AMIS−52150
Table 15. RECEIVER CONTROL REGISTERS
RX1 or RX2 Receiver Register Control
Register (HEX)
0x00
Name
Bits
States
Comments
ANT1 Trim
All
All
All
All
0
Inverse Relationship Register Value to Internal Capacitance
Inverse Relationship Register Value to Internal Capacitance
0x01
ANT2 Trim
0x05
RX XTAL Tune
Data Threshold
ANT1 Enable
0x0a
Reference Level for Detecting Data Logic State
0x0c
0
1
Antenna Port is Off
Antenna Port is On
Antenna Port is Off
Antenna Port is On
Receiver is Off
Receiver is On
1.1 kHz
ANT2 Enable
RX Enable
Data Filter
1
3
0
1
0
1
0x0f
4, 5, 6
000
001
010
011
100
101
110
111
0
2.3 kHz
5.2 kHz
10.4 kHz
1.18 kHz
2.57 kHz
7.0 kHz
20.45 kHz
0x1e
TX/RX Invert
5
Normal Levels
Inverted
1
Table 16. RF INPUT ELECTRICAL CHARACTERISTICS
Specification
Input Resistance
Input Capacitance
Settings
Conditions
Typ
2
Max
−
Unit
kW
Comments
Trim 0x00
Trim 0xff
Min. Tune
Max. Tune
1 kbps
3
−
pF
6
−
pF
Sensitivity
Frequency
Max. Input
IP3
−117
403.5
−
−
dBm
MHz
dBm
dBm
dBm
w/CDR
Target Frequency
−
−10
−
+8
IP2
+66
−
Transmitter
The RF transmitter is a non-linear open drain device. It
requires a DC signal path to RFPWR, which is the output of
the internal power supply to the transmitter. The transmitter
is switched On and Off with the serial transmit data stream.
To achieve the desired output waveform, a tuned external
resonant circuit is required. This resonant circuit should be
designed to achieve the desired output frequency. This
circuit includes a parallel LC tank (Lp and Cp) tuned to
402 MHz (including internal capacitance), as well as a series
LC (Ls and Cs) to produce a 403 MHz output. The
transmitter output is also to be filtered in order to reduce the
harmonics to acceptable levels. It is further required that the
transmitter output power level is programmed, that the
transmit frequency is tuned and that the data rate is selected,
respectively (Table 17).
Table 18 lists some characteristic parameters for the
transmitter, while a typical transmitter output waveform is
shown in Figure 7.
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