PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 132

• Manufacturer Part Number: PEF22827EL-V11
• Manufacturer: Lantiq

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

8
This section describes the following:
•
8.1
To achieve typical power of 10 dBm for VDSL on the line, you must determine the
insertion loss of the hybrid and the transmitter filter (see
impedance of the transmission filter, insert additional resistors in each part of the
transmitted signal. The resistors R
transmission filter. Thus, 3 dB power is dissipated at these resistors. Another 3 dB is
dissipated due to the hybrid implementation loss L
Transmission power at the line driver output pins is calculated as follows:
where:
•
•
•
The necessary rms voltage V
with :
Preliminary Data Sheet
Calculating Line Driver Gain in a VDSL Application
P
L
L
ins1
ins2
out
Pout dBm
Pout dBm
: Transmit power at the line driver output pins.
: Insertion loss transmit filter (dependent on the filter device, typ. 0.5 dB)
: Insertion loss hybrid (dependent on the hybrid device, typ. 0.5 dB)
R
1
Operation – Line Driver
Calculating Line Driver Gain in a VDSL Application
V
+
Pout W
Pout W
rms
V
R
rms
2
+
=
=
R
=
=
e
10dBm
Pout W
10dBm
=
=
=
50mW
1mW
1mW
20
+
L,rms
+
+
3dBm
6dBm
10
10
20
at the line driver output pins is calculated as follows:
R


80
17
----- -
10


1
Pout dBm
----------------------------- -
1


+
=
+
+
+ R
+
R
=
10
40
L
50mW
0 5dBm
2
imp1
2V
+
132
2
R
=
must equal the internal impedance of the


e
+
80
L
+
ins1
impl
0 5dBm
+
.
L
Figure
ins2
=
Vrms
W
W
17dBm
V
Operation – Line Driver
23). To match the power
dBm
Rev. 1.1, 2005-01-30
VDSL6100i
PEF 22827