OP270GSZ-REEL2 데이터 시트보기 (PDF) - Analog Devices

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OP270GSZ-REEL2

Dual Very Low Noise Precision Operational Amplifier

Analog Devices 

OP270

For reference, typical source resistances of some signal sources are listed in Table 5.

Table 5. Typical Source Resistances

Device

Strain Gage

Magnetic Tapehead, Microphone

Magnetic Phonograph Cartridge

Linear Variable Differential Transformer

Source Impedance

<500 Ω

<1500 Ω

<1500 Ω

<1500 Ω

Comments

Typically used in low frequency applications.

Low IB is very important to reduce self-magnetization problems when

direct coupling is used. OP270 IB can be disregarded.

Low IB is important to reduce self-magnetization problems in direct-coupled

applications. OP270 does not introduce any self-magnetization problems.

Used in rugged servo-feedback applications. The bandwidth of interest is

400 Hz to 5 kHz.

R3

1.24kΩ

R1

5Ω

R2

OP270

5Ω

DUT

OP27E

R5

909Ω

C1

2µF

R6

600Ω

D1, D2

1N4148

OP27E

R4

200Ω

R9

306Ω

R8

10kΩ

C2

0.032µF

C4

0.22µF

R10

65.4kΩ

R11

65.4kΩ

C3

0.22µF

R12

10kΩ

OP42E

R13

5.9kΩ

R14

4.99kΩ

C5

1µF

eOUT

GAIN = 50,000

VS = ±15V

Figure 35. Peak-to-Peak Voltage Noise Test Circuit (0.1 Hz to 10 Hz)

Rev. E | Page 13 of 20

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