PEF24902HV21ZT Lantiq, PEF24902HV21ZT Datasheet - Page 31

• Manufacturer Part Number: PEF24902HV21ZT
• Manufacturer: Lantiq

Specifications of PEF24902HV21ZT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Table 10
Parameter
Cut-off frequency of the input filter
Threshold of level detect (2B1Q)
Threshold of level detect (4B3T)
DC level of level detect (common mode level)
3.4
On the digital interface transmit and receive data is exchanged as well as control
information for the start-up procedure. The ADC output is transferred to the Quad IEC
DFE-T Version 2.2 or Quad IEC DFE-Q Version 2.2 on the signals PDM0..PDM3. The
timing of all signals in 2B1Q mode as well as 4B3T mode is based on the 15.36 MHz
clock which is provided by the IEC-4-AFE-X Version 3.2.
The transmit data, power up/down, range function and loopback are transferred on SDX,
and the level status on SDR for all line ports. Eight time slots contain the data for up to
eight line ports. The IEC-4-AFE-X Version 3.2 operates in slots 1, 3, 5, 7. The remaining
slots are reserved for future use. The allocation of these time slots is done by the ninth
time slot, a 24-bit synchronization word on SDX, that consists of all ZEROs. The other
time slots with transmission data start with a ONE. Therefore the first ONE after at least
24 subsequent ZEROs must be the first bit of time slot number 0. This information is also
used to determine the status of synchronization of the digital interface after reset.
The line code independent data on SDX:
NOP:
PDOW:
RANGE:
LOOP:
Data Sheet
The no-operation-bit is set to ZERO if none of the control bits (PDOW,
RANGE and LOOP) shall be changed. The values of the control bits of the
assigned line port is latched. The states of the control bits on SDX are
ignored, they should be set to ZERO to reduce any digital cross-talk to the
analog signals.
The NOP bit is set to ONE if at least one of the control bits shall be changed.
In this case all control bits are transmitted with their current values.
If the PDOW bit is set to ONE, the assigned line port is switched to power
down. Otherwise it is switched to power up.
RANGE = ONE activates the range function, otherwise the range function is
deactivated. "Range function activated" refers to high input levels.
LOOP = ONE activates the loop function, i.e. the loop is closed. Otherwise
the line port is in normal operation.
Digital Interface
Specified Data of the Level Detection Circuit
31
Min.
90
4
10
0
Limit Values
160
Typ.
Functional Description
Max.
230
20
30
3
Rev. 1, 2004-05-28
Unit
KHz
mV
mV
V
PEB 24902
PEF 24902