AD6645:  14-Bit, 80 MSPS/105 MSPS A/D Converter

The AD6645 is a high speed, high performance, monolithic 14-bit analog-to-digital converter. All necessary functions, including track-and-hold (T/H) and reference, are included on the chip to provide ...More

To drive this ADC in DC-coupled applications, we suggest ADA4937-1 or ADA4938-1. To drive this ADC in AC-coupled applications, we suggest AD8352 or AD8375.

AD6645:  14-Bit, 80 MSPS/105 MSPS A/D Converter

Product Description

The AD6645 is a high speed, high performance, monolithic 14-bit analog-to-digital converter. All necessary functions, including track-and-hold (T/H) and reference, are included on the chip to provide a complete conversion solution. The AD6645 provides CMOS-compatible digital outputs. It is the fourth generation in a wideband ADC family, preceded by the AD9042 (12-bit, 41 MSPS), the AD6640 (12-bit, 65 MSPS, IF sampling), and the AD6644 (14-bit, 40 MSPS/65 MSPS).

Designed for multichannel, multimode receivers, the AD6645 is part of Analog Devices, Inc. SoftCell® transceiver chipset. The AD6645 maintains 100 dB multitone, spurious-free dynamic range (SFDR) through the second Nyquist band. This breakthrough performance eases the burden placed on multimode digital receivers (software radios) that are typically limited by the ADC. Noise performance is exceptional; typical signal-to-noise ratio is 74.5 dB through the first Nyquist band.

The AD6645 is built on Analog Devices’ extra fast complementary bipolar (XFCB) process and uses an innovative, multipass circuit architecture. Units are available in a thermally enhanced 52-lead PowerQuad 4 (LQFP_PQ4) package specified from −40°C to +85°C at 80 MSPS and −10°C to +85°C at 105 MSPS.

Product Highlights

  • IF Sampling. The AD6645 maintains outstanding ac performance up to input frequencies of 200 MHz, suitable for multicarrier 3G wideband cellular IF sampling receivers.
  • Pin Compatibility. The ADC has the same footprint and pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC.
  • SFDR Performance and Oversampling. Multitone SFDR performance of 100 dBFS can reduce the requirements of high end RF components and allows the use of receive signal processors such as the AD6620, AD6624/AD6624A, or AD6636.

    • Applications

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

    • Data Sheet, Rev. D, 10/08

    Features

    • SNR = 75 dB, fIN 15 MHz, up to 105 MSPS
    • SNR = 72 dB, fIN200 MHz, up to 105 MSPS
    • SFDR = 89 dBc, fIN 70 MHz, up to 105 MSPS
    • 100 dBFS multitone SFDR
    • IF sampling to 200 MHz
    • Sampling jitter 0.1 ps
    • 1.5 W power dissipation
    • Differential analog inputs
    • Pin compatible to AD6644
    • Twos complement digital output format
    • 3.3 V CMOS compatible
    • DataReady for output latching

    Diagrams

    AD6645 Diagram
    Functional Block Diagram for AD6645

    Specifications

    Resolution (Bits) 14bit
    T-Put Rate 105MSPS
    # Chan 1
    Supply V Multi(+3.3, +5)
    Pwr Diss (max) 1.75W
    Interface Par
    Ain Range 2.2 V p-p
    SNR (dB) 75dB
    Pkg Type QFP

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    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD9246-105 14 105MSPS 1 458mW
    AD6645-105 14 105MSPS 1 1.75W
    AD9246-125 14 125MSPS 1 458mW
    AD9254 14 150MSPS 1 470mW
    AD9640-150 14 150MSPS 2 938mW
    AD9230-170 12 170MSPS 1 407mW
    AD9261 16 160MSPS 1 473mW