EVAL-ADF7021-VDB2Z Analog Devices Inc, EVAL-ADF7021-VDB2Z Datasheet - Page 40

• Manufacturer Part Number: EVAL-ADF7021-VDB2Z
• Description: 868 - 870MHz - EVALUATION BOARD
• Manufacturer: Analog Devices Inc
• Type: Transceiverr

Specifications of EVAL-ADF7021-VDB2Z

• Frequency: 868MHz ~ 870MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADF7021
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADF7021-V
The recommended programming sequences for transmit and
receive are shown in Figure 54 and Figure 55, respectively.
WAIT 50µs (REGULATOR POWER-UP)
CHECK FOR REGULATOR READY
OPTIONAL. ONLY NECESSARY IF PA
RAMP-DOWN IS REQUIRED.
CE HIGH
REFERENCE
TCXO
WAIT FOR PA TO RAMP UP (ONLY IF PA RAMP ENABLED)
WRITE TO REGISTER 3 (TURNS ON Tx/Rx CLOCKS)
Figure 54. Power-Up Sequence for Transmit Mode
WAIT FOR Tx LATENCY NUMBER OF BITS
WRITE TO REGISTER 0 (TURNS ON PLL)
WRITE TO REGISTER 2 (TURNS OFF PA)
WRITE TO REGISTER 2 (TURNS ON PA)
WAIT 40µs (TYPICAL PLL SETTLING)
TURN ON EXTERNAL VCO AND
ALLOW ADEQUATE SETTLING
WAIT FOR PA TO RAMP DOWN
WRITE TO REGISTER 1
(REFER TO TABLE 11)
Rev. 0 | Page 40 of 60
POWER-DOWN
POWER-DOWN
Tx MODE
CE LOW
CE LOW
The difference in the power-up routine for a TCXO and XTAL
reference is shown in these figures.
(REGULATOR POWER-UP + TYPICAL XTAL SETTLING)
REFERENCE
XTAL
CHECK FOR REGULATOR READY
WAIT 50µs + 1ms
CE HIGH