ADRF6850

100 MHz TO 1000 MHz Integrated Broadband Receiver
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Product Details

The ADRF6850 is a highly integrated broadband quadrature demodulator, frequency synthesizer, and variable gain amplifier (VGA). The device covers an operating frequency range from 100 MHz to 1000 MHz for use in both narrowband and wideband communications applications, performing quadrature demodulation from IF directly to baseband frequencies.

The ADRF6850 demodulator includes a high modulus fractional-N frequency synthesizer with integrated VCO, providing better than 1 Hz frequency resolution, and a 60 dB gain control range provided by a front-end VGA.

Control of all the on-chip registers is through a user-selected SPI interface or I2C interface. The device operates from a single power supply ranging from 3.15 V to 3.45 V.

Applications

  • Broadband communications
  • Cellular communications
  • Satellite communications

Product Lifecycle

checked Recommended for New Designs

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.

Evaluation Kits

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Product Details

The ADRF6850 evaluation board (EVAL-ADRF6850EB1Z) is designed to allow the user to evaluate all aspects of the ADRF6850. The board comes with a software GUI on a CD which allows the user to write to the complete register set of the ADRF6850 through the parallel port of a PC either via an SPI or I2C interface. It has SMA connectors for the demodulator’s input RF signal (connected for single-ended operation on this board), the output baseband signals, the VGAIN input which controls the gain of the VGA as well as the +3.3V power supplies. It contains a 13.5 MHz reference clock for the reference input of the on-chip PLL and the ability to drive this input with an external reference clock if so desired. It contains a 4th order loop filter for the PLL which is optimized for best rms jitter performance with a 13.5 MHz reference clock and a charge pump current of 2.5 mA. The loop bandwidth is approximately 50 kHz with a phase margin of 55⁰. The PLL frequency and performance can be monitored using the LOMON outputs. These are open-collector outputs and need to be terminated to 3.3V using on-board 50 Ω resistors or pull-up inductors. Lock detect and MUXOUT can also be monitored. All supplies are decoupled by a parallel combination of 100 nF and 56 pF capacitors. Low frequency decoupling is provided by a 10 µF capacitor. More details of the evaluation board is contained in the ADRF6850 datasheet.

Tools & Simulations

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Design Tools

Design Resources

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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.

ADRF6850 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

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Reviews

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Overview

4 Reviews
2 out of 4 (50%) customers recommend this product.
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Most Helpful Review

by Dr. Ram
The nicest thing about the ADRF6850 is that it is a general purpose broadband receiver all the way from 100MHz to 1 GHz with no holes. Specs are excellent and it is easy to get it to work with the eval board. However, the eval board could have been a lot better. It comes with a parallel port which is obsolete. But worse still, the parallel port interface works reliably with desktops and does not work reliably with laptops. I have a Thinkpad T30 and a Dell D505 with working parallel ports, and it would work only with the latter. I believe the slightly lower voltage levels with the T30 are causing problems.

Most Recent Review

by hard_coded
The ADRF6850 makes me capable to build a software defined radio for vhf Ham band monitoring for little or no effort. Great product!

All Reviews

by hard_coded, 23 Jan 15
SDR made simple
The ADRF6850 makes me capable to build a software defined radio for vhf Ham band monitoring for little or no effort. Great product!
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by richardhmayo, 8 Jan 15
Phase control
It's a pity that the ADRF6850 has a separate divider chain for the synthesiser and quadrature mixer l.o. This means that two or more devices driven from the same reference will have random phase relationship. A demodulator partner to the AD8345 would be good for me, having "passive" phase shifters.
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by behi, 29 Dec 13
a note about the VGA
all components of this IC are wideband and work very good at 100-1000MHz. but this IC can not work as a wideband receiver, and can only work as a narrow band receiver in any frequency from 100-1000MHz. why?... because of the really high gain vga at the input. this causes that the receiver saturate with adjacent channels. I suggest that analog devices build a compatible IC without this undesirable VGA.
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by Dr. Ram, 12 Apr 13
Powerful, flexible device, eval board could be a bit better
The nicest thing about the ADRF6850 is that it is a general purpose broadband receiver all the way from 100MHz to 1 GHz with no holes. Specs are excellent and it is easy to get it to work with the eval board. However, the eval board could have been a lot better. It comes with a parallel port which is obsolete. But worse still, the parallel port interface works reliably with desktops and does not work reliably with laptops. I have a Thinkpad T30 and a Dell D505 with working parallel ports, and it would work only with the latter. I believe the slightly lower voltage levels with the T30 are causing problems.
Was this Helpful?Helpful(0)

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.