Data Sheet
FEATURES
High resolution ADC
24 bits, no missing codes
±0.0015% nonlinearity
Optimized for fast channel switching
18-bit p-p resolution (21 bits effective) at 500 Hz
16-bit p-p resolution (19 bits effective) at 4 kHz
On-chip per channel system calibration
Configurable inputs
8 single-ended or 4 fully differential
Input ranges
+625 mV, ±625 mV, +1.25 V, ±1.25 V, +2.5 V, ±2.5 V
3-wire serial interface
SPI®, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on logic inputs
Single-supply operation
5 V analog supply
3 V or 5 V digital supply
Package: 24-lead TSSOP
8-Channel, High Throughput,
24-Bit Sigma-Delta ADC
AD7739
FUNCTIONAL BLOCK DIAGRAM
REFIN(–)
REFIN(+)
REFERENCE
DETECT
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
CALIBRATION
CIRCUITRY
AV
DD
CLOCK
GENERATOR
CONTROL
LOGIC
RESET
RDY
SERIAL
INTERFACE
MUX
BUFFER
24-BIT
-
ADC
AD7739
DV
DD
CS
SCLK
DOUT
DIN
AINCOM/P0
SYNC/P1
I/O PORT
APPLICATIONS
PLCs/DCSs
Multiplexing applications
Process control
Industrial instrumentation
AGND
AV
DD
MCLKOUT MCLKIN DGND
DV
DD
03742-0-012
Figure 1.
GENERAL DESCRIPTION
The
AD7739
is a high precision, high throughput analog front
end. True 16-bit p-p resolution is achievable with a total
conversion time of 250 μs (4 kHz channel switching), making it
ideally suited to high resolution multiplexing applications.
The part can be configured via a simple digital interface, which
allows users to balance the noise performance against data
throughput up to 15 kHz.
The analog front end features eight single-ended or four fully
differential input channels with unipolar or bipolar 625 mV,
1.25 V, and 2.5 V input ranges. It accepts a common-mode
input voltage from 200 mV above AGND to AV
DD
− 300 mV.
The differential reference input features no-reference detect
capability. The ADC also supports per channel system
calibration options.
The digital serial interface can be configured for 3-wire
operation and is compatible with microcontrollers and digital
signal processors. All interface inputs are Schmitt triggered.
Rev. A
Document Feedback
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2003–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
The part is specified for operation over the extended industrial
temperature range of –40°C to +105°C.
Other parts in the
AD7739
family are the
AD7738, AD7734,
and
AD7732.
The
AD7738
is similar to the
AD7739
but has higher speed
(8.5 kHz channel switching for 16-bit performance) and higher
AIN leakage current. The
AD7738
multiplexer output is pinned
out externally, allowing the user to implement programmable
gain or signal conditioning before being applied to the ADC.
The
AD7734
analog front end features four single-ended input
channels with unipolar or true bipolar input ranges to ±10 V
while operating from a single +5 V analog supply. The
AD7734
accepts an analog input overvoltage to ±16.5 V without
degrading the performance of the adjacent channels.
The
AD7732
is similar to the
AD7734,
but its analog front end
features two fully differential input channels.
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.
AD7739* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
REFERENCE MATERIALS
Technical Articles
•
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
•
MS-2210: Designing Power Supplies for High Speed ADC
EVALUATION KITS
•
AD7739 Evaluation Kit
DESIGN RESOURCES
DOCUMENTATION
Application Notes
•
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-
Delta ADC
•
AN-663: AD7732/AD7734/AD7738/AD7739 Calibration
Registers
•
AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power
Applications
Data Sheet
•
AD7739: 8-Channel,High Throughput, 24-Bit Sigma-Delta
ADC Data Sheet
•
AD7739 Material Declaration
•
PCN-PDN Information
•
Quality And Reliability
•
Symbols and Footprints
DISCUSSIONS
View all AD7739 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
SOFTWARE AND SYSTEMS REQUIREMENTS
•
AD7732/4/8/9 Evaluation Software
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
TOOLS AND SIMULATIONS
•
Sigma-Delta ADC Tutorial
DOCUMENT FEEDBACK
Submit feedback for this data sheet.
This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not
trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.
