AD744KR-REEL7 datasheet(9/12 Pages) AD

部品番号	AD744KR-REEL7

部品情報	Precision, 500 ns Settling BiFET Op Amp

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REV. C

AD744

–9–

Table II. Recommended Values of CCOMP vs. Various Load Conditions for the Circuits of

Figures 31 and 32.

Max

Slew

–3 dB

R1

R2

Gain

CLOAD

CCOMP

CLEAD

Rate

Bandwidth

( )( )

Follower

Inverter

(pF)

(V/ s)

(MHz)

4.99 k

2

1

50

0

7

75

2.5

1

4.99 k

2

1

150

5

7

37

2.31

4.99 k

2

1

1000

20

–

14

1.2

4.99 k

2

1

>2000

25

–

12.5

2

1.0

499

Ω

4.99 k

11

10

270

0

–

75

1.2

499

Ω

4.99 k

11

10

390

2

–

50

0.85

499

Ω

4.99 k

11

10

1000

5

–

37

2

0.60

NOTES

1Bandwidth with C

LEAD adjusted for minimum settling time.

2Into large capacitive loads the AD744’s 25 mA output current limit sets the slew rate of the amplifier, in V/

µs, equal to 0.025

amps divided by the value of CLOAD in

µF. Slew rate is specified into rated max C

LOAD except for cases marked

2, which are

specified with a 50 pF. load.

AD744

1 F

0.1 F

–VS

CCOMP

1 F

0.1 F

+VS

VOUT

VIN

OPTIONAL

R2*

CLEAD*

R1*

*SEE TABLE II

Figure 32. AD744 Connected as an Inverting Amplifier

Operating at Gains of 1 or Greater

Using Decompensation to Extend the Gain Bandwidth

Product

When the AD744 is used in applications where the closed-loop

gain is greater than 10, gain bandwidth product may be enhanced

by connecting a small capacitor between Pins 1 and 5 (Figure

33). At low frequencies, this capacitor cancels the effects of the

chip’s internal compensation capacitor, CCOMP, effectively dec-

ompensating the amplifier.

Due to manufacturing variations in the value of the internal

CCOMP, it is recommended that the amplifier’s response be

optimized for the desired gain by using a 2 to 10 pF trimmer

capacitor rather than using a fixed value.

\

AD744

1 F

0.1 F

–VS

1 F

0.1 F

+VS

VOUT

VIN

NOT CONNECTED

R2*

R1*

2 – 10pF

*SEE TABLE III

Figure 33. Using the Decompensation Connection to

Extend Gain Bandwidth

Table III. Performance Summary for the Circuit of Figure 33

R1

R2

Gain

–3 dB

Gain/BW

( )( )

Follower

Inverter

Bandwidth

Product

1 k

10 k

11

10

2.5 MHz

25 MHz

100

10 k

101

100

760 kHz

76 MHz

100

100 k

1001

1000

225 kHz

225 MHz

同様の部品番号 - AD744KR-REEL7

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