AD8005ART-EBZ Analog Devices Inc, AD8005ART-EBZ Datasheet - Page 11

• Manufacturer Part Number: AD8005ART-EBZ
• Description: AD8005ART-EBZ_A00674_EB-O5/6RT-1Z
• Manufacturer: Analog Devices Inc

Specifications of AD8005ART-EBZ

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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