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AD6644ASTZ-40 датащи(PDF) 1 Page - Analog Devices |
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AD6644ASTZ-40 датащи(HTML) 1 Page - Analog Devices |
1 / 25 page 14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter AD6644 Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2007 Analog Devices, Inc. All rights reserved. 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 APPLICATIONS Multichannel, multimode receivers AMPS, IS-136, CDMA, GSM, WCDMA Single channel digital receivers Antenna array processing Communications instrumentation Radar, infrared imaging Instrumentation GENERAL 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. FUNCTIONAL BLOCK DIAGRAM 5 6 5 AD6644 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. |
Аналогичный номер детали - AD6644ASTZ-40 |
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Аналогичное описание - AD6644ASTZ-40 |
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