DataSheet.es    


PDF RFFC5071A Data sheet ( Hoja de datos )

Número de pieza RFFC5071A
Descripción WIDEBAND SYNTHESIZER/VCO
Fabricantes RF Micro Devices 
Logotipo RF Micro Devices Logotipo



Hay una vista previa y un enlace de descarga de RFFC5071A (archivo pdf) en la parte inferior de esta página.


Total 26 Páginas

No Preview Available ! RFFC5071A Hoja de datos, Descripción, Manual

RFFC5071A/2A
WIDEBAND SYNTHESIZER/VCO WITH
INTEGRATED 6GHz MIXER
Package: QFN, 32-Pin, 5mm x 5mm
RFFC5071A
RFFC5072A
Features
85MHz to 4200MHz LO
Frequency Range
Fractional-N Synthesizer with
Very Low Spurious Levels
Typical Step Size 1.5Hz
Fully Integrated Low Phase Noise
VCO and LO Buffers
Integrated Phase Noise
• 0.18° rms at 1GHz
• 0.52° rms at 3GHz
High Linearity RF Mixer(s)
30MHz to 6000MHz Mixer
Frequency Range
Input IP3 +23dBm
Mixer Bias Adjustable for Low
Power Operation
Full Duplex Mode (RFFC5071A)
2.7V to 3.3V Power Supply
Low Current Consumption
3- or 4-Wire Serial Interface
Applications
Wideband Radios
Distributed Antenna Systems
Diversity Receivers
Software Defined Radios
Frequency Band Shifters
Point-to-Point Radios
WiMax/LTE Infrastructure
Satellite Communications
Wideband Jammers
Remote Radio Heads
Phase
det.
Synth
Ref.
divider
Phase
det.
Synth
Ref.
divider
Functional Block Diagram
Product Description
The RFFC5071A and RFFC5072A are re-configurable frequency conversion devices
with integrated fractional-N phased locked loop (PLL) synthesizer, voltage con-
trolled oscillator (VCO) and either one or two high linearity mixers. The fractional-N
synthesizer takes advantage of an advanced sigma-delta modulator that delivers
ultra-fine step sizes and low spurious products. The VCO features temperature com-
pensation circuits that deliver stable performance across the operating tempera-
ture range of -40°C to +85°C. The PLL/VCO engine combined with an external loop
filter allows the user to generate local oscillator (LO) signals from 85MHz to
4200MHz. The LO signal is buffered and routed to the integrated RF mixers which
are used to up/down-convert frequencies ranging from 30MHz to 6000MHz. The
mixer bias current is programmable and can be reduced for applications requiring
lower power consumption. Both devices can be configured to work as signal
sources by bypassing the integrated mixers. Device programming is achieved via a
simple 3-wire serial interface. In addition, a unique programming mode allows up to
four devices to be controlled from a common serial bus. This eliminates the need
for separate chip-select control lines between each device and the host controller.
Up to six general purpose outputs are provided, which can be used to access inter-
nal signals (the LOCK signal, for example) or to control front end components. Both
devices operate with a 2.7V to 3.3V power supply.
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
BiFET HBT
LDMOS
DS140110
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2012, RF Micro Devices, Inc.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
1 of 26

