Preliminary Technical Data
UG-1828
Rev. PrC | Page 117 of 338
Note for the current release PLL retune time is still being characterized. This information will be updated in future releases.
Figure 118. PLL Retune
Table 43. PLL Retune Time (Limited Testing, as PLL Characterization is Still Ongoing)
Device Clock (MHz)
PLL Retune Time (µs)
Fast
Normal
30
91
394
38.4
77
353
50
56
195
100
27
185
150
21
180
200
20
176
245.76
17
172
300
15
165
ADDITIONAL FREQUENCY HOPPING OPERATIONS
Rx Only with Long Propagation Delay
The ADRV9001 supports the scenario when Rx propagation delay is greater than the duration of a hop frame. This however is only
supported with Rx only modes. Tx only mode is described in the next section.
To achieve this, set the timing parameter, enableHoldDelay, to the propagation delay to keep the Rx datapath and interface alive after the
frame, or series of frames, on air has ended.
Figure 119. Rx Only with Long Propagation Delay
Tx Only with Long Propagation Delay
The ADRV9001 also supports Tx only case where the propagation delay is greater than the duration of a hop frame.
To achieve this, the user can specify a parameter as a part of the frequency hopping configuration, to delay the powering up of the Tx
delay the powering up of the Tx analog, in terms of hop frames. The user can then time the enabling of the interface, along with the using
the txRiseToAnalogOn timing parameters, to fine tune the delay.
The delay parameter specifies the delay in terms of hop frames after the first Tx setup rising edge has been received. By design, the
ADRV9001 enforces a minimum delay for both Tx and Rx of 1. However, for Tx only, this delay can be greater than 1. If the user sets it to
0, the ADRV9001 defaults the delay to 1.
24159-
494
t
pllRetune
t
chRiseToAnaOn
DWELL
TRANSITION
PIN: HOP
CHANNEL
ANALOG POWER
24159-
495
Rx
Rx
Rx
Rx
FRAMING ON AIR
FRAMING AT BBIC
PIN: HOP
PIN: Rx SETUP
Rx INTERFACE
Rx ANALOG POWER
Rx ON: LNA POWER OUT
t
RxPD
t
RxEnaHold
DWELL
DWELL
DWELL
DWELL
DWELL
TRANSITION
TRANSITION
TRANSITION
TRANSITION
