AD7274BUJZ-500RL7;AD7273BUJZ-500RL7;AD7273BUJZ-REEL7;AD7273B

FEATURES

Throughput rate: 3 MSPS

Specified for VDD of 2.35 V to 3.6 V Power consumption

11.4 mW at 3 MSPS with 3 V supplies Wide input bandwidth

70 dB SNR at 1 MHz input frequency

Flexible power/serial clock speed management No pipeline delays

High speed serial interface

SPI®-/QSPI -/MICROWIRE -/DSP-compatible Temperature range: 40°C to +125°C Power-down mode: 0.1 μA typ 8-lead TSOT package 8-lead MSOP package

GENERAL DESCRIPTION

The AD7273/AD7274 are 10-/12-bit, high speed, low power, successive approximation ADCs, respectively. The parts operate from a single 2.35 V to 3.6 V power supply and feature throughput rates of up to 3 MSPS. Each part contains a low

noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 55 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 CSpoint. The conversion rate is determined by the SCLK. There are no pipeline delays associated with these parts.

The AD7273/AD7274 use advanced design techniques to achieve very low power dissipation at high throughput rates. The reference for the parts is applied externally and can be in the range of 1.4 V to VDD. This allows the widest dynamic input range to the ADC.

Rev. 0

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3 MSPS,10-/12-Bit ADCs in 8-Lead TSOTAD7273/AD7274

FUNCTIONAL BLOCK DIAGRAM

VVINVREF

SCLK

SDATA1

00-37DGND

940

Figure 1.

Table 1.

Part Number Resolution Package AD727318-Lead TSOT

AD72741

8-Lead TSOT 6-Lead TSOT 6-Lead TSOT 6-Lead TSOT

1

Parts contain external reference pin.

PRODUCT HIGHLIGHTS

1. 3 MSPS ADCs in an 8-lead TSOT package. 2. High throughput with low power consumption.

3. Flexible power/serial clock speed management.

Allows maximum power efficiency at low throughput rates. 4. Reference can be driven up to the power supply. 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.Tel: 781.329.4700 http://www.77cn.com.cn Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.

AD7273/AD7274

TABLE OF CONTENTS

Features..............................................................................................1 General Description.........................................................................1 Functional Block Diagram..............................................................1 Product Highlights...........................................................................1 Revision History...............................................................................2 Specifications.....................................................................................3 AD7274 Specifications.................................................................3 AD7273 Specifications.................................................................5 Timing Specifications..................................................................7 Timing Examples..........................................................................8 Absolute Maximum Ratings............................................................9 ESD Caution..................................................................................9 Pin Configurations and Function Descriptions.........................10 Typical Performance Characteristics...........................................11 Terminology....................................................................................14 Circuit Information........................................................................15 Converter Operation..................................................................15

ADC Transfer Function.............................................................15 Typical Connection Diagram.......................................................16 Analog Input...............................................................................16 Digital Inputs..............................................................................16 Modes of Operation.......................................................................17 Normal Mode..............................................................................17 Partial Power-Down Mode.......................................................17 Full Power-Down Mode............................................................17 Power-Up Times.........................................................................18 Power vs. Throughput Rate.......................................................20 Serial Interface................................................................................21 Microprocessor Interfacing.......................................................23 Application Hints...........................................................................24 Grounding and Layout..............................................................24 Evaluating the AD7273/AD7274 Performance.........................24 Outline Dimensions........................................................... …… 此处隐藏：13726字，全部文档内容请下载后查看。喜欢就下载吧 ……