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| 型號： | AD9621AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Wideband Voltage Feedback Amplifier |
| 中文描述： | OP-AMP, 15000 uV OFFSET-MAX, 350 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 305K |
| 代理商： | AD9621AR |
AD9621
REV. 0
–3–
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltages (
±
V
S
) . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
6 V
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . .
±
V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .6 V
Continuous Output Current
2
. . . . . . . . . . . . . . . . . . . . . 90 mA
Operating Temperature Ranges
AN, AQ, AR . . . . . . . . . . . . . . . . . . . . . . . .–40
°
C to +85
°
C
SQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–55
°
C to +125
°
C
Storage Temperature
Ceramic . . . . . . . . . . . . . . . . . . . . . . . . . . .–65
°
C to +150
°
C
Plastic . . . . . . . . . . . . . . . . . . . . . . . . . . . .–65
°
C to +125
°
C
Junction Temperature
Ceramic
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +175
°
C
Plastic
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150
°
C
Lead Soldering Temperature (1 minute)
4
. . . . . . . . . . +220
°
C
NOTES
1
Absolute maximum ratings are limiting values to be applied individually, and
beyond which the serviceability of the circuit may be impaired. Functional
operability is not necessarily implied. Exposure to absolute maximum rating
conditions for an extended period of time may affect device reliability.
2
Output is short-circuit protected; for maximum reliability, 90 mA continuous
current should not be exceeded.
3
Typical thermal impedances (part soldered onto board; no air flow):
Ceramic DIP:
θ
JA
= 100
°
C/W;
θ
JC
= 30
°
C/W
Plastic SOIC:
θ
JA
= 125
°
C/W;
θ
JC
= 45
°
C/W
Plastic DIP:
θ
= 90
°
C/W;
θ
= 45
°
C/W
4
Temperature shown is for surface mount devices, mounted by vapor phase
soldering. Throughhole devices (ceramic and plastic DIPs) can be soldered at
+300
°
C for 10 seconds.
ORDERING GUIDE
Temperature
Range
Package
Description
Package
Option
Model
AD9621AN
AD9621AQ
AD9621AR
AD9621SQ
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–55
°
C to +125
°
C
8-Pin Plastic DIP
8-Pin Cerdip
8-Pin SOIC
8-Pin Cerdip
N-8
Q-8
R-8
Q-8
EXPLANATION OF TEST LEVELS
Test Level
I
– 100% production tested.
II
– 100% production tested at +25
°
C, and sample tested at
specified temperatures. AC testing of “A” grade devices
done on sample basis.
III – Sample tested only.
IV – Parameter is guaranteed by design and characterization
testing.
V
– Parameter is a typical value only.
VI – All devices are 100% production tested at +25
°
C. 100%
production tested at temperature extremes for extended
temperature devices; sample tested at temperature ex-
tremes for commercial/industrial devices.
–VS
46.5mm
– INPUT
46.5mils
CB–
CB+
–INPUT +INPUT
+VS
OUTPUT
54mils
Chip Layout
THEORY OF OPERATION
The AD9621 is a wide bandwidth, unity gain stable voltage
feedback amplifier. Since its open-loop frequency response fol-
lows the conventional 6 dB/octave roll-off, its gain bandwidth
product is basically constant. Increasing its closed-loop gain re-
sults in a corresponding decrease in small signal bandwidth. The
AD9621 typically maintains a 55 degree unity loop gain phase
margin. This high margin minimizes the effects of signal and
noise peaking.
Feedback Resistor Choice
At minimum stable gain (+1), the AD9621 provides optimum
dynamic performance with R
F
51
. This resistor acts only as
a parasitic suppressor against damped R
F
oscillations that can
occur due to lead (input, feedback) inductance and parasitic ca-
pacitance. For settling accuracy to 0.1% or less, this resistor
should not be required if layout guidelines are closely followed.
This value for R
F
provides the best combination of wide band-
width, low parasitic peaking, and fast settling time.
When the AD9621 is used in the transimpedance (I-to-V)
mode, such as for photo-diode detection, the value for R
F
and
diode capacitance (C
I
) are usually known. See Figure 1. Gener-
ally, the value of R
F
selected will be in the k
range, and a shunt
capacitor (C
F
) across R
F
will be required to maintain good am-
plifier stability. The value of C
F
required to maintain < 1 dB of
peaking can be estimated as:
C
F
[(2
ω
ο
C
I
R
F
1)
ω
ο
2
R
F
2
]
1 2
|
R
F
≥
1
k
where
ω
o
is equal to the unity gain bandwidth product of the
amplifier in RAD/sec, and C
I
is the equivalent total input ca-
pacitance at the inverting input. Typically
ω
o
is 700
×
10
6
RAD/sec (See Open Loop Frequency Response curve).
As an example, choosing R
F
of 10 k
and C
I
of 5 pF, requires
C
F
to be 1.1 pF (Note: C
I
includes both the source and parasitic
circuit capacitance). The bandwidth of the amplifier can be esti-
mated using the C
F
calculated as:
f
3
dB
1.6
2
π
R
F
C
F
For general voltage gain applications, the amplifier bandwidth
can be estimated as:
f
3
dB
ω
ο
1
+
R
F
R
G
This estimation loses accuracy for gains approaching +2/–1 or
lower due to the amplifier’s damping factor. For these “l(fā)ow
gain” cases, the bandwidth will actually extend beyond the cal-
culated value. See Closed Loop BW plots.
As a rule of thumb, capacitor C
F
will not be required if:
R
F
R
G
(
)
C
I
≤
NG
4
ω
ο
where NG is the Noise Gain (l + R
F
/R
G
) of the circuit. For most
voltage gain applications, this should be the case.
相關PDF資料 |
PDF描述 |
|---|---|
| AD9621SQ | Wideband Voltage Feedback Amplifier |
| AD9630 | Low Distortion 750 MHz Closed-Loop Buffer Amp |
| AD9630AN | Low Distortion 750 MHz Closed-Loop Buffer Amp |
| AD9630AR | Low Distortion 750 MHz Closed-Loop Buffer Amp |
| AD9630AR-REEL | ECONOLINE: REC3-S_DRW(Z)/H4,H6 - Safety standards and approval: EN 60950 certified, rated for 250VAV (LVD test report)- Applied for Ul 1950 Component Recognised Certification- 3W DIP Package- 4kVDC & 6kVDC Isolation- Regulated Output- Continuous Short Circiut Protection Auto-Restarting |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9621SQ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Wideband Voltage Feedback Amplifier |
| AD9622 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Wideband Voltage Feedback Amplifier |
| AD9622AN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9622AQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| AD9622AR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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