Features and Benefits
- IQ modulator with integrated fractional-N PLL
- Output frequency range: 2050 MHz to 3000 MHz
- Internal LO frequency range: 2500 MHz to 2900 MHz
- Output P1dB: 12.1 dBm @ 2700 MHz
- Output IP3: 27.2 dBm @ 2700 MHz
- Noise floor: −158.3 dBm/Hz @ 2700 MHz
- Baseband bandwidth: 750 MHz (3 dB)
- SPI serial interface for PLL programming
- Integrated LDOs and LO buffer
- Power supply: 5 V/226 mA
- 40-lead 6 mm × 6 mm LFCSP
The ADRF6704 provides a quadrature modulator and synthesizer solution within a small 6 mm × 6 mm footprint while requiring minimal external components.
The ADRF6704 is designed for RF outputs from 2050 MHz to 3000 MHz. The low phase noise VCO and high performance quadrature modulator make the ADRF6704 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 ADRF6704 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
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
ADRF6704-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.
Software & Systems Requirements
Tools & Simulations
ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
ADRF6704 Companion Parts
Recommended Differential Dual Baseband TxDAC's
- For generating differential I and Q currents up to 125MSPS: AD9117.
- For even lower power requirements up to 125MSPS: AD9717.
- For direct conversion transmit applications up to 500 MSPS: AD9783, AD9122, AD9122.
- For higher bandwidths using data rates up to 250MSPS, with low noise and IMD: AD9747, AD9125, AD9125.
- For ultrlow noise and IMD at 1000MSPS: AD9125, AD9122, AD9122, AD9125, AD9146.
Product Selection Guide (1)
Technical Articles (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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