AD8065ARZ Analog Devices Inc, AD8065ARZ Datasheet - Page 20

• Manufacturer Part Number: AD8065ARZ
• Description: IC OPAMP VF R-R LN LP 30MA 8SOIC
• Manufacturer: Analog Devices Inc
• Series: FastFET™r
• Type: Voltage Feedback Amplifierr

Specifications of AD8065ARZ

• Slew Rate: 180 V/µs
• Design Resources: Unipolar, Precision DC Digital-to-Analog Conversion Using AD5426/32/43 8-Bit to12-Bit DACs (CN0034) Programmable Gain Element Using AD5426/32/43 Current Output DACs (CN0038) Programmable Gain Element Using AD5450/1/2/3 Current Output DAC Family (CN0055)
• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• -3db Bandwidth: 145MHz
• Current - Input Bias: 3pA
• Voltage - Input Offset: 400µV
• Current - Supply: 6.6mA
• Current - Output / Channel: 30mA
• Voltage - Supply, Single/dual (±): 5 V ~ 24 V, ±2.5 V ~ 12 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: Voltage Feedback
• No. Of Amplifiers: 1
• Bandwidth: 145MHz
• Supply Voltage Range: 5V To 24V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Rail/rail I/o Type: Rail to Rail Output
• Number Of Elements: 1
• Unity Gain Bandwidth Product: 155MHz
• Common Mode Rejection Ratio: 74dB
• Input Offset Voltage: 1.5mV
• Input Bias Current: 5pA
• Single Supply Voltage (typ): 9/12/15/18V
• Dual Supply Voltage (typ): ±3/±5/±9V
• Voltage Gain In Db: 113dB
• Power Supply Rejection Ratio: 78dB
• Power Supply Requirement: Single/Dual
• Shut Down Feature: No
• Single Supply Voltage (min): 5V
• Single Supply Voltage (max): 24V
• Dual Supply Voltage (min): ±2.5V
• Dual Supply Voltage (max): ±12V
• Technology: BiFET
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Gain Bandwidth Product: -
• Lead Free Status / Rohs Status: Compliant

AD8065/AD8066
THEORY OF OPERATION
The AD8065/AD8066 are voltage feedback operational amplifiers
that combine a laser-trimmed JFET input stage with the Analog
Devices eXtra Fast Complementary Bipolar (XFCB) process,
resulting in an outstanding combination of precision and speed.
The supply voltage range is from 5 V to 24 V. The amplifiers feature
a patented rail-to-rail output stage capable of driving within 0.5 V
of either power supply while sourcing or sinking up to 30 mA.
Also featured is a single-supply input stage that handles common-
mode signals from below the negative supply to within 3 V of the
positive rail. Operation beyond the JFET input range is possible
because of an auxiliary bipolar input stage that functions with
input voltages up to the positive supply. The amplifiers operate as
if they have a rail-to-rail input and exhibit no phase reversal
behavior for common-mode voltages within the power supply.
With voltage noise of 7 nV/√Hz and −88 dBc distortion for
1 MHz, 2 V p-p signals, the AD8065/AD8066 are a great choice
for high resolution data acquisition systems. Their low noise,
sub-pA input current, precision offset, and high speed make
them superb preamps for fast photodiode applications. The
speed and output drive capability of the AD8065/AD8066 also
make them useful in video applications.
CLOSED-LOOP FREQUENCY RESPONSE
The AD8065/AD8066 are classic voltage feedback amplifiers
with an open-loop frequency response that can be approximated as
the integrator response shown in Figure 53. Basic closed-loop
frequency response for inverting and noninverting configurations
can be derived from the schematics shown.
80
60
40
20
0
R
V
G
I
0.01
Figure 53. Open-Loop Gain vs. Frequency and Basic Connections
V
E
R
F
A
0.1
FREQUENCY (MHz)
A = (2π ×
V
O
Rev. J | Page 20 of 28
f
1
crossover
)/s
NONINVERTING CLOSED-LOOP FREQUENCY
RESPONSE
Solving for the transfer function
where f
gain equals 0 db
At dc
Closed-loop −3 dB frequency
INVERTING CLOSED-LOOP FREQUENCY
RESPONSE
At dc
Closed-loop −3 dB frequency
10
V
I
V
V
V
V
f
f
V
V
−
V
V
−3
O
O
I
I
crossover
3dB
O
O
I
I
dB
=
=
=
=
=
(
s
=
R
R
−
R
(
G
f
R
is the frequency where the amplifier’s open-loop
F
crossover
100
F
f
R
R
F
R
crossover
2
+
G
+
F
V
π
G
+
R
−
E
R
f
crossover
×
R
2
G
G
R
π
G
)
F
×
f
s
crossover
)
×
A
+
+
R
×
f
F
2
2
crossover
R
= 65MHz
R
π
π
+
F
G
×
×
R
R
(
+
R
G
G
f
f
G
crossover
crossover
R
×
V
+
G
O
R
R
F
F
×
×
)
R
R
G
G