AD6677:  80 MHz Bandwidth, IF Receiver

Product Details

Product Status:Recommended for New Designs

For more information on JESD204 go to www.analog.com/jesd204.

The AD6677 is an 11-bit, 250 MSPS, intermediate frequency (IF) receiver specifically designed to support multi-antenna systems in telecommunication applications where high dynamic range performance, low power, and small size are desired.

The device consists of a high performance analog-to-digital converter (ADC) and a noise shaping requantizer (NSR) digital block. The ADC consists of a multistage, differential pipelined architecture with integrated output error correction logic, and each ADC features a wide bandwidth switched capacitor sampling network within the first stage of the differential pipeline. An integrated voltage reference eases design considerations. A duty cycle stabilizer (DCS) compensates for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.

The ADC output is connected internally to an NSR block. The integrated NSR circuitry allows for improved SNR performance in a smaller frequency band within the Nyquist bandwidth. The device supports two different output modes selectable via the SPI. With the NSR feature enabled, the output of the ADC are processed such that the AD6677 supports enhanced SNR performance within a limited portion of the Nyquist bandwidth while maintaining an 11-bit output resolution.

The NSR block can be programmed to provide a bandwidth of either 22% or 33% of the sample clock. For example, with a sample clock rate of 250 MSPS, the AD6677 can achieve up to 76.3 dBFS SNR for a 55 MHz bandwidth in the 22% mode and up to 73.5 dBFS SNR for a 82 MHz bandwidth in the 33% mode.

When the NSR block is disabled, the ADC data is provided directly to the output at a resolution of 11 bits. The AD6677 can achieve up to 65.9 dBFS SNR for the entire Nyquist bandwidth when operated in this mode. This allows the AD6677 to be used in telecommunication applications such as a digital predistortion observation path where wider bandwidths are required.

The output data is routed directly to an external JESD204B serial output lane. This output is at current mode logic (CML) voltage levels. One mode is supported such that the output coded data is sent through one lane (L = 1; F = 4). Synchronization input controls (SYNCINB± and SYSREF±) are provided.

The AD6677 receiver digitizes a wide spectrum of IF frequencies. This IF sampling architecture greatly reduces component cost and complexity compared with traditional analog techniques or less integrated digital methods.

Flexible power-down options allow significant power savings, when desired. Programmable overrange level detection is supported via dedicated fast detect pins.

PRODUCT HIGHLIGHTS

  1. The configurable JESD204B output block with an integrated phase-locked loop (PLL) to support lane rates up to 5 Gbps.
  2. IF receiver includes an 11-bit, 250 MSPS ADC with programmable noise shaping requantizer (NSR) function that allows for improved SNR within a reduced bandwidth of 22% or 33% of the sample rate.
  3. Support for an optional RF clock input to ease system board design.
  4. Proprietary differential input maintains excellent SNR performance for input frequencies of up to 400 MHz.
  5. An on-chip integer, 1-to-8 input clock divider and SYNC input allows synchronization of multiple devices.
  6. Operation from a single 1.8 V power supply.
  7. Standard serial port interface (SPI) that supports various product features and functions, such as controlling the clock DCS, power-down, test modes, voltage reference mode, overrange fast detection, and serial output configuration.

APPLICATIONS

  • Communications
  • Diversity radio and smart antenna (MIMO) systems
  • Multimode digital receivers (3G)
    TD-SCDMA, WiMAX, WCDMA,
    CDMA2000, GSM, EDGE, LTE
  • I/Q demodulation systems
  • General-purpose software radios

FEATURES and BENEFITS

  • JESD204B Subclass 0 or Subclass 1 coded serial digital outputs
  • Signal-to-noise ratio (SNR) = 71.9 dBFS at 185 MHz AIN and 250 MSPS with NSR set to 33%
  • Spurious-free dynamic range (SFDR) = 87 dBc at 185 MHz AIN and 250 MSPS
  • Total power consumption:
    435 mW at 250 MSPS
  • 1.8 V supply voltages
  • Integer 1-to-8 input clock divider
  • Sample rates of up to 250 MSPS
  • IF sampling frequencies of up to 400 MHz
  • Internal analog-to-digital converter (ADC) voltage reference
  • Flexible analog input range
    -- 1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal)
  • ADC clock duty cycle stabilizer (DCS)
  • Serial port control
  • Energy saving power-down modes

Functional Block Diagram for AD6677

JESD204

Documentation

Title Content Type File Type
AD6677: 80 MHz Bandwidth, IF Receiver Data Sheet (Rev A, 03/2014) (pdf, 1259 kB) Data Sheets PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD6677 IBIS Model  (ibs) IBIS Models IBS

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD9683

  • For differential RF/IF, we recommend the ultra low distortion ADL5562.
  • For a fully differential input and output DVGA in digital communications systems, we recommend the ADL5201 or the AD8375.
Recommended Clock Drivers for the AD9683
  • For low jitter, low power, multi-output, we recommend the AD9525.
  • For low jitter performance and integrated VCO, we recommend one of the AD9520-0 or AD9522-0 family of selectable VCO frequencies.

  • For low jitter performance along with on chip PLL and VCO, we recommend the AD9523, AD9524 or the AD9525.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

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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.

AD6677 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD6677EBZ Status: Production Evaluation Board $300.00 Yes -

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.

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