AD7708BRUZ-REEL7 datasheet, PDF

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AD7708BRUZ-REEL7: Description10-Channel Single ADC Delta-Sigma 1.365ksps 16-bit Serial 28-Pin TSSOP T/R; File Size330KB，44 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD7708BRUZ-REEL7 Overview

10-Channel Single ADC Delta-Sigma 1.365ksps 16-bit Serial 28-Pin TSSOP T/R

AD7708BRUZ-REEL7 Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Converter Type	General Purpose
Architecture	Delta-Sigma
Resolution	16bit
Number of ADCs	1
Number of Input Channels	5/4\|10/8
Sampling Rate	1.365ksps
Digital Interface Type	Serial (3-Wire, SPI, QSPI, Microwire)
Input Type	Voltage
Input Signal Type	Differential\|Pseudo-Differential
Voltage Reference	External
Polarity of Input Voltage	Bipolar
Voltage Supply Source	Analog and Digital
Input Voltage	±2.56V
Minimum Single Supply Voltage (V)	2.7
Typical Single Supply Voltage (V)	5\|3
Maximum Single Supply Voltage (V)	5.25
Typical Power Dissipation (mW)	3.84
Integral Nonlinearity Error	±15ppm of FSR
Full Scale Error	±0.75LSB(Typ)
Signal to Noise Ratio	112dB
No Missing Codes (bit)	16
Sample and Hold	No
Single-Ended Input	No
Digital Supply Support	Yes
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Packaging	Tape and Reel
Pin Count	28
Standard Package Name	SOP
Supplier Package	TSSOP
Mounting	Surface Mount
Package Height	1.05(Max)
Package Length	9.7
Package Width	4.4
PCB changed	28
Lead Shape	Gull-wing

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FEATURES

8-/10-Channel, High Resolution - ADCs

AD7708 Has 16-Bit Resolution

AD7718 Has 24-Bit Resolution

Factory-Calibrated

Single Conversion Cycle Setting

Programmable Gain Front End

Simultaneous 50 Hz and 60 Hz Rejection

VREF Select™

Allows Absolute and Ratiometric

Measurement Capability

Operation Can Be Optimized for

Analog Performance (CHOP = 0) or

Channel Throughput (CHOP = 1)

INTERFACE

3-Wire Serial

SPI

, QSPI

, MICROWIRE

, and DSP-Compatible

Schmitt Trigger on SCLK

POWER

Specified for Single 3 V and 5 V Operation

Normal: 1.28 mA Typ @ 3 V

Power-Down: 30 A (32 kHz Crystal Running)

On-Chip Functions

Rail-to-Rail Input Buffer and PGA

2-Bit Digital I/O Port

APPLICATIONS

Industrial Process Control

Instrumentation

Pressure Transducers

Portable Instrumentation

Smart Transmitters

8-/10-Channel, Low Voltage,

Low Power, - ADCs

AD7708/AD7718

GENERAL DESCRIPTION

The AD7708/AD7718 are complete analog front-ends for low

frequency measurement applications. The AD7718 contains a

24-bit

Σ-∆

ADC with PGA and can be configured as 4/5 fully-

differential input channels or 8/10 pseudo-differential input

channels. Two pins on the device are configurable as analog

inputs or reference inputs. The AD7708 is a 16-bit version of

the AD7718. Input signal ranges from 20 mV to 2.56 V can be

directly converted using these ADCs. Signals can be converted

directly from a transducer without the need for signal conditioning.

The device operates from a 32 kHz crystal with an on-board PLL

generating the required internal operating frequency. The output

data rate from the part is software programmable. The peak-to-

peak resolution from the part varies with the programmed gain

and output data rate.

The part operates from a single 3 V or 5 V supply. When operating

from 3 V supplies, the power dissipation for the part is 3.84 mW typ.

Both parts are pin-for-pin compatible allowing an upgradable

path from 16 to 24 bits without the need for hardware modifica-

tions. The AD7708/AD7718 are housed in 28-lead SOIC and

TSSOP packages.

FUNCTIONAL BLOCK DIAGRAM

DVDD

DGND

REFIN2(+)/AIN9

REFIN1(+) REFIN2(–)/AIN10

REFIN1(–) XTAL1 XTAL2

OSC

AND

PLL

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

AIN8

AINCOM

POS BUF

REFIN(+)

MUX

NEG BUF

PGA

REFIN(–)

- ADC*

*AD7708 16-BIT ADC

*AD7718 24-BIT ADC

AVDD

SERIAL

INTERFACE

AND

CONTROL

LOGIC

DOUT

DIN

SCLK

RDY

RESET

AD7708/AD7718

AVDD

AGND

I/O PORT

SPI and QSPI are trademarks of Motorola Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

VREF Select

is a trademark of Analog Devices, Inc.

