OP271 データシートの表示（PDF） - Analog Devices

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OP271

High-Speed, Dual Operational Amplifier

Analog Devices 

0

–1

–2 SINGLE OP AMP,

CONVENTIONAL

–3

DESIGN

–4

CASCADED

(TWO STAGES)

–5 LOW PHASE ERROR

AMPLIFIER

–6

–7

0.001

0.01

0.005

0.1

0.005

FREQUENCY RATIO – 1/␤ ␻/␻

1.0

0.5

Figure 5. Phase Error Comparison

Figure 5 compares the phase error performance of the low

phase error amplifier with a conventional single op amp

amplifier and a cascaded two-stage amplifier. The low phase

error amplifier shows a much lower phase error, particularly for

frequencies where ␻ր〉␻T<0.1. For example, phase error of

-0.1؇ occurs at 0.002 ␻ր〉␻T for the single op amplifier, but

at 0.11 ␻ր〉␻T for the low phase error amplifier.

For more detailed information on the low phase error amplifier,

see Application Note AN-107.

OP271

Dual 12-Bit Voltage Output DAC

The dual voltage output DAC shown in Figure 6 will settle to

12-bit accuracy from zero to full scale in 2 ␮s typically. The

CMOS DAC-8222 utilizes a 12-bit, double-buffered input

structure allowing faster digital throughput and minimizing

digital feedback.

Fast Current Pump

Maximum output current of the fast current pump shown in

Figure 7 is ؎11 mA. Voltage compliance exceeds ؎10 V with

؎15 V supplies. The current pump has an output resistance

of over 3 M⍀ and maintains 12-bit linearity over its entire

output range.

R3

10k⍀

R1

10k⍀

VIN

R2

10k⍀

2

1/2

OP271FZ

3

R5

1

100⍀

+15V

R4

10k⍀

8

5

7

1/2

OP271FZ

6

4

IOUT

؎11mA

IOUT =

VIN

RS

= VIN =10mA/V

100⍀

–15V

Figure 7. Fast Current Pump

REV. A

+15V

10␮F

10V

REFERENCE

VOLTAGE

5V

21

VDD

DAC-8222EW

RFBA

3

4 VREFA

DAC A

IOUTA 2

10pF

2

3

12-BIT DATABUS PINS 6–17

AGND 1

0.1␮F

8

–

1/2

OP271EZ

+

4

0.1␮F

VOUTA

–15V

10␮F

22 VREFB

DAC B

IOUTB 24

6–

10pF

1/2

7

OP271EZ

18 DAC A/DAC B

RFBB

23

5+

DAC

CONTROL

19 LDAC

20 WR

DGND

VOUTB

Figure 6. Dual 12-Bit Voltage Output DAC

–9–

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