UG-1828 Preliminary Technical Data
Rev. PrB | Page 168 of 277
Note: The resampler configuration is not supported by current ADRV9001 software release yet.
Round Module
Round in rxnbdem is to map the ADRV9001 internal datapath bit-width to the Rx SSI output. This module cannot be bypassed.
The Round module outputs 16-bit I data and 16-bit Q data to the Rx SSI output. If required, the Round module can output 16-bit I data
to the Rx SSI output with the 16-bit output Q data set as ‘0’.
NORMAL IQ OUTPUT MODE
The Normal IQ Output mode is applicable for both wideband and narrow band as the frequency discriminator bypassed. Except the
Rounding, all other modules can be bypassed. See Figure 159 ADRV9001 Rx narrow-band demodulator can be the common output stage
of Rx channel.
RESAMPLER
NB
PROGRAMMABLE
FIR
NB
PROGRAMMABLE
FIR
Rx
PROGRAMMABLE
FIR
Rx
PROGRAMMABLE
FIR
FREQUENCY
DISCRIMINATOR
RESAMPLER
SIGNAL
FIFO
SIN
DDS
COS
DECIMATION
FILTERS
I
Q
I
Q
I
Q
I
Q
I
Q
I
Rx SSI
INTERFACE
Q
rxnb_dem
ROUND
24159-133
Figure 160. Rxnbdem in Normal IQ output mode
In the Normal IQ output mode, the rxnbdem can provide the signal processing resources as followed:
• a spur-free carrier frequency offset correction,
• a profile-switchable channel filter, and
• a precise IQ resampler (not supported by software yet).
All above resources can be manually enabled and controlled by the BBIC by API (will provide the support in the later software releases).
FREQUENCY DEVIATION OUTPUT MODE
The Frequency Deviation Output mode is only applicable for the narrowband modes. Except the Round and the Frequency
Discriminator, all other modules can be bypassed. See Figure 160. ADRV9001 Rx narrowband demodulator contains a frequency
discriminator hardware block. Cooperating with other hardware blocks, for example, the CFC/DDC, and programmable FIR filters, and
so on, ADRV9001 Rx narrowband demodulator can perform FSK and FM demodulation under the control of the BBIC.
RESAMPLER
NB
PROGRAMMABLE
FIR
NB
PROGRAMMABLE
FIR
Rx
PROGRAMMABLE
FIR
Rx
PROGRAMMABLE
FIR
FREQUENCY
DISCRIMINATOR
RESAMPLER
SIGNAL
FIFO
SIN
DDS
COS
DECIMATION
FILTERS
I
Q
I
Mag
FD
Mag
FD
Q
FD
Rx SSI
INTERFACE
Q
rxnb_dem
ROUND
I
Q
24159-134
Figure 161. Rxnbdem in Frequency Deviation Output mode
The FSK/FM demodulation can cover the standards listed as followed:
• Analog FM with 12.5 kHz channel bandwidth
• Analog FM with 20 kHz channel bandwidth
• Analog FM with 25 kHz channel bandwidth
• P25 Phase I with 12.5 kHz channel bandwidth
• DMR with 12.5 kHz channel bandwidth
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