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Analog Devices Semiconductor Electronic Components Datasheet

AD5680 Datasheet

5 V 18-Bit nanoDAC

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AD5680 pdf
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FEATURES
Single 18-bit nanoDAC
18-bit monotonic
12-bit accuracy guaranteed
Tiny 8-lead SOT-23 package
Power-on reset to zero scale/midscale
4.5 V to 5.5 V power supply
Serial interface
Rail-to-rail operation
SYNC interrupt facility
Temperature range −40°C to +105°C
APPLICATIONS
Closed-loop process control
Low bandwidth data acquisition systems
Portable battery-powered instruments
Gain and offset adjustment
Precision setpoint control
GENERAL DESCRIPTION
The AD5680, a member of the nanoDAC family, is a single,
18-bit buffered voltage-out DAC that operates from a single
4.5 V to 5.5 V supply and is 18-bit monotonic.
The AD5680 requires an external reference voltage to set the
output range of the DAC. The part incorporates a power-on
reset circuit that ensures the DAC output powers up to 0 V
(AD5680-1) or to midscale (AD5680-2) and remains there until
a valid write takes place.
The low power consumption of this part in normal operation
makes it ideally suited to portable battery-operated equipment.
The power consumption is 1.6 mW at 5 V.
The AD5680 on-chip precision output amplifier allows rail-to-
rail output swing to be achieved. For remote sensing applications,
the output amplifier’s inverting input is available to the user.
The AD5680 uses a versatile 3-wire serial interface that operates
at clock rates up to 30 MHz, and is compatible with standard
SPI®, QSPI™, MICROWIRE™, and DSP interface standards.
5 V 18-Bit nanoDACTM
in a SOT-23
AD5680
FUNCTIONAL BLOCK DIAGRAM
VREF
GND
VDD
POWER-ON
RESET
DAC
REGISTER
REF(+)
18-BIT
DAC
OUTPUT
BUFFER
VFB
VOUT
INPUT
CONTROL
LOGIC
SYNC SCLK DIN
Figure 1.
AD5680
PRODUCT HIGHLIGHTS
1. 18 bits of resolution.
2. 12-bit accuracy guaranteed for 18-bit DAC.
3. Available in an 8-lead SOT-23.
4. Low power. Typically consumes 1.6 mW at 5 V.
5. Power-on reset to zero scale or to midscale.
RELATED DEVICES
AD5662 16-bit DAC in SOT-23.
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. 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
©2006 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5680 Datasheet

5 V 18-Bit nanoDAC

No Preview Available !

AD5680 pdf
AD5680
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Related Devices ................................................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Characteristics..................................................................... 4
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Description .............................. 6
Typical Performance Characteristics ............................................. 7
Terminology .................................................................................... 10
Theory of Operation ...................................................................... 11
DAC Section................................................................................ 11
Resistor String ............................................................................. 11
REVISION HISTORY
6/06—Revision 0: Initial Version
Output Amplifier........................................................................ 11
Interpolator Architecture .......................................................... 11
Serial Interface ............................................................................ 12
Input Shift Register .................................................................... 12
SYNC Interrupt .......................................................................... 12
Power-On Reset.......................................................................... 12
Microprocessor Interfacing....................................................... 13
Applications..................................................................................... 14
Closed-Loop Applications ........................................................ 14
Filter ............................................................................................. 14
Choosing a Reference for the AD5680.................................... 15
Using a Reference as a Power Supply for the AD5680 .......... 16
Using the AD5680 with a Galvanically Isolated Interface .... 16
Power Supply Bypassing and Grounding................................ 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
Rev. 0 | Page 2 of 20


Part Number AD5680
Description 5 V 18-Bit nanoDAC
Maker Analog Devices
Total Page 20 Pages
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