10-bit, 7.5Msps, Ultra-Low-Power Analog Front-End

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The MAX19705 is an ultra-low-power, mixed-signal analog front-end (AFE) designed for power-sensitive communication equipment. Optimized for high dynamic performance at ultra-low power, the device integrates a dual 10-bit, 7.5Msps receive (Rx) ADC; dual 10-bit, 7.5Msps transmit (Tx) DAC; three fast-settling 12-bit aux-DAC channels for ancillary RF front-end control; and a 10-bit, 333ksps housekeeping aux-ADC. The typical operating power in Tx-Rx FAST mode is 28.2mW at a 7.5MHz clock frequency.

The Rx ADCs feature 55.1dB SNR and 73.4dBc SFDR at a 1.875MHz input frequency with a 7.5MHz clock frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-P full-scale signals. Typical I/Q channel matching is ±0.01° phase and ±0.02dB gain.

The Tx DACs feature 77.2dBc SFDR at fOUT = 620kHz and fCLK = 7.5MHz. The analog I/Q full-scale output voltage is ±400mV differential. The Tx DAC commonmode DC level is programmable from 0.9V to 1.35V. The I/Q channel offset is adjustable. The typical I/Q channel matching is ±0.03dB gain and ±0.08° phase.

The Rx ADC and Tx DAC share a single, 10-bit parallel, high-speed digital bus allowing half-duplex operation for time-division duplex (TDD) applications. A 3-wire serial interface controls power-management modes, the aux-DAC channels, and the aux-ADC channels.

The MAX19705 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19705 is specified for the extended (-40°C to +85°C) temperature range and is available in a 48-pin, thin QFN package. See a parametric table of the complete family of pin-compatible AFEs.

MAX19705: Functional Diagram MAX19705: Functional Diagram Enlarge+

Key Features

  • Dual 10-Bit, 7.5Msps Rx ADC and Dual 10-Bit, 7.5Msps Tx DAC
  • Ultra-Low Power
    28.2mW at fCLK = 7.5MHz, Fast Mode
    21mW at fCLK = 7.5MHz, Slow Mode
    Low-Current Standby and Shutdown Modes
  • Programmable Tx DAC Common-Mode DC Level and I/Q Offset Trim
  • Excellent Dynamic Performance
    SNR = 55.1dB at fIN = 1.875MHz (Rx ADC)
    SFDR = 77.2dBc at fOUT = 620kHz (Tx DAC)
  • Three 12-Bit, 1µs Aux-DACs
  • 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and Data Averaging
  • Excellent Gain/Phase Match
    ±0.01° Phase, ±0.02dB Gain (Rx ADC) at
    fIN = 1.875MHz
  • Multiplexed Parallel Digital I/O
  • Serial-Interface Control
  • Versatile Power-Control Circuits Shutdown, Standby, Idle, Tx/Rx Disable
  • Miniature 48-Pin Thin QFN Package (7mm x 7mm x 0.8mm)
  • Applications/Uses

    • Broadband Access Radio
    • Portable Communication Equipment
    • Private Mobile Radio (PMR)

    MAX19705EVKIT: Evaluation Kit for the MAX19705, MAX19706, MAX19707, and MAX19708
    MAX19706EVKIT: Evaluation Kit for the MAX19705, MAX19706, MAX19707, and MAX19708
    MAX19707EVKIT: Evaluation Kit for the MAX19705, MAX19706, MAX19707, and MAX19708
    MAX19708EVKIT: Evaluation Kit for the MAX19705, MAX19706, MAX19707, and MAX19708

    Technical Documents

    App Note 3853 Equalizing Techniques Flatten DAC Frequency Response
    Product Reliability Reports: MAX19705.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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