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. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

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

AD7708/AD7718

TABLE OF CONTENTS

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

FUNCTIONAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . 1

GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 1

AD7718 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 3

AD7708 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 6

TIMING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . 9

ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . 10

ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 12

PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 13

ADC CIRCUIT INFORMATION . . . . . . . . . . . . . . . . . . . 15

Signal Chain Overview (CHOP Enabled, CHOP = 0) . . . 15

ADC NOISE PERFORMANCE CHOP ENABLED

(CHOP = 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Signal Chain Overview (CHOP Disabled CHOP = 1) . . . 19

ADC NOISE PERFORMANCE CHOP DISABLED

(CHOP = 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

ON-CHIP REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Communications Register . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Mode Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Operating Characteristics when Addressing the

Mode and Control Registers . . . . . . . . . . . . . . . . . . . . . . . 28

ADC Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Filter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

I/O Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

ADC Data Result Register . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Unipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Bipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

ADC Offset Calibration Coefficient Registers . . . . . . . . . . . 31

ADC Gain Calibration Coefficient Register . . . . . . . . . . . . . 31

ID Register (ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

User Nonprogrammable Test Registers . . . . . . . . . . . . . . . . 31

Configuring the AD7708/AD7718 . . . . . . . . . . . . . . . . . . . . 32

DIGITAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

MICROCOMPUTER/MICROPROCESSOR

INTERFACING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

AD7708/AD7718 to 68HC11 Interface . . . . . . . . . . . . . . . . 34

AD7708/AD7718-to-8051 Interface . . . . . . . . . . . . . . . . . . 35

AD7708/AD7718-to-ADSP-2103/ADSP-2105 Interface . . . 36

BASIC CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . 36

Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Single-Ended Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Chop Mode of Operation (CHOP = 0) . . . . . . . . . . . . . . . . 37

Nonchop Mode of Operation (CHOP = 1) . . . . . . . . . . . . . 38

Programmable Gain Amplifier . . . . . . . . . . . . . . . . . . . . . . . 38

Bipolar/Unipolar Configuration . . . . . . . . . . . . . . . . . . . . . . 38

Data Output Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Oscillator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

RESET

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Grounding and Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Programmable Logic Controllers . . . . . . . . . . . . . . . . . . . . . 41

Converting Single-Ended Inputs. . . . . . . . . . . . . . . . . . . . . 42

Combined Ratiometric and Absolute Value

Measurement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Optimizing Throughput while Maximizing 50 Hz

and 60 Hz Rejection in a Multiplexed Data

Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 44

–2–

REV. 0

AD7708BRUZ-REEL7 Related Products

	AD7708BRUZ-REEL7	GP5048-2641-CB25W	AD7718BRZ-REEL	AD7718BRUZ-REEL7
Description	10-Channel Single ADC Delta-Sigma 1.365ksps 16-bit Serial 28-Pin TSSOP T/R	Fixed Resistor, Metal Film, 0.125W, 2640ohm, 200V, 0.25% +/-Tol, 25ppm/Cel,	10-Channel Single ADC Delta-Sigma 1.365ksps 24-bit Serial 28-Pin SOIC W T/R	10-Channel Single ADC Delta-Sigma 1.365ksps 24-bit Serial 28-Pin TSSOP T/R
EU restricts the use of certain hazardous substances	Compliant	-	Compliant	Compliant
ECCN (US)	EAR99	-	EAR99	EAR99
Part Status	Active	-	Active	Active
HTS	8542.39.00.01	-	8542.39.00.01	8542.39.00.01
Converter Type	General Purpose	-	General Purpose	General Purpose
Architecture	Delta-Sigma	-	Delta-Sigma	Delta-Sigma
Resolution	16bit	-	24bit	24bit
Number of ADCs	1	-	1	1
Number of Input Channels	5/4\|10/8	-	5/4\|10/8	10/8\|5/4
Sampling Rate	1.365ksps	-	1.365ksps	1.365ksps
Digital Interface Type	Serial (3-Wire, SPI, QSPI, Microwire)	-	Serial (3-Wire, SPI, QSPI, Microwire)	Serial (3-Wire, SPI, QSPI, Microwire)
Input Type	Voltage	-	Voltage	Voltage
Input Signal Type	Differential\|Pseudo-Differential	-	Differential\|Pseudo-Differential	Pseudo-Differential\|Differential
Voltage Reference	External	-	External	External
Polarity of Input Voltage	Bipolar	-	Bipolar	Bipolar
Voltage Supply Source	Analog and Digital	-	Analog and Digital	Analog and Digital
Input Voltage	±2.56V	-	±2.56V	±2.56V
Minimum Single Supply Voltage (V)	2.7	-	2.7	2.7
Typical Single Supply Voltage (V)	5\|3	-	5\|3	3\|5
Maximum Single Supply Voltage (V)	5.25	-	5.25	5.25
Typical Power Dissipation (mW)	3.84	-	3.84	3.84
Integral Nonlinearity Error	±15ppm of FSR	-	±10ppm of FSR	±10ppm of FSR
Full Scale Error	±0.75LSB(Typ)	-	±0.003%FSR	±0.003%FSR
Signal to Noise Ratio	112dB	-	126dB	126dB
No Missing Codes (bit)	16	-	24	24
Sample and Hold	No	-	No	No
Single-Ended Input	No	-	No	No
Digital Supply Support	Yes	-	Yes	Yes
Minimum Operating Temperature (°C)	-40	-	-40	-40
Maximum Operating Temperature (°C)	85	-	85	85
Packaging	Tape and Reel	-	Tape and Reel	Tape and Reel
Pin Count	28	-	28	28
Standard Package Name	SOP	-	SOP	SOP
Supplier Package	TSSOP	-	SOIC W	TSSOP
Mounting	Surface Mount	-	Surface Mount	Surface Mount
Package Height	1.05(Max)	-	2.35(Max)	1.05(Max)
Package Length	9.7	-	18.1(Max)	9.7
Package Width	4.4	-	7.6(Max)	4.4
PCB changed	28	-	28	28
Lead Shape	Gull-wing	-	Gull-wing	Gull-wing

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