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MC33596 Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc

Part No. MC33596
Description  PLL Tuned UHF Receiver for Data Transfer Applications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC33596 Datasheet(HTML) 37 Page - Freescale Semiconductor, Inc

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Register Description
MC33596 Data Sheet, Rev. 4
Freescale Semiconductor
37
Values in Table 11 assume the LNA gain is not reduced by the AGC.
AFF[1:0] (Average Filter Frequency) define the average filter cut-off frequency if the AFFC bit is set.
If AFFC is reset, the average filter frequency is directly defined by bits DR[1:0], as shown in Table 10.
If AFFC is set, AFF[1:0] allow the overall receiver sensitivity to be improved by reducing the average
filter cut-off frequency. The typical preamble duration of three Manchester zeroes or ones at the data rate
must then be increased, as shown in Table 13.
16.2 Command Register
Figure 27 describes the Command register, COMMAND.
Table 11. RF Input Level Attenuation
ILA1
ILA0
RF Input Level
Attenuation
See Parameter
Number
0
0
0 dB
2.5
0
1
8 dB
2.6
1
0
16 dB
2.7
1
1
30 dB
2.8
Table 12. Average Filter Cut-off Frequency
AFF1
AFF0
Average Filter Cut-off
Frequency
0
0
0.5 kHz
0
1
1 kHz
1
0
2 kHz
1
1
4 kHz
Table 13. Minimum Number of Manchester Symbols in Preamble
versus DR[1:0] and AFF[1:0]
DR[1:0]
00
01
10
11
AFF[1:0]
00
36
12
24
01
—3
6
12
10
——
3
6
11
———
3


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