SP505AN Datasheet, PDF (27/30 Pages) Sipex Corporation – Multi-Protocol Serial Transceivers

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 3.9kΩ
resistor between points A and points B.
A
3.9kΩ
B
V_OC
V_OCA
V_OCB
C
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 50Ω resistors in
series with a center-tap 50Ω 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–V_B ≥ 0V) when the
signal condition 0 is transmitted for data circuits,
or ON for control circuits; and
b) less than point B (V_A–V_B ≥ 0V) when the
signal condition 1 is transmitted for data circuits,
or OFF for control circuits.
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 50Ω resistors
connected in series between point A and point B.
The center point of the two 50Ω resistors
shall measure less than or equal to 0.6V with
respect to point C.
A
50Ω
V_T
50Ω
B
V_OS
C
A
50Ω
50Ω
B
Oscilloscope
50Ω
C
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.
Figure 50. V.35 Driver Terminated Voltage
SP505/6/7APN/03
SP505, SP506, SP507 Application Note
27
© Copyright 2000 Sipex Corporation