參數(shù)資料
型號(hào)： AMIS-53000
英文描述： Frequency Agile Transceiver
中文描述： 捷變頻收發(fā)器
文件頁(yè)數(shù)： 52/99頁(yè)
文件大小： 2638K
代理商： AMIS-53000
AMIS-53000
Frequency Agile Transceiver
Data Sheet
6.5.1.4.
Data Recovery
Table 36: Receiver Configuration
RX Configuration Registers
0X0E RX Config
0X1F CDR
Options A
0X0B Data Rate
Format
0X1E
Filter
Slice
Bit 2
Mod
Bit 0
Demod
Bit 3
Code
Bit 1:0
Data Rage
Preamble
CDR
SOF
0
NRZ
SLICE
SLICE
2
1
2
>20k – 128k
10Pattern
Yes
3
Yes
3
Yes
3
No
No
4
0
FFT
1
Man
>20k – 128k
10Pattern
0
NRZ
SLICE
1
2
<20k
10Pattern
No
0
FM
1
PLL
0X55
0XAA
1
Man
SLICE
2
<20k
All 1 or 0’s
Yes
3
0
NRZ
SLICE
2
SLICE
2
SLICE
2
SLICE
2
1k – 19.2k
CW
Opt
7
Opt
7
Opt
7
Opt
7
0X55
0
NA
6
1
Man
1k – 19.2k
CW
0X0A
0
NRZ
1k – 19.2k
CW
0X55
1
AM
1
NA
6
1
Man
1k – 19.2k
CW
0X0A
Notes:
1. Long strings of 1’s or 0’s will degrade the performance of the CDR circuits.
SLICE can use the parameters in Table 38.
sed to detect the data. (SeeTable 41 and Table 42 for CDR parameters)
a SOF. A unique SOF (suggested 0x66) is used to bit-align the Manchester decoder to the recovered data.
0X55 or 0X0A SOF have the following requirements:
It is suggested that CDR with activity check be enabled with 8 or 16 bit times
It is suggested that the preamble be long enough to trigger activity check
0x0A The following is suggested:
It is suggested that CDR with fast phase alignment be enabled
(10 or 20 bit times)
It is suggested that CDR with activity check be enabled with 4 bit times
It is suggested that the preamble be long enough to trigger activity check
t the parameter is not available for the AM/OOK modulated signals.
6. NA indicates tha
7. OPT indicates that CDR is an option to detect the data however, it is recommended that CDR be used. (See Table 41 andTable 42 for CDR parameters)
A
M Data Recovery with RSSI
The logarithmic AM detector, used with OOK/ASK modulated signals, produces an RSSI output signal with approximately 18mV/dB
output level. A low pass filter provides additional filtering matched to the AM signal data rate (1.2, 1.8, 2.4, 4.8, 7.2, 9.6, 14.4,
19.2kbps). This filtered signal is sampled and compared to the slice threshold to recover the digital data. The slice threshold can be
set to a fixed value or it can use a signal tracking circuit to set a peak or average threshold.
The RSSI output signal can also be applied to a clock and data recovery circuit, which synchronizes an AMIS-53000 internal clock with
the incoming data rate (See CDR Operation).
Setup registers descriptions:
Slice Threshold
- The slice operation needs to be selected, fixed or automatic. The value for the fixed threshold needs to be
set.
Filter/Slice
- Filter settings and slice mode need to be selected.
Slice Threshold
Sets the data slice level for AM reception. This threshold is used when the slice method sets in the AM data filter and slice options is
set to DAC.
2.
3. Yes indicates that CDR is always u
4. Manchester encoded data requires
5.
0x55 The following is suggested:
It is suggested that CDR with fast phase alignment be enabled
52
AMI Semiconductor
– Aug. 05, Rev. 1.0
www.amis.com
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