CMA3000-A0X Series
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
L
as follows:
f
−
3
dB
=
1
1
=
2
π
⋅
R
⋅
C
L
2
π
⋅
32
k
Ω ⋅
C
L
,
where C
L
is the load capacitance presented in Figure 5. Some example signal bandwidths are
presented in Table 5 below.
Table 5. CMA3000 pin descriptions.
Signal bandwitdh,
-3dB cut off frequency
106 Hz
50 Hz
23 Hz
11 Hz
Load capacitance, C
L
47 nF
100 nF
220 nF
470 nF
4.3
Recommended PWB layout
Below are general PWB layout recommendations for CMA3000 products (refer to Figure 5 and
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]).
Figure 6. Recommended PWB pad layout for CMA3000.
Recommended PWB layout for the CMA3000-A0X is presented in Figure 7 below (circuit diagram
presented in Figure 5 above).
VTI Technologies Oy
www.vti.fi
PRELIMINARY - Subject to changes
Doc.Nr. 8282100.05
8/ 17
Rev.05
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