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AD7858LARS3 Datasheet(PDF) 1 Page - Analog Devices |
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AD7858LARS3 Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page FUNCTIONAL BLOCK DIAGRAM SAR AND ADC CONTROL CHARGE REDISTRIBUTION DAC BUF 2.5V REFERENCE T/H I/P MUX COMP CALIBRATION MEMORY AND CONTROLLER SERIAL INTERFACE/CONTROL REGISTER AD7858/ AD7858L AVDD AGND AIN1 AIN8 REFIN/REFOUT CREF1 CREF2 CAL SYNC DIN DOUT SCLK DVDD DGND CLKIN CONVST BUSY SLEEP 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 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC AD7858/AD7858L FEATURES Specified for VDD of 3 V to 5.5 V AD7858—200 kSPS; AD7858L—100 kSPS System and Self-Calibration with Autocalibration on Power-Up Eight Single-Ended or Four Pseudo-Differential Inputs Low Power AD7858: 12 mW (VDD = 3 V) AD7858L: 4.5 mW (VDD = 3 V) Automatic Power-Down After Conversion (25 W) Flexible Serial Interface: 8051/SPI™/QSPI™/ P Compatible 24-Lead DIP, SOIC, and SSOP Packages APPLICATIONS Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Pen Computers Instrumentation and Control Systems High-Speed Modems GENERAL DESCRIPTION The AD7858/AD7858L are high-speed, low-power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the AD7858 being optimized for speed and the AD7858L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self-calibration and system calibration options to en- sure accurate operation over time and temperature and have a number of power-down options for low-power applications. The part powers up with a set of default conditions and can operate as a read-only ADC. The AD7858 is capable of 200 kHz throughput rate while the AD7858L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7858/AD7858L voltage range is 0 to VREF with straight binary output coding. Input signal range is to the supply and the part is capable of con- verting full power signals to 100 kHz. CMOS construction ensures low power dissipation of typically 4.5 mW for normal operation and 1.15 mW in power-down mode with a throughput rate of 10 kSPS (VDD = 3 V). The part is available in 24-lead, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC), and 24-lead small shrink outline (SSOP) packages. See page 31 for data sheet index. SPI and QSPI are trademarks of Motorola, Inc. PRODUCT HIGHLIGHTS 1. Specified for 3 V and 5 V supplies. 2. Automatic calibration on power-up. 3. Flexible power management options including automatic power-down after conversion. 4. Operates with reference voltages from 1.2 V to VDD. 5. Analog input range from 0 V to VDD. 6. Eight single-ended or four pseudo-differential input channels. 7. System and self-calibration. 8. Versatile serial I/O port (SPI/QSPI/8051/ µP). 9. Lower power version AD7858L. 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 |
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