ADS8556 Datasheet, PDF (40/47 Pages) Texas Instruments – 16-14-12-Bit Six-Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTERS

ADS8556, ADS8557, ADS8558
SBAS404D – OCTOBER 2006 – REVISED FEBRUARY 2016
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10.2 Layout Example
Figure 47 shows a layout recommendation for the ADS855x along with the proper decoupling and reference
capacitor placement and connections.
ADS8556/7/8
Top View
To
BVDD
To AVDD
To AVDD
0.1mF 10mF 10mF 10mF 0.47mF 0.1mF
64 63 62 61
58
56
54
51
1
2
3
4
5
6
7
1 ^BGND
mF _BVDD
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24
27 28 29
48
0.1
mF
AVDD
AVDD
45
0.1
mF
AGND
AGND
42
0.1
mF
AVDD
AVDD
39
0.1
mF
AGND
AGND
0.1
36 _mF
AVDD
AVDD
33
0.1
mF
0.1mF
0.1mF
0.1mF
To DUT
AVDD Source
10
mF
To AVDD
To AVDD
To AVDD
10mF
10mF
LEGEND
TOP layer; copper pour and traces
Lower layer; AGND area
Lower layer; BGND area
Via
To
AVDD
To
HVSS/HVDD
(1) All 0.1-μF, 0.47-μF, and 1-μF capacitors must be placed as close to the device as possible.
(2) All 10-μF capacitors must be close to the device but without compromising the placement of the smaller capacitors.
Figure 47. Layout Recommendation
40
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