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PDF RF3000 Data sheet ( Hoja de datos )
| Número de pieza | RF3000 | |
| Descripción | Spread Spectrum Baseband Modem | |
| Fabricantes | Micro Devices | |
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Hay una vista previa y un enlace de descarga de RF3000 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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Typical Applications
• IEEE802.11b Wireless LAN Systems
• ISM Band Systems
• Direct Sequence Systems
RF3000
SPREAD-SPECTRUM BASEBAND MODEM
• Wireless Modems
• Wireless Point-to-Point
Product Description
The RF3000 is a monolithic CMOS baseband processor.
It is suitable for use in 11Mbps IEEE802.11b wireless
LAN systems, and contains all functions required to con-
vert a spread-spectrum signal to bit stream. The on-chip
equalizer provides protection against multi-path in high
data rate modes. All functions are configurable via an SPI
port. A complete 2.4GHz radio reference design is avail-
able from RFMD.
-A-
4.00
3.80 0.30
0.20
0.25
0.10
10.00
9.80
0.64
8° MAX
0° MIN
6.20
5.80
1.27 0.25
0.40 0.19
1.75
1.35
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding mold flash.
3. Lead coplanarity - 0.10 with respect to datum "A".
Optimum Technology Matching® Applied
Si BJT
Si Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
9Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
RX VGC
ANT SEL
RXVGC
DAC
CCA
RX VGC
CCA
LNA GS
I IN
I IN
ADC
802.11
Preamble/
Header
VREF IN
Data Converter
Reference
RX DATA
Q IN
omTX VGC
u.cI OUT
eet4Q OUT
Q IN
ADC
TX VGC
DAC
I OUT
DAC
Q OUT
DAC
Control
Port
Mode Control
RX RDY
DATA CLK
SPI
TX RDY
802.11
Preamble/
Header
Tx Length
Tx Signal
Service
TX DATA
RX PE
TX PE
M CLK
tashFunctional Block Diagram
www.daRev A4 031216
Package Style: SSOP-28
Features
• On-Chip ADCs and DACs, RSSI, AGC
• BPSK/QPSK/CCK
• 250nS Delay Spread Equalizer
• Supports Antenna Diversity
• Reference Design Available
Ordering Information
RF3000
Spread-Spectrum Baseband Modem
RF3000 PCBA Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
11-321
1 page  
RF3000
Index
GENERAL DESCRIPTION
Figure 4. 2.4GHz IEEE802.11b Chipset Diagram
Figure 5. RF3000 Block Diagram
SPI CONTROL PORT
SPI Mode Description
SPI Mode Pin Definitions Table
SPI Method of Operation
Write
Read
SPI Operation Summary
Write
Read
SPI Mode Functional Timing Diagrams
Figure 6. SPI Write Functional Timing Diagram
Figure 7. SPI Read Functional Timing Diagram
METHOD OF OPERATION
IEEE802.11b Transmit Modes
IEEE802.11b DSSS Transmit Modes
IEEE802.11b DSSS Transmission Summary
Figure 8. IEEE802.11b Transmit Timing Overview
Figure 8a. Alternate Transmit Interface
IEEE802.11b Receive Mode
Diversity
Figure 9. Diversity and AGC Algorithm
AGC Algorithm
Figure 10. AGC Decision Structure
AGC Calibration
Figure 11. High Gain Mode (LNAGS=1) Plot of
RXVGC Showing Normal Operation and Calibration
Ranges
Figure 12. Low Gain Mode (LNAGS=0) Plot of
RXVGC Showing Normal Operation and Calibration
Ranges
High Gain Calibration Procedure
Low Gain Calibration Procedure
Post-AGC
IEEE802.11b DSSS Receive Summary
Figure 13. IEEE802.11b Receive Timing Overview
Figure 13a. Alternate Receiver Interface
BLOCK DIAGRAM BREAKOUT
Modulator
PSK Modes
CCK Mode
IEEE802.11b Preamble/Header Creation and
Assembly
Demodulator
PSK Modes
CCK Mode
IEEE802.11b Preamble/Header Detection and
Extraction
Data Converters
A/D Converters
D/A Converters
RSSI, CCA and AGC
Scramblers
Diversity
Equalizer
CONTROL PORT REGISTER DEFINITIONS FOR
RF3000
Register 0x0 - Reserved
Register 0x01 - Modem Control and RX Status
Mode 3-0 - TX Mode Table
Register 0x02 - CCA Control
CCA1, CCA0 - 802.11 CCA Mode Table
Register 0x03 - Diversity and RSSI Value
Register 0x04 - RX Signal Field
