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Analog Devices Semiconductor Electronic Components Datasheet

AD7793 Datasheet

(AD7792 / AD7793) 16/24-Bit Sigma-Delta ADC

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3-Channel, Low Noise, Low Power, 16-/24-Bit
-Δ ADC with On-Chip In-Amp and Reference
AD7792/AD7793
FEATURES
Up to 23 bits effective resolution
RMS noise
40 nV @ 4.17 Hz
85 nV @ 16.7 Hz
Current: 400 μA typical
Power-down: 1 μA maximum
Low noise programmable gain instrumentation amp
Band gap reference with 4 ppm/°C drift typical
Update rate: 4.17 Hz to 470 Hz
3 differential inputs
Internal clock oscillator
Simultaneous 50 Hz/60 Hz rejection
Programmable current sources
On-chip bias voltage generator
Burnout currents
Power supply: 2.7 V to 5.25 V
–40°C to +105°C temperature range
Independent interface power supply
16-lead TSSOP package
Interface
3-wire serial
SPI®, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Thermocouple measurements
RTD measurements
Thermistor measurements
Gas analysis
Industrial process control
Instrumentation
Portable instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromatography
6-digit DVM
FUNCTIONAL BLOCK DIAGRAM
GND AVDD
REFIN(+)/AIN3(+) REFIN(–)/AIN3(–)
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
VBIAS
AVDD
BAND GAP
REFERENCE
MUX
BUF
IN-AMP
IOUT1
IOUT2
AVDD GND
INTERNAL
CLOCK
GND
Σ-Δ
ADC
SERIAL
INTERFACE
AND
CONTROL
LOGIC
AD7792: 16-BIT
AD7793: 24-BIT
DOUT/RDY
DIN
SCLK
CS
DVDD
CLK
Figure 1.
GENERAL DESCRIPTION
The AD7792/AD7793 are low power, low noise, complete
analog front ends for high precision measurement applications.
The AD7792/AD7793 contain a low noise 16-/24-bit ∑-Δ ADC
with three differential analog inputs. The on-chip, low noise
instrumentation amplifier means that signals of small ampli-
tude can be interfaced directly to the ADC. With a gain
setting of 64, the rms noise is 40 nV when the update rate
equals 4.17 Hz.
The devices contain a precision low noise, low drift internal
band gap reference and can accept an external differential
reference. Other on-chip features include programmable
excitation current sources, burnout currents, and a bias voltage
generator. The bias voltage generator sets the common-mode
voltage of a channel to AVDD/2.
The devices can be operated with either the internal clock or an
external clock. The output data rate from the parts is software-
programmable and can be varied from 4.17 Hz to 470 Hz.
The parts operate with a power supply from 2.7 V to 5.25 V.
They consume a current of 400 μA typical and are housed in a
16-lead TSSOP package.
Rev. B
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD7793 Datasheet

(AD7792 / AD7793) 16/24-Bit Sigma-Delta ADC

No Preview Available !

AD7792/AD7793
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Characteristics..................................................................... 6
Timing Diagrams.......................................................................... 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Output Noise and Resolution Specifications .............................. 11
External Reference...................................................................... 11
Internal Reference ...................................................................... 12
Typical Performance Characteristics ........................................... 13
On-Chip Registers .......................................................................... 14
Communications Register......................................................... 14
Status Register ............................................................................. 15
Mode Register ............................................................................. 15
Configuration Register .............................................................. 17
Data Register ............................................................................... 18
ID Register................................................................................... 18
IO Register................................................................................... 18
REVISION HISTORY
3/07—Rev. A to Rev. B
Updated Format..................................................................Universal
Change to Functional Block Diagram ........................................... 1
Changes to Specifications Section.................................................. 3
Changes to Specifications Endnote 1............................................. 5
Changes to Table 5, Table 6, and Table 7 ..................................... 11
Changes to Table 8, Table 9, and Table 10 ................................... 12
Changes to Table 16........................................................................ 16
Changes to Overview Section ....................................................... 20
Renamed Applications Section to Applications Information... 29
Changes to Ordering Guide .......................................................... 30
Offset Register ............................................................................ 19
Full-Scale Register...................................................................... 19
ADC Circuit Information.............................................................. 20
Overview ..................................................................................... 20
Digital Interface.......................................................................... 21
Circuit Description......................................................................... 24
Analog Input Channel ............................................................... 24
Instrumentation Amplifier........................................................ 24
Bipolar/Unipolar Configuration .............................................. 24
Data Output Coding .................................................................. 24
Burnout Currents ....................................................................... 25
Excitation Currents .................................................................... 25
Bias Voltage Generator .............................................................. 25
Reference ..................................................................................... 25
Reset ............................................................................................. 25
AVDD Monitor ............................................................................. 26
Calibration................................................................................... 26
Grounding and Layout .............................................................. 26
Applications Information .............................................................. 28
Temperature Measurement using a Thermocouple............... 28
Temperature Measurement using an RTD.............................. 29
Outline Dimensions ....................................................................... 30
Ordering Guide .......................................................................... 30
4/05—Rev. 0 to Rev. A
Changes to Absolute Maximum Ratings........................................8
Changes to Figure 17.......................................................................22
Changes to Data Output Coding Section.....................................24
Changes to Calibration Section .....................................................26
Changes to Ordering Guide ...........................................................30
10/04—Revision 0: Initial Version
Rev. B | Page 2 of 32


Part Number AD7793
Description (AD7792 / AD7793) 16/24-Bit Sigma-Delta ADC
Maker Analog Devices
Total Page 30 Pages
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