AM79C30AJC datasheet(79/101 Pages) AMD

79 / 101 page

Am79C30A/32A Data Sheet

Figure 28.

Equivalent DC Circuit at LOUT Pins for Calculation of R1 and R2

Series Resistor Calculations

Equation 1

Equation 2

Equation 3

Let R1 = R2

Equation 4

Notes:

N = 2

RL = 50 ohms

VLOUT = 2.326 V

ILOUT = 7.5 mA

Equation 5

Equation 5 should be used to determine the value of R1 and R2 for the particular transformer used by each customer.

LOUT2

LOUT1

VLOUT

–

Notes:

1. RSEC is the DC impedance of the transformer secondary (IC side of transformer).

2. RPRIM is the DC impedance of the transformer primary (line side of transformer).

3. RCORD is the DC impedance of the TE connecting cord; typically 4–6 ohms.

4. N is the transformer turns ratio (N = 2 for Am79C30A/32A).

5. RL is the S-interface line impedance (50 ohms).

6. ILOUT is the desired load current for the CCITT transmission templates (7.5 mA for 50-ohm line).

7. VLOUT is the nominal output voltage from the DSC/IDC line driver.

09893H-20

RSEC

RPRIM • N

RCORD • N

RL • N

ILOUT

LOUT

LOU T

SEC

PRIM

•

()

•

()

CORD

•

()

--------------------------------------------------------------------------------------------------------------------------------------------------------------

LOU T

()

LOUT

()

----------------------

SEC

PRI M

•

()

•

()

–

CORD

•

()

–

---

LOUT

-----------------

SEC

PRIM

•

()

•

()

–

COR D

•

()

–







55.067

---R

SEC

PRI M

•

()

COR D

•

()

{}

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