SP506 datasheet(26/30 Pages) SIPEX

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SP505/6/7APN/03

SP505, SP506, SP507 Application Note

6.3.1.4 Generator polarities

The driver's single-ended output A shall be:

a) greater than point C (V

OUT > 0V) when the

signal condition 0 is transmitted for data

circuits, or ON for control circuits; and

b) less than point C (V

OUT < 0V) when the signal

condition 1 is transmitted for data circuits, or

OFF for control circuits.

6.3.3.5 Receiver maximum shunt capacitance

The total effective shunt capacitance shall be

less than 2500pF at point A with respect to

ground. This is measured by applying a 14V

signal with 0V offset at 9.6kbps with 50% duty

cycle through a 1.2k

Ω resistor. The rise time

measured from -3V to +3V at point A to point C

1) and the fall time measured from +3V to -3V

at point A to point C (t

2) is measured and recorded.

Then replace the receiver with a 3k

Ω resistor in

parallel with a 2500pF capacitor and apply

the same signal through the 1.2k

Ω resistor.

The new rise time (t

3) is recorded and compared

to t

1 and t2. The times t1 and t2 shall be less than

or equal to t

Figure 45. V.28 Driver Open Circuit Voltage

Figure 46. V.28 Driver Terminated Voltage

Figure 47. V.28 Transition Time

Figure 48. V.28 Receiver Effective Shunt Capacitance

Ω

2500pF

Oscilloscope

1.2k

Ω

9600bps, 14.0Vp-p

Square Wave

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