AM79M535 datasheet(12/18 Pages) AMD

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Am79M535 Data Sheet

Table 2.

User-Programmable Components

ZT is connected between the VTX and RSN pins. The fuse

resistors are RF, and Z2WIN is the desired 2-wire AC input

impedance. When computing ZT, the internal current amplifier

pole and any external stray capacitance between VTX and

RSN must be taken into account.

ZRX is connected from VRX to the RSN pin, ZT is defined

above, and G42L is the desired receive gain.

RDC1, RDC2, and CDC form the network connected to the

RDC pin. RDC1 and RDC2 are approximately equal.

RD and CD form the network connected from RD to –5 V and

IT is the threshold current between on hook and off hook.

ZM is connected from VMG (metering source) to the RSN pin,

VM2W is the desired magnitude of the metering signal at the

2-wire output (usually 2.2 Vrms) and K1 ( ) is defined below.

where: CX = The values of the identical capacitors from

A and B to GND

metering frequency

510 Z

2W IN

–

()

42L

-----------

1000

•

510 Z

()

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

•

DC I

DC2

2500

FEED

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

1.5 ms

DC 1

DC2

DC1

DC 2

•

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

•

365

---------

0.5 ms

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

M2W

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

1 ω

() Z

•

0.51

1 ω

() 2R

()

•

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

•

1 ω

()

1000

ω 11.5 10

–

CX 2

⁄

•

() 36 Z

()

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

π•

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