ADS1015 datasheet(32/46 Pages) TI2

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10.2.3 Application Curve

The measurement results in Figure 10-10 show that the two supplies can be measured with ±0.5% accuracy

over the complete operating ambient temperature range without any offset or gain calibration.

Temperature (qC)

-40

-20

100

-0.1

-0.075

-0.05

-0.025

0.025

0.05

0.075

0.1

3.3 V rail monitor

1.8 V rail monitor

Figure 10-10. Measurement Error vs Temperature

10.3 Power Supply Recommendations

The device requires a single unipolar supply, VDD, to power both the analog and digital circuitry of the device.

10.3.1 Power-Supply Sequencing

Wait approximately 50 µs after VDD is stabilized before communicating with the device to allow the power-up

reset process to complete.

10.3.2 Power-Supply Decoupling

Good power-supply decoupling is important to achieve optimum performance. As shown in Figure 10-11, VDD

must be decoupled with at least a 0.1-µF capacitor. The 0.1-μF bypass capacitor supplies the momentary bursts

of extra current required from the supply when the device is converting. Place the bypass capacitor as close to

the power-supply pin of the device as possible using low-impedance connections. Use multilayer ceramic chip

capacitors (MLCCs) that offer low equivalent series resistance (ESR) and inductance (ESL) characteristics for

power-supply decoupling purposes. For very sensitive systems, or for systems in harsh noise environments, do

not use vias to connect capacitors to the device pins for better noise immunity. Using multiple vias in parallel

lowers the overall inductance, and is beneficial for connections to ground planes.

VDD

0.1 μF

ADDR

ALERT/RDY

GND

AIN0

AIN1

SCL

SDA

VDD

AIN3

AIN2

TI Device

Figure 10-11. ADS1115L Power-Supply Decoupling

ADS1114L, ADS1115L

SBASAV5 – DECEMBER 2023

www.ti.com

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ADS1015 Datasheet(PDF) 32 Page - Texas Instruments

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