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AD7689是一款由Analog Devices公司生产的16位模数转换器（ADC），专为高速、高精度数据采集而设计。这款产品拥有多种特点，适合于多通道系统监控、电池供电设备、医疗仪器、移动通讯、电力线监控、数据采集、地震数据采集系统、仪器仪表和过程控制等多种应用场合。 AD7689具备16位的分辨率，无缺失码，支持多达8个通道的多路复用器。它提供单端、差分以及伪双极输入方式，能够处理从0伏至VREF的模拟输入电压，其中VREF可以是内部可选的2.5伏或4.096伏，也可以是外部缓冲或直接输入至VDD的电压值。AD7689具有93.8dB的动态范围，92.5dB的信纳比（SINAD）以及-100dB的总谐波失真（THD）。这些参数在20kHz的测试频率下分别为92.5dB和-100dB。 AD7689的采样率为250kSPS，通过内部无流水线延迟的SAR（Successive Approximation Register）架构实现。在单电源2.3V至5.5V的操作电压范围内，与SPI、MICROWIRE、QSPI、逻辑接口和DSP兼容的串行接口可用于数据通信。在2.5V/200kSPS下，该ADC的功耗为3.5毫瓦，在5V/250kSPS下，为12.5毫瓦。待机模式下，电流消耗为50纳安。此外，AD7689还包含内部温度传感器（TEMP），能提供精确的温度监测。它可通过片上多路复用器选择输入通道，并具有可选择的单极低通滤波器，方便过滤高频信号。通过其序列器可以实现通道的连续采样。 AD7689提供20脚的4mm×4mm LFCSP封装和2.4mm×2.4mm WLCSP封装两种封装形式，均属于低成本等级。它的多功能性、低功耗以及小型封装设计，使其成为便携式和电池供电设备的理想选择。功能模块图展示了AD7689的主要模块和信号流，其中包括模拟输入、参考电压输入、模拟电源、数字输入/输出、多路复用器（MUX）、16位SAR ADC、串行接口、低通滤波器（LPF）、序列器以及地（GND）。一般描述部分详细阐述了AD7682/AD7689的基本操作原理。AD7682/AD7689是4通道/8通道的16位电荷重分布SAR模数转换器，只需要单一的电源VDD即可工作。它们包含构成多通道、低功耗数据采集系统所需的所有组件，包括真正的16位SAR ADC（无缺失码）、4通道（AD7682）或8通道（AD7689）的低交叉串扰多路复用器、可选的内部漂移参考（2.5伏或4.096伏）和缓冲器、温度传感器、可选的一阶滤波器和序列器。 AD7689具有多种操作模式，可通过软件控制完成所需任务。其软件可配置性包括选择不同的输入通道、参考源和采样率等。AD7689还具备片上数字滤波器，能够进一步提升系统性能。 AD7689的高性能参数、灵活的接口和广泛的电压兼容性，使其成为高性能信号处理应用的首选ADC。设计者可以利用AD7689在众多行业和应用中实现精确、高效率的数据采集。

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16-Bit, 4-Channel/8-Channel,

250 kSPS PulSAR ADCs

Data Sheet

AD7682/AD7689

Rev. H Document Feedback

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.

Technical Support www.analog.com

FEATURES

16-bit resolution with no missing codes

4-channel (AD7682)/8-channel (AD7689) multiplexer with

choice of inputs

Unipolar single-ended

Differential (GND sense)

Pseudobipolar

Throughput: 250 kSPS

INL: ±0.4 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)

Dynamic range: 93.8 dB

SINAD: 92.5 dB at 20 kHz

THD: −100 dB at 20 kHz

Analog input range: 0 V to V

REF

with V

REF

up to VDD

Multiple reference types

Internal selectable 2.5 V or 4.096 V

External buffered (up to 4.096 V)

External (up to VDD)

Internal temperature sensor (TEMP)

