AMC1301-Q1 Datasheet, PDF (23/34 Pages) Texas Instruments – Precision, 250-mV Input, Delay, Reinforced Isolated Amplifier

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AMC1301-Q1
SBAS792A – APRIL 2017 – REVISED APRIL 2017
9.2.2.3 Application Curve
Figure 53 shows the dependency of the input bias current on the common-mode voltage at the input of the
AMC1301-Q1 device.
60
40
20
0
-20
-40
-60
-80
-0.5
0
0.5
1
1.5
2
2.5
3
V_CM (V)
D012
Figure 53. Input Current vs Input Common-Mode Voltage
9.3 Do's and Don'ts
Do not leave the inputs of the AMC1301-Q1 device unconnected (floating) when the device is powered up. If
both device inputs are left floating, the input bias current drives them to the output common-mode of the analog
front-end of approximately 2 V. If the high-side supply voltage VDD1 is below 4 V, the internal common-mode
overvoltage detector turns on and the output functions as described in the Fail-Safe Output section, which may
lead to an undesired reaction on the system level.
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