Frequency Deviation Output Mode - Analog Devices ADRV9001 User Manual

Preliminary Technical Data
rxnb_dem
I I
SIGNAL
DECIMATION
DDS
FILTERS FIFO
COS
Q
Q
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 133 ADRV9001 Rx narrowband demodulator contains a frequency
discriminator hardware block. Cooperating with other hardware blocks, for example, the CFC/DDC, and programmable FIR filters, etc.,
ADRV9001 Rx narrowband demodulator can perform FSK and FM demodulation under the control of the BBIC.
rxnb_dem
I I
SIGNAL
DECIMATION
DDS
FILTERS FIFO
COS
Q
Q
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
Regarding to each standard at above, Table 67 lists the usage suggestion of each modules in the Frequency Deviation Output mode.
Table 67. Suggestion of rxnbdem Usages in the Frequency Deviation Output Mode
FM, 12.5KHz
Input Sampling Clock
Signal FIFO
CFC/DDC
Rx Prog. FIR
Freq. Discriminator
NB Prog. FIR Low-pass filtering for smoothing the output FD signal
Resampler
Contact an Analog Devices Application Engineer for the specific filter profiles of Rx Programmable FIR and NB Programmable FIR.
Rx
PROGRAMMABLE
FIR
I
SIN
Q
Rx
PROGRAMMABLE
FIR
Figure 132. Rxnbdem in Normal IQ output mode
Rx
PROGRAMMABLE
FIR
I
SIN
Q
Rx
PROGRAMMABLE
FIR
Figure 133. Rxnbdem in Frequency Deviation Output mode
FM, 20KHz
24 KHz or 48 kHz
Enabled for channel filtering with 2 sets of FIR profiles
NB
I
PROGRAMMABLE
FIR
FREQUENCY
DISCRIMINATOR
NB
PROGRAMMABLE
Q
FIR
NB
FD
PROGRAMMABLE
FIR
FREQUENCY
DISCRIMINATOR
NB
PROGRAMMABLE
Mag
FIR
FM, 25KHz
48 KHz
Optional
Enable for manual control
Enabled with D = 1
Disable
Rev. PrA | Page 153 of 253
I
RESAMPLER
ROUND
RESAMPLER
Q
FD
RESAMPLER
ROUND
RESAMPLER
Mag
P25 I, 12.5KHz
24 KHz or 48 KHz
Pulse Shaping
Enable for manual control
UG-1828
I
Rx SSI
INTERFACE
Q
FD
Rx SSI
INTERFACE
Q
DMR,
12.5KHz