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AD7680 Datasheet(PDF) 1 Page - Analog Devices |
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AD7680 Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page 14-Bit, 500 kSPS PulSAR ADC in MSOP AD7946 Rev. A 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 ©2005–2007 Analog Devices, Inc. All rights reserved. FEATURES 14-bit resolution with no missing codes Throughput: 500 kSPS INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR) SINAD: 85 dB @ 20 kHz THD: −100 dB @ 20 kHz Pseudo differential analog input range 0 V to REF with REF up to VDD No pipeline delay Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Serial interface, SPI/QSPI/MICROWIRE™/DSP compatible Daisy-chain multiple ADCs and BUSY indicator Power dissipation 3.3 mW @ 5 V/100 kSPS 3.3 μW @ 5 V/100 SPS Standby current: 1 nA 10-lead MSOP (MSOP-8 size) and 3 mm × 3 mm QFN (LFCSP) (SOT-23 size) Pin-for-pin compatible with the 16-bit AD7686 APPLICATIONS Battery-powered equipment Data acquisition Instrumentation Medical instruments Process control APPLICATION DIAGRAM AD7946 REF GND VDD IN+ IN– VIO SDI SCK SDO CNV 1.8V TO VDD 3- OR 4-WIRE INTERFACE (SPI, DAISY CHAIN, CS) 0.5V TO 5V 5V 0V TO REF Figure 1. GENERAL DESCRIPTION The AD7946 is a 14-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN−. The reference voltage, REF, is applied externally and can be set up to the supply voltage. Its power scales linearly with throughput. The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus, or it provides an optional BUSY indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO. The AD7946 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C. Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR® ADC Type 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS ADC Driver 14-Bit AD7940 AD79421 AD79461 16-Bit AD7680 AD76851 AD76861 AD79801 ADA4941 AD7683 AD76871 AD76881 AD79831 ADA4841 AD7684 AD7694 AD76931 18-Bit AD76911 AD76901 AD79821 ADA4941 AD79841 ADA4841 1 Pin-for-pin compatible. |
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