750 MHz TO 1150 MHz Quadrature Demodulator with Fractional-N PLL and VCO
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.
- QAM/QPSK RF/IF demodulators
- Cellular W-CDMA/CDMA/CDMA2000
- Microwave point-to-(multi)point radios
- Broadband wireless and WiMAX
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
ADRF6801-EVALZ is a fully populated, 4-layer, Rogers-based evaluation board. Input and baseband output SMA connections with single ended setups are featured. There is an option of fully differential baseband signaling on the output at the card edge . Access to the +5 V/262 mA single supply is achieved with clip leads to the VCC2 and GND2 testpoint; it has a range from +4.75 V to +5.25 V. The evaluation board can be programmed through the USB port of a PC running Windows XP or Vista with Microsoft .NET Framework 3.5 installed. The required control software can be downloaded from www.analog.com.
Recommended Baseband Driver Amplifiers
- For a digital programmable VGA: AD8366.
- For a differential RF/IF amplifier: ADL5562, ADL5565.
- For low noise drivers in low voltage (1.8V) ADC applications: ADA4930-1, ADA4930-2.
- For variable gain and programmable baseband filters: ADRF6510, ADRF6516.
- For selectable gains of 1, 2 or 3: ADA4950-1, ADA4950-2.
Recommended Dual Analog-to-Digital Converters
- For 12-bit performance, low power, low cost and ease of use: AD9231.
- For 14-bit performance, low power and high sampling rate: AD9258, AD9251.
- For 16-bit performance, multistage differential pipeline architecture with integrated quadrature error correction (QEC): AD9269.
- For 16-bit performance, low power and high sampling rate: AD9268, AD9650.
- For 16-bit performance, continuous time sigma delta architecture with integrated QEC: AD9262.
Product Selection Guide
RF, Microwave, and Millimeter Wave IC Selection Guide 2017
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