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PDF RF2958 Data sheet ( Hoja de datos )

Número de pieza RF2958
Descripción 2.4GHz SPREAD-SPECTRUM TRANSCEIVER
Fabricantes RF Micro Devices 
Logotipo RF Micro Devices Logotipo



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Typical Applications
• IEEE 802.11b WLANs
• Wireless Residential Gateways
• Secure Communication Links
RF2958
2.4GHz SPREAD-SPECTRUM TRANSCEIVER
• High Speed Digital Links
• Wireless Security
• Digital Cordless Telephones
Product Description
The RF2958 is a single-chip transceiver specifically
designed for IEEE 802.11b applications. The part
includes all required transceiver functions. The receiver
includes: an LNA and downconverter; complete synthe-
sizers and VCO’s; direct conversion from IF receiver with
variable gain control; quadrature demodulator; I/Q base-
band amplifiers; and, on-chip baseband filters. For the
transmit side, a QPSK modulator and upconverter are
provided along with the synthesizer, VCO, and PA driver.
A minimum number of external components are required,
resulting in an ultra-compact low-cost radio design. Two-
cell or regulated three-cell (3.6V maximum) battery appli-
cations are supported by the part. The RF2958 is also
part of a 2.4GHz chipset along with our high-efficiency
GaAs HBT PA and the RF3002 Baseband Processor.
5.000
± 0.050
0.900
± 0.070
3.400
5.000
± 0.050 Shaded lead is pin 1.
Dimensions in mm.
0.400
± 0.050 TYP
3.400
-C-
SEATING
PLANE
SCALE:
NONE
0.500
TYP
0.100 M C
0.025
± 0.010
0.080 C
Optimum Technology Matching® Applied
Si BJT
GaAs HBT
GaAs MESFET
Si Bi-CMOS
www.DataShIeneGt4aUP./cHoBmT
SiGe HBT
Si CMOS
9GaN HEMT
SiGe Bi-CMOS
32 31
30 29 28 27 26 25
IF IN+ 1
IF IN- 2
3rd Order
Bes LPF
3rd Order
Bes LPF
3rd Order
Bes LPF
3rd Order
Bes LPF
IF Synth Analog
RF PLL
Voltage
Regulator
VCC IF 3
RX IF
Voltage
Regulator 1
RX IF
Voltage
Regulator 2
R BIAS 4
VCC RF2 5
D/A MUX
VCC RF1 6
IF OUT- 7
LC Trap
IF OUT+ 8
9 10
11 12
13
SPI Serial Port
Frac-N Digital
P&R
Digital
Voltage
Regulator
RF Synth Analog
RF PLL
Voltage
Regulator
14 15 16
24 VREF
23 DIG REG
22 VCC PLL4
21 SCLK
20 SSB
19 SDI
18 MCLK
17 MODE0
Functional Block Diagram
Package Style: QFN, 32-Pin, 5x5
Features
• Complete IEEE802.11b Transceiver
including VCOs
• Small 32-pin Leadless Package
• Minimal External Components Required
• Low Receive Current
• High Performance Super-het Architecture
Ordering Information
RF2958
RF2958TR13
RF2958 PCBA
2.4GHz Spread-Spectrum Transceiver
2.4GHz Spread-Spectrum Transceiver (Tape & Reel)
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
Rev A0 050209
11-263

1 page




RF2958 pdf
Digital Timing Specifications
SSB
TCS
TCWH
SCLK
SDI
MSB
TSU
Internal Recal pulse
TCWL
THLD
RF2958
LSB
TRC
www.DataSheet4U.com
Rev A0 050209
11-267

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RF2958 arduino
RF2958
IF/Baseband
The filtered IF signal is processed through a variable gain amplifier controlled through the RX VGC pin. The IF signal is
then downconverted to baseband I and Q signals, which are then filtered on-chip with third order Bessel filters. The
IF-to-baseband conversion gain range is 4dB to 72dB depending on the voltage present on the RX VGC pin. The gain
slope is negative over a range of 1.2V to 2.0V.
The single-ended I and Q outputs should be DC-coupled to the baseband processor. The DC reference voltage should
be provided to the baseband processor through the VREF pin to eliminate the potential for a signal blocker at DC.
TRANSMITTER
The I and Q inputs are differential. To use single-ended inputs, place 0.01µF capacitors at the I BYP and Q BYP pins.
The inputs should be DC-coupled from the baseband processor. In order to improve carrier suppression at RF, the DC
reference voltage should be provided to the baseband processor through the VREF pin. The baseband input signals are
filtered on-chip using third order Bessel filters for spectral shaping. The signals are then complex upconverted to IF. The
IF mixer output is amplified and connected to the IF OUT pins as a differential signal for connecting to the external SAW
filter as described above.
The differential signal from the SAW filter is then amplified using a variable gain amplifier. The gain of this amplifier can
be controlled either through the analog TX VGC pin or digitally from the baseband processor or MAC, depending on
application. The signal is then upconverted to the desired RF output frequency and amplified to a level appropriate to
drive a PA to the desired output level at the antenna.
In order to further extend battery life, the TX VGC pin can be used to control the bias of the external PA. If the user of the
end-product determines that he/she does not require full output power, the PA bias and the gain of the IF variable gain
amplifier can be controlled by the RF2958 to reduce the current consumption of the PA, thereby increasing battery life.
Contact RFMD Applications Engineering for guidance on implementing this feature.
DUAL FREQUENCY SYNTHESIZER
IF LO PLL
The IF PLL is an integer-N PLL nominally programmed to a center frequency of 748MHz. This frequency is divided by
two at the IF converter. A 44MHz oscillator is required to provide the PLL reference frequency through the MCLK pin.
See the Register Details and Serial Data Interface sections for details on programming.
www.DataRSFheLeOt4UP.LcoLm
The RF LO PLL is a fractional-N PLL programmed to an appropriate frequency to convert the 374MHz IF to the desired
RF channel. The nominal step size is 22MHz with a fractional modulus of 224. The 44MHz reference frequency is divided
to the appropriate step size. See the Register Details and Serial Data Interface sections for details on programming.
Note: To ensure proper operation of the PLLs, program Register 12 [17:16] to ‘11b’. All other bits in Register 12 should
be set to ‘0’.
Rev A0 050209
11-273

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