ADA4666-2 datasheet(24/32 Pages) AD

Part #	ADA4666-2

Description	18 V, 725 A, 4 MHz CMOS RRIO Operational Amplifier

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ADA4666-2

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 ADA4666-2 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

ADA4666-2.

Figure 75 and Figure 76 show the ADA4666-2 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 ADA4666-2 does not

power up completely. For more information about configuring

using op amps as comparators, see the AN-849 Application

Note, Using Op Amps as Comparators.

Figure 77. Supply Current vs. Supply Voltage (ADA4666-2 as a Comparator)

ADA4666-2

1/2

A1

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

ISY+

+VSY

VOUT

–VSY

ISY–

A2

ADA4666-2

1/2

A1

100kΩ

ISY+

+VSY

VOUT

–VSY

ISY–

A2

ADA4666-2

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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ADA4666-2 Datasheet(PDF) 24 Page - Analog Devices

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