EVAL-AD7933CB datasheet, PDF - EEWORLD Datasheet

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EVAL-AD7933CB: Description4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer; File Size605KB，32 Pages; ManufacturerADI; Websitehttps://www.analog.com

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EVAL-AD7933CB Overview

4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

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4-Channel, 1.5 MSPS, 10-Bit and 12-Bit

Parallel ADCs with a Sequencer

AD7933/AD7934

FEATURES

Throughput rate: 1.5 MSPS

Specified for V

of 2.7 V to 5.25 V

Low power

6 mW maximum at 1.5 MSPS with 3 V supplies

13.5 mW maximum at 1.5 MSPS with 5 V supplies

4 analog input channels with a sequencer

Software configurable analog inputs

4-channel single-ended inputs

2-channel fully differential inputs

2-channel pseudo differential inputs

Accurate on-chip 2.5 V reference

±0.2% maximum @ 25°C, 25 ppm/°C maximum (AD7934)

70 dB SINAD at 50 kHz input frequency

No pipeline delays

High speed parallel interface—word/byte modes

Full shutdown mode: 2 μA maximum

28-lead TSSOP package

FUNCTIONAL BLOCK DIAGRAM

REFIN/

2.5V

VREF

12-/10-BIT

SAR ADC

AND

CONTROL

CLKIN

CONVST

BUSY

AGND

AD7933/AD7934

REFOUT

I/P

MUX

T/H

SEQUENCER

PARALLEL INTERFACE/CONTROL REGISTER

DRIVE

DB0 DB11

CS RD WR W/B

DGND

Figure 1.

GENERAL DESCRIPTION

The AD7933/AD7934 are 10-bit and 12-bit, high speed, low

power, successive approximation (SAR) analog-to-digital

converters (ADCs). The parts operate from a single 2.7 V to

5.25 V power supply and feature throughput rates up to 1.5 MSPS.

The parts contain a low noise, wide bandwidth, differential track-

and-hold amplifier that handles input frequencies up to 50 MHz.

The AD7933/AD7934 feature four analog input channels with a

channel sequencer that allows a preprogrammed selection of

channels to be sequentially converted. These parts can accept

either single-ended, fully differential, or pseudo differential

analog inputs.

The conversion process and data acquisition are controlled

using standard control inputs that allow for easy interfacing to

microprocessors and DSPs. The input signal is sampled on the

falling edge of CONVST, and the conversion is also initiated at

this point.

The AD7933/AD7934 has an accurate on-chip 2.5 V reference

that is used as the reference source for the analog-to-digital

conversion. Alternatively, this pin can be overdriven to provide

an external reference.

These parts use advanced design techniques to achieve very low

power dissipation at high throughput rates. They also feature

flexible power management options. An on-chip control

including analog input range and configuration, output coding,

power management, and channel sequencing.

PRODUCT HIGHLIGHTS

High throughput with low power consumption.

Four analog inputs with a channel sequencer.

Accurate on-chip 2.5 V reference.

Single-ended, pseudo differential or fully differential

analog inputs that are software selectable.

Single-supply operation with V

DRIVE

function.

The V

DRIVE

function allows the parallel interface to connect

directly to 3 V or 5 V processor systems independent of V

No pipeline delay.

Accurate control of the sampling instant via a CONVST

input and once-off conversion control.

Table 1. Related Devices

Device

AD7938/AD7939

AD7938-6

AD7934-6

No. of Bits

12/10

No. of Channels

Speed

1.5 MSPS

625 kSPS

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. Specifications subject to change without notice. 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

03713-001

AD7933/AD7934

TABLE OF CONTENTS

Features .............................................................................................. 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Product Highlights ........................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

AD7933 Specifications................................................................. 3

AD7934 Specifications................................................................. 5

Timing Specifications .................................................................. 7

Absolute Maximum Ratings............................................................ 8

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

Typical Performance Characteristics ........................................... 11

Terminology .................................................................................... 13

Control Register.............................................................................. 15

Sequencer Operation ................................................................. 16

Circuit Information ........................................................................ 17

Converter Operation.................................................................. 17

ADC Transfer Function............................................................. 17

Typical Connection Diagram ................................................... 18

Analog Input Structure.............................................................. 18

Analog Inputs ............................................................................. 19

Analog Input Selection .............................................................. 21

Reference ..................................................................................... 22

Parallel Interface......................................................................... 23

Power Modes of Operation ....................................................... 26

Power vs. Throughput Rate....................................................... 27

Microprocessor Interfacing....................................................... 27

Application Hints ........................................................................... 29

Grounding and Layout .............................................................. 29

Evaluating the AD7933/AD7934 Performance...................... 29

Outline Dimensions ....................................................................... 30

Ordering Guide .......................................................................... 30

REVISION HISTORY

2/07—Rev. A to Rev B

Changes to Timing Specifications .................................................. 7

Changes to Figure 13...................................................................... 12

12/05—Rev. 0 to Rev. A

Replaced Figures .................................................................Universal

Changes to General Description .................................................... 1

Changes to Product Highlights....................................................... 1

Added Table 1.................................................................................... 1

Changes to Specifications Section.................................................. 3

Changes to Table 5............................................................................ 9

Changes to Terminology Section.................................................. 13

Changes to Control Register Section ........................................... 15

Changes to Circuit Information Section ..................................... 17

Changes to Application Hints Section......................................... 29

1/05—Revision 0: Initial Version

Rev. B | Page 2 of 32

EVAL-AD7933CB Related Products

	EVAL-AD7933CB	EVAL-AD7934CB	AD7934
Description	4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer	4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer	4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

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