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AD7262BCPZ-5 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7262BCPZ-5 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 33 page 1 MSPS, 12-Bit, Simultaneous Sampling SAR ADC with PGA and Four Comparators Data Sheet AD7262 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property oftheir respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2008–2016 Analog Devices, Inc. All rights reserved. Technica l Support www.analog.com FEATURES Dual simultaneous sampling 12-bit, 2-channel analog-to- digital converter (ADC) True differential analog inputs Programmable gain stage: ×1, ×2, ×3, ×4, ×6, ×8, ×12, ×16, ×24, ×32, ×48, ×64, ×96, ×128 Throughput rate per ADC 1 MSPS for AD7262 500 kSPS for AD7262-5 Analog input impedance: >1 GΩ Wide input bandwidth −3 dB bandwidth: 1.7 MHz at gain = 2 4 on-chip comparators SNR: 73 dB typical at gain = 2, 66 dB typical at gain = 32 Device offset calibration, system gain calibration On-chip reference: 2.5 V −40°C to +105°C operation High speed serial interface SPI/QSPI™/MICROWIRE/DSP compatible 48-lead LFCSP and LQFP GENERAL DESCRIPTION The AD7262/AD7262-5 are dual, 12-bit, high speed, low power, successive approximation ADCs that operate from a single 5 V power supply. The AD7262 features throughput rates of up to 1 MSPS per on-chip ADC.The AD7262-5 features throughput rates of up to 500 kSPS. Two complete ADC functions allow simultaneous sampling and conversion of two channels. Each ADC is preceded by a true differential analog input with a PGA. There are 14 gain settings available: ×1, ×2, ×3, ×4, ×6, ×8, ×12, ×16, ×24, ×32, ×48, ×64, ×96, and ×128. The AD7262/AD7262-5 containfour comparators. Comparator A and Comparator B are optimized for low power, while Compara- tor C and Comparator D have fast propagation delays. The AD7262/AD7262-5 feature a calibration function to remove any device offset error and programmable gainadjustregisters to allow for input path (for example,sensor) offset and gaincompensation. The AD7262/AD7262-5 have an on-chip 2.5 V reference that can be disabled if an external referenceis preferred. The AD7262/AD7262-5 are ideally suited for monitoring small amplitude signals from a variety of sensors. They include all the functionalityneeded for monitoring thepositionfeedbacksignals from a variety ofanalog encoders used in motor control systems. FUNCTIONAL BLOCK DIAGRAM AGND DGND DOUTB PD1 PD0/DIN PD2 VREFA AVCC VA+ VA– VB+ VB– CB+ CB– CA+ CA– CD+ CD– CC+ CC– VREFB CA_CBVCC CA_CB_GND CC_CDVCC CC_CD_GND COMP COMP COMP COMP COUTC COUTB COUTA COUTD DOUTA PGA T/H BUF T/H BUF PGA 12-BIT SUCCESSIVE APPROXIMATION ADC REF 12-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC OUTPUT DRIVERS OUTPUT DRIVERS OUTPUT DRIVERS OUTPUT DRIVERS VDRIVE G3 G2 G1 G0 CAL CS SCLK REFSEL AD7262 OUTPUT DRIVERS OUTPUT DRIVERS Figure 1. PRODUCT HIGHLIGHTS 1. Integrated PGA with a variety of flexible gain settings to allow detection and conversion of low level analog signals. 2. Each PGA is followed by a dual simultaneous sampling ADC, featuring throughput rates of 1 MSPS per ADC for the AD7262. The conversion results of both ADCs are simultaneouslyavailable on separate datalines or in succes- sion on one data line if onlyoneserial port is available. 3. Four integrated comparators that can be used to count signals from pole sensors in motor control applications. 4. Internal 2.5 V reference. |
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