Maker : Analog Devices
Part No. : AD6645

  Datasheet PDF : AD6645.pdf
  Cross Reference : AD6645 Cross Reference
  Buy Component : AD6645 Find Stock and Price

Shortcut : AD664  AD6640  AD6640AST  AD6640PCB  AD6640ST  AD6640ST/PCB  AD6641  AD6642  AD6643  AD6644  AD6644AST-40  AD6644AST-65  AD6644PCB  AD6644ST  AD6644ST/PCB  AD6645  AD6645/PCB  AD6645ASQ-80  AD6645PCB  AD6649  AD664AD-BIP  AD664AD-UNI  AD664AJ  AD664BD-BIP  AD664BD-UNI  AD664BE  AD664BJ  AD664JN-BIP  AD664JN-UNI  AD664JP  AD664KN-BIP  AD664KN-UNI  AD664KP  AD664SD-BIP  AD664SD-UNI  AD664TD-BIP  AD664TD-UNI 

Product Information

www.DataSheet4U.com 14-Bit, 80 MSPS/105 MSPS A/D Converter AD6645 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 the 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 (SNR) is 74.5 dB through the first Nyquist band. The AD6645 is built on the Analog Devices extra fast complementary bipolar (XFCB) process and uses an innovative, multipass circuit architecture. Units are available in thermally enhanced 52-lead PowerQuad 4 (LQFP_PQ4) and 52-lead exposed pad (TQFP_EP) packages specified from −40°C to +85°C at 80 MSPS and −10°C to +85°C at 105 MSPS. FEATURES SNR = 75 dB, fIN 15 MHz, up to 105 MSPS SNR = 72 dB, fIN 200 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 Data-ready for output latching APPLICATIONS Multichannel, multimode receivers Base station infrastructures AMPS, IS-136, CDMA, GSM, W-CDMA Single channel digital receivers Antenna array processing Communications instrumentation Radars, infrared imaging Instrumentation PRODUCT HIGHLIGHTS 1. 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. 2. 3. GENERAL DESCRIPTION The AD6645 is a high speed, high performance, monolithic 14-bit analog-to-digital converter (ADC). 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 AVCC DVCC FUNCTIONAL BLOCK DIAGRAM AD6645 AIN AIN A1 TH1 TH2 A2 TH3 TH4 TH5 ADC3 VREF ADC1 2.4V 5 DAC1 ADC2 5 DAC2 6 ENCODE ENCODE INTERNAL TIMING DIGITAL ERROR CORRECTION LOGIC GND DMID OVR DRY D13 MSB D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LSB Figure 1. Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2002–2008 Analog Devices, Inc. All rights reserved. 02647-001 AD6645 www.DataSheet4U.com TABLE OF CONTENTS Features .............................................................................................. 1  Applications ....................................................................................... 1  General Description ......................................................................... 1  Product Highlights ........................................................................... 1  Functional Block Diagram .........................

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