AD7739
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Timing Diagrams.......................................................................... 6
Absolute Maximum Ratings ............................................................ 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Descriptions ............................. 8
Typical Performance Characteristics ........................................... 10
Output Noise and Resolution Specification ................................ 11
Chopping Enabled ...................................................................... 11
Chopping Disabled ..................................................................... 12
Register Descriptions ..................................................................... 13
Register Access ............................................................................ 14
Communications Register ......................................................... 14
I/O Port Register......................................................................... 15
Revision Register ........................................................................ 15
Test Register ................................................................................ 15
ADC Status Register ................................................................... 15
Checksum Register ..................................................................... 16
ADC Zero-Scale Calibration Register ..................................... 16
ADC Full-Scale Calibration Register ....................................... 16
Channel Data Registers.............................................................. 16
Channel Zero-Scale Calibration Registers .............................. 16
Data Sheet
Channel Full-Scale Calibration Registers ............................... 16
Channel Status Registers ........................................................... 17
Channel Setup Registers ............................................................ 18
Channel Conversion Time Registers ....................................... 19
Mode Register ............................................................................. 19
Digital Interface Description ........................................................ 21
Hardware ..................................................................................... 21
Reset ............................................................................................. 22
Access the AD7739 Registers.................................................... 22
Single Conversion and Reading Data ...................................... 22
Dump Mode ................................................................................ 22
Continuous Conversion Mode ................................................. 23
Continuous Read (Continuous Conversion) Mode .............. 24
Circuit Description......................................................................... 25
Analog Inputs.............................................................................. 25
Sigma-Delta ADC ...................................................................... 25
Chopping ..................................................................................... 25
Multiplexer, Conversion, and Data Output Timing .............. 26
Frequency Response .................................................................. 27
Extended Voltage Range of the Analog Input ........................ 27
Voltage Reference Inputs ........................................................... 28
Reference Detect ......................................................................... 28
I/O Port ........................................................................................ 28
Calibration................................................................................... 28
Outline Dimensions ....................................................................... 30
Ordering Guide .......................................................................... 30
REVISION HISTORY
8/13—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Figure 1 .......................................................................... 1
Change to ADC Performance Chopping Enabled, Integral
Nonlinearity Parameter, Table 1 ..................................................... 3
Change to Table 3 ............................................................................. 7
Deleted Figure 12, Renumbered Sequentially .............................. 8
Changes to Revision Register Section .......................................... 15
Change to Voltage Reference Inputs Section .............................. 28
Updated Outline Dimensions ....................................................... 30
Changes to Ordering Guide .......................................................... 30
5/03—Revision 0: Initial Version
Rev. A | Page 2 of 32
Data Sheet
SPECIFICATIONS
AD7739
–40°C to +105°C; AV
DD
= 5 V ± 5%; DV
DD
= 2.7 V to 3.6 V, or 5 V ± 5%; REFIN(+) = 2.5 V; REFIN(–) = 0 V, AINCOM = 2.5 V; Internal
Buffer On, AIN Range = ±1.25 V; f
MCLKIN
= 6.144 MHz; unless otherwise noted.
Table 1.
Parameter
ADC PERFORMANCE, CHOPPING
ENABLED
Conversion Time Rate
No Missing Codes
1, 2
Output Noise
Resolution
Integral Nonlinearity (INL)
2
Offset Error (Unipolar, Bipolar)
3
Offset Drift vs. Temperature
1
Gain Error
3
Gain Drift vs. Temperature
1
Positive Full-Scale Error
3
Positive Full-Scale Drift vs. Temp.
1
Bipolar Negative Full-Scale Error
4
Common-Mode Rejection
Power Supply Rejection
ADC PERFORMANCE, CHOPPING
DISABLED
Conversion Time Rate
No Missing Codes
1, 2
Output Noise
Resolution
Integral Nonlinearity (INL)
2
Offset Error (Unipolar, Bipolar)
5
Offset Drift vs. Temperature
Gain Error
3
Gain Drift vs. Temperature
Positive Full-Scale Error
3
Positive Full-Scale Drift vs. Temp.
