AD9969:  Single-Supply Cable Modem/Set-Top Box Mixed-Signal Front End

The AD9969 is a single-supply cable modem/set-top box mixed-signal front end. The device contains a transmit path interpolation filter, a complete quadrature digital up-converter, and transmit DAC. ...More

AD9969:  Single-Supply Cable Modem/Set-Top Box Mixed-Signal Front End

Product Description

The AD9969 is a single-supply cable modem/set-top box mixed-signal front end. The device contains a transmit path interpolation filter, a complete quadrature digital up-converter, and transmit DAC. The receive path contains dual 12-bit ADC and a 10-bit ADC. All internally required clocks and an output system clock are generated by the PLL from a single crystal oscillator or clock input.

The transmit path interpolation filter provides an up-sampling factor of 8× with an output signal bandwidth up to 8.7 MHz for 1dB passband ripple. Carrier frequencies up to 65 MHz with 26 bits of frequency tuning resolution can be generated by the direct digital synthesizer (DDS). The transmit DAC resolution is 14 bits and can run at sampling rates as high as 232 MSPS. Analog output scaling from 0 dB to 7.5 dB in 0.5 dB steps is available to preserve SNR when reduced output levels are required.

The 12-bit ADCs provide excellent under-sampling performance, allowing this device to sample IF inputs up to 70 MHz. The 12-bit IF ADCs can sample at rates up to 29 MSPS, allowing the AD9969 to process wideband signals.

The AD9969 includes two programmable sigma-delta DACs, which can be used to control an external components such as a variable gain amplifier (VGA) or a voltage controlled tuner.

The AD9969 also integrates a CA port that enables a host processor to control programmable gain amplifier (PGA) cable drivers, such as AD832x series, via the MxFE™ serial port.

The AD9969 is available in a lead-free 100-lead LQFP package. The AD9969 is specified over the commercial ( 0°C to +70°C) temperature range.

Applications

  • Cable set-top boxes
  • Cable and wireless modems

    • Features

    • Low cost 3.3 V CMOS MxFE™ for broadband applications
    • DOCSIS, DOCSIS 2.0, OpenCable, EURO-DOCSIS, DVB-C, DAVIC compliant
    • 232 MHz quadrature digital upconverter
    • 14-bit direct IF DAC (TxDAC+™)
    • Up to 65 MHz carrier frequency DDS
    • Programmable sampling clock rates
    • Analog Tx output level adjust
    • Dual 12-bit, 29 MSPS direct IF ADCs with video clamp input
    • 10-bit, 29 MSPS sampling ADC
    • Dual 8-bit sigma-delta auxiliary DACs
    • Direct interface to AD8321/AD8323 or AD8322/AD8327 PGA cable driver

    Diagrams

    AD9969 Diagram
    Functional Block Diagram for AD9969

    技术指标

    Resolution (Bits) 12bit
    T-Put Rate 29MSPS
    Part # AD9969
    Supply V Single(+3.3)

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