OP471F 데이터 시트보기 (PDF) - Analog Devices

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OP471F

High Speed, Low Noise Quad Operational Amplifier

Analog Devices 

OP471

1000

OP11

OP400

OP471

100

OP470

RESISTOR

NOISE ONLY

10

100

1k

10k

RS – SOURCE RESISTANCE – ⍀

100k

Figure 6. Peak-to-Peak Noise (0.1 Hz to 10 Hz) vs. Source

Resistance (Includes Resistor Noise)

Figure 6 shows peak-to-peak noise versus source resistance over

the 0.1 Hz to 10 Hz range. Once again, at low values of RS, the

voltage noise of the OP471 is the major contributor to peak-to-peak

noise. Current noise becomes the major contributor as RS increases.

The crossover point between the OP471 and the OP400 for

peak-to-peak noise is at RS = 17 W.

The OP470 is a lower noise version of the OP471, with a typical

noise voltage density of 3.2 nV/÷Hz @ 1 kHz. The OP470 offers

lower offset voltage and higher gain than the OP471, but is a slower

speed device, with a slew rate of 2 V/ms compared to a slew rate

of 8 V/ms for the OP471.

For reference, typical source resistances of some signal sources

are listed in Table I.

Device

TABLE I.

Source

Impedance Comments

Strain gauge < 500 W

Typically used in

low-frequency applications.

Magnetic

tapehead

< 1,500 W

Magnetic

phonograph

cartridges

< 1,500 W

Low IB very important to reduce

self-magnetization problems

when direct coupling is used.

OP471 IB can be neglected.

Similar need for low IB in direct

coupled applications. OP471

will not introduce any

self -magnetization problem.

Linear variable < 1,500 W

differential

transformer

Used in rugged servo-feedback

applications. Bandwidth of

interest is 400 Hz to 5 kHz.

*For further information regarding noise calculations, see “Minimization of

Noise in Op Amp Applications,” Application Note AN-15.

R3

1.24k⍀

R1

5⍀

R2

5⍀

OP471

DUT

C1

2␮F

OP27E

C4

R5

909⍀

R6

600k⍀

0.22␮F

R10

R11

R4

200⍀

D1

1N4148

D2

1N4148

OP15E

R9

65.4k⍀

65.4k⍀

C3

0.22␮F

OP15E

R14

4.99k⍀

eOUT

306k⍀

C5

R13

1␮F

5.9k⍀

R8

10k⍀

C2

0.032␮F

R12

10k⍀

GAIN = 50,000

VS = ؎15V

Figure 7. Peak-to-Peak Voltage Noise Test Circuit (0.1 Hz to 10 Hz)

–8–

REV. A

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