AMIS-53050 Datasheet, PDF (55/107 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53050 Frequency Agile Transceiver
Data Sheet
LO Frequency: A sub-sampling LO frequency architecture is implemented that down converts the incoming RF signal to the IF
frequency of about 500kHz. The LO frequency is produced from the internal VCO frequency. The frequency design of the LO signal
reduces the power consumption of the AMIS-53050 and simplifies the receiver, achieving reliable, quadrature LO signal generation.
IF Topology: The receiver implements a quadrature down-conversion architecture improving image rejection and creating the signals
required for the complex FFT FSK signal detection. The receiver uses this quadrature down-conversion and a combination of passive
and active poly-phase filtering to provide image suppression.
Sniff Signal Acquisition: As with earlier ASTRIC devices, the AMIS-53050 can reduce the receiver power requirements by
implementing the Sniff Mode for RF signal detection. Sniff mode is a method using the Quick Start oscillator to quickly wake the
receiver, check for signal energy and return to sleep or start the receive function. The Quick Start can start the receiver crystal oscillator
in as little as 10 micro-seconds. Using this fast start time, the sniff mode can turn on the receiver, check for signal energy and return to
sleep in as little as 130 micro-seconds. More information about this sniff mode is in Section 6.7.2.
Table 31: Receive Command
Register
Number (HEX) Name
0X00
Command
0X10
Idle config
Code
0X01
0X03
Bit 0
Function
Instruction to place the AMIS-53050 into receive
(remember that all parameters for receive must be set before issuing
this command)
Instruction to set the AMIS-53050 into the Idle Mode
Enable sniff function when in Idle Mode
Register descriptions:
RX Config- Options for the receiver must be set.
RF Frequency- The RF frequency of the receiver must be configured. (See Section 6.4.1.1)
6.5.1.1. RX Configuration
AMI Semiconductor – Jan. 07, M-20639-002
www.amis.com
Figure 36: Receiver Timing Chart
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