EVAL-ADF7021DBZ5 Datasheet, PDF (14/64 Pages) Analog Devices – High Performance Narrow-Band Transceiver IC

ADF7021
Data Sheet
UART/SPI Mode
UART mode is enabled by setting R0_DB28 to 1. SPI mode is enabled by setting R0_DB28 to 1 and setting R15_DB[17:19] to 0x7.
The transmit/receive data clock is available on the CLKOUT pin.
t_BIT
CLKOUT
(TRANSMIT/RECEIVE DATA
CLOCK IN SPI MODE.
NOT USED IN UART MODE.)
TxRxCLK
(TRANSMIT DATA INPUT
IN UART/SPI MODE.)
FETCH SAMPLE
Tx BIT
Tx BIT
Tx BIT
Tx BIT
Tx BIT
TxRxDATA
(RECEIVE DATA OUTPUT
IN UART/SPI MODE.)
HIGH-Z
Tx/Rx MODE
CLKOUT
(TRANSMIT/RECEIVE DATA
CLOCK IN SPI MODE.
NOT USED IN UART MODE.)
TxRxCLK
(TRANSMIT DATA INPUT
IN UART/SPI MODE.)
TxRxDATA
(RECEIVE DATA OUTPUT
IN UART/SPI MODE.)
Tx/Rx MODE
Tx MODE
Figure 8. Transmit Timing Diagram in UART/SPI Mode
t_BIT
FETCH SAMPLE
HIGH-Z
Rx BIT
Rx BIT
Rx BIT
Rx BIT
Rx MODE
Figure 9. Receive Timing Diagram in UART/SPI Mode
Rx BIT
Rev. B | Page 14 of 64