Analog Devices ADRV9001 User Manual page 62

UG-1828
FRAMING ON AIR
FRAMING AT BBIC
PIN: TX_ENABLE
TX ANALOG POWER
TX ON: ANTENNA SWITCH
As shown in Figure 54, a transmit burst consists a series of valid transmit data with user's option of padding guard data at the beginning
and end of the valid data. Based on the timing parameters configured by user, it is user's decision if full or partial of the guard data
should be transmitted to the air and user's responsibility to make sure that the guard data usage is compliant with the standard
requirement. The transmit enable pin is controlled by user to signal the start and end of a transmit burst at the data port. Based on the
transmitter enable signal and a set of transmit timing parameters configured by user, ADRV9001 further controls the transmitter
interface, transmitter internal analog components, as well as the antenna switch (if it is controlled by ADRV9001 instead of user) to
make sure that the transmit burst is on air at deterministic time as desired by user.
Transmit timing parameters in Figure 54 can be categorized into three types: ADRV9001 parameter (ADRV9001 provides to user), user
parameter (user provides to ADRV9001), and helper parameters (determined by user which are not needed to provide to ADRV9001 but
could be utilized by the user to derive other required timing parameters). Table 21 further explains all these timing parameters. All
bounds specified in Table 21 are suggestions for optimal operation, no hardware or software restrictions prevent users from setting
values that are out of bounds. The maximum programmable parameter value is specified in later sections.
Table 21. Transmit Timing Parameters Description
Tx Timing Parameters
enableSetupDelay
(t )
TxEnaSetup
propagationDelay
(t )
TxPD
t
TxPD
t
TxGT
TX_INTERFACE
t
TxEnaRise2AnaOn
t
TxEnaSetup
t
TxEnaRise2On
t
TxPD
t
TxGT
USER PROVIDES ADRV9001
ADRV9001 PROVIDES USER
HELPER PARAMETERS
Figure 54. Transmitter Timing Parameters (t
Description
Time taken for ADRV9001 to
power up its analog front end.
This may or may not include
PLL tuning time based on the
use case. (For example, when
Tx and Rx shares the same IO
but at different frequency, PLL
tuning is needed at the frame
boundary.)
Delay from ADRV9001 digital
interface to antenna
TX
TX
VALID DATA
VALID DATA
t
TxEnaHold
> t
TxPD TxEnaSetup
Provided
By Bounds
ADRV9001 Min: N/A
Parameter Max: N/A
Helper Min: N/A
Parameter
Max: N/A
Rev. PrA | Page 62 of 253
Preliminary Technical Data
t
TxPD
t
TxPD
t
TxEnaFall2Off
)
Comments
No PLL retuning @ frame
boundary: 8 μs (analog power-up
time)
PLL tuning @frame boundary:
758 μs (Analog Power-Up time +
PLL Tuning time)
(The PLL tuning time 750 μs refers
to the case when internal LO is
used. When external LO is used,
users should calculate and use
their own PLL tuning time. Note
the time required for PLL tuning is
continuously improving in the
future.)
This parameter should be
measured by user and it is
dynamic profile dependent and
board layout dependent. It does
not need to be provided to
ADRV9001. It can be used to
derive other parameters required
by the ADRV9001.