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UTC571

LINEAR INTEGRATED CIRCUIT / COMPANDER

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UTC571

LINEAR INTEGRATED CIRCUIT

R1

G

20K

R1

10K

RD

C

CIN R3

VIN

20K

R4

VREF

30K

CREC

T

RDC

Figure 4. Basic Components

CF

VOUT

Figure 4 shows the hook-up for a compressor. This is essentially an expandor placed in the feedback loop of the

op amp . the ∆G cell is setup to provide AC feedback only, so a separate DC feedback loop is provide by the two

RDC and CDC. The values of RDC will determine the DC bias at the output of the amp. The output will bias to:

RDC1 + RDC2

VOUT DC = 1 +

R4

RDCTOT

VREF = (1 +

)1.8V

30K

The output of the expander will bias up to:

R3

VOUT DC = 1 + VREF

R4

20K

VREF = (1 +

)1.8V = 3.0V

30K

The output will bias to 3.0V when the internal resistor are used. External resistor may be placed in series with r3,

(which will affect the gain ), or in parallel with r4 to raise the DC bias to any desired value.

YOUW ANG ELECTRONICS CO.LTD

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