3465&3485-mfc.ib.rev4.doc
page 19 of 22
17/10/2007
Electrical characteristics SPI:
Line Driver Characteristics (Source)
Output impedance
100
Ω
maximum
Common mode voltage
1.125 V to 1.375 V
Signal amplitude
247 mV to 454 mV
Rise and fall times
< T/7, measured between the 20% and 80% amplitude points, with a 100
Ω
resistive load. The difference between rise and fall times shall not exceed T/20.
Line Receiver Characteristics (Destination)
Input impedance
90
Ω
to 132
Ω
Maximum input signal
2.0 Vp-p
Minimum input signal
100 mVp-p
General Information on DVB-ASI
For transport, the 270 Mb/s stream may be fed through DA’s and switchers without regard for the underlying data
rate, thus simplifying system design.
Note that the ASI signal is polarity sensitive. Although most 270 Mb/s SDI DA’s and switchers will pass ASI
signals, the line drivers used usually have both inverted and non-inverted outputs. For ASI, only those outputs that
are non-inverted may be used.
Electrical characteristics ASI:
Transmitter output characteristics:
Output voltage
800 mVp-p
±
10%.
Deterministic jitter
<10% p-p.
Random jitter
<8% p-p.
Rise/fall time (20-80%)
<1.2 ns.
Receiver input characteristics:
Minimum sensitivity (D21.5 idle pattern)
200 mV
Maximum input voltage
880 mVp-p
s
11
(range: 0.1 to 1.0 x bit rate)
-17 dB
Minimum discrete connector return loss
15 dB (5 MHz - 270 MHz)
Coaxial link:
Impedance 75
Ohm
Equipment connector
BNC female
(Electrical measurements made with 75 Ohm resistive termination.)
