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Analog Devices Semiconductor Electronic Components Datasheet

AD5045 Datasheet

(AD5025 - AD5065) DAC SPI Interface

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AD5045 pdf
Fully Accurate, 12-/14-/16-Bit, Dual, VOUT
nanoDAC SPI Interface, 4.5 V to 5.5 V in a TSSOP
AD5025/AD5045/AD5065
FEATURES
Low power dual 12-/14-/16-bit DAC, ±1 LSB INL
Individual voltage reference pins
Rail-to-rail operation
4.5 V to 5.5 V power supply
Power-on reset to zero scale or midscale
Power down to 400 nA @ 5 V
3 power-down functions
Per channel power-down
Low glitch upon power-up
Hardware power-down lockout capability
Hardware LDAC with software LDAC override function
CLR function to programmable code
SDO daisy-chaining option
14-lead TSSOP
APPLICATIONS
Process controls
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
GENERAL DESCRIPTION
The AD5025/AD5045/AD5065 are low power, dual 12-/14-/16-bit
buffered voltage output nanoDAC® DACs offering relative accuracy
specifications of ±1 LSB INL with individual reference pins, and
can operate from a single 4.5 V to 5.5 V supply. The AD5025/
AD5045/AD5065 also offer a differential accuracy specification of
±1 LSB. The parts use a versatile 3-wire, low power Schmitt
trigger serial interface that operates at clock rates up to 50 MHz
and is compatible with standard SPI®, QSPI™, MICROWIRE™,
and DSP interface standards. The reference for the AD5025/
AD5045/AD5065 are supplied from an external pin and a refer-
ence buffer is provided on chip. The AD5025/AD5045/AD5065
incorporate a power-on reset circuit that ensures the DAC output
powers up zero scale or midscale and remains there until a valid
write takes place to the device. The AD5025/AD5045/AD5065
contain a power-down feature that reduces the current consump-
tion of the device to typically 400 nA at 5 V and provides software
selectable output loads while in power-down mode. The parts are
put into power-down mode over the serial interface. Total unad-
justed error for the parts is <2.5 mV. The parts exhibit very low
glitch on power-up. The outputs of all DACs can be updated
simultaneously using the LDAC function, with the added
functionality of user-selectable DAC channels to simultaneously
update. There is also an asynchronous CLR that clears all DACs
to a software-selectable code—0 V, midscale, or full scale. The
parts also feature a power-down lockout pin, PDL, which can be
used to prevent the DAC from entering power-down under any
circumstances over the serial interface.
PRODUCT HIGHLIGHTS
1. Dual channel available in a 14-lead TSSOP package with
individual voltage reference pins.
2. 12-/14-/16-bit accurate, ±1 LSB INL.
3. Low glitch on power-up.
4. High speed serial interface with clock speeds up to 50 MHz.
5. Three power-down modes available to the user.
6. Reset to known output voltage (zero scale or midscale).
7. Power-down lockout capability.
Table 1. Related Devices
Part No.
Description
AD5666
Quad,16-bit buffered DAC, 16 LSB INL, TSSOP
AD5024/AD5044/AD5064 Quad 16-bit nanoDAC, 1 LSB INL, TSSOP
AD5062/AD5063
16-bit nanoDAC, 1 LSB INL, MSOP
AD5061
16-bit nanoDAC, 4 LSB INL, SOT-23
AD5040/AD5060
14-/16-bit nanoDAC, 1 LSB INL, SOT-23
FUNCTIONAL BLOCK DIAGRAM
POR
VDD
VREFA VREFB
SCLK
SYNC
DIN
LDAC
SDO
LDAC
INPUT
REGISTER
INTERFACE
LOGIC
INPUT
REGISTER
DAC
REGISTER
DAC
REGISTER
DAC A
DAC B
PDL CLR
AD5025/AD5045/AD5065
Figure 1.
BUFFER
BUFFER
POWER-DOWN
LOGIC
GND
VOUTA
VOUTB
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
©2008 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5045 Datasheet

(AD5025 - AD5065) DAC SPI Interface

No Preview Available !

AD5045 pdf
AD5025/AD5045/AD5065
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Product Highlights ........................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
AC Characteristics........................................................................ 4 
Timing Characteristics ................................................................ 5 
Absolute Maximum Ratings............................................................ 7 
ESD Caution.................................................................................. 7 
Pin Configuration and Function Descriptions............................. 8 
Typical Performance Characteristics ............................................. 9 
Terminology .................................................................................... 15 
Theory of Operation ...................................................................... 17 
Digital-to-Analog Converter .................................................... 17 
DAC Architecture....................................................................... 17 
Reference Buffer ......................................................................... 17 
Output Amplifier........................................................................ 17 
Serial Interface ............................................................................ 17 
REVISION HISTORY
10/08—Revision 0: Initial Version
Input Register.............................................................................. 17 
Standalone Mode........................................................................ 19 
SYNC Interrupt .......................................................................... 19 
Daisy-Chaining........................................................................... 19 
Power-On Reset and Software Reset ....................................... 20 
Power-Down Modes .................................................................. 20 
Clear Code Register ................................................................... 21 
LDAC Function........................................................................... 21 
Power-Down Lockout................................................................ 22 
Power Supply Bypassing and Grounding................................ 22 
Microprocessor Interfacing....................................................... 23 
Applications Information .............................................................. 24 
Using a Reference as a Power Supply for the
AD5025/AD5045/AD5065 ....................................................... 24 
Bipolar Operation Using the AD5025/AD5045/AD5065..... 24 
Using the AD5025/AD5045/AD5065 with a
Galvanically Isolated Interface ................................................. 24 
Outline Dimensions ....................................................................... 25 
Ordering Guide .......................................................................... 25 
Rev. 0 | Page 2 of 28


Part Number AD5045
Description (AD5025 - AD5065) DAC SPI Interface
Maker Analog Devices
Total Page 28 Pages
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