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MAX19711
10-Bit, 11Msps, Full-Duplex, Analog Front-End

Ultra-Low-Power, Highly Integrated Transmit and Receive AFE with CDMA Filters


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 956kB)
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The MAX19711 is an ultra-low-power, highly integrated mixed-signal analog front-end (AFE) ideal for CDMA communication applications operating in full-duplex (FD) mode. Optimized for high dynamic performance and ultra-low power, the device integrates a dual 10-bit, 11Msps receive (Rx) ADC; dual 10-bit, 11Msps transmit (Tx) DAC with CDMA baseband filters; 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 FD mode is 37.5mW/42.7mW at a 4.915MHz/11MHz clock frequency.

The Rx ADCs feature 54.8dB SNR and 74.2dBc SFDR at 1.875MHz input frequency with an 11MHz 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 ±0.01dB gain.

The Tx DACs with CDMA lowpass filters feature -3dB cutoff frequency of 1.3MHz and > 64dBc stopband rejection at fIMAGE = 4.285MHz at fCLK = 4.915MHz. The analog I-Q full-scale output voltage range is selectable at ±410mV or ±500mV differential. The output DC common-mode voltage is selectable from 0.86V to 1.36V. The I/Q channel offset is adjustable to optimize radio lineup sideband/carrier suppression. Typical I-Q channel matching is ±0.03dB gain and ±0.07° phase.

Two independent 10-bit parallel, high-speed digital buses used by the Rx ADC and Tx DAC allow full-duplex operation for frequency-division duplex applications. The Rx ADC and Tx DAC can be disabled independently to optimize power management. A 3-wire serial interface controls power-management modes, the aux-DAC channels, and the aux-ADC channels.

The MAX19711 operates on a single 2.7V to 3.3V analog supply and 1.8V to 3.3V digital I/O supply. The MAX19711 is specified for the extended (-40°C to +85°C) temperature range and is available in a 56-pin, thin QFN package. The Selector Guide at the end of the data sheet lists other pin-compatible versions in this AFE family. For time-division duplex (TDD) applications, refer to the MAX19705–MAX19708 AFE family of products.

Key Features   Applications/Uses
  • Dual 10-Bit, 11Msps Rx ADC and Dual 10-Bit, 11Msps Tx DAC
  • Ultra-Low Power
    37.5mW/42.7mW at fCLK = 4.915MHz/11MHz, FD Mode
    24.3mW at fCLK = 11MHz, Slow Rx Mode
    34.5mW at fCLK = 11MHz, Slow Tx Mode
    Low-Current Standby and Shutdown Modes
  • Integrated CDMA Filters with > 64dBc Stopband Rejection
  • Programmable Tx DAC Common-Mode DC Level and I/Q Offset Trim
  • Excellent Dynamic Performance
    SNR = 54.8dB at fIN = 1.875MHz (Rx ADC)
    SFDR = 75dBc 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, ±0.01dB Gain (Rx ADC) at fIN = 1.87MHz
  • Multiplexed Parallel Digital I/O
  • Serial-Interface Control
  • Versatile Power-Control Circuits
    Shutdown, Standby, Idle, Tx/Rx Disable
  • Miniature 56-Pin Thin QFN

     
  • CDMA Data Cards
  • CDMA Handsets
  • Portable Communication Equipment

    Key Specifications:  Fast CODECs / Analog Front-End (AFE)
    Part Number Input Chan. Conv. Speed
    (Msps)
    SNR
    (dB)
    Resolution
    (bits)
    Output Chan. Speed
    (Msps)
    SFDR
    (dBc)
    THD
    (dBc)
    Noise Spectral Density
    (dBFS/Hz)
    VSUPPLY
    (V)
    Price
    ADC ADC @ fIN DAC DAC DAC @ fOUT @ fOUT @ fOUT See Notes
    MAX19711  2 11 54.8 @ 1.875MHz 10 2 11 75 @ 620kHz -75 @ 620kHz -115 @ 630kHz
    1.8
    2.7 to 3.3
    $8.75 @1k
    See All Fast CODECs / Analog Front-End (AFE) (15)

    Diagram
    MAX19711: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-0527; Rev 0; 2006-05-24
    This page last modified: 2006-05-24


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