Register 0x05 - RX Length Field MSB’s
Register 0x06 - RX Length Field LSB’s
Register 0x07 - RX Service Field
Register 0x08 - Reserved
Register 0x09 - Reserved
Register 0x0A - Reserved
Register 0x0B - Reserved
Register 0x0C - Reserved
Register 0x0D - Reserved
Register 0x0E - Reserved
Register 0x0F - Reserved
Register 0x10 - Reserved
Register 0x11 - TX Variable Gain and TX Length Field
Extension
Scrambler Mode Table
Register 0x12 - TX Length Field MSB’s
Register 0x13 - TX Length Field LSB’s
Register 0x14 - Low Gain Calibration
Register 0x15 - High Gain Calibration
Register 0x16 - Reserved
Register 0x17 - Reserved
Register 0x18 - Reserved
Register 0x19 - Reserved
Register 0x1A - Reserved
Register 0x1B - Reserved
Register 0x1C - Options Register 1
Register 0x1D - Options Register 2
Register 0x1E - Reserved
Register 0x1F - Reserved
Rev A4 031216
11-325
5 Page 
RF3000
RF3000 Method of Operation
The transmitter power enable (TX PE) input enables the transmitter process. (Note: Transmit has priority over receive.)
When TX PE is high, the LNA GS signal will be driven low. The TX RDY output indicates the readiness of the RF3000 to
receive data for transmit. Transmitted data is passed into the RF3000 through the TXDATA input and clocked by the
DATA CLK output. The receiver power enable (RX PE) input enables the receiver, and the receive data ready (RX RDY)
signal indicates that received data is upcoming. The RF3000 generates the received data clocks, and outputs the
received data, through the RX DATA output. The receiver port also provides a clear channel assessment (CCA) to the
MAC.
The table below summarizes the operation of the chip. The user should note that RX PE must be High to perform CCA.
TX PE
0
0
1
1
RX PE
0
1
0
1
Operation
Standby mode.
RX is powered up. CCA circuity is active.
TX is powered up. Begin TX. CCA is inactive.
RESERVED
IEEE802.11b Transmit Modes
IEEE802.11b DSSS Transmit Modes
The RF3000 supports PSK and CCK DSSS modes defined in IEEE802.11b specification. The RF3000 also supports the
optional short preamble and header format as defined in IEEE802.11b.
The following section describes IEEE802.11b DSSS data transmission. The user must first prepare the applicable con-
trol port registers to determine the mode of operation and the transmission length. The mode of operation must be writ-
ten into Register 1, followed by setting the transmission length (in microseconds). The length is to be written into
Registers 17 (bit 0 only), 18 and 19. Mode byte values for IEEE802.11b modes are summarized below.
IEEE802.11 DSSS Mode
1Mbps DBPSK
2Mbps DQPSK Long preamble
2Mbps DQPSK Short preamble
5.5Mbps CCK Long preamble
5.5Mbps CCK Short preamble
11Mbps CCK Long preamble
11Mbps CCK Short preamble
Mode Byte Value
0 x 0016
0 x 2016
0 x 3016
0 x 4016
0 x 5016
0 x 6016
0 x 7016
Once the control port values are written, the RF3000 is ready to transmit data. Optionally, the TX length value can be
written during the 128µS of preamble. When the user is ready to transmit, TX PE is driven High. This signals the RF3000
to assemble and transmit the 802.11 preamble and header, as described below.
Preamble
128 1’s
SFD
(16-bits)
Service
(8-bits)
Header
Signal
(8-bits)
Length
(16-bits)
CRC
(16-bits)
Data
Data
(x-bits)
The preamble and header for 1Mbps mode is always transmitted as 1Mbps BPSK. However for 2Mbps, 5.5Mbps and
11Mbps modes, IEEE802.11b allows a short preamble, which has the preamble, transmitted as 1Mbps BPSK and the
header transmitted as 2Mbps QPSK. The usage of the optional short preamble is selected when the transmission mode
is written to the control port.
Rev A4 031216
11-331
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet RF3000.PDF ] | |
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