Channel sequencer, selectable 1-pole filter, busy indicator

No pipeline delay, SAR architecture

Single-supply 2.3 V to 5.5 V operation with 1.8 V to 5.5 V

logic interface

Serial interface compatible with SPI, MICROWIRE, QSPI,

and DSP

Power dissipation

3.5 mW at 2.5 V/200 kSPS

12.5 mW at 5 V/250 kSPS

Standby current: 50 nA

Low cost grade available

20-lead 4 mm × 4 mm LFCSP package

20-lead 2.4 mm × 2.4 mm WLCSP package

APPLICATIONS

Multichannel system monitoring

Battery-powered equipment

Medical instruments: ECG/EKG

Mobile communications: GPS

Power line monitoring

Data acquisition

Seismic data acquisition systems

Instrumentation

Process control

FUNCTIONAL BLOCK DIAGRAM

AD7682/

7689

REF

GND

VDD

VIO

DIN

SCK

SDO

CNV

1.8V

VDD

2.3V TO 5.5V

SEQUENCER

SPI SERIAL

INTERFACE

MUX

16-BIT SAR

ADC

BAND GAP

REF

TEMP

SENSOR

REFIN

IN0

IN1

IN4

IN5

IN6

IN7

IN3

IN2

COM

0.5V TO VDD

10µF

ONE-POLE

LPF

0.5V TO VDD – 0.5V

0.1µF

07353-001

Figure 1.

GENERAL DESCRIPTION

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge

redistribution successive approximation register (SAR) analog-

to-digital converters (ADCs) that operate from a single power

supply, VDD.

The AD7682/AD7689 contain all components for use in a

multichannel, low power data acquisition system, including a

true 16-bit SAR ADC with no missing codes; a 4-channel

(AD7682) or 8-channel (AD7689) low crosstalk multiplexer

that is useful for configuring the inputs as single-ended (with or

without ground sense), differential, or bipolar; an internal low

drift reference (selectable 2.5 V or 4.096 V) and buffer; a

temperature sensor; a selectable one-pole filter; and a sequencer

that is useful when channels are continuously scanned in order.

The AD7682/AD7689 use a simple SPI interface for writing to

the configuration register and receiving conversion results. The

SPI interface uses a separate supply, VIO, which is set to the

host logic level. Power dissipation scales with throughput.

The AD7682/AD7689 are housed in a tiny 20-lead LFCSP and

20-lead WLCSP with operation specified from −40°C to +85°C.

Table 1. Multichannel 14-/16-Bit PulSAR® ADCs

Type Channels 250 kSPS 500 kSPS ADC Driver

14-Bit

AD7949

ADA4805-1/

ADA4807-1

16-Bit 4

AD7682

ADA4805-1/

ADA4807-1

16-Bit 8

AD7689 AD7699

ADA4805-1/

ADA4807-1

AD7682/AD7689 Data Sheet

Rev. H | Page 2 of 35

TABLE OF CONTENTS

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

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

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

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

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

Specifications ..................................................................................... 4

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

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

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

Pin Configurations and Function Descriptions ......................... 10

Typical Performance Characteristics ........................................... 14

Terminology .................................................................................... 17

Theory of Operation ...................................................................... 18

Overview ...................................................................................... 18

Converter Operation .................................................................. 18

Transfer Functions...................................................................... 19

Typical Connection Diagrams .................................................. 20

Analog Inputs .............................................................................. 21

Driver Amplifier Choice ............................................................ 23

Voltage Reference Output/Input .............................................. 23

Power Supply ............................................................................... 25

Supplying the ADC from the Reference .................................. 25

Digital Interface .............................................................................. 26

Reading/Writing During Conversion, Fast Hosts .................. 26

Reading/Writing After Conversion, Any Speed Hosts .......... 26

Reading/Writing Spanning Conversion, Any Speed Host .... 26

Configuration Register, CFG .................................................... 26

General Timing Without a Busy Indicator ............................. 28

General Timing with a Busy Indicator .................................... 29

Channel Sequencer .................................................................... 30

Read/Write Spanning Conversion Without a Busy

Indicator ...................................................................................... 31

Read/Write Spanning Conversion with a Busy Indicator ..... 32

Applications Information .............................................................. 33

Layout .......................................................................................... 33

