PEB2256H-V12 Infineon Technologies, PEB2256H-V12 Datasheet - Page 125
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PEB2256H-V12
Manufacturer Part Number
PEB2256H-V12
Description
IC INTERFACE LINE 3.3V 80-MQFP
Manufacturer
Infineon Technologies
Datasheet
1.PEB2256H-V12.pdf
(490 pages)
Specifications of PEB2256H-V12
Applications
*
Interface
*
Voltage - Supply
*
Package / Case
80-SQFP
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
PEB2256H-V12
PEB2256H-V12IN
PEB2256H-V12IN
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PEB2256H-V12
Manufacturer:
Infineon Technologies
Quantity:
10 000
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• Detection:
• Recovery:
If a loss-of-signal condition is detected in long-haul mode, the data stream can optionally
be cleared automatically to avoid bit errors before LOS is indicated. The selection is
done by LIM1.CLOS = 1.
5.1.9
The receive jitter attenuator is placed in the receive path. The working clock is an
internally generated high frequency clock based on the clock provided on pin MCLK. The
jitter attenuator meets the requirements of PUB 62411, PUB 43802, TR-TSY 009,TR-
TSY 253, TR-TSY 499 and ITU-T I.431, G.703 and G. 824.
The internal PLL circuitry DCO-R generates a "jitter-free" output clock which is directly
depending on the phase difference of the incoming clock and the jitter attenuated
clock.The receive jitter attenuator can be synchronized either on the extracted receive
clock RCLK or on a 1.544-, 2.048-MHz or 8-kHz clock provided on pin SYNC (8 kHz in
master mode only). The received data is written into the receive elastic buffer with RCLK
and are read out with the de-jittered clock sourced by DCO-R. The jitter attenuated clock
can be output on pins RCLK, CLK1 or SCLKR. Optionally an 8-kHz clock is provided on
pin SEC/FSC.
The DCO-R circuitry attenuates the incoming jittered clock starting at 6-Hz jitter
frequency with 20 dB per decade fall-off. Wander with a jitter frequency below 6 Hz is
passed unattenuated. The intrinsic jitter in the absence of any input jitter is < 0.02 UI.
For some applications it might be useful starting of jitter attenuation at lower frequencies.
Therefore the corner frequency is switchable by the factor of ten down to 0.6 Hz
(LIM2.SCF).
The DCO-R circuitry is automatically centered to the nominal bit rate if the reference
clock on pin SYNC/RCLK is missed for 2, 3 or 4 of the 2.048-MHz or 1.544-MHz clock
Data Sheet
An alarm is generated if the incoming data stream has no pulses (no transitions) for a
certain number (N) of consecutive pulse periods. “No pulse” in the digital receive
interface means a logical zero on pins RDIP/RDIN or ROID. A pulse with an amplitude
less than Q dB below nominal is the criteria for “no pulse” in the analog receive
interface (LIM1.DRS = 0). The receive signal level Q is programmable by three control
bits LIM1.RIL(2:0) (see
register (PCD). The contents of the PCD register is multiplied by 16, which results in
the number of pulse periods, i.e. the time which has to suspend until the alarm has to
be detected. The programmable range is 16 to 4096 pulse periods.
In general the recovery procedure starts after detecting a logical "1" (digital receive
interface) or a pulse (analog receive interface) with an amplitude more than Q dB
(defined by LIM1.RIL(2:0)) of the nominal pulse. The value in the 8 bit register PCR
defines the number of pulses (1 to 255) to clear the LOS alarm. Additional recovery
conditions are programmed by register LIM2.
Receive Jitter Attenuator (T1/J1)
Chapter 11.3
on page 447). The number N is set by an 8 bit
125
Functional Description T1/J1
FALC56 V1.2
PEB 2256
2002-08-27
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