AMIS-53000 Datasheet, PDF (71/99 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53000 Frequency Agile Transceiver
Data Sheet
Table 74: RF PLL Trim - 0X27 [39]
Bit Name
State
7
111
TX Mode PLL
--
6:4 _{Trim Value}
000
3
111
RX Mode PLL
--
2:0 Trim Value
000
Comment
Max VCO trim value from the self calibration
Min VCO trim value from the self calibration
Max VCO trim value from the self calibration
Min VCO trim value from the self calibration
6.10.1.8. PLL Target Value
This register is used by the AMIS-53000 during self calibration. This is an internal use register with no user defined meaning.
6.10.2. Calibrate Quick Start Oscillator
The Quick Start oscillator must be calibrated prior to operations such as Sniff or Burst transmit. This command will perform an internal
calibration of the oscillator, write the result to the Quick Start trim register, issue a calibration complete flag, as well as a calibration
good/bad indicator. This command can be issued from any valid state that accepts changes in the instructions.
6.10.3. Calibrate 10kHz Oscillator
In any of the idle modes of operation, an internal 10kHz oscillator is used as the timekeeping reference for the interval timers. The
calibrate 10kHz oscillator command will enable the crystal oscillator to create an accurate time base to use for the calibration of this
oscillator, and then perform the calibration and store the result. A Cal done and status flag will be issued upon completion of the
calibration. This command can be issued from any valid state that accepts changes in the instructions.
6.10.4. Calibrate PLL
Calibrate the PLL performs a calibration for the PLL in both transmit and receive mode. The PLL status register reports the calibration
value for both modes, as well as the status for the calibration. This command can be issued from any valid state that accepts changes
in the instructions.
6.10.5. Calibrate LNA
This command turns on the RF receiver chain and optimizes both the LNA output tuning structure and the LNA input matching trim for
maximum signal level on RSSI. This is a calibration typically performed at board assembly in the presence of a known RF signal. The
AMIS-53000 will auto-tune both the input and output internal variable capacitances of the LNA to optimize gain, compensating for the
tolerance of external components for the match.
6.11 ROM 2 REGS
This command starts internal AMIS-53000 processes such as:
Multi-Channel: Calculates the frequency information to form nine channels of 300kHz bandwidth. Four of these channels
are at higher frequencies than the programmed RF frequency and four channels are at lower frequencies.
Wave Shaping: Calculates the voltage steps to form the Gaussian wave shaping of the data for the data rate selected.
AMI Semiconductor – Aug. 05, Rev. 1.0
71
www.amis.com