AMIS-53050 Datasheet, PDF (66/107 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53050 Frequency Agile Transceiver
Data Sheet
Table 46: Output Power - 0X18 [24]
Bit Name
Comment
7
C_POWER
Coarse output power selection sent to PA
6:0 _{F_POWER [6:0]}
Fine output power control (upper 7 bits of the DAC, LSB of DAC=0)
6.6.3. Preamble Length
This byte is used to define the length of preamble to send prior to data in both transmit and burst mode transmit.
Table 47: Preamble Length - 0X1A [26]
Bit Name
Comment
7
PreambleLen [7:0] ^{Length, in bit times, of CW (AM), or ’10 (FM) sent prior to preamble in burst}
Table 48: Suggested Preambles
Modulation
Preamble
Comment
AM NRZ with CDR
CW
AM Manchester with CDR _CW
SOF required and suggested as 0X55¹
SOF required and suggested as 0x0A²
FM FFT
1/0 pattern
No SOF is required
FM PLL
(NRZ)
1/0 pattern
No SOF is required
FM PLL (Manchester)
All 1s or 0s
SOF is required and suggested to be 55(Hex) or AA(Hex)³
Notes:
1.
2.
When using SOF with NRZ data, it is suggested that fast phase alignment is enabled, activity check is set to 8 or 16 and preamble length is 10 or 20 bit times.
When using SOF with Manchester coded data, it is suggested that fast phase alignment is enabled, activity check is set to 4 bit times and preamble length is set
long enough to trigger the activity check.
3. The length of this preamble is dependent on the loop bandwidth of the recovery clock PLL.
6.6.4. FM Transmit Data Shaping
The AMIS-53050 allows the user to enable data shaping of the data waveform to improve the RF spectral efficiency. When enabled,
the clock recovery NCO is used to provide an internal clock at 16 times the selected data rate. This clock is used to cycle through a pre-
defined pattern whenever a transition is detected on the TX input. The shaping pattern is Gaussian with a BT=1. The intermediate
values for the shaping are determined from the peak deviation register when an external host controller writes the ‘ROM 2 REGS’ to the
AMIS-53050 command register.
6.7 Idle
Table 49: Idle Command
Register
Number (HEX) Name
0X00
Command
Code
0X03
0X04
Function
Enable the idle state
Return to idle state
AMI Semiconductor – Jan. 07, M-20639-002
66
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