OPA317-Q1_16 Datasheet, PDF (19/31 Pages) Texas Instruments – Zero-Drift, Low-Offset, Rail-to-Rail I/O Operational Amplifier

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OPA317-Q1, OPA2317-Q1, OPA4317-Q1
SLOS914 – JULY 2016
9.3 System Example
R_N are operational resistors used to isolate the ADS1100 from the noise of the digital I²C bus. The ADS1100
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.
Load
V
I_LOAD
R_SHUNT
1W
R₁
4.99 kW
R₃
4.99 kW
+5 V
R₂
49.9 kW
Device
R₄
48.7 kW
3V
REF3130
R₆
71.5 kW
R_N
56 W
ADS1100
R_N
I²C
56 W
Stray Ground-Loop Resistance
R₇
1.18 kW
(PGA Gain = 4)
FS = 3.0 V
Copyright © 2016, Texas Instruments Incorporated
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: V_S = 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.
Copyright © 2016, Texas Instruments Incorporated
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Product Folder Links: OPA317-Q1 OPA2317-Q1 OPA4317-Q1