Frequency (Hz)

0.01%

0.1%

1%

10%

1

10

100

1k

10k

100k

1M

D006

90% FS Input

10

INA253

SLOS954 – MAY 2018

www.ti.com

Product Folder Links: INA253

Submit Documentation Feedback

Copyright © 2018, Texas Instruments Incorporated

Feature Description (continued)

shows the performance profile of the device over frequency. Harmonic distortion increases at the upper end of

the amplifier bandwidth with no adverse change in detection of overcurrent events. However, increased distortion

at the highest frequencies must be considered when the measured current bandwidth begins to approach the

INA253 bandwidth.

For applications requiring distortion sensitive signals, Figure 4 provides information to show that there is an

optimal frequency performance range for the amplifier. The full amplifier bandwidth is always available for fast

overcurrent events at the same time that the lower frequency signals are amplified at a low distortion level. The

output signal accuracy is reduced for frequencies closer to the maximum bandwidth. Individual requirements

determine the acceptable limits of distortion for high-frequency, current-sensing applications. Testing and

evaluation in the end application or circuit is required to determine the acceptance criteria and to validate the

performance levels meet the system specifications.

Figure 4. Performance Over Frequency

8.4 Device Functional Modes

8.4.1 Adjusting the Output Midpoint With the Reference Pins

shows a test circuit for reference-divider accuracy. The INA253 output is configurable to allow for unidirectional

or bidirectional operation.

NOTE

Do not connect the REF1 pin or the REF2 pin to any voltage source lower than GND or

The output voltage is set by applying a voltage or voltages to the reference voltage inputs, REF1 and REF2. The

reference inputs are connected to an internal gain network. There is no operational difference between the two

reference pins.