AMIS-53000 Datasheet, PDF (6/99 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53000 Frequency Agile Transceiver
Data Sheet
• Receiver sensitivity
o –115dBm (OOK @ 1kbps)
o –105dBm (FSK @ 20kbps)
• Receiver current: 12mA (continuous)
• Minimum RX energy detect time: 130uS (Sniff)
1.4 Circuit Overview
1.4.1. Transmitter
The AMIS-53000 uses a driver and class E power amplifier to output the on/off shift keyed or frequency shift keyed RF waveforms. The
class E power amplifier has two output power ranges allowing more efficient output power for the one setting up to 0dBm output and the
other setting for output power greater than 0dBm. The class E power amplifier can achieve output power of +12dBm to +15dBm for
frequencies in the range of 300MHz to 915MHz. The output power is programmable in each of the two output power bands.
The transmit data can be NRZ or Manchester encoded. Data can also be modulated as on/off shift keyed or frequency shift keyed.
Data rates for the OOK modulation can be as high as 19.2kbps. Data rates for the FSK/GFSK modulation can be as high as 128kbps.
The carry frequency deviation for the FSK modulation is programmable, typically one half to one times the data rate.
The transmit data output can be wave shaped with a Gaussian format. This can reduce the occupied bandwidth of the signal.
1.4.2. Receiver
The AMIS-53000 has a single receiver channel and a single transmit channel, which can be connected to individual antennas or can be
combined into a single antenna. The receiver uses four different methods to receive and recover data that has been on/off shift keyed
or frequency shift keyed modulated. The FSK/GFSK data is recovered using either a PLL circuit or a FFT circuit along with a CDR
circuit. The OOK data is recovered using an RSSI circuit along an optional CDR circuit. It is suggested that the CDR circuit be used
when receiving OOK signals.
1.4.2.1. On/Off Shift Key Modulation
The AMIS-53000 uses a logarithmic received signal strength indicator (RSSI) detector to recover the data from the on/off shift keyed
modulated waveform. Data rates can be up to 19.2kbps. The AMIS-53000 has eight discrete data filters for common baud rates. The
receiver can detect either NRZ or Manchester encoded data.
1.4.2.2. Low Data Rate Frequency Shift Key Modulation
The AMIS-53000 uses a digital PLL detector to recover the data from the frequency shift keyed data below 20kbps. The recovered
data waveform is applied to the clock and data recovery circuit to produce the digital data and a synchronized clock. The receiver can
detect either NRZ or Manchester encoded data.
1.4.2.3. High Data Rate Frequency Shift Key Modulation
The AMIS-53000 uses a fast fourier transform (FFT) to recover data from frequency shift keyed modulated waveforms when the data
rate is higher than 20kbps. The data rate can be as high as 128kbps. The demodulated data waveform is applied to the clock and data
recovery circuit to produce the digital data and a synchronized clock. The receiver can detect either NRZ or Manchester encoded data.
1.4.2.4. Clock and Data Recovery
The AMIS-53000 uses a clock and data recovery circuit along with the frequency shift keyed or on/off shift keyed data detector circuits
to recover the data stream. The CDR circuit synchronizes a clock with the data rate of the received data. This same circuit can be
used with the on/off shift keyed waveform.
AMI Semiconductor – Aug. 05, Rev. 1.0
6
www.amis.com