Evaluating the AD7682/AD7689 Performance ........................ 33

Outline Dimensions ....................................................................... 34

Ordering Guide .......................................................................... 35

REVISION HISTORY

8/2017—Rev. G to Rev. H

Changed CP-20-8 to CP-20-10 .................................... Throughout

Change to Product Title ................................................................... 1

Updated Outline Dimensions ....................................................... 34

Changes to Ordering Guide .......................................................... 35

6/2017—Rev. F to Rev. G

Changed CP-20-10 to CP-20-8 .................................... Throughout

Changes to Table 11 ........................................................................ 27

Updated Outline Dimensions ....................................................... 34

Changes to Ordering Guide .......................................................... 35

4/2016—Rev. E to Rev. F

Changed ADA4841-x to ADA4805-1/ADA4807-1, Table 1 ....... 1

Added Endnote 6, Table 3; Renumbered Sequentially ................ 6

Changes to Figure 28 and Figure 29 ............................................. 20

Changes to Table 10 ........................................................................ 23

Changes to External Reference Section and the Reference

Decoupling Section ........................................................................ 24

Changes to the Supplying the ADC from the Reference Section .. 25

Changes to Ordering Guide .......................................................... 35

1/2015—Rev. D to Rev. E

Added WLCSP (Throughout) ......................................................... 1

Added WLCSP Signal-to-Noise and SINAD Parameters;

Table 2 ................................................................................................. 3

Changed θ

Thermal Impedance (LFCSP) from 47.6°C/W to

48°C/W ............................................................................................... 9

Added Figure 6, Figure 7, and Table 8 ......................................... 12

Changes to Layout Section ............................................................ 33

Added Figure 47; Outline Dimensions ........................................ 34

Changes to Ordering Guide .......................................................... 35

4/2012—Rev. C to Rev. D

Changes to Figure 27 ...................................................................... 18

Changed Internal Reference Section to Internal

Reference/Temperature Sensor Section ....................................... 21

Changes to Internal Reference/Temperature Sensor Section ... 21

Changed External Reference/Temperature Sensor Section to

External Reference Section ........................................................... 22

Changes to External Reference and Internal Buffer Section and

External Reference Section ........................................................... 22

Changes to REF Bit, Function Column, Table 10 ...................... 25

Updated Outline Dimensions ....................................................... 32

Data Sheet AD7682/AD7689

Rev. H | Page 3 of 35

9/2011—Rev. B to Rev. C

Changes to Internal Reference Section ........................................ 21

Changes to the External Reference and Internal Buffer

Section .............................................................................................. 22

Changes to the External Reference/Temperature Sensor

Section .............................................................................................. 22

Changes to Table 10, REF Bit Description ................................... 25

6/2009—Rev. A to Rev. B

Changes Table 6 ................................................................................. 8

Changes to Figure 37 ...................................................................... 25

Changes to Figure 38 ...................................................................... 26

3/2009—Rev. 0 to Rev. A

Changes to Features Section, Applications Section, and

Figure 1 ............................................................................................... 1

Added Table 2; Renumbered Sequentially ..................................... 3

Changed VREF to V

REF

..................................................................... 4

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

Changes to Table 4 ............................................................................ 6

Changes to Table 5 ............................................................................ 7

Deleted Endnote 2 in Table 6 ........................................................... 8

Changes to Figure 4, Figure 5, and Table 7 .................................... 9

Changes to Figure 6, Figure 9, and Figure 10 .............................. 11

Changes to Figure 22 ...................................................................... 13

Changes to Overview Section and Converter Operation

Section .............................................................................................. 15

Changes to Table 8 .......................................................................... 16

Changes to Figure 26 and Figure 27 ............................................. 17

Changes to Bipolar Single Supply Section and Analog Inputs

Section .............................................................................................. 18

Changes to Internal Reference/Temperature Sensor Section .... 20

Added Figure 31; Renumbered Sequentially ............................... 20

Changes to External Reference and Internal Buffer Section and

External Reference Section ............................................................ 21

Added Figure 32 and Figure 33 ..................................................... 21

