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Analog Devices Semiconductor Electronic Components Datasheet

AD5645R Datasheet

(AD5625x - AD5665x) nanoDACs

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AD5645R pdf
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Preliminary Technical Data
Quad, 12-/14-/16-Bit nanoDACs® with
5ppm/°C On-chip Ref, I2C Interface
AD5625R/AD5645R/AD5665R
AD5625/AD5665
FEATURES
Low power, smallest pin-compatible, quad nanoDACs
AD5625R/AD5645R/AD5665R
12-/14-/16 bits
On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
AD5625/AD5665
12-/16 bits
External reference only
3 mm x 3 mm LFCSP and 14-lead TSSOP
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to zero scale/midscale
Per channel power-down
I2C-compatible serial interface supports standard (100 kHz),
fast (400 kHz), and high speed (3.4 MHz) modes
APPLICATIONS
Process control
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
GENERAL DESCRIPTION
The AD5625R/AD5645R/AD5665R, AD5625/AD5665
members of the nanoDAC family, are low power, quad, 12-, 14-,
16-bit buffered voltage-out DACs with/without an on-chip
reference. All devices operate from a single 2.7 V to 5.5 V
supply, are guaranteed monotonic by design and have an I2C-
compatible serial interface .
The AD5625R/AD5645R/AD5665R have an on-chip reference. The
AD56x5RBCPZ have a 1.25 V, 5 ppm/°C reference, giving a full-scale
output range of 2.5 V; the AD56x5RBRUZ have a 2.5 V, 5 ppm/°C
reference giving a full-scale output range of 5 V. The on-chip
reference is off at power-up, allowing the use of an external reference.
The internal reference is enabled via a software write. The AD5665
and AD5625 require 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 or midscale and remains there
Rev. PrA
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.
VDD
AD5625R/AD5645R/AD5665R
GND
VREFIN/VREFOUT
1.25V/2.5V REF
ADDR1
ADDR2
SCL
SDA
INTERFACE
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC A
BUFFER
V O U TA
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
VOUTB
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
VOUTC
INPUT
REGISTER
DAC
REGISTER
POWER-ON
RESET
STRING
DAC D
BUFFER
P OW E R -D OW N
LOGIC
VO U TD
LDAC CLR
POR
NOTE. THE FOLLOWING PINS ARE AVAILABLE ONLY ON 14-PIN PACKAGE - ADDR2, LDAC, CLR, POR.
VDD
GND
VREFIN
AD5625/AD5665
ADDR1
ADDR2
SCL
SDA
INTERFACE
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC A
BUFFER
V O U TA
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
VOUTB
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
VOUTC
INPUT
REGISTER
DAC
REGISTER
POWER-ON
RESET
STRING
DAC D
BUFFER
P OW E R -D OW N
LOGIC
VO U TD
LDAC CLR
POR
NOTE. THE FOLLOWING PINS ARE AVAILABLE ONLY ON 14-PIN PACKAGE - ADDR2, LDAC, CLR, POR.
Figure 1. Functional Block Diagrams
until a valid write takes place. The part contains a per-channel
power-down feature that reduces the current consumption of
the device to 480 nA at 5 V and provides software-selectable
output loads while in power-down mode. The low power
consumption of this part in normal operation makes it ideally
suited to portable battery-operated equipment. The on-chip
precision output amplifier enables rail-to-rail output swing.
The AD5625R/AD5645R/AD5665R, AD5625/AD5665 use a 2-
wire I2C-compatible serial interface that operates in standard
(100 kHz), fast (400 kHz), and high speed (3.4 MHz) modes.
Table 1. Related Devices
Part No.
AD5624R/AD5644R/AD5664R
AD5624/AD5664
AD5627R/AD5647R/AD5667R
AD5627/5667,
AD5666
Description
Quad SPI 12-, 14-, 16-bit DACs,
with/without internal reference.
Dual I2C 12-, 14-,16-bit DACs,
with/without internal reference.
2.7 V to 5.5 V, Quad 16-bit DAC,
internal reference, SPI interface
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

AD5645R Datasheet

(AD5625x - AD5665x) nanoDACs

No Preview Available !

AD5645R pdf
AD5625R/AD5645R/AD5665R, AD5625/AD5665
Preliminary Technical Data
TABLE OF CONTENTS
Features................................................................................... 1
Applications ...........................................................................1
General Description .............................................................1
Product Highlights................................................................1
Table1. Related Devices ........................................................2
TABLE OF CONTENTS ......................................................2
Specifications .........................................................................3
AC Characteristics ................................................................4
I2C Timing Specifications.....................................................5
Absolute Maximum Ratings ................................................7
Pin Configuration and Function Descriptions..................8
Typical Performance Characteristics ..................................9
Terminology ........................................................................... 17
Theory of Operation .............................................................19
D/A Section............................................................................19
Resistor String........................................................................19
Output Amplifier...................................................................19
Internal Reference .................................................................19
External Reference ................................................................19
Serial Interface .......................................................................19
Write Operation.....................................................................21
Read Operation......................................................................21
High Speed Mode ..................................................................22
Multiple Byte Write ...............................................................23
Broadcast Mode .....................................................................23
Input Shift Register................................................................23
Write Commands and LDAC...............................................24
LDAC Setup............................................................................24
LDAC Pin.................................................................................25
Power-Down Modes..............................................................25
Power-on Reset and Software Reset ....................................26
Internal Reference Setup.......................................................26
Clear Pin (CLR) .....................................................................26
Applications............................................................................27
Using A Reference as Power Supply ....................................27
Bipolar Operation..................................................................27
Power Supply Bypassing and Grounding ...........................27
Outline Dimensions ..............................................................28
Ordering Information ...........................................................29
REVISION HISTORY
4/06—Revision 0: Initial Version
Rev. PrA. | Page 2 of 32


Part Number AD5645R
Description (AD5625x - AD5665x) nanoDACs
Maker Analog Devices
Total Page 30 Pages
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