PEF2256EV22NP Lantiq, PEF2256EV22NP Datasheet - Page 168

• Manufacturer Part Number: PEF2256EV22NP
• Manufacturer: Lantiq

Specifications of PEF2256EV22NP

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.4.2
The analog transmitter transforms the unipolar bit stream to ternary (alternate bipolar)
return to zero signals of the appropriate programmable shape. The unipolar data is
provided on pin XDI and the digital transmitter.
Similar to the receive line interface three different data types are supported:
Figure 55
Table 42
Parameter
Characteristic Impedance [ ]
R
t1 : t2
1)
•
•
•
Data Sheet
1
This value refers to an ideal transformer without any parasitics. Any transformer resistance or other parasitic
resistances have to be taken into account when calculating the final value of the output serial resistors.
( 1%) [ ]
Ternary Signal
XL2. Selection between B8ZS or simple AMI coding with zero code suppression (B7
stuffing) is provided. B7 stuffing can be disabled on a per time slot basis (Clear
Channel capability). Selected by FMR0.XC1/0 and LIM1.DRS = 0.
Dual-rail data PCM(+), PCM(-) at multifunction ports XDOP and XDON with 50% or
100% duty cycle and with programmable polarity. Line coding is done in the same
way as in ternary interface mode. Selected by FMR0.XC1 = 1 and LIM1.DRS = 1.
Unipolar data on port XOID is transmitted in NRZ (non return to zero) with 100% duty
cycle or in CMI code with or without (SIC3.CMI) preprocessed by B8ZS coding to a
fiber-optical interface. Clocking off data is done with the rising edge of the transmit
clock XCLK (1544 kHz) and with a programmable polarity. Selection is done by
FMR0.XC1 = 0 and LIM1.DRS = 1.
Single-rail data is converted into a ternary signal which is output on pins XL1 and
Transmit Line Interface (T1/J1)
Line
Transmitter Configuration (T1/J1)
Recommended Transmitter Configuration Values (T1/J1)
t
2
t
1
R
R
1
1
168
XL1
XL2
T1
100
2
1 : 2.4
1)
Functional Description T1/J1
J1
110
Rev. 1.1, 2005-06-13
PEF 2256 H/E
F56V2_Transm itter_1
FALC
®
56