Changes to Power Supply Section ................................................. 22

Changes to Digital Interface Section, Reading/Writing After

Conversion, Any Speed Hosts Section, and Configuration

Changes to Table 10 ........................................................................ 24

Added General Timing Without a Busy Indicator Section and

Figure 37 ........................................................................................... 25

Added General Timing With a Busy Indicator Section and

Figure 38 ........................................................................................... 26

Added Channel Sequencer Section and Figure 39 ..................... 27

Changes to Read/Write Spanning Conversion Without a Busy

Indicator Section and Figure 41 .................................................... 28

Changes to Read/Write Spanning Conversion with a Busy

Indicator and Figure 43 .................................................................. 29

Changes to Evaluating AD7682/AD7689 Performance

Section .............................................................................................. 30

Added Exposed Pad Notation to Outline Dimensions .............. 31

Changes to Ordering Guide ........................................................... 31

5/2008—Revision 0: Initial Version

AD7682/AD7689 Data Sheet

Rev. H | Page 4 of 35

SPECIFICATIONS

VDD = 2.3 V to 5.5 V, VIO = 1.8 V to VDD, V

REF

= VDD, all specifications T

MIN

to T

MAX

, unless otherwise noted.

Table 2.

Parameter

Test Conditions/

Comments

AD7689A AD7682B/AD7689B

Unit Min Typ Max Min Typ Max

RESOLUTION 16 16 Bits

ANALOG INPUT

Voltage Range Unipolar mode 0 +V

REF

0 +V

REF

Bipolar mode −V

REF

/2 +V

REF

/2 −V

REF

/2 +V

REF

Absolute Input Voltage Positive input, unipolar

and bipolar modes

−0.1 V

REF

+ 0.1 −0.1 V

REF

+ 0.1 V

Negative or COM input,

unipolar mode

−0.1 +0.1 −0.1 +0.1 V

Negative or COM input,

bipolar mode

REF

/2 − 0.1 V

REF

/2 V

REF

/2 + 0.1 V

REF

/2 − 0.1 V

REF

/2 V

REF

/2 + 0.1 V

Analog Input CMRR

= 250 kHz

Leakage Current at 25°C Acquisition phase 1 1 nA

Input Impedance

THROUGHPUT

Conversion Rate

Full Bandwidth

VDD = 4.5 V to 5.5 V 0 250 0 250 kSPS

VDD = 2.3 V to 4.5 V 0 200 0 200 kSPS

¼ Bandwidth

VDD = 4.5 V to 5.5 V 0 62.5 0 62.5 kSPS

VDD = 2.3 V to 4.5 V 0 50 0 50 kSPS

Transient Response Full-scale step, full

bandwidth

1.8 1.8 μs

Full-scale step,

¼ bandwidth

14.5 14.5 μs

ACCURACY

No Missing Codes 15 16 Bits

Integral Linearity Error −4 +4 −1.5 ±0.4 +1.5 LSB

Differential Linearity Error −1 ±0.25 +1.5 LSB

Transition Noise

REF = VDD = 5 V

0.6

0.5

LSB

Gain Error

−32 +32 −8 ±1 +8 LSB

Gain Error Match ±2 −4 ±0.5 +4 LSB

Gain Error Temperature

Drift

±1 ±1 ppm/°C

Offset Error

VDD = 4.5 V to 5.5 V −32 +32 −8 ±1 +8 LSB

VDD = 2.3 V to 4.5 V ±32 ±5 LSB

Offset Error Match ±2 −4 ±0.5 +4 LSB

Offset Error Temperature

Drift

±1 ±1 ppm/°C

Power Supply Sensitivity

VDD = 5 V ± 5%

±1.5

LSB

AC ACCURACY

Dynamic Range 90.5 93.8 dB

Signal-to-Noise

LFCSP f

= 20 kHz, V

REF

= 5 V 90 92.5 93.5 dB

= 20 kHz, V

REF

= 4.096 V,

internal REF

89 91 92.3 dB

= 20 kHz, V

REF

= 2.5 V,

internal REF

86 87.5 88.8 dB

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