PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 77

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

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

The digital block controls filter tuning in the AFE with the
WAK_PLL_TUN_RF
The tuning cycle for pre-filter and post-filter parameter adjustment is set by the digital
block software.
A 0 to 1 transition of
tuning cycle. The filter tuning unit measures the current filter time constant of a reference
circuit (analog tuning measurement circuit) and adjusts the analog filter parameters
accordingly. When the tuning process is finished,
WAK_PLL_TUN_RF
Figure 10
5.5
The transmission path of the Analog Block includes a Digital-to-Analog Converter (DAC),
a Post Filter (POFI) and a Power Controller (POCO).
transmission path.
5.5.1
The DAC has a resolution of 13 bits (11 bits
Preliminary Data Sheet
Circuit (Analog)
Measurement
Tuning
Transmission Path
Digital-to-Analog Converter (DAC)
Filter Tuning Unit Functional Block Diagram
Measurement
TUNE_START
(0D
register at 0D
Start
Stop
H
) and
Internal Value
from
Measurement
XTAL_TUN_PAR
H
) is set to 1.
POFI
(bit 1 of the
Filter Tuning Unit
Parameters
Set Analog
Filter
77
eff
) and an analog bandwidth of 12 MHz.
Functional Description – Analog Block
PREFI
FC_TUNE
(0F
H
) registers, as described here.
TUNE_READY
register at 0C
Figure 9
Control Interface
VDSL-A_0024_tuning circuit
Rev. 1.1, 2005-01-30
FC_TUNE
illustrates the
(bit 5 of the
VDSL6100i
PEF 22827
H
) triggers a
(0C
H
),