ADA4817-1ARDZ-R7 Analog Devices Inc, ADA4817-1ARDZ-R7 Datasheet - Page 14
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ADA4817-1ARDZ-R7
Manufacturer Part Number
ADA4817-1ARDZ-R7
Description
High Speed FET Input Amp
Manufacturer
Analog Devices Inc
Series
FastFET™r
Datasheet
1.ADA4817-1ARDZ.pdf
(28 pages)
Specifications of ADA4817-1ARDZ-R7
Amplifier Type
Voltage Feedback
Number Of Circuits
1
Slew Rate
870 V/µs
Gain Bandwidth Product
410MHz
-3db Bandwidth
1.05GHz
Current - Input Bias
2pA
Voltage - Input Offset
400µV
Current - Supply
19mA
Current - Output / Channel
40mA
Voltage - Supply, Single/dual (±)
5 V ~ 10 V, ±2.5 V ~ 5 V
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
ADA4817-1/ADA4817-2
THEORY OF OPERATION
The ADA4817-1/ADA4817-2 are voltage feedback operational
amplifiers that combine new architecture for FET input operational
amplifiers with the eXtra Fast Complementary Bipolar (XFCB)
process from Analog Devices, resulting in an outstanding
combination of speed and low noise. The innovative high speed
FET input stage handles common-mode signals from the negative
supply to within 2.7 V of the positive rail. This stage is combined
with an H-bridge to attain a 870 V/μs slew rate and low distortion,
in addition to 4 nV/√Hz input voltage noise. The amplifier
features a high speed output stage capable of driving heavy loads
sourcing and sinking up to 40 mA of linear current. Supply current
and offset current are laser trimmed for optimum performance.
These specifications make the ADA4817-1/ ADA4817-2 a great
choice for high speed instrumentation and high resolution data
acquisition systems. Its low noise, picoamp input current, precision
offset, and high speed make them superb preamps for fast photo-
diode applications.
CLOSED-LOOP FREQUENCY RESPONSE
The ADA4817-1/ADA4817-2 are classic voltage feedback
amplifiers with an open-loop frequency response that can be
approximated as the integrator response shown in Figure 43. Basic
closed-loop frequency response for inverting and noninverting
configurations can be derived from the schematics shown in
Figure 41 and Figure 42.
NONINVERTING CLOSED-LOOP FREQUENCY
RESPONSE
Solving for the transfer function,
where f
gain equals 0 dB.
At dc,
V
V
V
V
O
O
I
CROSSOVER
I
=
=
(
R
R
F
F
R
+
G
+
2
is the frequency where the amplifier’s open-loop
Figure 41. Noninverting Configuration
R
π
V
R
Figure 42. Inverting Configuration
G
IN
×
G
)
f
S
R
CROSSOVER
V
G
+
IN
R
2
G
π
×
V
E
V
f
E
R
CROSSOVER
(
F
R
R
F
A
G
A
+
R
F
)
×
R
V
G
OUT
V
OUT
Rev. A | Page 14 of 28
(4)
(5)
Closed-loop −3 dB frequency
INVERTING CLOSED-LOOP FREQUENCY RESPONSE
Solving for the transfer function,
Solve for closed-loop −3 dB frequency by,
The closed-loop bandwidth is inversely proportional to the noise
gain of the op amp circuit, (R
accurate for noise gains above 2. The actual bandwidth of circuits
with noise gains at or below 2 is higher than those predicted
with this model due to the influence of other poles in the
frequency response of the real op amp.
Figure 44 shows a voltage feedback amplifier’s dc errors. For
both inverting and noninverting configurations,
V
OUT
80
60
40
20
0
At dc
V
Figure 43. Open-Loop Gain vs. Frequency and Basic Connections
V
f
f
(
−3
−
error
O
I
3dB
dB
=
0.1
=
=
(
V
V
Figure 44. Voltage Feedback Amplifier’s DC Errors
R
)
f
V
O
f
=
I
R
F
CROSSOVER
IN
CROSSOVER
G
I
=
+
b
+
−
−
R
A = (2π ×
×
2
G
R
R
R
π
S
R
)
G
F
S
×
S
1
×
+V
+
×
f
FREQUENCY (MHz)
⎛
⎜
⎜
⎝
R
OS
CROSSOVER
2
R
R
f
π
F
CROSSOVER
–
F
R
G
×
+
R
R
G
+
+
F
G
R
G
f
R
CROSSOVER
+ R
R
G
G
F
10
I
I
×
b
G
⎞
⎟
⎟
⎠
b
)/s
+
–
)/R
−
R
R
F
F
I
G
b
−
. This simple model is
A
×
×
R
R
100
G
F
+
f
CROSSOVER
V
OS
V
OUT
⎛
⎜
⎜
⎝
1000
R
G
= 410MHz
R
+
G
R
(10)
F
(6)
(7)
(8)
(9)
⎞
⎟
⎟
⎠