PXB4219EV34NP Infineon Technologies, PXB4219EV34NP Datasheet - Page 76
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PXB4219EV34NP
Manufacturer Part Number
PXB4219EV34NP
Description
Manufacturer
Infineon Technologies
Datasheet
1.PXB4219EV34NP.pdf
(290 pages)
Specifications of PXB4219EV34NP
Data Rate
2.048Mbps
Number Of Channels
1
Operating Supply Voltage (typ)
3.3V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Not Compliant
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Figure 20
The tuning range of the DCO is limited to the value programmed to bits “tur” in register
“condN”. If the phase detector requests a higher frequency deviation the DCO enters
out-of-range condition. In this case the DCO’s output will be clipped and bit “max” of
register “statN” will be set. If the number of out-of-range conditions during 16 ATM cells
exceeds the value given by field “tr_acm” of register “treshN”, an out-of-lock message,
indicated via field “ola” of register “oolN”, is generated.
Increasing the loop-gain reduces the damping of the PLL-ACM. This will reduce the rise
time but results in overshoot and long lock-in times.
Reducing the loop-gain increases the damping. This results in lower cut off frequencies,
and prevents overshoot. Thus, CDV is less likely to drive the PLL out of lock. The rise
and lock-in time are increased. If the loop-gain is too low, the amount of bytes required
to drive the DCO over it's tuning range could cause a data buffer over- or underflow.
Optimized damping allows minimum lock-in time without overshoot. In this case PLL-
ACM’s frequency is moving asymptotically to the correct value.
Data Sheet
0.1
0.9
f/f
1
0
Transient Parameters
2d
Tr1
Tr
Mp
Tp
76
PXB 4219E, PXB 4220E, PXB 4221E
Tl
Tr, Tr1: Rise time
Tp:
Tl:
Mp:
2d:
f
0
:
Operational Description
Peak time
Lock in time
Peak overshoot
Tuning range
Target frequency
ACM Transient Parameters
IWE8, V3.4
2003-01-20
t
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