ADS1113 datasheet(39/50 Pages) TI

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9.2.3 Application Curves

Shunt Voltage (mV)

-60 -50 -40 -30 -20 -10

-250

-200

-150

-100

-50

100

150

200

250

D004

Figure 9-7. Measured Output vs Shunt Voltage

(VSHUNT)

Shunt Voltage (mV)

-50

-40

-30

-20

-10

-2

-1.75

-1.5

-1.25

-1

-0.75

-0.5

-0.25

0.25

0.5

0.75

1.25

1.5

1.75

D005

Including all errors

Excluding resistor errors

Excluding resistor errors, after offset calibration

Figure 9-8. Measurement Error vs Shunt Voltage

(VSHUNT)

9.3 Power Supply Recommendations

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

9.3.1 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.

9.3.2 Power-Supply Decoupling

Good power-supply decoupling is important to achieve optimum performance. VDD must be decoupled with at

least a 0.1-µF capacitor, as shown in Figure 9-9. 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,

avoid the use of vias for connecting the 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.

0.1 µF

VDD

ADDR

GND

AIN0

AIN1

DIN

SDA

VDD

AIN3

AIN2

TI Device

ALERT/RDY

Figure 9-9. ADS1115-Q1 Power-Supply Decoupling

www.ti.com

ADS1113-Q1, ADS1114-Q1, ADS1115-Q1

SBAS563E – DECEMBER 2011 – REVISED DECEMBER 2022

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Product Folder Links: ADS1113-Q1 ADS1114-Q1 ADS1115-Q1

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