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EVAL-AD7643CB Datasheet(PDF) 1 Page - Analog Devices |
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EVAL-AD7643CB Datasheet(HTML) 1 Page - Analog Devices |
1 / 29 page 18-Bit, 1.25 MSPS PulSAR® ADC AD7643 Rev. 0 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Throughput: 1.25 MSPS INL: ±1.5 LSB typical, ±3 LSB maximum (±11 ppm of full scale) 18-bit resolution with no missing codes Dynamic range: 95 dB typical SINAD: 93.5 dB typical @ 20 kHz (VREF = 2.5 V) THD: −113 dB typical @ 20 kHz (VREF = 2.5 V) 2.048 V internal reference: typical drift 8 ppm/°C; TEMP output Differential input range: ±VREF (VREF up to 2.5 V) No pipeline delay (SAR architecture) Parallel (18-, 16-, or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface SPI®/QSPI™/MICROWIRE™/DSP compatible Single 2.5 V supply operation Power dissipation 65 mW typical @ 1.25 MSPS with internal REF 2 μW in power-down mode Pb-free, 48-lead LQFP and 48-lead LFCSP_VQ Pin compatible with the AD7641 and other PulSAR ADC’s APPLICATIONS Medical instruments High speed data acquisition/high dynamic data acquisition Digital signal processing Spectrum analysis Instrumentation Communications ATE GENERAL DESCRIPTION The AD7643 is an 18-bit, 1.25 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part contains a high speed, 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. The part has no latency and can be used in asynchronous rate applications. The AD7643 is hardware factory calibrated and tested to ensure ac parameters, such as signal-to-noise ratio (SNR), in addition to the more traditional dc parameters of gain, offset, and linearity. The AD7643 is only available in Pb-free packages with operation specified from −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM 18 CONTROL LOGIC AND CALIBRATION CIRCUITRY CLOCK AD7643 DGND DVDD AVDD AGND REF REFGND IN+ IN– PD RESET PDBUF REFBUFIN PDREF REF TEMP D[17:0] BUSY RD CS D0/OB/2C OGND OVDD MODE1 MODE0 REF AMP CNVST SERIAL PORT PARALLEL INTERFACE SWITCHED CAP DAC Figure 1. Table 1. PulSAR 48-Lead Selection Type/kSPS 100 to 250 500 to 570 650 to 1000 >1000 Pseudo Differential AD7651, AD7660, AD7661 AD7650, AD7652, AD7664, AD7666 AD7653, AD7667 True Bipolar AD7610, AD7663 AD7665 AD7612, AD7671 True Differential AD7675 AD7676 AD7677 AD7621, AD7622, AD7623 18-Bit Multichannel/ AD7631, AD7678 AD7679 AD7634, AD7674 AD7641, AD7643 Simultaneous AD7654 AD7655 PRODUCT HIGHLIGHTS 1. Fast Throughput. The AD7643 is a 1.25 MSPS, charge redistribution, 18-bit SAR ADC. 2. Superior Linearity. The AD7643 has no missing 18-bit code. 3. Internal Reference. The AD7643 has a 2.048 V internal reference with a typical drift of ±8 ppm/°C and an on-chip TEMP sensor. 4. Single-Supply Operation. The AD7643 operates from a 2.5 V single supply. 5. Serial or Parallel Interface. Versatile parallel (18-, 16-, or 8-bit bus) or 2-wire serial interface arrangement compatible with 2.5 V, 3.3 V, or 5 V logic. |
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