1 page




RFFC5071A pdf
RFFC5071A/2A
Theory of Operation
The RFFC5071A and RFFC5072A are wideband RF frequency converter chips which include a fractional-N synthesizer and a
low noise VCO core. The RFFC5071A has an LO signal multiplexer, two LO buffer circuits, and two RF mixers. The RFFC5072A
has a single LO buffer circuit and one RF mixer. Both devices have an integrated voltage reference and low drop out regulators
supplying critical circuit blocks such as the VCOs and synthesizer. Synthesizer programming, device configuration and control
are achieved through a mixture of hardware and software controls. All on-chip registers are programmed through a simple 3-
wire serial interface.
VCO
The VCO core in the RFFC5071A and RFFC5072A consists of three VCOs which, in conjunction with the integrated LO dividers
of /2 to /32, cover the LO range of 85MHz to 4200MHz. Each VCO has 128 overlapping bands which are used to achieve low
VCO gain and optimal phase noise performance across the whole tuning range. The chip automatically selects the correct VCO
(VCO auto-select) and VCO band (VCO coarse tuning) to generate the desired LO frequency based on the values programmed
into the PLL1 and PLL2 registers banks.
The VCO auto-select and VCO coarse tuning are triggered every time ENBL is taken high, or if the PLL re-lock self clearing bit is
programmed high. Once the correct VCO and band have been selected the PLL will lock onto the correct frequency. During the
band selection process, fixed capacitance elements are progressively connected to the VCO resonant circuit until the VCO is
oscillating approximately at the correct frequency. The output of this band selection, CT_CAL, is made available in the read-
back register. A value of 127 or 0 in this register indicates that the coarse tuning was unsuccessful, and this will also be indi-
cated by the CT_FAILED flag also available in the read-back register. A CT_CAL value between 1 and 126 indicates a success-
ful calibration, the actual value being dependent on the desired frequency as well as process variation for a particular device.
The band select process will center the VCO tuning voltage at about 0.8V, compensating for manufacturing tolerances and pro-
cess variation as well as environmental factors including temperature. The VCOs have temperature compensation circuits so
the PLL will hold lock over the entire operating temperature range of -40°C to +85°C. This is true regardless of the tempera-
ture at which the VCO band selection is performed. The VCO gain is also held stable across temperature, maintaining consis-
tent loop bandwidth and synthesizer phase noise.
The RFFC5071A and RFFC5072A feature a differential LO input to allow the mixer to be driven from an external LO source. The
fractional-N PLL can be used with an external VCO driven into this LO input, which may be useful to reduce phase noise in
some applications. This may also require an external op-amp, dependant on the tuning voltage required by the external VCO.
In the RFFC5071A the LO signal is routed to mixer 1, mixer 2, or both mixers depending on the state of the MODE pin (or MODE
bit if under software control) and the value of the FULLD bit. Setting FULLD high puts the device into Full Duplex mode and both
mixers are enabled.
Fractional-N PLL
The RFFC5071A and RFFC5072A contain a charge pump-based fractional-N phase locked loop (PLL) for controlling the three
VCOs. The PLL includes automatic calibration systems to counteract the effects of process and environmental variations,
ensuring repeatable loop response and phase noise performance. As well as the VCO auto-select and coarse tuning, there is a
loop filter calibration mechanism which can be enabled if required. This operates by adjusting the charge pump current to
maintain loop bandwidth. This can be useful for applications where the LO is tuned over a wide frequency range.
The PLL has been designed to use a reference frequency of between 10MHz and 104MHz from an external source, which is
typically a temperature controlled crystal oscillator (TCXO). A reference divider (divide by 1 to divide by 7) is supplied and
should be programmed to limit the frequency at the phase detector to a maximum of 52MHz.
Two PLL programming banks are provided, the first bank is preceded by the label PLL1 and the second bank is preceded by the
label PLL2. For the RFFC5071A these banks are used to program mixer 1 and mixer 2 respectively, and are selected automati-
cally as the mixer is selected using MODE. For the RFFC5072A mixer 2 and register bank PLL2 are normally used.
DS140110
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
5 of 26

5 Page





RFFC5071A arduino
RFFC5071A/2A
Detailed Functional Block Diagram
+3V
OP2
Ext LO
RFXF8553
4:1 Balun
RFXF9503
1:1 Balun
IP2
Mixer 2
Loop
Filter
Pre-
scaler
Sequence
generator
N
divider
Phase
detector
/2n
[n=1..5]
+3V
51K
+3V
Control
Lines
3-Wire
Serial
Bus
MODE
ENBL
RESET
ENX
SDATA
SCLK
Reference
divider
GPO
Lock
Flag
Mixer 1
OP1
RFXF8553
4:1 Balun
IP1
RFXF9503
XO 1:1 Balun
RFFC5071A Only
Note: Wideband transmission line transformer baluns shown above for operation to ~2.5GHz. Substitute baluns for higher fre-
quency applications as required.
DS140110
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
11 of 26

11 Page







PáginasTotal 26 Páginas
PDF Descargar[ Datasheet RFFC5071A.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
RFFC5071WIDEBAND SYNTHESIZER/VCORF Micro Devices
RF Micro Devices
RFFC5071AWIDEBAND SYNTHESIZER/VCORF Micro Devices
RF Micro Devices

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar