SP506CF datasheet(27/30 Pages) SIPEX

27 / 30 page

SP505/6/7APN/03

SP505, SP506, SP507 Application Note

Paragraph 6.3.4 – V.35 Circuits

6.3.4.1 Generator open circuit output voltage

The magnitude of the driver's outputs for:

a) between point A and point B

b) either point A or point B to point C

shall be less than or equal to 1.2V for either

binary state when terminated with a 3.9k

Ω

resistor between points A and points B.

Figure 49. V.35 Driver Open Circuit Voltage

6.3.4.2 Generator terminated output voltage

The magnitude of the driver's outputs for:

a) between point A and point B

b) either point A or point B to point C

shall be 0.55V +20% for either binary state

when terminated with two 50

Ω resistors

connected in series between point A and point B.

The center point of the two 50

Ω resistors

shall measure less than or equal to 0.6V with

respect to point C.

Figure 50. V.35 Driver Terminated Voltage

6.3.4.3 Generator output rise/fall time

The driver outputs' transition from one binary

point to another shall be less than or equal to 0.1

of the nominal bit duration (t

b). This is measured

between 20% and 80% of its steady state value

and with a "Y" resistor configuration. The

resistor network contains two 50

Ω resistors in

series with a center-tap 50

Ω resistor between

the two series resistors to ground.

6.3.4.4 Generator polarities

The driver's point A output shall be:

a) greater than point B (V

A–VB ≥ 0V) when the

signal condition 0 is transmitted for data circuits,

or ON for control circuits; and

b) less than point B (V

A–VB ≥ 0V) when the

signal condition 1 is transmitted for data circuits,

or OFF for control circuits.

Figure 51. V.35 Transition Time

The SP505 has been successfully tested to CTR1/

CTR2 through TUV Telecom Services. The test

was performed on the SP505EB Evaluation

Board. The test report CTR2/052101/98 can

be furnished upon request. The SP507 has

also successfully passed the CTR1/CTR2

testing requirements through KTL using our

SP507EB. The test report 9D2566DEU1 can

also be furnished upon request.

Please contact Sipex Applications for details.

3.9k

Ω

OCA

OCB

Ω

Oscilloscope

Ω

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