AD8005AR Analog Devices Inc, AD8005AR Datasheet - Page 11

• Manufacturer Part Number: AD8005AR
• Description: IC OPAMP CF ULP LDIST 10MA 8SOIC
• Manufacturer: Analog Devices Inc

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: -

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