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AD7864BSZ-12 Fiches technique(PDF) 1 Page - Analog Devices |
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AD7864BSZ-12 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 28 page 4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC AD7864 Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalog Devices foritsuse,nor for anyinfringements ofpatents orother 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 ©1998–2009 Analog Devices, Inc. All rights reserved. FEATURES High speed (1.65 μs) 12-bit ADC 4 simultaneously sampled inputs 4 track-and-hold amplifiers 0.35 μs track-and-hold acquisition time 1.65 μs conversion time per channel HW/SW select of channel sequence for conversion Single-supply operation Selection of input ranges ±10 V, ±5 V for AD7864-1 ±2.5 V for AD7864-3 0 V to 2.5 V, 0 V to 5 V for AD7864-2 High speed parallel interface that allows Interfacing to 3 V processors Low power, 90 mW typical Power saving mode, 20 μW typical Overvoltage protection on analog inputs APPLICATIONS AC motor control Uninterrupted power supplies Data acquisition systems Communications GENERAL DESCRIPTION The AD7864 is a high speed, low power, 4-channel, simulta- neous sampling 12-bit analog-to-digital converter (ADC) that operates from a single 5 V supply. The part contains a 1.65 μs successive approximation ADC, four track-and-hold amplifiers, a 2.5 V reference, an on-chip clock oscillator, signal conditioning circuitry, and a high speed parallel interface. The input signals on four channels sample simultaneously preserving the relative phase information of the signals on the four analog inputs. The part accepts analog input ranges of ±10 V, ±5 V (AD7864-1), 0 V to +2.5 V, 0 V to +5 V (AD7864-2), and ±2.5 V (AD7864-3). Any subset of the four channels can be converted to maximize the throughput rate on the selected sequence. Select the channels to convert via hardware (channel select input pins) or software (pro- gramming the channel select register). A single conversion start signal (CONVST) simultaneously places all the track-and-holds into hold and initiates a conversion se- quence for the selected channels. The EOC signal indicates the end of each individual conversion in the selected conversion sequence. The BUSY signal indicates the end of the conversion sequence. FUNCTIONAL BLOCK DIAGRAM STBY FRSTDATA INT/EXT CLOCK SELECT OUTPUT DATA REGISTERS 2.5V REFERENCE SIGNAL SCALING VIN1A VIN1B VIN2A VIN2B VIN3A VIN3B VIN4A VIN4B BUSY SIGNAL SCALING SIGNAL SCALING SIGNAL SCALING TRACK-AND-HOLD ×4 EOC WR CS DB0 DB11 RD AGND DGND VDRIVE DVDD VREFGND VREF AVDD 6kΩ AD7864 12-BIT ADC SOFTWARE LATCH CONVERSION CONTROL LOGIC MUX CONVST SL2 SL1 SL3 SL4 H/S SEL CLKIN INT/EXT CLK AGND AGND INT CLOCK DB0 TO DB3 Figure 1. Data is read from the part by a 12-bit parallel data bus using the standard CS and RD signals. Maximum throughput for a single channel is 500 kSPS. For all four channels, the maximum throughput is 130 kSPS for the read-during-conversion sequence operation. The throughput rate for the read-after-conversion sequence operation depends on the read cycle time of the processor. See the section. The AD7864 is available in a small (0.3 square inch area) 44-lead MQFP. Timing and Control PRODUCT HIGHLIGHTS 1. Four track-and-hold amplifiers and a fast (1.65 μs) ADC for simultaneous sampling and conversion of any subset of the four channels. 2. A single 5 V supply consuming only 90 mW typical, makes it ideal for low power and portable applications. See the Standby Mode Operation section. 3. High speed parallel interface for easy connection to micro- processors, microcontrollers, and digital signal processors. 4. Available in three versions with different analog input ranges. The AD7864-1 offers the standard industrial input ranges of ±10 V and ±5 V; the AD7864-3 offers the common signal processing input range of ±2.5 V; the AD7864-2 can be used in unipolar, 0 V to 2.5 V and 0 V to 5 V, applications. 5. Features very tight aperture delay matching between the four input sample-and-hold amplifiers. |
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