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參數(shù)資料
| 型號(hào)： | AD8620AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 850 uV OFFSET-MAX, 25 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 414K |
| 代理商： | AD8620AR |
REV. D
–12–
AD8610/AD8620
diodes greatly interfere with many application circuits such as
precision rectifiers and comparators. The AD8610 is free from
these limitations.
V1
–13V
3
2
7
4
+13V
14V
0
6
AD8610
Figure 16. Unity Gain Follower
No Phase Reversal
Many amplifiers misbehave when one or both of the inputs are
forced beyond the input common-mode voltage range. Phase
reversal is typified by the transfer function of the amplifier,
effectively reversing its transfer polarity. In some cases, this can
cause lockup and even equipment damage in servo systems, and
may cause permanent damage or nonrecoverable parameter
shifts to the amplifier itself. Many amplifiers feature compensation
circuitry to combat these effects, but some are only effective for
the inverting input. The AD8610/AD8620 is designed to prevent
phase reversal when one or both inputs are forced beyond their
input common-mode voltage range.
TIME – 400 s/DIV
0
V
V
IN
V
OUT
Figure 17. No Phase Reversal
THD Readings vs. Common-Mode Voltage
Total harmonic distortion of the AD8610/AD8620 is well below
0.0006% with any load down to 600
. The AD8610/AD8620
outperforms the OPA627 for distortion, especially at frequen-
cies above 20 kHz.
FREQUENCY – Hz
0.01
0.0001
10
80k
T
0.001
0.1
100
1k
10k
OPA627
AD8610
V
SY
= 13V
V
= 5V rms
BW = 80kHz
Figure 18. AD8610 vs. OPA627 THD + Noise @ V
CM
= 0 V
TIME – 400ns/DIV
V
V
S
= 13V
R
= 2k
G = +1
SR = 23V/ s
Figure 14. (+SR) of OPA627 in Unity Gain of +1
The slew rate of an amplifier determines the maximum frequency
at which it can respond to a large signal input. This frequency
(known as full-power bandwidth, or FPBW) can be calculated
from the equation:
FPBW
SR
V
PEAK
×
=
(
)
2
π
for a given distortion (e.g., 1%).
V
0V
CH
2
= 19.4V
p-p
0V
CH
1
= 20.8V
p-p
TIME – 400ns/DIV
Figure 15. AD8610 FPBW
Input Overvoltage Protection
When the input of an amplifier is driven below V
EE
or above V
CC
by more than one V
BE
, large currents will flow from the substrate
through the negative supply (V–) or the positive supply
(V+),
respectively, to the input pins, which can destroy the device.
If the
input source can deliver larger currents than the maximum forward
current of the diode (>5 mA), a series resistor can be
added to
protect the inputs. With its very low input bias and offset current, a
large series resistor can be placed in front of the AD8610
inputs to
limit current to below damaging levels. Series resistance
of 10 k
will generate less than 25
μ
V of offset. This 10 k
will allow
input
voltages more than 5 V beyond either power supply. Thermal noise
generated by the resistor will add 7.5 nV/
√
Hz
to the noise of the
AD8610. For the AD8610/AD8620, differential voltages equal to
the supply voltage will not cause any problem (see Figure 15).
In this context, it should also be noted that the high breakdown
voltage of the input FETs eliminates the need to
include clamp
diodes between the inputs of the amplifier, a practice
that is
mandatory on many precision op amps. Unfortunately, clamp
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