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AD7476SRTZ-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD7476SRTZ-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page REV. D 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. AD7476/AD7477/AD7478* 1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SOT-23 *Protected by U.S.Patent No. 6,681,332. FEATURES Fast Throughput Rate: 1 MSPS Specified for VDD of 2.35 V to 5.25 V Low Power: 3.6 mW Typ at 1 MSPS with 3 V Supplies 15 mW Typ at 1 MSPS with 5 V Supplies Wide Input Bandwidth: 70 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 SOT-23 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 T/H AD7476/AD7477/AD7478 SCLK SDATA CS VIN VDD GND 8-/10-/12-BIT SUCCESSIVE- APPROXIMATION ADC CONTROL LOGIC GENERAL DESCRIPTION The AD7476/AD7477/AD7478 are, respectively, 12-bit, 10-bit, and 8-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 1 MSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 6 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 AD7476/AD7477/AD7478 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 V to VDD. The conversion rate is determined by the SCLK. PRODUCT HIGHLIGHTS 1. First 12-/10-/8-Bit ADCs in a SOT-23 Package. 2. High Throughput with 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 while not converting. The part also features a shutdown mode to maximize power efficiency at lower throughput rates. Current consumption is 1 µA maximum when in shutdown. 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. |
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