National Semiconductor | High-performance Analog

 

 LM97593   

Dual ADC / Digital Tuner / AGC
Click link to Download

Features

  • 100% Software compatible with the CLC5903
  • Pin compatible with the CLC5903 except for the analog input and reference section
  • 123 dB dynamic range with CLC5526 DVGA (200kHz)
  • On-chip precision reference
  • User Programmable AGC with enhanced Power Detector
  • Channel Filters include a Fourth Order CIC followed by 21-tap and 63-tap Symmetric FIRs
  • Flexible output formats
  • Serial and Parallel output ports
  • JTAG Boundary Scan
  • 8-bit Microprocessor Interface
  • 128 pin PQFP
  • Description

    The LM97593 Dual ADC / Digital Tuner / AGC IC is a two channel digital downconverter (DDC) with integrated 12-bit analog-to-digital converters (ADCs) and automatic gain control (AGC). The LM97593 further enhances National’s Diversity Receiver Chipset (DRCS) by integrating a wide-bandwidth dual ADC core with the DDC. The complete DRCS includes one LM97593 Dual ADC / Digital Tuner / AGC and two CLC5526 digitally controlled variable gain amplifiers (DVGAs). This system allows direct IF sampling of signals up to 300MHz for enhanced receiver performance and reduced system costs. A block diagram for a DRCS-based narrowband communications system is shown in .

    The LM97593 offers high dynamic range digital tuning and filtering based on hard-wired digital signal processing (DSP) technology. Each channel has independent tuning, phase offset, filter coefficients, and gain settings. Channel filtering is performed by a series of three filters. The first is a 4-stage Cascaded Integrator Comb (CIC) filter with a programmable decimation ratio from 8 to 2048. Next there are two symmetric FIR filters, a 21-tap and a 63-tap, both with independent programmable coefficients. The first FIR filter decimates the data by 2, the second FIR decimates by either 2 or 4. Channel filter bandwidth at 52MSPS ranges from ±650kHz down to ±1.3kHz. At 65MSPS, the maximum bandwidth increases to ±812kHz.

    The LM97593’s AGC controller monitors the ADC output and controls the ADC input signal level by adjusting the DVGA setting. AGC threshold, deadband+hysteresis, and the loop time constant are user defined. Total dynamic range of greater than 123dB full-scale signal to noise in a 200kHz bandwidth can be achieved with the Diversity Receiver Chipset.

    Key Specification

    Internal ADC Resolution

    12 Bits

    Sample Rate

    65 MSPS

    SNR (fIN = 250MHz, 11-bit, Nyquist)

    62 dBFS (typ)

    SNR (fIN = 250MHz, 200kHz)

    83 dBFS (typ)

    SFDR (fIN = 250MHz, 11-bit, Nyquist)

    68 dBFS (typ)

    Full Power Bandwidth

    650 MHz (typ)

    Power Consumption (65MSPS)

    560 mW (typ)


    Applications

  • Cellular Basestations
  • GSM / GPRS / EDGE / GSM Phase 2 Receivers
  • Satellite Receivers
  • Wireless Local Loop Receivers
  • Digital Communications


  • application circuit

     

    ParametersValues
    Temperature Min -40 deg C
    Temperature Max 85 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LM97593 Dual ADC / Digital Tuner / AGC3858
    Kbytes
    12-Mar-08   

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM97593VH/NOPB

    LM97593VH

    RoHS Status


    PQFP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide75
    MOUSERWorldwide56
    $38.50 each at 1K+ pcstray
    of
    66

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM97593.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM97593 is located at RoHS Status.

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM97593VH/NOPB

    LM97593VH
    1695.551
    1700.001
    PQFP1283
    3
    245
    245
    DetailDownloadN/A
    NSUZXYYTTE#
    LM97593VH

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM97593.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM97593 is located at RoHS Status.

    CAD Symbols and Models
    Download LM97593 CAD Symbols
     Models
    N/A


    [Information as of 9-Feb-2012]