⋅
Load capacitance, C
1
R
⋅
C
L
100 nF
220 nF
470 nF
=
47 nF
2
π
⋅
32
1
k
Ω
L
⋅
C
L
,
CMA3000-A0X Series
Rev.05
L
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