RFFC2071A Datasheet, PDF (8/22 Pages) RF Micro Devices – 2.7GHz RF SYNTHESIZER/VCO WITH INTEGRATED RF MIXER

RFFC2071A/2A
The RFFC2071A mixer layout and pin placement has been optimized for high mixer-to-mixer isolation of greater than 60dB. The
mixers can be set up to operate in half duplex mode (1 mixer active) or full duplex mode (both mixers active). This selection is
done via control of MODE and by setting the FULLD bit. When in full duplex mode, either PLL register bank can be used, the LO
signal is routed to both mixers.
Mode
LOW
HIGH
LOW
HIGH
FULLD
0
0
1
1
Active PLL Active
Register Bank Mixer
1
1
2
2
1
1 and 2
2
1 and 2
Serial Interface
All on-chip registers in the RFFC2071A and RFFC2072A are programmed using a proprietary 3-wire serial bus which supports
both write and read operations. Synthesizer programming, device configuration, and control are achieved through a mixture of
hardware and software controls. Certain functions and operations require the use of hardware controls via the ENBL, MODE,
and RESETB pins in addition to programming via the serial bus. Alternatively there is the option to control the chip completely
via the serial bus.
The serial data interface can be configured for 4-wire operation by setting the 4WIRE bit in the SDI_CTRL register high. Then
pin 26 is used as the data out pin, and pin 32 is the serial data in pin.
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