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AD7865YS-3 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7865YS-3 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 19 page REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7865 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC FEATURES Fast (2.4 s) 14-Bit ADC Four Simultaneously Sampled Inputs Four Track/Hold Amplifiers 0.35 s Track/Hold Acquisition Time 2.4 s Conversion Time per Channel HW/SW Select of Channel Sequence for Conversion Single Supply Operation Selection of Input Ranges: 10 V, 5 V and 2.5 V, 0 V to 5 V and 0 V to 2.5 V High Speed Parallel Interface Which Also Allows Interfacing to 3 V Processors Low Power, 115 mW Typ Power Saving Mode, 15 W Typ Overvoltage Protection on Analog Inputs APPLICATIONS AC Motor Control Uninterruptible Power Supplies Industrial Power Meters/Monitors Data Acquisition Systems Communications GENERAL DESCRIPTION The AD7865 is a fast, low power, four-channel simultaneous sampling 14-bit A/D converter that operates from a single 5 V supply. The part contains a 2.4 µs successive approximation ADC, four track/hold amplifiers, 2.5 V reference, on-chip clock oscillator, signal conditioning circuitry and a high speed parallel interface. The input signals on four channels are sampled simul- taneously thus preserving the relative phase information of the signals on the four analog inputs. The part accepts analog input ranges of ±10 V, ±5 V, ±2.5 V, 0 V to 2.5 V and 0 V to 5 V. The part allows any subset of the four channels to be converted in order to maximize the throughput rate on the selected sequence. The channels to be converted can be selected either via hard- ware (channel select input pins) or via software (programming the channel select register). A single conversion start signal ( CONVST) simultaneously places all the track/holds into hold and initiates conversion sequence 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. Data is read from the part via a 14-bit parallel data bus using the standard CS and RD signals. Maximum throughput for a single channel is 350 kSPS. For all four channels the maximum through- put is 100 kSPS. The AD7865 is available in a small (0.3 sq. inch area) 44-lead PQFP. PRODUCT HIGHLIGHTS 1. The AD7865 features four Track/Hold amplifiers and a fast (2.4 µs) ADC allowing simultaneous sampling and then con- version of any subset of the four channels. 2. The AD7865 operates from a single 5 V supply and con- sumes only 115 mW typ, making it ideal for low power and portable applications. 3. The part offers a high speed parallel interface for easy con- nection to microprocessors, microcontrollers and digital signal processors. 4. The part is offered in three versions with different analog input ranges. The AD7865-1 offers the standard industrial ranges of ±10 V and ±5 V; the AD7865-2 offers a unipolar range of 0 V to 2.5 V or 0 V to 5 V and the AD7865-3 offers the common signal processing input range of ±2.5 V. 5. The part features very tight aperture delay matching between the four input sample and hold amplifiers. FUNCTIONAL BLOCK DIAGRAM SIGNAL SCALING SIGNAL SCALING SIGNAL SCALING SIGNAL SCALING FRSTDATA AGND CHANNEL SELECT REGISTER MUX DB0–DB3 +2.5V REFERENCE TRACK/HOLD 4 6k AD7865 EOC VDRIVE RD CLK IN /SL1 INT/EXT CLK/SL2 SL3 SL4 H/S SEL DGND AVDD VREF AGND CONVST BUSY DB13 DVDD VIN4A VIN3B VIN3A VIN2B VIN1B STBY VREFAGND AGND VIN1A VIN2A 14-BIT ADC CONVERSION CONTROL LOGIC INT CLOCK INT/EXT CLOCK SELECT OUTPUT LATCH WR CS DB0 VIN4B |
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