ADA4522-1ARZ-R7 datasheet(31/33 Pages) AD

tên linh kiện	ADA4522-1ARZ-R7

Giải thích chi tiết về linh kiện	55 V, EMI Enhanced, Zero Drift, Ultralow Noise, Rail-to-Rail Output Operational

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31 / 33 page

Data Sheet

ADA4522-1/ADA4522-2/ADA4522-4

APPLICATIONS INFORMATION

analog.com

Rev. G | 31 of 33

total noise to 7.2 nV/√Hz. For this noise reason, it is recommended

to avoid using large source resistance.

Unity Gain Follower with Large Source

Resistance

When the ADA4522-1/ADA4522-2/ADA4522-4 are configured in a

unity-gain follower configuration with a large source resistance and

slow power supply ramp rate, the amplifier output may rail to the

positive supply.

Figure 89. Insert RF When Large RS is Used

Workaround

To avoid the amplifier output railing to the positive supply, imple-

ment one of the following actions (see Table 11 and Figure 89):

►

Reduce the value of the source resistance (RS).

►

Insert a feedback resistor (RF).

Table 11. Amplifier Output Railing Workaround Recommendations

Condition

Recommendation

1.5 V ≤ VSY − VIN < 2.5 V

RF = 200 Ω or RF ≥ 50 RS, whichever is greater

2.5 V ≤ VSY − VIN < 3.5 V

RS ≤ 200 Ω or RF ≥ 2 RS

VSY − VIN ≥ 3.5 V

RS ≤ 500 Ω or RF ≥ 0.5 RS

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