psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 94

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
2.3.10
The SCOUT-P(X) covers the electrical requirements of the U
of up to 4.5 kft on AWG 24 cable and 1.0 km on J-Y(ST) Y 2
The receiver consists of a differential input stage, a peak detector and a set of
comparators.
A simplified equivalent circuit of the receiver is shown in figure 48.
Figure 48
Equivalent Internal Circuit of the Receiver Stage
The data detection threshold Vref of the peak detector is continuously adapted to the line
level. The peak detector requires maximum 2 s to reach the peak value while storing
the peak level for at least 250 s (RC > 1 ms).
The additional level detector for power up/down control works with a fixed threshold
voltage VrefLD. The level detector monitors the line input signals to detect whether an
INFO is present.
In order to additionally reduce the bit error rate in severe conditions, the SCOUT-P(X)
performs oversampling of the received signal and uses majority decision logic. The
receive signal is sampled at 15.36MHz clock intervals (XTAL).
Receiver Characteristics
84
PN
2
interface for loop lengths
0.6 cable.
PSB 21391
PSB 21393
Interfaces
2001-03-07