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參數(shù)資料
| 型號： | PT8R1002 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CMOS Zero-IF Radio Transceiver IC for Bluetooth |
| 中文描述： | 的CMOS零中頻無線電收發(fā)器IC，藍(lán)牙 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 516K |
| 代理商： | PT8R1002 |
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Preliminary Data Sheet
PT8R1002 CMOS Zero-IF
Radio Transceiver IC for Bluetooth
PT0124(12/04)
Ver:2
9
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Transmit operation in Bidirectional interface
Unlike unidirectional interface, the primary procedure for data
transmit is to activate internal TXACTIVE signal by writing
HIGH
to TXA field of BT_RF_PLL_CTRL1 through DBUS
interface. The actual transmission starts after
HIGH
value of
SYNCDETECT 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, where the PT8R1002 latches
the data at the rising edge of DATACLK. The PT8R1002 tran-
sitions from the
idle state
when the baseband writes
HIGH
to
TXA field of BT_RF_PLL_CTRL1 through DBUS interface.
Figure 8. Transmit signal timing diagram in bidirectional interface
Updating
HIGH
to that field enables all the transmit circuitry
except for the final output stage. DBUS writing is executed at
a time T
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
SYNCDETCT
HIGH
, which enables the PA stage, and causes
the bidirectional 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, baseband
should write
LOW
to TXA field of BT_RF_PLL_CTRL1 to
disable the PA stage and return to the
idle state
.
Idle
VCO Tuning
Tx-Ramp-Up
Tx-Burst
Tx-Ramp-Down
Idle
DBUS
Programming
SYNCDETECT
TXDATA
DATACLK
HOP CMD
Tx DATA
t
TuningTX
t
Ramp-Up
t
Ramp-Down
TXACTIVE On CMD
TXACTIVE Off CMD
DATACLK(13MHz,O)
DSUB SPI
SYNCDETECT(I)
TXDATA(I)
PE
SYNC WORD TE
HEDER+PAYLOAD
PE
SYNC WORD
t
Ramp-Up
t
Ramp-Down
PE : Preamble
TE : Trailer
TXACTIVE On
CMD write
TXACTIVE Off
CMD write
Figure 9. Transmit signal timing diagram in bidirectional interface
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