EVAL-ADF7021DBZ5 Datasheet, PDF (47/64 Pages) Analog Devices – High Performance Narrow-Band Transceiver IC

Data Sheet
REGISTER 0—N REGISTER
MUXOUT
8-BIT INTEGER_N
15-BIT FRACTIONAL_N
ADF7021
ADDRESS
BITS
TRANSMIT/
TR1 RECEIVE
0 TRANSMIT
1 RECEIVE
U1 UART MODE
0
DISABLED
1
ENABLED
M3 M2 M1 MUXOUT
0
0
0
REGULATOR_READY (DEFAULT)
0
0
1
FILTER_CAL_COMPLETE
0
1
0
DIGITAL_LOCK_DETECT
0
1
1
RSSI_READY
1
0
0
Tx_Rx
1
0
1
LOGIC_ZERO
1
1
0
TRISTATE
1
1
1
LOGIC_ONE
FRACTIONAL
M15 M14 M13 ... M3 M2 M1 DIVIDE RATIO
0
0
0
... 0
0
0
0
0
0
0
... 0
0
1
1
0
0
0
... 0
1
0
2
.
.
.
... .
.
.
.
.
.
.
... .
.
.
.
.
.
.
... .
.
.
.
1
1
1
... 1
0
0
32764
1
1
1
... 1
0
1
32765
1
1
1
... 1
1
0
32766
1
1
1
... 1
1
1
32767
N8 N7 N6 N5 N4 N3 N2 N1
0
0
0
1
0
1
1
1
0
0
0
1
1
0
0
0
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
1
1
1
1
1
0
1
N COUNTER
DIVIDE RATIO
23
24
.
.
.
253
1
1
1
1
1
1
1
0
254
1
1
1
1
1
1
1
1
255
Figure 62. Register 0—N Register Map
The RF output frequency is calculated by the following:
For the direct output
RF_OUT
=
PFD × _ Integer

_N
+
Fractional _ N
2¹⁵


For the RF_DIVIDE_BY_2 (DB18) selected
RF_OUT
=
PFD × 0.5× _ Integer _ N

+
Fractional _ N
2¹⁵


In UART/SPI mode, the TxRxCLK pin is used to input the Tx
data. The Rx Data is available on the TxRxDATA pin.
In the MUXOUT map in Figure 62, the FILTER_CAL_COMPLETE
indicates when a coarse or coarse plus fine IF filter calibration
has finished. The DIGITAL_LOCK_DETECT indicates when
the PLL has locked. The RSSI_READY indicates that the RSSI
signal has settled and an RSSI readback can be performed.
Tx_Rx gives the status of DB27 in this register, which can be
used to control an external Tx/Rx switch.
Rev. B | Page 47 of 64