CPC5620 datasheet(13/18 Pages) CLARE

13 / 18 page

CPC5620/CPC5621

Rev. 0.E

www.clare.com

3.5.2 Current Limited Applications

TBR-21 sets the telephone line current limit at 60 mA.

To meet this requirement, set RZDC (R16) to 22.1 Ω.

See Clare application note AN-146 Guidelines for Effec-

tive LITELINK Designs for information on FET heat sink-

ing in this application.

3.6 AC Characteristics

3.6.1 Resistive Termination Applications

North American and Japanese telephone line AC ter-

mination requirements are met with a resistive 600

Ω

AC termination. Receive termination is applied to the

LITELINK ZNT pin (pin 29) as a 301

Ω resistor, R

ZNT

(R10).

3.6.2 Reactive Termination Applications

Many countries use a single-pole complex impedance

to model the telephone network transmission line

characteristic impedance as shown in the table below.

Matching a complex impedance requires the use of

complex network on ZNT as shown in the “Reactive

Termination Application Circuit” on page 8.

3.6.3 Mode Pin Usage

Assert the MODE pin low to introduce a 7 dB pad into

the transmit path and add 7 dB of gain to the receive

path. These changes compensate for the gain

changes made to the transmit and receive paths in

reactive termination implementations.

Insertion loss with MODE de-asserted and the resis-

tive termination application circuit is 0 dB. Insertion

loss with the reactive termination application circuit

and MODE asserted is also 0 dB.

Line Impedance Model

TBR-21

Australian

750

820

270

220

150 nF

120 nF

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