AD7991 datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > semiconductor> logic> AD7991

AD7991: Description4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8; Categorysemiconductor logic; File Size627KB，27 Pages; ManufacturerADI; Websitehttps://www.analog.com

Download Datasheet Download user manual Parametric View All

AD7991 Overview

4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8

AD7991 Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	8
Maximum operating temperature	125 Cel
Minimum operating temperature	-40 Cel
Rated supply voltage	3.3 V
Maximum linear error	0.0244 %
Maximum limit analog input voltage	5.5 V
Minimum limit analog input voltage	0.0 V
Processing package description	ROHS COMPLIANT, MO-178-BA, SOT-23, 8 PIN
state	ACTIVE
packaging shape	RECTANGULAR
Package Size	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
surface mount	Yes
Terminal form	GULL WING
Terminal spacing	0.6500 mm
terminal coating	NICKEL PALLADIUM GOLD
Terminal location	DUAL
Packaging Materials	PLASTIC/EPOXY
Temperature level	AUTOMOTIVE
Output format	SERIAL
Type of converter	SUCCESSIVE APPROXIMATION
Number of digits	12
Output bit encoding	BINARY
Number of analog channels	4
Sample and hold and track and hold	TRACK

User Manual

Preview

Download Datasheet

View All

Data Sheet

FEATURES

4-Channel, 12-/10-/8-Bit ADC with

C-Compatible Interface in 8-Lead SOT-23

AD7991/AD7995/AD7999

FUNCTIONAL BLOCK DIAGRAM

12-/10-/8-bit ADCs with fast conversion time: 1 µs typical

4 analog input channels/3 analog input channels with

reference input

Specified for V

of 2.7 V to 5.5 V

Sequencer operation

Temperature range: −40°C to +125°C

C-compatible serial interface supports standard, fast,

and high speed modes

2 versions allow 2 I

C addresses

Low power consumption

Shutdown mode: 1 µA maximum

8-lead SOT-23 package

Qualified for automotive applications

IN0

IN1

IN2

IN3

REF

CONTROL

LOGIC AND

INTERFACE

I/P

MUX

T/H

12-/10-/8-BIT

SAR

ADC

SCL

SDA

GND

APPLICATIONS

System monitoring

Battery-powered systems

Data acquisition

Medical instruments

Figure 1.

GENERAL DESCRIPTION

The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power,

successive approximation ADCs with an I

C®-compatible interface.

Each part operates from a single 2.7 V to 5.5 V power supply and

features a 1 µs conversion time. The track-and-hold amplifier

allows each part to handle input frequencies of up to 14 MHz,

and a multiplexer allows taking samples from four channels.

Each AD7991/AD7995/AD7999 provides a 2-wire serial

interface compatible with I

C interfaces. The AD7991 and

AD7995 come in two versions and each version has an

individual I

C address. This allows two of the same devices to be

connected to the same I

C bus. Both versions support standard,

fast, and high speed I

C interface modes. The AD7999 comes in

one version.

The AD7991/AD7995/AD7999 normally remain in a shutdown

state, powering up only for conversions. The conversion process

is controlled by a command mode, during which each I

C read

operation initiates a conversion and returns the result over the

C bus.

When four channels are used as analog inputs, the reference for

the part is taken from V

; this allows the widest dynamic input

range to the ADC. Therefore, the analog input range to the

ADC is 0 V to V

. An external reference, applied through the

IN3

REF

input, can also be used with this part.

PRODUCT HIGHLIGHTS

Four single-ended analog input channels, or three single-

ended analog input channels and one reference input channel.

C-compatible serial interface. Standard, fast, and high

speed modes.

Automatic shutdown.

Reference derived from the power supply or external

reference.

8-lead SOT-23 package.

Resolution

Input Channels

Table 1. Related Devices

Device

AD7998

AD7997

AD7994

AD7993

AD7992

Rev. C

Document Feedback

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support

www.analog.com

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.

