UG-1828 Preliminary Technical Data
Rev. PrC | Page 20 of 338
ADRV9001 IN DMR TYPE PORTABLE RADIO APPLICATION
Figure 8. ADRV9001 in DMR Type Portable Radio Application
DMR Type Portable Radio Overview
With a minimum number of external components, the ADRV9001 transceiver can be used to build complete RF-to-bits signal chain that
can serve as RF front end in DMR type applications. For systems that demand superior LO phase noise performance, ADRV9001 allows
user to apply eternal RF LO. ADRV9001 internal AGC can be used to autonomously monitor and set the appropriate gain level for the Rx
signal chain. For time critical TDD type applications control of the ADRV9001 TRx can be done by toggling control lines. ADRV9001 can
control external Rx/Tx switch using its analog GPIOs as well as provide power amplifier bias voltage by utilizing AuxDAC outputs.
Table 6. Constrains and Limitations in DMR type Portable Radio Application
Functionality Constrains and Limitations
Rx Signal Path User have to ensure that appropriate level of isolation between Rx1 and Rx2 as well as Rx to Tx is provided at the
system level. In the previously described example, RxB input is used only during initialization calibrations. The LNA
connected to the Rx1A should be powered down during Tx slots to ensure proper operation of the Tx calibration path
(connected to the Rx1B). The user must ensure that appropriate attenuation is present in the line to prevent Rx being
overloaded by Tx signal.
LO Generation In Portable Radio, DMR type application, ADRV9001 can use its internal LO to generate RF LO1 for both uplink and
downlink. For applications with stringent RF LO requirements, the user can use external LO inputs. External LO1
operating at 2× RF LO can be used for both uplink and downlink.
RF Front End For LO generation, the ADRV9001 uses internal VCO that generates a square wave type signal. A square wave LO
would produce harmonics. For example: depending of RF matching used on the RF ports user 2nd LO harmonic can
be as high as −50 dBc and 3rd harmonic can be as high as −9 dBc. Therefore, the RF filtering on the Rx and Tx path
SPI
RESET
DEV_CLKL_OUT
MCS
DEV_CLK
DGPIOs
Rx/Tx_ENABLE
GP_INT
BPF FILTER
LNA
ATTENUATOR
RF SWITCH
COUPLER
ANTENNA
VCXO
BALUN
BALUN
BALUN
BALUN
POWER IC
BALUN
BALUN
/2
SSI
DAC
VGA
PA
LPF
FUNCTIONALITY
RF RECEPTION
USED BY Tx INIT CALIBRATIONS
RF TRANSMISSION
RF I/O
Rx1A
Rx1B
Tx1
ADRV9001
FPGA
OR
BBIC
VDDA_1P0
VDDA_1P3
VDDA_1P8
VDD_1P0
VDD_1P8
RF PLL2
RF PLL1
/2
EXT LO2
EXT LO1
Tx1
Rx1A
Rx1B
INT
QEC
LOL
Tx1
DATA
ADC
DDC
DEC
QEC
DC
SSI
Rx1
DATA
AuxDAC
AuxADCAGPIOs
3/4/6/7/8/10
3/6/8
14/16
2
3/4
TEMPER
ATURE
SENSOR
EXTERNAL
LO SOURCE
24159-008
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