PT8R1002 Datasheet, PDF (10/26 Pages) List of Unclassifed Manufacturers – CMOS Zero-IF Radio Transceiver IC for Bluetooth

Preliminary Data Sheet
PT8R1002 CMOS Zero-IF
Radio Transceiver IC for Bluetooth
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Receive operation in Unidirectional interface
The primary signal for data reception is RXACTIVE signal.
When RXACTIVE goes to high, the RF circuitry starts to oper-
ate and send data after fixed time from RXACTIVE. The
baseband receives data and searches for the access code. Dur-
ing receive mode, DATACLK is sent from PT8R1002 to
baseband as a timing reference. The PT8R1002 circuit sends
the data to baseband at the rising edge of DATACLK, where the
baseband latches the data at the falling edge of DATACLK.
Prior to receiving information over air, the baseband transfers
control information including the hop frequency over the JTAG
interfaces, and enters PT8R1002 into search access code state
after fixed time to turn on receiver circuitry by driving
RXACTIVE HIGH. In the search access code state, the baseband
performs all of the tasks required to correlate with the access
code from the receive data. When the baseband has correlated
the access code, then it drives SYNCDETECT HIGH and makes
PT8R1002 enter into receive payload state. During the pay-
load, PT8R1002 eliminates any frequency offset between lo-
cal and remote Bluetooth devices based on its measurement
during syncword acquisition. PT8R1002 transmits demodu-
lated data to the baseband at half frequency of DATACLK,
which can be read by the baseband using appropriate timing
recovery algorithm. The unidirectional interface is returns to
the idle state with the baseband driving RXACTIVE LOW after
a fixed interval of T .
RxOff
Figure 10. Receiver procedure timing-diagram in unidirectional interface
JTAG
Programming
TXACTIVE
TXDATA_EN
TXDATA
RXACTIVE
SYNCDETECT
RXDATA
DATACLK
Idle
VCO Tuning
HOP CMD
t_TuningRX
Rx-On
Search
Access Code
t_RxOn
t_AccessCode
Rx-Burst
Valid Rx Data
Idle
t_RxOff
Figure 11. Receiver signal timing diagram in unidirectional interface
DATACLK(13MHz,O)
TXACTIVE(I)
TXDATA_EN(I)
TXDATA(I)
RXACTIVE(I)
SYNCDETECT(I)
RXDATA(O)
t_RxOn
PT0124(12/04)
PE SYNC WORD TE
PE : Preamble
TE : Trailer
t_RxOff
HEADER+PAYLOAD
10
Ver:2