AD9854:  CMOS 300 MSPS Quadrature Complete DDS

The AD9854 digital synthesizer is a highly integrated device that uses advanced DDS technology, coupled with two internal high speed, high performance quadrature DACs to form a digitally programmable ...More

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AD9854:  CMOS 300 MSPS Quadrature Complete DDS

Product Description

The AD9854 digital synthesizer is a highly integrated device that uses advanced DDS technology, coupled with two internal high speed, high performance quadrature DACs to form a digitally programmable I and Q synthesizer function. When referenced to an accurate clock source, the AD9854 generates highly stable, frequency-phase, amplitude-programmable sine and cosine outputs that can be used as an agile LO in communications, radar, and many other applications. The innovative high speed DDS core of the AD9854 provides 48-bit frequency resolution (1 μHz tuning resolution with 300 MHz SYSCLK). Maintaining 17 bits ensures excellent SFDR.

The circuit architecture of the AD9854 allows the generation of simultaneous quadrature output signals at frequencies up to 150 MHz, which can be digitally tuned at a rate of up to 100 million new frequencies per second. The sine wave output (externally filtered) can be converted to a square wave by the internal comparator for agile clock generator applications. The device provides two 14-bit phase registers and a single pin for BPSK operation.

For higher-order PSK operation, the I/O interface can be used for phase changes. The 12-bit I and Q DACs, coupled with the innovative DDS architecture, provide excellent wideband and narrow-band output SFDR. The Q DAC can also be configured as a user-programmable control DAC if the quadrature function is not desired. When configured with the comparator, the 12-bit control DAC facilitates static duty cycle control in high speed clock generator applications.

Two 12-bit digital multipliers permit programmable amplitude modulation, on/off output shaped keying, and precise amplitude control of the quadrature output. Chirp functionality is also included to facilitate wide bandwidth frequency sweeping applications. The programmable 4× to 20× REFCLK multiplier circuit of the AD9854 internally generates the 300 MHz system clock from an external lower frequency reference clock. This saves the user the expense and difficulty of implementing a 300 MHz system clock source.

Direct 300 MHz clocking is also accommodated with either single-ended or differential inputs. Single-pin conventional FSK and the enhanced spectral qualities of ramped FSK are supported. The AD9854 uses advanced 0.35 μm CMOS technology to provide a high level of functionality on a single 3.3 V supply.

The AD9854 is pin-for-pin compatible with the AD9852 single-tone synthesizer. It is specified to operate over the extended industrial temperature range of −40°C to +85°C.

Applications

  • Agile, quadrature LO frequency synthesis
  • Programmable clock generators
  • FM chirp source for radar and scanning systems
  • Test and measurement equipment
  • Commercial and amateur RF exciters

    • Data Sheet, Rev. E, 7/07

    Features

    • 300 MHz internal clock rate
    • FSK, BPSK, PSK, chirp, AM operation
    • Dual integrated 12-bit digital-to-analog converters (DACs)
    • Ultrahigh speed comparator, 3 ps rms jitter
    • Excellent dynamic performance
      80 dB SFDR at 100 MHz (±1 MHz) AOUT
    • 4× to 20× programmable reference clock multiplier
    • Dual 48-bit programmable frequency registers
    • Dual 14-bit programmable phase offset registers
    • 12-bit programmable amplitude modulation and on/off output shaped keying function
    • Single-pin FSK and BPSK data interfaces
    • PSK capability via input/output interface
    • Linear or nonlinear FM chirp functions with single-pin frequency hold function

    Diagrams

    AD9854 Diagram
    Functional Block Diagram for AD9854

    Specifications

    Compliance Range (V) 1V
    FS Iout (mA nom) 10mA
    I Supply total (max) 1210mA
    I/O Interface Parallel,Serial
    Master fclk 300MHz
    Nominal Supply (V) Single(+3.3)
    On-Board Comparator Yes
    REFCLK Multiplier Yes
    Resolution (Bits) 12bit

    AD9913 - Low Power 250 MSPS 10-Bit DAC 1.8 V CMOS Direct Digital Synthesizer

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    Part# Master fclk Resolution (Bits) Tuning Word Width (bits) Nominal Supply (V) I Supply total (max) FS Iout (mA nom) Compliance Range (V) REFCLK Multiplier On-Board Comparator I/O Interface Price* (1000-4999) Product Description
    AD9913 250MHz 10 32 Single(+1.8) 63.5mA 4.6 0.8 Yes No Parallel, Serial $9.77 Low power 250 MSPS DDS with 10 bit DAC output
    AD9833 25MHz 10 28 Single(+2.3 to +5.5), Single(+2.5), Single(+2.7), Single(+3), Single(+3.3), Single(+3.6), Single(+5) 5.5mA 3 0.65 No No Serial $4.00 25 MHz, Serial Input, Programmable DDS Waveform Generator
    AD9831 25MHz 10 32 Single(+3.3), Single(+3.6), Single(+5) 15mA 4 1.5 No No Parallel $6.33 CMOS, 25 MHz Parallel Input DDS with On-Chip 10-Bit DAC & Sine Lookup Table
    AD9832 25MHz 10 32 Single(+3.3), Single(+3.6), Single(+5) 15mA 4 1.35 No No Serial $5.06 CMOS, 25 MHz Serial Input DDS with On-Chip 10-Bit DAC & Sine Lookup Table
    AD5930 50MHz 10 24 Single(+2.3 to +5.5) 8mA 3.1 0.8 No No Serial $6.38 Programmable Frequency Sweep and Output Burst Waveform Generator
    AD5932 50MHz 10 24 Single(+2.3 to +5.5) 8mA n/a n/a Yes No Serial $4.15 Programmable Single-Scan Waveform Generator
    AD9830 50MHz 10 32 Single(+5) 60mA 20 1 No No Parallel $11.08 CMOS, 50 MHz Parallel Load DDS with On-Chip 10-Bit DAC & Sine Lookup Table
    AD9835 50MHz 10 32 Single(+5) 40mA 4 1.35 No No Serial $5.82 CMOS, Serial Input, 50 MHz DDS with On-Chip 10-Bit DAC
    AD9834 75MHz 10 28 Single(+2.3 to +5.5), Single(+2.5), Single(+2.7), Single(+3), Single(+3.3), Single(+3.6), Single(+5) 8.7mA 3 0.8 No Yes Serial $5.01 Low Power, 50 MHz Serial Input DDS With On-Board Comparator
    AD9850 125MHz 10 32 Single(+3.3), Single(+5) 96mA 20 1.5 No Yes Parallel, Serial $12.14 CMOS, 125 MHz Serial/Byte-Parallel Input, Complete DDS
    AD9851 180MHz 10