PEF2256EV22NP Lantiq, PEF2256EV22NP Datasheet - Page 106

• 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

6.4.2
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 by the digital transmitter.
Figure 27
Table 24
Parameter
R
t1 : t2
1)
Similar to the receive line interface three different data types are supported:
•
•
•
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
Single-rail data is converted into a ternary signal which is output on pins XL1 and
XL2. The HDB3 and AMI line code is employed. Selected by FMR0.XC1/0 and
LIM1.DRS = 0.
Dual-rail data PCM(+), PCM(–) at multifunction ports XDOP/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.XC1/0 and LIM1.DRS = 1.
Unipolar data on port XOID is transmitted either in NRZ (Non Return to Zero) with
100% duty cycle or in CMI (Code Mark Inversion or known as 1T2B) Code with or
without (FMR3.CMI) preprocessed HDB3 coding to a fiber-optical interface. Clocking
off data is done with the rising edge of the transmit clock XCLK (2048 kHz) and with
a programmable polarity. Selection is done by FMR0.XC1 = 0 and LIM1.DRS = 1.
Transmit Line Interface (E1)
Line
Transmitter Configuration (E1)
Recommended Transmitter Configuration Values (E1)
t
2
t
1
R
R
1
1
106
XL1
XL2
Characteristic Impedance [ ]
120
7.5
1 : 2.4
1)
Functional Description E1
75
7.5
1 : 2.4
Rev. 1.1, 2005-06-13
1)
PEF 2256 H/E
F56V2_Transm itter_1
FALC
®
56