AD8005AR Analog Devices Inc, AD8005AR Datasheet - Page 11
AD8005AR
Manufacturer Part Number
AD8005AR
Description
IC OPAMP CF ULP LDIST 10MA 8SOIC
Manufacturer
Analog Devices Inc
Datasheet
1.AD8005ARTZ-REEL7.pdf
(12 pages)
Specifications of AD8005AR
Rohs Status
RoHS non-compliant
Amplifier Type
Current Feedback
Number Of Circuits
1
Slew Rate
1500 V/µs
-3db Bandwidth
270MHz
Current - Input Bias
5µA
Voltage - Input Offset
5000µV
Current - Supply
400µA
Current - Output / Channel
10mA
Voltage - Supply, Single/dual (±)
4 V ~ 12 V, ±2 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Output Type
-
Gain Bandwidth Product
-
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Increasing Feedback Resistors
Unlike conventional voltage feedback op amps, the choice of feed-
back resistor has a direct impact on the closed-loop bandwidth
and stability of a current feedback op amp circuit. Reducing the
resistance below the recommended value makes the amplifier
more unstable. Increasing the size of the feedback resistor
reduces the closed-loop bandwidth.
Figure 33. Saving Power by Increasing Feedback Resistor
Network
REV. A
0.2V (rms)
V
IN
562
360 A (rms)
AD8005
–5V
+5V
4.99k
QUIESCENT CURRENT
475 A (MAX)
V
2V (rms)
OUT
–11–
In power-critical applications where some bandwidth can be
sacrificed, increasing the size of the feedback resistor will yield
significant power savings. A good example of this is the gain of
+10 case. Operating from a bipolar supply ( 5 V), the quiescent
current is 475 A (excluding the feedback network). The recom-
mended feedback and gain resistors are 499
respectively. In order to drive an rms output voltage of 2 V, the
output must deliver a current of 3.6 mA to the feedback net-
work. Increasing the size of the resistor network by a factor of
10 as shown in Figure 33 will reduce this current to 360 A.
The closed loop bandwidth will however decrease to 20 MHz.
AD8005
and 56.2