06461-001

AD7991/AD7995/AD7999

AD7991/AD7995/AD7999

TABLE OF CONTENTS

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

Applications ....................................................................................... 1

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

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

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

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

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

AD7991 .......................................................................................... 3

AD7995 .......................................................................................... 5

AD7999 .......................................................................................... 7

C Timing Specifications ............................................................ 9

Absolute Maximum Ratings .......................................................... 11

ESD Caution ................................................................................ 11

Pin Configuration and Function Descriptions ........................... 12

Typical Performance Characteristics ........................................... 13

Terminology .................................................................................... 16

Theory of Operation ...................................................................... 17

Data Sheet

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

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

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

Internal Register Structure ............................................................ 20

Configuration Register .............................................................. 20

Sample Delay and Bit Trial Delay ............................................. 21

Conversion Result Register ....................................................... 21

Serial Interface ................................................................................ 22

Serial Bus Address ...................................................................... 22

Writing to the AD7991/AD7995/AD7999 .................................. 23

Reading from the AD7991/AD7995/AD7999 ............................ 24

Placing the AD7991/AD7995/AD7999 into High

Speed Mode ................................................................................. 25

Mode of Operation ......................................................................... 26

Outline Dimensions ....................................................................... 27

Ordering Guide .......................................................................... 27

REVISION HISTORY

7/2018—Rev. B to Rev. C

Changes to Features Section............................................................ 1

Changes to Table 4 ............................................................................ 7

Changes to Ordering Guide .......................................................... 27

Added Automotive Products Section........................................... 27

10/2010—Rev. A to Rev. B

Changes to Max Offset Error Parameter in Table 2 ..................... 3

Changes to Max Offset Error Parameter (Y Version) in Table 3 ...... 5

Changes to Max Offset Error Parameter (Y Version) in Table 4 ...... 7

Changes to Ordering Guide..................................................................... 27

10/2009—Rev. 0 to Rev. A

Changes to Table 3 ............................................................................ 5

Changes to Table 4 ............................................................................ 7

Updated Ordering Guide ............................................................... 27

12/2007—Revision 0: Initial Version

Rev. C | Page 2 of 27

Recommended Resources

Internal functional block diagram of SC1486 power management chip

BA5173, HT7706 dimming control application specific integrated circuit

Alarm circuit using SD3 smoke detector

PWM step-down DC converter circuit MAX887

Adjustable output integrated regulated power supply circuit 2

Clockwork timer ordinary double barrel washing machine circuit

Why can't SetBkImage be used in EVC??? Waiting online!: 提示错误信息为: --------------------Configuration: list - Win32 (WCE emulator) Debug-------------------- Linking... listDlg.obj : error LNK2019: unresolved external symbol "public: int __thiscall CListCtrl::...; 625wangpeng Embedded System

Application of wireless PLC based on lora and wifi wireless communication in remote IO control of the Internet of Things: Shenzhen Zongke Zhikong Technology Development Co., Ltd. is a high-tech enterprise focusing on the production and research and development of industrial intelligent automation equipment and software s...; zongkezhikong Industrial Control Electronics

How to determine whether T4 is in the amplification state in the TTL inverter?: Note that the reference diagram is without the RL output resistor in the uploaded diagram. It is easy to understand that T5 is cut off when the input is low level, but why is T4 in the amplification s...; supernhj Analog electronics

Use Velcro to store multimeter pens: [i=s]This post was last edited by dcexpert on 2022-11-6 12:48[/i]It has always been a small problem to store the multimeter pen. When in use, the wire is expected to be longer for convenience. When no...; dcexpert DIY/Open Source Hardware

Where can I buy silicon clock chips in China?: I want to buy SI570, SI5395E, SI5383, SI53156, and some fixed frequency crystal oscillators. I looked at Yunhan and Litron, but they seem to be out of stock....; haha丶 Discrete Device

MCS51 source program compilation tool (DOS version): go on~...; maker 51mcu

Shortcut: 00 01 02 03 04 05 06 07 08 09 0A 0C 0F 0J 0L 0M 0R 0S 0T 0Z 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1H 1K 1M 1N 1P 1S 1T 1V 1X 1Z 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 2G 2K 2M 2N 2P 2Q 2R 2S 2T 2W 2Z 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 3G 3H 3J 3K 3L 3M 3N 3P 3R 3S 3T 3V 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4M 4N 4P 4S 4T 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5E 5G 5H 5K 5M 5N 5P 5S 5T 5V 60 61 62 63 64 65 66 67 68 69 6A 6C 6E 6F 6M 6N 6P 6R 6S 6T 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7M 7N 7P 7Q 7V 7W 7X 80 81 82 83 84 85 86 87 88 89 8A 8D 8E 8L 8N 8P 8S 8T 8W 8Y 8Z 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9F 9G 9H 9L 9S 9T 9W

Popular Components