AMIS-53050 Datasheet, PDF (54/107 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53050 Frequency Agile Transceiver
Data Sheet
6.4.5.3. Software State
Software state displays the current mode of the AMIS-53050. This status register can be used to monitor the activity of the AMIS-
53050.
Table 30: Software State - 0X3C [60]
Bit Name
State
7:0 ^{Software state}
1111
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
Comment
Undetermined
Startup
Copying ROM data to registers
Calibrating LNA
Calibrating PLL
Calibrating 10kHz oscillator
Calibrating Quick Start (kicker) oscillator
Reading EE data
Writing EE data
Idle
Transmitting
Receiving
Standby
6.5 Receiver
The AMIS-53050 receiver is designed for reception of on/off shift key (AM) or frequency shift key (FM) modulated signals. The receiver
includes all the circuitry to recover data from either the OOK or the FSK modulated signal carrier. The receiver operates on fixed
frequencies in the operating frequency range of 300 to 960MHz using an internal fractional N PLL to set the frequency. The receiver
can reduce power consumption using the Sniff Mode to acquire the incoming signal. The receiver can set a user defined fixed threshold
for data detection or it can form a threshold from the incoming signal for determining the presence of signal and the state of the
recovered waveform. The receiver can use a synchronous data detector to extract the data clock and the data from the incoming signal
(FSK modulation always uses this method of data detection).
OOK modulation (AM)
o Manchester encoding option (600bps to 9.6kbps data rates)
o CDR data detection option (recommended that this be used)
o Common data rates from 1.2kbps to 19.2kbps or user defined
FSK/GFSK modulation (FM)
o Manchester encoding (600bps to 64kbps data rates)
o FFT or PLL demodulation (depends on data rate)
o Common data rates from 1.2kbps to 128kbps or user defined
The AMIS-53050 receiver is a low IF frequency single down conversion, sub-sampling, image rejection architecture with a common
AM/FM IF chain. Three demodulators are used for signal detection with additional post-detection and filtering capabilities for data
recovery.
A complex FFT demodulator is used for FSK signals with data rates > 20kbps.
A digital PLL demodulator is used for FSK signals with data rates less than 20kbps.
A logarithmic (RSSI) detector is used for OOK/ASK signals.
6.5.1. Receiver Circuit Brief Overview
Clock and Data Recovery: The AMIS-53050 can extract a synchronous clock signal from the received data. In this mode, the data in
the received signal is detected, filtered and then fed into the clock and data recovery block where additional digital filtering is performed.
The waveform is sampled using a data clock in the AMIS-53050 to synchronously recover the data. Signal sensitivity is improved and
the recovered data jitter is reduced by this method.
AMI Semiconductor – Jan. 07, M-20639-002
54
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