HC5515CM datasheet(9/17 Pages) INTERSIL

Part #	HC5515CM

Description	ITU CO/PABX SLIC with Low Power Standby

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Manufacturer	INTERSIL [Intersil Corporation]

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63

on tip and -4V on ring, for a total of -8V margin, is

recommended as a general guideline. The value of RSG is

calculated using Equation 6:

where:

VBAT = Battery voltage, and

VMAR = Voltage Margin. Recommended value of -8V to

allow a maximum overload level of 3.1VPEAK.

For on-hook transmission RL = ∞, Equation 6 reduces to:

SLIC in the Standby Mode

Overall system power is saved by conﬁguring the SLIC in the

standby state when not in use. In the standby state the tip

and ring ampliﬁers are disabled and internal resistors are

connected between tip to ground and ring to VBAT. This

connection enables a loop current to ﬂow when the phone

goes off-hook. The loop current detector then detects this

current and the SLIC is conﬁgured in the active mode for

voice transmission. The loop current in standby state is

calculated as follows:

where:

IL = Loop current in the standby state,

RL = Loop resistance, and

VBAT = Battery voltage.

(AC) Transmission Path

SLIC in the Active Mode

Figure 15 shows a simpliﬁed AC transmission model. Circuit

analysis yields the following design equations:

where:

VTR = Is the AC metallic voltage between tip and ring,

including the voltage drop across the fuse resistors RF,

VTX = Is the AC metallic voltage. Either at the ground

referenced 4-wire side or the SLIC tip and ring terminals,

IM = Is the AC metallic current,

RF = Is a fuse resistor,

ZT = Is used to set the SLIC’s 2-wire impedance,

VRX = Is the analog ground referenced receive signal,

ZRX = Is used to set the 4-wire to 2-wire gain,

EG = Is the AC open circuit voltage, and

ZL = Is the line impedance.

(AC) 2-Wire Impedance

The AC 2-wire impedance (ZTR) is the impedance looking

into the SLIC, including the fuse resistors, and is calculated

as follows:

Let VRX = 0. Then from Equation 10:

ZTR is deﬁned as:

Substituting in Equation 9 for VTR:

Substituting in Equation 12 for VTX:

Therefore:

Equation 16 can now be used to match the SLIC’s

impedance to any known line impedance (ZTR).

Example:

Calculate ZT to make ZTR = 600Ω in series with 2.16µF.

RF =20Ω.

ZT = 560kΩ in series with 2.16nF.

(AC) 2-Wire to 4-Wire Gain

The 2-wire to 4-wire gain is equal to VTX/ VTR.

From Equations 9 and 10 with VRX = 0:

(AC) 4-Wire to 2-Wire Gain

The 4-wire to 2-wire gain is equal to VTR/VRX.

From Equations 9, 10 and 11 with EG = 0:

R

SG

510

5

•

V

BAT

V

MAR

–

()

1

R

DC1

R

DC2

+

()

600R

L

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

+







16.66V

–

×

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

17300

–







=

(EQ. 6)

R

SG

510

5

•

V

BAT

V

MAR

16.66V

–

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

17300

–

=

(EQ. 7)

I

L

V

BAT

3V

–

R

L

1800

Ω

+

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

≈

(EQ. 8)

V

TR

V

TX

I

M

2R

F

•

+

=

(EQ. 9)

V

TX

Z

T

-----------

V

RX

Z

RX

-----------

+

I

M

1000

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

=

(EQ. 10)

V

TR

E

G

I

M

Z

L

•

–

=

(EQ. 11)

V

TX

Z

T

I

M

1000

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

•

=

(EQ. 12)

Z

TR

V

TR

I

M

-----------

=

(EQ. 13)

Z

TR

V

TX

I

M

-----------

2R

F

I

M

•

I

M

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

+

=

(EQ. 14)

Z

TR

Z

T

1000

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

2R

F

+

=

(EQ. 15)

Z

T

1000

Z

TR

2R

F

–

()

•

=

(EQ. 16)

Z

T

1000

600

1

j

ω 2.16

•

10

6

–

•

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

220

•

–

+





•

=

A

24

–

V

TX

V

TR

-----------

Z

T 1000

⁄

Z

T 1000

⁄

2R

F

+

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

==

(EQ. 17)

A

42

–

V

TR

V

RX

-----------

Z

T

Z

RX

-----------

–

Z

L

Z

T

1000

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

2R

F

Z

L

++

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

•

==

(EQ. 18)

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