400 MHz TO 1250 MHz Quadrature Modulator with 750 MHz TO 1150 MHz Fractional-N PLL and Integrated VCO
The ADRF6701 provides a quadrature modulator and synthesizer solution within a small 6 mm × 6 mm footprint while requiring minimal external components.
The ADRF6701 is designed for RF outputs from 400 MHz to 1250 MHz. The low phase noise VCO and high performance quadrature modulator make the ADRF6701 suitable for next generation communication systems requiring high signal dynamic range and linearity. The integration of the IQ modulator, PLL, and VCO provides for significant board savings and reduces the BOM and design complexity.
The integrated fractional-N PLL/synthesizer generates a 2× fLO input to the IQ modulator. The phase detector together with an external loop filter is used to control the VCO output. The VCO output is applied to a quadrature divider. To reduce spurious components, a sigma-delta (Σ-Δ) modulator controls the programmable PLL divider.
The IQ modulator has wideband differential I and Q inputs, which support baseband as well as complex IF architectures. The single-ended modulator output is designed to drive a 50 Ω load impedance and can be disabled.
The ADRF6701 is fabricated using an advanced silicon-germanium BiCMOS process. It is available in a 40-lead, exposed-paddle, Pb-free, 6 mm × 6 mm LFCSP package. Performance is specified from −40°C to +85°C. A lead-free evaluation board is available.
- Cellular communications systems
GSM/EDGE, CDMA2000, W-CDMA, TD-SCDMA, LTE
- Broadband wireless access systems
- Satellite modems
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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.
ADRF6701-EVALZ is a fully-populated, 4-layer, Rogers 4350-based evaluation board. A 5 V/300 mA power supply is required and should be connected to the test points labeled VCC and GND (red and black). The PLL reference should be connected to the SMA connector labeled REF_IN, the baseband inputs to the SMA connectors labeled IPBB, INBB, QPBB, and QNBB. The RF output is available on the SMA labeled RF OUT. 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 Differential Dual Baseband TxDAC's
- For direct conversion transmit applications up to 500 MSPS , we recommend the AD9783, AD9122 or the AD9122 .
- For generating differential I and Q currents up to 125MSPS , we recommend the AD9117 .
- For even lower power requirements up to 125MSPS , we recommend the AD9717 .
- For higher bandwidths using data rates up to 250MSPS, with low noise and IMD , we recommend the AD9747, AD9125 or the AD9125 .
- For ultrlow noise and IMD at 1000MSPS , we recommend the AD9125, AD9122, AD9122, AD9125 or the AD9146 .
Recommended RF/IF Driver Amplifiers and Gain Blocks
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