AMIS-52150 Datasheet, PDF (9/21 Pages) AMI SEMICONDUCTOR – Low-Power Transceiver with Clock and Data Recovery

AMIS−52150
RFOUT, RF Output Signal Pin
In the AMIS−52150, a high efficiency non-linear output
driver is used to produce the high power RF signal. This
driver must be connected through a DC connection to the
RFPWR pin. External components are required to match the
output to a 50 W load, or to an external antenna, respectively.
Figure 5 shows a typical matching circuit for the RFOUT
pin.
Figure 5. Typical RFOUT Output Impedance Match to 50 W (402 MHz)
CIRCUIT FUNCTIONAL DESCRIPTION
The functions of the AMIS−52150 are presented in this
section. These functions are:
 Receiver
 Transmitter
 Sniff Mode
 Quick Start
 Data Detection
 Data and Clock Recovery
 Application Wake-up
 I²C Interface
 Registers
 Power-on-Reset/Brown-out
 Alternative Wake-up
Receiver
RF signals often suffer from reflections along the path of
propagation. These reflected signals arrive at the receiver
antenna with different phases or time delays. The different
phases of the reflected signals cause the signal strength at the
receiver to vary. This variation can be large enough to cause
the receiver to miss information. The AMIS−52150 sums
the signals from the dual receiver channels within the data
detection circuits. This reduces the effect of multi-path
reflections. Proper operation requires a) trimming aimed at
minimizing the frequency tolerances, b) tuning of the
oscillator frequency, c) selection of the data rate filters, and
d) setting of a signal threshold, as shown in Table 15.
Table 16 lists some characteristic parameters for the
receivers. Figure 6 shows a typical received data waveform.
Figure 6. Received Waveform
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