HFA3861A データシートの表示（PDF） - Intersil
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HFA3861A Datasheet PDF : 37 Pages
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HFA3861A
MODE
STANDBY
RX_PE
Inactive
TX_PE
Inactive
TX
Inactive Active
RX
Active Inactive
NO CLOCK
ICC Standby
RESET
Inactive
Inactive
Inactive
Active
TABLE 2. POWER DOWN MODES
AT
44MHz
DEVICE STATE
1.5mA Both transmit and receive operations disabled. Device will resume its operational
state within 1µs of RX_PE or TX_PE going active.
15mA Receiver operations disabled. Receiver will return in its operational state within 1µs
of RX_PE going active.
50mA Transmitter operations disabled. Transmitter will return to its operational state within
2 MCLKs of TX_PE going active.
300µA All inputs at VCC or GND.
DATA
MODULATION
DBPSK
DQPSK
CCK
CCK
TABLE 3. BIT RATE TABLE EXAMPLES FOR MCLK = 44MHz
A/D SAMPLE CLOCK
(MHz)
TX SETUP CR 5
BITS 1, 0
RX SIGNAL CR 63
BITS 7, 6
DATA RATE (Mbps)
22
00
00
1
22
01
01
2
22
10
10
5.5
22
11
11
11
SYMBOL RATE
(MSPS)
1
1
1.375
1.375
DATA
802.11 DSSS BPSK
1Mbps
BARKER
IOUT
QOUT
CHIP
RATE
SYMBOL
RATE
1 BIT ENCODED TO
ONE OF 2 CODE
WORDS
(TRUE-INVERSE)
11 CHIPS
11 MC/S
1 MS/S
802.11 DSSS QPSK
2Mbps
BARKER
2 BITS ENCODED
TO ONE OF
4 CODE WORDS
11 CHIPS
11 MC/S
1 MS/S
5.5Mbps CCK
COMPLEX
SPREAD FUNCTIONS
11Mbps CCK
COMPLEX
SPREAD FUNCTIONS
4 BITS ENCODED
TO ONE OF 16
COMPLEX CCK
CODE WORDS
8 BITS ENCODED
TO ONE OF 256
COMPLEX CCK
CODE WORDS
8 CHIPS
11 MC/S
1.375 MS/S
8 CHIPS
11 MC/S
1.375 MS/S
I vs Q
FIGURE 7. MODULATION MODES
For the 1 and 2Mbps modes, the transmitter accepts data
from the external source, scrambles it, differentially encodes
it as either DBPSK or DQPSK, and spreads it with the BPSK
PN sequence. The baseband digital signals are then output
to the external IF modulator.
9
For the CCK modes, the transmitter inputs the data and
partitions it into nibbles (4 bits) or bytes (8 bits). At 5.5Mbps,
it uses two of those bits to select one of 4 complex spread
sequences from a table of CCK sequences and then QPSK
modulates that symbol with the remaining 2 bits. Thus, there
are 4 possible spread sequences to send at four possible
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