Device

ADS1100

Load

V

I C

2

R

1

4.99 kW

R

3

4.99 kW

R

4

48.7 kW

R

2

49.9 kW

+5 V

3 V

REF3130

R

7

1.18 kW

R

SHUNT

1 W

R

6

71.5 kW

R

N

56 W

R

N

56 W

(PGA Gain = 4)

FS = 3.0 V

Stray Ground-Loop Resistance

I

LOAD

Copyright © 2016, Texas Instruments Incorporated

19

OPA317-Q1, OPA2317-Q1, OPA4317-Q1

www.ti.com

SLOS914 – JULY 2016

Product Folder Links: OPA317-Q1 OPA2317-Q1 OPA4317-Q1

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Copyright © 2016, Texas Instruments Incorporated

9.3 System Example

device is a 16-bit converter; therefore, a precise reference is essential for maximum accuracy. If absolute

accuracy is not required and the 5-V power supply is sufficiently stable, the REF3130 device may be omitted.

NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.

Figure 24. Low-Side Current Monitor

10 Power Supply Recommendations

The OPAx317-Q1 device is specified for operation from 1.8 V to 5.5 V (±0.9 V to ±2.75 V); many specifications

apply from –40°C to +125°C. The Electrical Characteristics: VS = 1.8 V to 5.5 V table presents parameters that

can exhibit significant variance with regard to operating voltage or temperature.

CAUTION

Supply voltages larger than 7 V can permanently damage the device (see the Absolute

Maximum Ratings) table.

Place 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or high-

impedance power supplies. For more detailed information on bypass capacitor placement, see the Layout

Guidelines section.