PEB22320 Просмотр технического описания (PDF) - Infineon Technologies

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PEB22320

Primary Rate Access Clock Generator and Transceiver

Infineon Technologies 

PEB 22320

Functional Description

The pulse shape according to CCIT G.703 (1544-kbit/s interface) is achieved by using

the same line length selection code as for the lowest T1 cable range. To switch the

device into a low power dissipation mode, XDIP and XDIN should be held high.

The transmitter requires an external step up transformer to drive the line. The

transmission factor and the source serial resistor values can be seen in figure 8 and

table 7 for the various applications.

R1

XL1

t 11

t2

Line

R1

t 12

XL2

ITS00562

Figure 8

Transmitter Configuration

Table 7

Transmitter Configuration Values

Application

Characteristic line impedance

[Ω]

t11 : t2 = t12 : t2

R1 (± 2.5%) [Ω]

100

26:69

4.3

T1

140 (ICOT) 120

CEPT

75

26:69

6

26:52

15

26:41

15

Wired in this way the transmitter has a return loss

ar > 8 dB for

ar > 14 dB for

ar > 10 dB for

0.025 fb ≤ f ≤

0.05 fb ≤ f ≤

1.0 fb

≤f≤

0.05 fb,

1.0 fb and

1.5 fb,

with fb being 2048 kHz (CEPT applications). A termination resistor of 120 Ω is assumed.

In T1 applications the return loss is higher than 10 dB.

Please note, that the transformer ratio at the receiver is half of that at the transmitter. The

same type of transformer can thus be used at the receiver and at the transmitter. At the

transmitter the two windings are connected in parallel, at the receiver in series. Thus,

unbalances are avoided.

Semiconductor Group

21

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