IL300 datasheet(8/8 Pages) SIEMENS

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IL300

These ampliﬁers provide either an inverting or non-inverting

transfer gain based upon the type of input and output ampliﬁer.

Table 2 shows the various conﬁgurations along with the spe-

ciﬁc transfer gain equations. The offset column refers to the

calculation of the output offset or Vref2 necessary to provide a

zero voltage output for a zero voltage input. The non-inverting

input ampliﬁer requires the use of a bipolar supply, while the

inverting input stage can be implemented with single supply

operational ampliﬁers that permit operation close to ground.

For best results, place a buffer transistor between the LED and

output of the operational ampliﬁer when a CMOS opamp is

used or the LED IFq drive is targeted to operate beyond 15 mA.

Finally the bandwidth is inﬂuenced by the magnitude of the

closed loop gain of the input and output ampliﬁers. Best band-

widths result when the ampliﬁer gain is designed for unity.

Figure 22. Non-inverting and inverting ampliﬁers

Table 2. Optolinear ampliﬁers

Amp[iﬁer

Input

Output

Gain

Offset

Non-Inverting

Inverting

Non-Inverting

Inverting

Non-Inverting

Inverting

Vcc

20pF

+Vref2

–Vref1

Vin

+Vcc

100

Ω

IL 300

–Vcc

Vcc

–Vcc

Vcc

20pF

+Vref2

Vout

+Vref1

Vin

+Vcc

100

Ω

Vcc

–Vcc

Vcc

–

Non-Inverting Input

Non-Inverting Output

Inverting Input

Inverting Output

IL 300

–

–Vcc

VOUT K3 R4 R2

VIN

R3 (R1+R2)

Vref1 R4 K3

Vref2=

VOUT K3 R4 R2 (R5+R6)

VIN

R3 R5 (R1 +R2)

–Vref1 R4 (R5+R6) K3

R3 R6

Vref2=

VOUT –K3 R4 R2 (R5+R6)

VIN

R3 R5 (R1 +R2)

Vref1 R4 (R5+R6) K3

R3 R6

Vref2=

VOUT –K3 R4 R2

VIN

R3 (R1 +R2)

–Vref1 R4 K3

Vref2=

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