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AD7484 Fiches technique(PDF) 1 Page - Analog Devices |
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AD7484 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page 3 MSPS, 14-Bit SAR ADC AD7484 Rev. C 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 ©2002–2009 Analog Devices, Inc. All rights reserved. FEATURES Fast throughput rate: 3 MSPS Wide input bandwidth: 40 MHz No pipeline delays with SAR ADC Excellent dc accuracy performance 2 parallel interface modes Low power: 90 mW (full power) and 2.5 mW (nap mode) Standby mode: 2 μA maximum Single 5 V supply operation Internal 2.5 V reference Full-scale overrange mode (using 15th bit) System offset removal via user access offset register Nominal 0 V to 2.5 V input with shifted range capability Pin compatible upgrade of 12-bit AD7482 FUNCTIONAL BLOCK DIAGRAM 2.5V REFERENCE NAP MODE2 BUF T/H AVDD AGND CBIAS DVDD DGND REFSEL REFOUT REFIN VIN 14-BIT ALGORITHMIC SAR MODE1 CLIP STBY RESET CONVST D14 D13 D12 D11 D10 D9 D8 CONTROL LOGIC AND I/O REGISTERS D7 AD7484 VDRIVE Figure 1. GENERAL DESCRIPTION The AD7484 is a 14-bit, high speed, low power, successive approximation ADC. The part features a parallel interface with throughput rates up to 3 MSPS. The part contains a low noise, wide bandwidth track-and-hold that can handle input frequencies in excess of 40 MHz. The conversion process is a proprietary algorithmic successive approximation technique that results in no pipeline delays. The input signal is sampled, and a conversion is initiated on the falling edge of the CONVST signal. The conversion process is controlled by an internally trimmed oscillator. Interfacing is via standard parallel signal lines, making the part directly compatible with microcontrollers and DSPs. The AD7484 provides excellent ac and dc performance specifica- tions. Factory trimming ensures high dc accuracy, resulting in very low INL, offset, and gain errors. The part uses advanced design techniques to achieve very low power dissipation at high throughput rates. Power consumption in the normal mode of operation is 90 mW. There are two power saving modes: a nap mode, which keeps the reference circuitry alive for a quick power-up while consuming 2.5 mW, and a standby mode that reduces power consumption to a mere 10 μW. The AD7484 features an on-board 2.5 V reference but can also accommodate an externally provided 2.5 V reference source. The nominal analog input range is 0 V to 2.5 V, but an offset shift capability allows this nominal range to be offset by ±200 mV. This allows the user considerable flexibility in setting the bottom end reference point of the signal range, a useful feature when using single-supply op amps. The AD7484 also provides an 8% overrange capability via a 15th bit. Therefore, if the analog input range strays outside the nominal range by up to 8%, the user can still accurately resolve the signal by using the 15th bit. The AD7484 is powered by a 4.75 V to 5.25 V supply. The part also provides a VDRIVE pin that allows the user to set the voltage levels for the digital interface lines. The range for this VDRIVE pin is 2.7 V to 5.25 V. The part is housed in a 48-lead LQFP package and is specified over a −40°C to +85°C temperature range. |
Numéro de pièce similaire - AD7484 |
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Description similaire - AD7484 |
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