OP270GSZ2 datasheet(13/20 Pages) AD

13 / 20 page

OP270

Rev. E | Page 13 of 20

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

Table 5. Typical Source Resistances

Device

Source Impedance

Comments

Strain Gage

<500 Ω

Typically used in low frequency applications.

Magnetic Tapehead, Microphone

<1500 Ω

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

direct coupling is used. OP270 IB can be disregarded.

Magnetic Phonograph Cartridge

<1500 Ω

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

applications. OP270 does not introduce any self-magnetization problem

Linear Variable Differential Transformer

<1500 Ω

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

400 Hz to 5 kHz.

OP270

DUT

5Ω

1.24kΩ

OP27E

909Ω

200Ω

R13

5.9kΩ

R12

10kΩ

OP27E

OP42E

306Ω

R10

65.4kΩ

R11

65.4kΩ

10kΩ

2µF

0.22µF

D1, D2

1N4148

600Ω

0.032µF

0.22µF

1µF

R14

4.99kΩ

eOUT

GAIN = 50,000

VS = ±15V

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

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