HFA3861 データシートの表示（PDF） - Intersil
部品番号
コンポーネント説明
一致するリスト
HFA3861 Datasheet PDF : 35 Pages
| |||
IREF (21)
VREF (16)
TX_AGC_IN (18)
TX_IF_AGC (35)
SPARE (39)
ANTSEL (40)
VDD (ANALOG)
(12, 17, 22, 31)
HFA3861
GND (ANALOG)
(9, 15, 20, 25, 28)
VDD (DIGITAL)
(2, 8, 37, 41, 57)
GND (DIGITAL)
(1, 7, 36, 43, 56)
6-BIT
ADC
6-BIT
DAC
TX AGC
CONTROL
REGISTER
TRANSMIT
FILTER
DAC
DAC
PREAMBLE/HEADER
CRC-16
GENERATOR
MODULATOR,
BARKER/CCK
TX_DATA
SCRAMBLER
(52) RXCLK
(60) CCA
TXI (23, 24)
TXQ (29, 30)
(59) TX_RDY
(55) TXCLK
(58) TXD
TIMING
GENERATOR
MCLK
(62) TX_PE
(42)
MCLK
TX
STATE
CONTROL
TEST PORT
(3) SD
(4) SCLK
(64) SDI
(5) R/W
(6) CS
(44) (45) (46) (47) (48) (49) (50) (51)
FIGURE 11. DSSS BASEBAND PROCESSOR, TRANSMIT SECTION
PN Correlators Description
There are two types of correlators in the HFA3861 baseband
processor. The first is a parallel matched correlator that
correlates for the Barker sequence used in preamble,
header, and PSK data modes. This PN correlator is
designed to handle BPSK spreading with carrier offsets up
to ±50ppm and 11 chips per symbol. Since the spreading is
BPSK, the correlator is implemented with two real
correlators, one for the I and one for the Q Channel. The
same Barker sequence is always used for both I and Q
correlators.
16
These correlators are time invariant matched filters otherwise
known as parallel correlators. They use one sample per chip for
correlation although two samples per chip are processed. The
correlator despreads the samples from the chip rate back to the
original data rate giving 10.4dB processing gain for 11 chips per
bit. While despreading the desired signal, the correlator
spreads the energy of any non correlating interfering signal.
The second form of correlator is the correlator function used
for detection of the CCK modulation. For the CCK modes,
Share Link: 