Bipolar Negative Full-Scale Error
4
Common-Mode Rejection
Power Supply Rejection
ANALOG INPUTS
Analog Input Voltage
1, 6
±2.5 V Range
2.5 V Range
±1.25 V Range
1.25 V Range
±0.625 V Range
0.625 V Range
AIN, AINCOM Common-Mode/
Absolute Voltage
1
Analog Input Slew Rate
1, 7
AIN, AINCOM Input Current
1, 8
Min
Typ
Max
Unit
Test Conditions/Comments
372
24
See Table 5
See Table 6
and Table 7
±0.0005
±10
11840
Hz
Bits
Configure via conv. time register
FW ≥ 12 (conversion time ≥ 290 μs)
±0.0015
±25
±0.2
±2.5
±0.2
±2.5
80
70
±0.0030
95
80
% of FSR
μV
nV/°C
%
ppm of FS/°C
% of FSR
ppm of FS/°C
% of FSR
dB
dB
Before calibration
Before calibration
Before calibration
After calibration
At dc, AIN = 1 V
At dc, AIN = 1 V
737
24
See Table 8
See Table 9
and Table 10
±0.0015
±1
±1.5
±0.2
±2.5
±0.2
±2.5
±0.0030
75
65
15133
Hz
Bits
Configure via conv. time register
FW
12 (conversion time
290 μs)
% of FSR
mV
μV/°C
%
ppm of FS/°C
% of FSR
ppm of FS/°C
% of FSR
dB
dB
Before calibration
Before calibration
Before calibration
After calibration
At dc, AIN = 1 V
At dc, AIN = 1 V
±2.5
0 to 2.5
±1.25
0 to 1.25
±0.625
0 to 0.625
0.2
AV
DD
− 0.3
0.5
5
V
V
V
V
V
V
V
V/conv. time
nA
AIN absolute voltage > 3 V
Only one channel, chop disabled
1
Rev. A | Page 3 of 32
AD7739
Parameter
REFERENCE INPUTS
REFIN(+) to REFIN(−) Voltage
1, 9
NOREF Trigger Voltage
REFIN(+), REFIN(−) Common-Mode/
Absolute Voltage
1
Reference Input DC Current
10
SYSTEM CALIBRATION
1, 11
Full-Scale Calibration Limit
Zero-Scale Calibration Limit
Input Span
LOGIC INPUTS
Input Current
Input Current CS
Input Capacitance
V
T+1
V
T–1
V
T+
– V
T–1
V
T+1
V
T–1
V
T+
– V
T–1
MCLK IN ONLY
Input Current
Input Capacitance
V
INL
Input Low Voltage
V
INH
Input High Voltage
V
INL
Input Low Voltage
V
INH
Input High Voltage
LOGIC OUTPUTS
12
V
OL
Output Low Voltage
V
OH
Output High Voltage
V
OL
Output Low Voltage
V
OH
Output High Voltage
Floating State Leakage Current
Floating State Leakage Capacitance
P0, P1 INPUTS/OUTPUTS
Input Current
V
INL
Input Low Voltage
V
INH
Input High Voltage
V
OL
Output Low Voltage
V
OH
Output High Voltage
Min
2.475
0
Typ
2.5
0.5
Max
2.525
AV
DD
400
+1.05 × FS
−1.05 × FS
0.8 × FS
2.1 × FS
±1
±10
−40
5
1.4
0.8
0.3
0.95
0.4
0.3
2
1.4
0.85
2
1.1
0.85
±10
5
0.8
3.5
0.4
2.5
0.4
4.0
0.4
DV
DD
− 0.6
±1
3
±10
0.8
3.5
0.4
4.0
Unit
V
V
V
μA
V
V
V
μA
μA
μA
pF
V
V
V
V
V
V
μA
pF
V
V
V
V
V
V
V
V
μA
pF
μA
V
V
V
V
Data Sheet
Test Conditions/Comments
NOREF bit in channel status register
CS = DV
DD
CS = DGND, internal pull-up resistor
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 3 V
DV
DD
= 3 V
DV
DD
= 3 V
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 3 V
DV
DD
= 3 V
I
SINK
= 800 μA, DV
DD
= 5 V
I
SOURCE
= 200 μA, DV
DD
= 5 V
I
SINK
= 100 μA, DV
DD
= 3 V
I
SOURCE
= 100 μA, DV
DD
= 3 V
Levels referenced to analog supplies
AV
DD
= 5 V
AV
DD
= 5 V
I
SINK
= 8 mA, AV
DD
= 5 V
I
SOURCE
= 200 μA, AV
DD
= 5 V
Rev. A | Page 4 of 32
京公网安备 11010802033920号
EEWORLD
