AD6644:  14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter

The AD6644 is a high speed, high performance, monolithic 14-bit analog-to-digital converter (ADC). All necessary functions, including track-and-hold (TH) and reference are included on- chip to provide ...More

To drive this ADC in DC-coupled applications, we suggest ADA4938-1. To drive this ADC in AC-coupled applications, we suggest AD8351 or AD8375.

AD6644:  14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter

Product Description

The AD6644 is a high speed, high performance, monolithic 14-bit analog-to-digital converter (ADC). All necessary functions, including track-and-hold (TH) and reference are included on- chip to provide a complete conversion solution. The AD6644 provides CMOS-compatible digital outputs. It is the third generation in a wideband ADC family, preceded by the AD9042 (12-bit 41 MSPS) and the AD6640 (12-bit 65 MSPS, IF sampling).

Designed for multichannel, multimode receivers, the AD6644 is part of the Analog Devices, Inc. new SoftCell® transceiver chipset. The AD6644 achieves 100 dB multitone, spurious-free dynamic range (SFDR) through the Nyquist band. This break- through performance eases the burden placed on multimode digital receivers (software radios) which are typically limited by the ADC. Noise performance is exceptional; typical signal-to- noise ratio is 74 dB.

The AD6644 is also useful in single channel digital receivers designed for use in wide-channel bandwidth systems (CDMA, WCDMA). With oversampling, harmonics can be placed outside the analysis bandwidth. Oversampling also facilitates the use of decimation receivers (such as the AD6620), allowing the noise floor in the analysis bandwidth to be reduced. By replacing traditional analog filters with predictable digital components, modern receivers can be built using fewer RF components, resulting in decreased manufacturing costs, higher manufacturing yields, and improved reliability.

The AD6644 is built on the Analog Devices high speed complementary bipolar process (XFCB) and uses an innovative, multipass circuit architecture. Units are packaged in a 52-lead plastic low profile quad flat package (LQFP) specified from – 25°C to +85°C.

Product Highlights

  1. Guaranteed sample rate is 65 MSPS.
  2. Fully differential analog input stage.
  3. Digital outputs can be run on 3.3 V supply for easy interface to digital ASICs.
  4. Complete solution: reference and track-and-hold.
  5. Packaged in small, surface-mount, plastic, 52-lead LQFP.

Applications

  • Multichannel, multimode receivers
  • AMPS, IS-136, CDMA, GSM, WCDMA
  • Single channel digital receivers
  • Antenna array processing
  • Communications instrumentation
  • Radar, infrared imaging
  • Instrumentation

    • Data Sheet, Rev. D, 8/07

    Features

    • 65 MSPS guaranteed sample rate
    • 40 MSPS version available
    • Sampling jitter < 300 fs
    • 100 dB multitone SFDR
    • 1.3 W power dissipation
    • Differential analog inputs
    • Pin compatible to AD6645
    • Twos complement digital output format
    • 3.3 V CMOS compatible
    • Data-ready for output latching

    Diagrams

    AD6644 Diagram
    Functional Block Diagram for AD6644

    Specifications

    Resolution (Bits) 14bit
    T-Put Rate 65MSPS
    # Chan 1
    Supply V Multi(+3.3, +5)
    Pwr Diss (max) 1.5W
    Interface Par
    Ain Range 2.2 V p-p
    SNR (dB) 74.5dB
    Pkg Type QFP

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    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD6644-65 14 65MSPS 1 1.5W
    AD9244-65 14 65MSPS 1 640mW
    AD9245 14 80MSPS 1 414mW
    AD9246-105 14 105MSPS 1 458mW
    AD9246-125 14 125MSPS 1 458mW
    AD9254 14 150MSPS 1 470mW
    AD9444 14 80MSPS 1 1.4W