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AD7920BKS-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD7920BKS-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved. AD7910/AD7920* 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70 FEATURES Throughput Rate: 250 kSPS Specified for VDD of 2.35 V to 5.25 V Low Power: 3.6 mW Typ at 250 kSPS with 3 V Supplies 12.5 mW Typ at 250 kSPS with 5 V Supplies Wide Input Bandwidth: 71 dB SNR at 100 kHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High Speed Serial Interface SPI®/QSPI™/MICROWIRE™/DSP Compatible Standby Mode: 1 A Max 6-Lead SC70 Package 8-Lead MSOP Package APPLICATIONS Battery-Powered Systems Personal Digital Assistants Medical Instruments Mobile Communications Instrumentation and Control Systems Data Acquisition Systems High Speed Modems Optical Sensors FUNCTIONAL BLOCK DIAGRAM 10-/12-BIT SUCCESSIVE- APPROXIMATION ADC CONTROL LOGIC AD7910/AD7920 GND VDD VIN SCLK SDATA CS T/H GENERAL DESCRIPTION The AD7910/AD7920 are, respectively, 10-bit and 12-bit, high speed, low power, successive-approximation ADCs. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 250 kSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 13 MHz. The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipeline delays associated with the part. The AD7910/AD7920 use advanced design techniques to achieve very low power dissipation at high throughput rates. The reference for the part is taken internally from VDD. This allows the widest dynamic input range to the ADC. Thus the analog input range for the part is 0 to VDD. The conversion rate is determined by the SCLK. PRODUCT HIGHLIGHTS 1. 10-/12-Bit ADCs in SC70 and MSOP Packages. 2. Low Power Consumption. 3. Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock speed increase. This allows the average power consumption to be reduced when power-down mode is used while not convert- ing. The part also features a power-down mode to maximize power efficiency at lower throughput rates. Current consumption is 1 A max and 50 nA typically when in power-down mode. 4. Reference Derived from the Power Supply. 5. No Pipeline Delay. The parts feature a standard successive-approximation ADC with accurate control of the sampling instant via a CS input and once-off conversion control. *Protected by U.S.Patent No. 6,681,332. |
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