ADA4638-1ACPZ-R7 datasheet(20/25 Pages) AD

20 / 25 page

Data Sheet

ADA4638-1

Rev. 0 | Page 19 of 24

ADA4638-1

ITOTAL+

ISY+

RIN1

+VSY

VOUT

–VSY

IINPUT+

RIN2

IINPUT–

ISY–

ITOTAL–

Figure 62. Comparator B

Figure 63 and Figure 64 show the total supply current of the

system, ITOTAL, and the actual currents, ISY, that flow into and

out of the supply pins of the ADA4638-1. With RIN1 = RIN2 =

100 kΩ and supply voltage of 30 V, the total supply current of

the system is 800 μA to 900 μA.

With smaller input series resistors, total supply current of the

system increases much more. Figure 65 and Figure 66 show the

supply currents with RIN1 = RIN2 = 0 Ω. The total current of the

system increases to 10 mA.

ITOTAL = ISY + IINPUT

Note that, at 30 V of supply voltage, 8 mA to 9 mA of current

flows through the input pins. This is undesirable. The ADA4638-1

is not recommended to be used as a comparator. If absolutely

necessary, place resistors in series with the inputs of the ampli-

fier to limit input current to less than 10 mA.

For more details on op amps as comparators, refer to the

AN-849 Application Note, Using Op Amps as Comparators.

–1.0

–0.8

–0.6

–0.4

–0.2

0.2

0.4

0.6

0.8

1.0

VSY (V)

ISY+

ITOTAL–

ITOTAL+

ISY–

Figure 63. Supply Current vs. Supply Voltage

(Comparator A, RIN1 = RIN2 = 100 kΩ)

–1.0

–0.8

–0.6

–0.4

–0.2

0.2

0.4

0.6

0.8

1.0

VSY (V)

ISY+

ITOTAL–

ITOTAL+

ISY–

Figure 64. Supply Current vs. Supply Voltage

(Comparator B, RIN1 = RIN2 = 100 kΩ)

–12

–10

–8

–6

–4

–2

VSY (V)

ISY+

ITOTAL–

ITOTAL+

ISY–

Figure 65. Supply Current vs. Supply Voltage

(Comparator A, RIN1 = RIN2 = 0 kΩ)

–12

–10

–8

–6

–4

–2

VSY (V)

ISY+

ITOTAL–

ITOTAL+

ISY–

Figure 66. Supply Current vs. Supply Voltage

(Comparator B, RIN1 = RIN2 = 0 kΩ)

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