psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 93
psb21391
Manufacturer Part Number
psb21391
Description
Siemens Codec With Upn Transceiver
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PSB21391.pdf
(253 pages)
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2.3.9
The half-bauded pseudo-ternary pulse shaping is achieved with the integrated line driver
which drives a binary ’High’ via typical 30
The line driver circuitry is designed to lower the EMI radiation and therefore reducing the
expense for external EMC circuitry. The simplified equivalent circuit of the transmitter is
shown in figure 47.
Figure 47
Equivalent Internal Circuit of the Transmitter Stage
Data Sheet
open
open
V
V
V
V
DDL
DDL
Transmitter Characteristics
SSL
SSL
’+1’
’+1’
’-1’
’-1’
’0’
’0’
Level
Z
Z
i
i
TR_CONF2.DIS_TX
83
output impedance at a line current of 40mA.
’+1’ ’0’ ’-1’
LIa
LIb
trans_stage_upn.vsd
PSB 21391
PSB 21393
Interfaces
2001-03-07
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