750 MHz to 1150 MHz Quadrature
Demodulator with Fractional-N PLL and VCO
IQ demodulator with integrated fractional-N PLL
LO frequency range: 750 MHz to 1150 MHz
Input P1dB: 12.5 dBm
Input IP3: 25 dBm
Noise figure (DSB): 14.3 dB
Voltage conversion gain: 5.1 dB
Quadrature demodulation accuracy
Phase accuracy: 0.3°
Amplitude accuracy: 0.05 dB
Baseband demodulation: 275 MHz, 3 dB bandwidth
SPI serial interface for PLL programming
40-lead, 6 mm × 6 mm LFCSP
QAM/QPSK RF/IF demodulators
Microwave point-to-(multi)point radios
Broadband wireless and WiMAX
The ADRF6801 is a high dynamic range IQ demodulator with
integrated PLL and VCO. The fractional-N PLL/synthesizer
generates a frequency in the range of 3.0 GHz to 4.6 GHz. A
divide-by-4 quadrature divider divides the output frequency of
the VCO down to the required local oscillator (LO) frequency
to drive the mixers in quadrature. Additionally, an output buffer
can be enabled that generates an fVCO/2 signal for external use.
The PLL reference input is supported from 10 MHz to 160 MHz.
The phase detector output controls a charge pump whose output
is integrated in an off-chip loop filter. The loop filter output is
then applied to an integrated VCO.
The IQ demodulator mixes the differential RF input with the
complex LO derived from the quadrature divider. The differential
I and Q output paths have excellent quadrature accuracy and
can handle baseband signaling or complex IF up to 120 MHz.
The ADRF6801 is fabricated using an advanced silicon-germanium
BiCMOS process. It is available in a 40-lead, exposed-paddle,
RoHS-compliant, 6 mm × 6 mm LFCSP package. Performance is
specified over the −40°C to +85°C temperature range.
FUNCTIONAL BLOCK DIAGRAM
1 2 10
VCC1 DECL3 VCC2
CPOUT GND RSET
18 19 20
QBBP QBBN GND
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