EVAL-ADF7021-NDBEZ Analog Devices Inc, EVAL-ADF7021-NDBEZ Datasheet - Page 42

• Manufacturer Part Number: EVAL-ADF7021-NDBEZ
• Description: 426MHz To 429 MHz, External L
• Manufacturer: Analog Devices Inc
• Type: Transceiver, FSKr

Specifications of EVAL-ADF7021-NDBEZ

• Frequency: 420MHz ~ 440MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADF7021-N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q5835434A

ADF7021-N
PACKET STRUCTURE AND CODING
The suggested packet structure to use with the ADF7021-N is
shown in Figure 54.
Refer to the Receiver Setup section for information on the
required preamble structure and length for the various modulation
schemes.
PROGRAMMING AFTER INITIAL POWER-UP
Table 23 lists the minimum number of writes needed to set up
the ADF7021-N in either Tx or Rx mode after CE is brought
high. Additional registers can also be written to tailor the part
PREAMBLE
Figure 54. Typical Format of a Transmit Protocol
WORD
SYNC
FIELD
ID
DATA FIELD
CRC
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to a particular application, such as setting up sync byte
detection or enabling AFC. When going from Tx to Rx or vice
versa, the user needs to toggle the Tx/Rx bit and write only to
Register 0 to alter the LO by 100 kHz.
Table 23. Minimum Register Writes Required for Tx/Rx Setup
Mode
Tx
Rx
Tx to Rx and Rx to Tx
The recommended programming sequences for transmit and
receive are shown in Figure 55 and Figure 56, respectively. The
difference in the power-up routine for a TCXO and XTAL
reference is shown in these figures.
Reg 1
Reg 1
Reg 0
Reg 3
Reg 3
Registers
Reg 0
Reg 0
Reg 2
Reg 5
Reg 4