3 MSPS,10-/12-Bit ADCs in 8-Lead TSOT AD7273/AD7274 FEATURES FUNCTIONAL BLOCK DIAGRAM Throughput rate: 3 MSPS V DD AGND Specified for VDD of 2.35 V to 3.6 V Power consumption 11.4 mW at 3 MSPS with 3 V supplies 10-/12-BIT SUCCESSIVE Wide input bandwidth V T/H IN APPROXIMATION ADC 70 dB SNR at 1 MHz input frequency V REF Flexible power/serial clock speed management No pipeline delays High speed serial interface SCLK SPI-/QSPI-/MICROWIRE-/DSP-compatible SDATA CONTROL Temperature range: 40C to +125C LOGIC CS Power-down mode: 0.1 A typ 8-lead TSOT package AD7273/AD7274 8-lead MSOP package DGND Figure 1. GENERAL DESCRIPTION Table 1. The AD7273/AD7274 are 10-/12-bit, high speed, low power, Part Number Resolution Package successive approximation ADCs, respectively. The parts operate 1 AD7273 10 8-lead MSOP 8-Lead TSOT from a single 2.35 V to 3.6 V power supply and feature 1 AD7274 12 8-lead MSOP 8-Lead TSOT throughput rates of up to 3 MSPS. Each part contains a low AD7276 12 8-lead MSOP 6-Lead TSOT noise, wide bandwidth track-and-hold amplifier that can handle AD7277 10 8-lead MSOP 6-Lead TSOT input frequencies in excess of 55 MHz. AD7278 8 8-lead MSOP 6-Lead TSOT The conversion process and data acquisition are controlled 1 Parts contain external reference pin. using and the serial clock, allowing the devices to interface CS with microprocessors or DSPs. The input signal is sampled on the falling edge of CS, and the conversion is also initiated at this PRODUCT HIGHLIGHTS point. The conversion rate is determined by the SCLK. There 1. 3 MSPS ADCs in an 8-lead TSOT package. are no pipeline delays associated with these parts. 2. High throughput with low power consumption. The AD7273/AD7274 use advanced design techniques to achieve very low power dissipation at high throughput rates. 3. Flexible power/serial clock speed management. Allows maximum power efficiency at low throughput rates. The reference for the parts is applied externally and can be in the range of 1.4 V to V . This allows the widest dynamic input DD 4. Reference can be driven up to the power supply. range to the ADC. 5. No pipeline delay. 6. The parts feature a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once-off conversion control. Rev. 0 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 04973-001AD7273/AD7274 TABLE OF CONTENTS Features .............................................................................................. 1 ADC Transfer Function............................................................. 15 General Description ......................................................................... 1 Typical Connection Diagram ....................................................... 16 Functional Block Diagram .............................................................. 1 Analog Input ............................................................................... 16 Product Highlights ........................................................................... 1 Digital Inputs .............................................................................. 16 Revision History ............................................................................... 2 Modes of Operation ....................................................................... 17 Specifications..................................................................................... 3 Normal Mode.............................................................................. 17 AD7274 Specifications................................................................. 3 Partial Power-Down Mode ....................................................... 17 AD7273 Specifications................................................................. 5 Full Power-Down Mode ............................................................ 17 Timing Specifications .................................................................. 7 Power-Up Times......................................................................... 18 Timing Examples.......................................................................... 8 Power vs. Throughput Rate....................................................... 20 Absolute Maximum Ratings............................................................ 9 Serial Interface ................................................................................ 21 ESD Caution.................................................................................. 9 Microprocessor Interfacing....................................................... 23 Pin Configurations and Function Descriptions ......................... 10 Application Hints ........................................................................... 24 Typical Performance Characteristics ........................................... 11 Grounding and Layout .............................................................. 24 Terminology .................................................................................... 14 Evaluating the AD7273/AD7274 Performance......................... 24 Circuit Information........................................................................ 15 Outline Dimensions ....................................................................... 25 Converter Operation.................................................................. 15 Ordering Guide .......................................................................... 25 REVISION HISTORY 9/05Revision 0: Initial Version Rev. 0 Page 2 of 28