PT8R1002 Datasheet, PDF (8/26 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
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Transmit operation in Unidirectional interface
The primary signal for data transmit is TXACTIVE signal. The
actual data transmission starts after TXDATA_EN provided by
baseband. During transmit mode, DATACLK is sent from
PT8R1002 to baseband as a timing reference. The baseband
circuit transmits data to the PT8R1002 at the falling edge of
DATACLK, whereas the PT8R1002 latches the data at the ris-
ing edge of DATACLK. The state of PT8R1002 transitions
from the idle state when the baseband drives TXACTIVE HIGH.
TXACTIVE enables all the transmit circuitry except for the
final output stage. TXACTIVE is driven high at a time T
TuningTX
before the hop frequency synthesizer has settled to allow any
frequency offsets caused by the TX circuitry to be eliminated.
Either when, or just before, the TX circuitry has correctly settled
on frequency, the baseband drives TXDATA_EN HIGH, which
enables the PA stage, and causes the unidirectional interface
to enter the transmit data state. The baseband drives data to
the PT8R1002 on the falling edge of DATACLK, and the
PT8R1002 reads the transmit data on the rising edge. When all
the data has been transmitted, the baseband drives TXDATA_EN
and TXACTIVE LOW to disable the PA stage and return to the
idle state.
Figure 6. Transmit procedure timing diagram in unidirectional interface
JTAG
Programming
TXACTIVE
TXDATA_EN
TXDATA
RXACTIVE
SYNCDETECT
RXDATA
DATACLK
Idle
VCO Tuning
Tx-Ramp-Up
HOP CMD
t_TuningTX
t_Ramp-Up
Tx-Burst
Tx DATA
Figure 7. Transmit signal timing diagram in unidirectional interface
Tx-Ramp-Down
Idle
t_Ramp-Down
DATACLK(13MHz,O)
TXACTIVE(I)
TXDATA_EN(I)
TXDATA(I)
RXACTIVE(I)
SYNCDETECT(I)
RXDATA(O)
t_Ramp-Up
PE
SYNC WORD
PE SYNC WORD TE HEDER+PAYLOAD
PE : Preamble
TE : Trailer
t_Ramp-Down
PT0124(12/04)
8
Ver:2