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ADA4661-2ARMZ-R7 数据表(PDF) 24 Page - Analog Devices

部件名 ADA4661-2ARMZ-R7
功能描述  18 V, Precision, 725 A, 4 MHz, CMOS RRIO Operational Amplifier
PDF  32 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADA4661-2ARMZ-R7 数据表(HTML) 24 Page - Analog Devices

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ADA4661-2
Data Sheet
Rev. 0 | Page 24 of 32
COMPARATOR OPERATION
An op amp is designed to operate in a closed-loop configuration
with feedback from its output to its inverting input. Figure 73
shows the ADA4661-2 configured as a voltage follower with an
input voltage that is always kept at the midpoint of the power
supplies. The same configuration is applied to the unused
channel. A1 and A2 indicate the placement of ammeters to
measure supply current. ISY+ refers to the current flowing from
the upper supply rail to the op amp, and ISY− refers to the
current flowing from the op amp to the lower supply rail. As
shown in Figure 74, in normal operating conditions, the total
current flowing into the op amp is equivalent to the total current
flowing out of the op amp, where ISY+ = ISY− = 630 μA per amplifier
at VSY = 18 V.
Figure 73. Voltage Follower
Figure 74. Supply Current vs. Supply Voltage (Voltage Follower)
In contrast to op amps, comparators are designed to work in an
open-loop configuration and to drive logic circuits. Although
op amps are different from comparators, occasionally an unused
section of a dual op amp is used as a comparator to save board
space and cost; however, this is not recommended for the
ADA4661-2.
Figure 75 and Figure 76 show the ADA4661-2 configured as a
comparator, with 100 kΩ resistors in series with the input pins.
Any unused channels are configured as buffers with the input
voltage kept at the midpoint of the power supplies.
Figure 75. Comparator A
Figure 76. Comparator B
Figure 77 shows the supply currents for both comparator
configurations. In comparator mode, the ADA4661-2 does not
power up completely. For more information about configuring
using on op amps as comparators, see the AN-849 Application
Note, Using Op Amps as Comparators.
Figure 77. Supply Current vs. Supply Voltage (ADA4661-2 as a Comparator)
ADA4661-2
1/2
A1
100kΩ
100kΩ
ISY+
+VSY
VOUT
–VSY
ISY–
A2
0
100
200
300
400
500
600
700
0
2
4
6
8
10
12
14
16
18
VSY (V)
A1
100kΩ
100kΩ
ISY+
+VSY
VOUT
–VSY
ISY–
A2
ADA4661-2
1/2
A1
100kΩ
100kΩ
ISY+
+VSY
VOUT
–VSY
ISY–
A2
ADA4661-2
1/2
0
100
200
300
400
500
600
700
0
2
4
6
8
10
12
14
16
18
VSY (V)
COMPARATOR A
COMPARATOR B



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