AMIS-53000 Datasheet, PDF (7/99 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53000 Frequency Agile Transceiver
Data Sheet
1.4.2.5. Manchester Data Encoding
The AMIS-53000 can encode the data as NRZ or Manchester.
1.4.2.6. Oscillators
The AMIS-53000 requires a single external crystal working with the internal VCO and PLL to generate frequencies from 300MHz to
928MHz. The AMIS-53000 has internal capacitors that eliminate the need for external load capacitors when using a typical 24MHz
external crystal. The VCO requires an external inductor and capacitor (including internal capacitance) to produce the desired transmit
or receive RF frequency. The AMIS-53000 generates the desired RF transmit and receive frequencies from 300MHz to 928MHz by
selecting the proper inductor and capacitor value along with programming the frequency in the AMIS-53000. A patented Quick Start
circuit is used to force the crystal oscillator on to the desired frequency in microseconds rather than in milliseconds.
A low power internal 10kHz oscillator provides the timing for Sniff, Burst and housekeeping. The AMIS-53000 self-calibration circuits
can tune this oscillator to within two percent of 10kHz.
1.4.2.7. Interface Serial Bus
The AMIS-53000 has separate interfaces for data and control. The transfer of TX/RX data between the AMIS-53000 and an external
host/controller is done with a 3-wire serial interface or a 4-wire SPI compatible serial interface. Control information is written to the
AMIS-53000 registers or read from the AMIS-53000 registers using either a 3-wire serial interface or a 2-wire I²C compatible serial
interface.
Once the AMIS-53000 configuration registers have data written to them for various operational modes such as, TX, RX, Sniff or other,
placing the AMIS-53000 into one of these modes is accomplished through a single write to the command register.
TX/RX Data Interface
The transmit or receive data interface of the AMIS-53000 can be programmed to be either a proprietary 3-wire serial interface or a
4-wire SPI compatible serial bus. The data interface can be set up to do either data transfers into a buffer in the AMIS-53000 or
streaming data (data is transmitted as it is received by the AMIS-53000 or data is sent to the host/controller as it is recovered in the
AMIS-53000 receiver). When using the buffered data mode, the AMIS-53000 can be the master or slave, but it must be the master to
do streaming data.
Control Interface
Once the AMIS-53000 is first powered on, an external host/controller sets the type of interface to the AMIS-53000 (3-wire or I²C) by
simply writing to the AMIS-53000 with the desire protocol. The AMIS-53000 will continue to use that interface protocol until power is
removed from the AMIS-53000. The AMIS-53000 is always a slave device for the control interface.
AMI Semiconductor – Aug. 05, Rev. 1.0
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