ADS131M08IPBSR datasheet(103/118 Pages) TI2

103 / 118 page

Current (A)

100

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

D005

30°

60°

-30°

-60°

Figure 9-9. Cumulative Reactive Energy % Error Versus Current

10 Power Supply Recommendations

10.1 CAP Pin Behavior

The ADS131M08 core digital voltage of 1.8 V is created from an internal LDO from DVDD. The CAP pin outputs

the LDO voltage created from the DVDD supply and requires an external bypass capacitor. When operating from

DVDD > 2.7 V, place a 220-nF capacitor on the CAP pin to DGND. If DVDD ≤ 2 V, tie the CAP pin directly to the

DVDD pin and decouple the star-connected pins using a 100-nF capacitor to DGND.

10.2 Power-Supply Sequencing

The power supplies can be sequenced in any order but the analog and digital inputs must never exceed the

respective analog or digital power-supply voltage limits.

10.3 Power-Supply Decoupling

Good power-supply decoupling is important to achieve optimum performance. AVDD and DVDD must each be

decoupled with a 1-µF capacitor. Place the bypass capacitors as close to the power-supply pins of the device as

possible with low-impedance connections. Using multi-layer ceramic chip capacitors (MLCCs) that offer low

equivalent series resistance (ESR) and inductance (ESL) characteristics are recommended for power-supply

decoupling purposes. For very sensitive systems, or for systems in harsh noise environments, avoiding the use

of vias for connecting the capacitors to the device pins can offer superior noise immunity. The use of multiple

vias in parallel lowers the overall inductance and is beneficial for connections to ground planes. The analog and

digital ground are recommended to be connected together as close to the device as possible.

www.ti.com

ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

Submit Document Feedback

103

Product Folder Links: ADS131M08

ADS131M08IPBSR Datenblatt(PDF) 103 Page - Texas Instruments

ADS131M08IPBSR Datenblatt(HTML) 103 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL