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AD6645ASVZ-80 Folha de dados(PDF) 1 Page - Analog Devices |
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AD6645ASVZ-80 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 24 page 14-Bit, 80 MSPS/105 MSPS A/D Converter AD6645 Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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. 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 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 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. 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. 2. Pin Compatibility. The ADC has the same footprint and pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC. 3. 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. FUNCTIONAL BLOCK DIAGRAM 5 6 5 AD6645 AIN AIN VREF ENCODE ENCODE GND DMID OVR DRY D13 MSB D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LSB ADC3 TH5 TH4 DAC2 ADC2 TH3 A2 DAC1 DIGITAL ERROR CORRECTION LOGIC TH2 ADC1 TH1 A1 2.4V INTERNAL TIMING DVCC AVCC Figure 1. |
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