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AD8672ARZ 데이터시트(PDF) 11 Page - Analog Devices

부품명 AD8672ARZ
상세설명  Precision, Very Low Noise, Low Input Bias Current Operational Amplifiers
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AD8671/AD8672/AD8674
Rev. C | Page 11 of 16
APPLICATIONS
UNITY-GAIN FOLLOWER APPLICATIONS
When large transient pulses (>1 V) are applied at the positive
terminal of amplifiers (such as the OP27, LT1007, OPA227, and
AD8671) with back-to-back diodes at the input stage, the use of
a resistor in the feedback loop is recommended to avoid having
the amplifier load the signal generator. The feedback resistor,
RF, should be at least 500 Ω. However, if large values must be
used for RF, a small capacitor, CF, should be inserted in parallel
with RF to compensate for the pole introduced by the input
capacitance and RF.
Figure 32 shows the uncompensated output response with a
10 kΩ resistor in the feedback and the compensated response
with CF = 15 pF.
REF1 +OVER
23.23%
CH2 +OVER
7.885%
OUTPUT UNCOMPENSATED
OUTPUT
COMPENSATED
TIME (100ns/DIV)
Figure 32. Transient Output Response
OUTPUT PHASE REVERSAL
Phase reversal is a change of polarity in the amplifier transfer
function that occurs when the input voltage exceeds the supply
voltage. The AD8671/AD8672/AD8674 do not exhibit phase
reversal even when the input voltage is 1 V beyond the supplies.
VSY = ±15V
VIN
VOUT
TIME (10
μs/DIV)
Figure 33. Output Phase Reversal
TOTAL NOISE VS. SOURCE RESISTANCE
The low input voltage noise of the AD8671/AD8672/AD8674
makes them a great choice for applications with low source
resistance. However, because they have low input current noise,
they can also be used in circuits with substantial source
resistance.
Figure 34 shows the voltage noise, current noise, thermal noise,
and total rms noise of the AD8671 as a function of the source
resistance.
For RS < 475 Ω, the input voltage noise, en, dominates.
For 475 Ω < RS < 412 kΩ, thermal noise dominates.
For RS > 412 kΩ, the input current noise dominates.
10
1k
1
10
100
1000
100
10k
100k
1M
en_t
C
A
B
en
in
(4kRST)1/2
SOURCE RESISTANCE (
Ω)
Figure 34. Noise vs. Source Resistance


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