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CX28331 датащи(PDF) 36 Page - Synaptics Incorporated.

номер детали CX28331
подробное описание детали  Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
PDF  68 Pages
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производитель  CONEXANT [Synaptics Incorporated.]
домашняя страница  https://www.synaptics.com/
Logo CONEXANT - Synaptics Incorporated.

CX28331 датащи(HTML) 36 Page - Synaptics Incorporated.

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2.0 Functional Description
CX28331/CX28332/CX28333
2.2 Transmitter
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
2-4
Conexant
100985A
For DS3/STS-1 rates, a pulse-shaper block is used to shape the transmit
waveform and reduce its high-frequency energy content. This ensures that the
transmit pulse template is met at the cross-connect block, which follows 0–450
feet of transmit-side coaxial cable.
2.2.3 Line Driver
The differential line driver takes the filtered transmit waveform, increases it to the
proper level, and drives it into the transmit magnetics. The two external discrete
back-matching resistors (36
Ω) aid in line matching. The driver is presented with
an approximately 150
Ω differential load. Driver gain accounts for the 6 dB gain
loss in the back-matching resistors.
Figure 2-3 illustrates the Pulse/Power template measurement points for the
various data rates.
Figure 2-3. Pulse Measurement Points
0–450 ft COAX
(type 734/728)
DSX
0–450 ft COAX
Pulse/Power Template for E3
Pulse/Power Template for DS3/STS-1
(type 734/728)
DSX
0–450 ft COAX
(type 734/728)
0–450 ft COAX
(type 734/728)
TX
RX
RX
TX
100604_013



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