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AD7949 데이터시트(PDF) 1 Page - Analog Devices |
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AD7949 데이터시트(HTML) 1 Page - Analog Devices |
1 / 28 page 16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC AD7682/AD7689 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES 16-bit resolution with no missing codes 4-channel (AD7682)/8-channel (AD7689) multiplexer with choice of inputs Unipolar single ended Differential (GND sense) Pseudobipolar Throughput: 250 kSPS INL: ±0.5 LSB typical, ± 1.5 LSB maximum (±23 ppm or FSR) Dynamic range: 93.8 dB SINAD: 92.5 dB @ 20 kHz THD: −100 dB @ 20 kHz Analog input range: 0 V to VREF with VREF up to VDD Multiple reference types Internal selectable 2.5 V or 4.096 V External buffered (up to 4.096 V) External (up to VDD) Internal temperature sensor Channel sequencer, selectable 1-pole filter, busy indicator No pipeline delay, SAR architecture Single-supply 2.7 V to 5.5 V operation with 1.8 V to 5 V logic interface Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP Power dissipation 3.5 mW @ 2.5 V/200 kSPS 12 mW @ 5 V/250 kSPS Standby current: 50 nA 20-lead 4 mm × 4 mm LFCSP package APPLICATIONS Battery-powered equipment Medical instruments: ECG/EKG Mobile communications: GPS Personal digital assistants Power line monitoring Data acquisition Seismic data acquisition systems Instrumentation Process control FUNCTIONAL BLOCK DIAGRAM AD7682/ AD7689 REF GND VDD VIO DIN SCK SDO CNV 1.8V TO VDD 2.7V TO 5V SEQUENCER SPI SERIAL INTERFACE MUX 16-BIT SAR ADC BAND GAP REF TEMP SENSOR REFIN IN0 IN1 IN4 IN5 IN6 IN7 IN3 IN2 COM 0.5V TO VDD 22µF ONE-POLE LPF 0.5V TO 4.096V 0.1µF Figure 1. Table 1. Multichannel 14-/16-Bit PulSAR® ADC Type Channels 250 kSPS 500 kSPS ADC Driver 14-Bit 8 AD7949 ADA4841-x 16-Bit 4 AD7682 ADA4841-x 16-Bit 8 AD7689 AD7699 ADA4841-x GENERAL DESCRIPTION The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analog- to-digital converters (ADCs) that operate from a single power supply, VDD. The AD7682/AD7689 contain all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; a 4-channel (AD7682) or 8-channel (AD7689), low crosstalk multiplexer useful for configuring the inputs as single ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order. The AD7682/AD7689 use a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput. Each AD7682/AD7689 is housed in a tiny 20-lead LFCSP with operation specified from −40°C to +85°C. |
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