ADF4208

Dual, Integer-N 1.1 GHz / 2.0 GHz PLL

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Product Details

The ADF420x family of dual frequency synthesizers are used to implement local oscillators in the upconversion and downconversion sections of wireless receivers and transmitters. Each synthesizer consists of a low noise, digital, phase frequency detector (PFD); a precision charge pump; a programmable reference divider; programmable A and B counters; and a dual modulus prescaler (P/P + 1). The A (6-bit) and B (11-bit) counters, in conjunction with the dual modulus prescaler (P/P + 1), implement an N divider (N = BP + A). In addition, the 14-bit reference counter (R counter) allows selectable REFIN frequencies at the PFD input. The on-chip oscillator circuitry allows the reference input to be derived from crystal oscillators.

A complete phase-locked loop (PLL) can be implemented if the synthesizers are used with an external loop filter and voltage controlled oscillators (VCOs).

Control of all the on-chip registers is via a simple 3-wire interface. The devices operate with a power supply ranging from 2.7 V to 5.5 V and can be powered down when not in use.

Applications

  • Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
  • Base stations for wireless radio (GSM, PCS, DCS, CDMA, WCDMA)
  • Wireless LANS Communications test equipment
  • CATV equipment

Product Lifecycle

checked Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

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Design Tools

Product Recommendations

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ADF4208 Companion Parts

Recommended Linear Regulators

  • For ultalow noise, 3V applications, 200 mA output , we recommend the ADP151 .
  • For a step up, 3V to 5V regulator , we recommend the ADP1613 .
  • For ultralow noise, 3V applications,150 mA output , we recommend the ADP150 .
  • For high accuracy, 5V applications , we recommend the ADP3334 .

Recommended Divide-by-4 Prescaler

  • For a low noise, low power, fixed RF block , we recommend the ADF5001 .

Recommended Modulators/Demodulators

  • For broadband quadrature IF/RF signals , we recommend the ADL5375 or the ADL5380 .

Recommended PLL Active Filter

  • For an ultralow noise, rail-to-rail amplifier , we recommend the OP184 .

Recommended RF Mixers

  • For 10 MHz to 6 GHz, high dynamic range active mixers , we recommend the ADL5801 or the ADL5802 .

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.

ADF4208 Material Declaration
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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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