HCPL-257K-200 View Datasheet(PDF) - HP => Agilent Technologies

Part Name

Description

Manufacturer

HCPL-257K-200

Hermetically Sealed, Transistor Output Optocouplers for Analog and Digital Applications

HP => Agilent Technologies 

–

U1

+

+

VIN

IF1

1

2

IF2

3

–

–

U2

4

+

U1 , U2 , U3 , U4 , LM307

R1

2.7 kΩ

R2

2.7 kΩ

I C1 = K 1 I F1 n1

6 mA

I CC

´IF 1

I C2 = K 2 I F2 n2

´IF 2

-15 V

HCPL-5530

2

R3

OFFSET ADJUST

5 kΩ

8

220 Ω

I C1

–

7

U3

+

2

6

I C2

R4 1 kΩ

5

5 kΩ GAIN ADJUST

-15 V

–

U4

+

2

R5

50 kΩ

Figure 13. Isolation Amplifier Application Circuit.

VOUT

Description

The schematic uses a dual-

channel, high-speed optocoupler

(HCPL-5530) to function as a

servo type dc isolation amplifier.

This circuit operates on the

principle that two optocouplers

will track each other if their gain

changes by the same amount over

a specific operating region.

Performance of Circuit

• 1% linearity for 10 V peak-to-

peak dynamic range

• Gain drift: -0.03%/°C

• Offset Drift: ± 1 mV/°C

• 25 kHz bandwidth (limited by

Op-Amps U1, U2)

MIL-PRF-38534 Class H,

Class K, and DESC SMD

Test Program

Hewlett-Packard’s Hi-Rel Opto-

couplers are in compliance with

MIL-PRF-38534 Classes H and K.

Class H devices are also in

compliance with DESC drawings

5962-87679, and 5962-90854.

Testing consists of 100% screen-

ing and quality conformance

inspection to MIL-PRF-38534.

1-570

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