AD7994-0 datasheet, PDF - EEWORLD Datasheet

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AD7994-0: Description4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop; File Size684KB，32 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD7994-0 Overview

4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop

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4-Channel, 10- and 12-Bit ADCs with I

C-

Compatible Interface in 16-Lead TSSOP

AD7993/AD7994

FEATURES

10- and 12-bit ADC with fast conversion time: 2 µs typ

4 single-ended analog input channels

Specified for V

of 2.7 V to 5.5 V

Low power consumption

Fast throughput rate: 188 kSPS

Temperature range:−40°C to +125°C

Sequencer operation

Automatic cycle interval mode

C®-compatible serial interface

C interface supports standard, fast, and high speed modes

Out-of-range indicator/alert function

Pin-selectable addressing via AS

Shutdown mode: 1 µA max

16-lead TSSOP package

See

AD7998

and

AD7992

for 8-channel and 2-channel

equivalent devices, respectively.

FUNCTIONAL BLOCK DIAGRAM

AGND

REF

CONVST

AD7993/AD7994

T/H

I/P

MUX

10-/12-BIT

SUCCESSIVE

APPROXIMATION

ADC

CONTROL

LOGIC

OSCILLATOR

DATA

LOW

LIMIT

CONVERSION

RESULT

CONFIGURATION

ALERT STATUS

CYCLE TIMER

C INTERFACE

SCL

SDA

03472-0-001

DATA

HIGH

LIMIT

ALERT/

BUSY

HYSTERESIS

GENERAL DESCRIPTION

The AD7993/AD7994 are 4-channel, 10- and 12-bit, low power,

successive approximation ADCs with an I

C-compatible inter-

face. The parts operate from a single 2.7 V to 5.5 V power

supply and feature a 2 µs conversion time. The parts contain a

4-channel multiplexer and track-and-hold amplifier that can

handle input frequencies up to 11 MHz.

The AD7993/AD7994 provide a 2-wire serial interface that is

compatible with I

C interfaces. Each part comes in two versions,

AD7993-0/AD7994-0 and AD7993-1/AD7994-1, and each

version allows for at least two different I

C addresses. The I

interface on the AD7993-0/AD7994-0 supports standard and

fast I

C interface modes. The I

C interface on the AD7993-1/

AD7994-1 supports standard, fast, and high speed I

C interface

modes.

The AD7993/AD7994 normally remain in a shutdown state

while not converting, and power up only for conversions. The

conversion process can be controlled using the CONVST pin,

by a command mode where conversions occur across I

C write

operations, or an automatic conversion interval mode selected

through software control.

The AD7993/AD7994 require an external reference that should

be applied to the REF

pin and can be in the range of 1.2 V to

. This allows the widest dynamic input range to the ADC.

AGND

Figure 1.

On-chip limit registers can be programmed with high and low

limits for the conversion result, and an open-drain, out-of-

range indicator output (ALERT) becomes active when the

programmed high or low limits are violated by the conversion

result. This output can be used as an interrupt.

PRODUCT HIGHLIGHTS

2 µs conversion time with low power consumption.

C-compatible serial interface with pin-selectable

addresses. Two AD7993/AD7994 versions allow five

AD7993/AD7994 devices to be connected to the same

serial bus.

The parts feature automatic shutdown while not converting

to maximize power efficiency. Current consumption is

1 µA max when in shutdown mode.

Reference can be driven up to the power supply.

Out-of-range indicator that can be software disabled or

enabled.

One-shot and automatic conversion rates.

Registers can store minimum and maximum conversion

results.

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 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

Fax: 781.326.8703

AD7993/AD7994

TABLE OF CONTENTS

AD7993 Specifications..................................................................... 3

AD7994 Specifications..................................................................... 5

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

Absolute Maximum Ratings............................................................ 9

ESD Caution.................................................................................. 9

Pin Configuration and Pin Function Descriptions.................... 10

Terminology .................................................................................... 11

Typical Performance Characteristics ........................................... 12

Circuit Information ........................................................................ 15

Converter Operation.................................................................. 15

Typical Connection Diagram ................................................... 16

Analog Input ............................................................................... 16

Internal Register Structure ............................................................ 18

Address Pointer Register ........................................................... 18

Configuration Register .............................................................. 19

Conversion Result Register ....................................................... 20

Limit Registers ............................................................................ 20

Alert Status Register................................................................... 21

Cycle Timer Register.................................................................. 22

Sample Delay and Bit Trial Delay............................................. 22

Serial Interface ................................................................................ 23

Serial Bus Address...................................................................... 23

Writing to the AD7993/AD7994 .................................................. 24

Writing to the Address Pointer Register for a Subsequent

Read.............................................................................................. 24

Writing a Single Byte of Data to the Alert Status Register or

Cycle Register.............................................................................. 24

Writing Two Bytes of Data to a Limit or Hysteresis

Reading Data from the AD7993/AD7994................................... 26

Alert/Busy Pin................................................................................. 27

SMBus Alert ................................................................................ 27

Busy .............................................................................................. 27

Placing the AD7993-1/AD7994-1 into High Speed Mode ... 27

The Address Select (AS) Pin ..................................................... 27

Modes of Operation ....................................................................... 28

Mode 1—Using the CONVST Pin ........................................... 28

Mode 2—Command Mode....................................................... 29

Mode 3—Automatic Cycle Interval Mode.............................. 30

Outline Dimensions ....................................................................... 31

Ordering Guide .......................................................................... 31

Related Parts in I

C-Compatible ADC Product Family........ 31

REVISION HISTORY

10/04—Revision 0: Initial Version

Rev. 0 | Page 2 of 32

AD7994-0 Related Products

	AD7994-0	AD7993-1	AD7994-X	AD7994	AD7994BRU-1REEL	AD7993-0	AD7994-1	AD7993-X
Description	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop	4-channel, 10- and 12-bit adcs with i2c compatible interface in 16-lead tssop

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