tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 68

• Manufacturer Part Number: tda5235
• Description: Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
• Manufacturer: Infineon Technologies Corporation

The synchronization search time T
pattern in an incoming data stream and needs to be considered in the receivers start-up
phase. The minimum value of the search time out length is the consequence of the
system latency time T
transmitter and receiver.
This means, that for the minimum length of register value for SYSRCTO, the value 2 bits
plus 12.5 µs plus the RUNIN length, which is set in the x_CDRRI register, plus 2 bits (to
consider worst case RUNIN patterns and TX-RX asynchronism) have to be used. To
reach data rate and duty cycle errors, 10% of the overall sum must be added.
A second important system parameter that must be considered, is the minimal Inter-
Frame Time (time between two data frames). This time is equal to the time T
length of 1.5 or 2 bits
INITDRXES is disabled. Otherwise T
Note that the described Inter-Frame Time is based on the input pattern with equal signal
power in the following data frame; in other cases, the Inter-Frame Time can vary from
the calculated value.
1) see previous footnote
2) in case INITDRXES is enabled
Data Sheet
SYSRCT0
1)
1
. The EOM to PLL resynchronization time is negligible in case
T
=
, the RUNIN length and the time of asynchronism between
Inter Frame
roundup
–
⎛
⎝
3
⎛
⎝
1
=
⎛
⎝
is the time the receiver requires to search for a
has to be added.
12.5μs
---------------- -
1.5T
T
bit
68
bit
+ +
+
2
⎛
⎜
⎝
0.5T
RUNLEN
0
1 )
bit
2)
⎞
⎟
⎠
+
⎛
⎜
⎝
T
0
+
2 )
1
Functional Description
2
⎞
⎟
⎠
⎞ 16
⎠
⋅
⎞ 1.1
⎠
⋅
V1.0, 2010-02-19
⎞
⎠
2
TDA5235
and has a