參數(shù)資料
型號(hào)： AMIS-52100-A
英文描述： Transceiver with Clock and Data Recovery
中文描述： 收發(fā)器時(shí)鐘和數(shù)據(jù)恢復(fù)
文件頁(yè)數(shù)： 14/26頁(yè)
文件大小： 1040K
代理商： AMIS-52100-A
AMIS-52100
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Table 22: Transmitter Control Registers
TX/RX Definition Control Registers
Register (HEX)
0x02
0x04
0x0c
Name
TX power
TX XTAL trim
TX enable
Bits
All
All
4
States
0
1
000
001
010
011
100
101
110
111
0
1
Comments
Transmitter is off
Transmitter is on
1.1kHz
2.3kHz
5.2kHz
10.4kHz
1.18kHz
2.57kHz
7.0kHz
20.45kHz
Normal levels
Inverted
0x0f
Data filter
4,5,6
0x1e
TX/RX invert
5
Table 23: Output Impedance Characteristics
Specification
Settings
Output
Impedance
RFPWR 0x00
Output Power
RFPWR 0xff
Harmonics
Range
Modulation
On/Off Ratio
TX output
Conditions
Resistance
Capacitance
Ext circuit
Target
Quick Start
Full range
Min.
11
402
350
300
Typ.
22
3
-26
12
-35
Max.
13
405
448
768
Units
pFarads
dBm
dBm
dBm
MHz
MHz
MHz
dBm
Frequency
ASK/OOK
70
Figure 8: Transmit Waveforms
9.3 Sniff Mode
Very low power applications will want to program the AMIS-52100 to use the Sniff Mode. This mode turns the receiver and crystal
oscillator off for a programmed time. At the end of this time the receiver wakes and “sniffs” for incoming RF energy. If energy is
detected, the receiver wakes the full receive function and starts data recovery from the RF carrier. If energy is not detected, the receiver
returns to the low power or “sleep” state. The operation of the Sniff Mode is very programmable. The time that the receiver is asleep
can be programmed from microsecond to seconds. Once the receiver wakes to detect RF energy, there is a programmable delay
before the receiver checks for energy. There is another delay that accounts for circuit delays. Finally, there is a programmable delay
after energy is detected and before the receiver samples the recovered energy to determine the logical state of the recovered data.
Table 24 lists these registers. Refer to the AMIS application note “Sniff Mode” for more information.
Figure 9 and Figure 10 show waveforms that show the timing of the Sniff Mode.
14
AMI Semiconductor
– Rev 4.0, Mar. 06 – M-20535-004
www.amis.com
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