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Analog Devices Semiconductor Electronic Components Datasheet

AD5325 Datasheet

8-/10-/12-Bit DACs

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AD5325 pdf
2.5 V to 5.5 V, 500 μA, 2-Wire Interface
Quad Voltage Output, 8-/10-/12-Bit DACs
AD5305/AD5315/AD5325
FEATURES
GENERAL DESCRIPTION
AD5305: 4 buffered 8-bit DACs in 10-lead MSOP
A version: ±1 LSB INL, B version: ±0.625 LSB INL
AD5315: 4 buffered 10-bit DACs in 10-lead MSOP
A version: ±4 LSB INL, B version: ±2.5 LSB INL
AD5325: 4 buffered 12-bit DACs in 10-lead MSOP
A version: ±16 LSB INL, B version: ±10 LSB INL
Low power operation: 500 μA @ 3 V, 600 μA @ 5 V
2-wire (I2C®-compatible) serial interface
2.5 V to 5.5 V power supply
Guaranteed monotonic by design over all codes
Power-down to 80 nA @ 3 V, 200 nA @ 5 V
Three power-down modes
The AD5305/AD5315/AD53251 are quad 8-, 10-, and 12-bit
buffered voltage output DACs in a 10-lead MSOP that operate
from a single 2.5 V to 5.5 V supply, consuming 500 μA at 3 V.
Their on-chip output amplifiers allow rail-to-rail output swing
with a slew rate of 0.7 V/μs. A 2-wire serial interface that
operates at clock rates up to 400 kHz is used. This interface is
SMBus compatible at VDD < 3.6 V. Multiple devices can be
placed on the same bus.
The references for the four DACs are derived from one
reference pin. The outputs of all DACs can be updated
simultaneously using the software LDAC function.
Double-buffered input logic
Output range: 0 V to VREF
Power-on reset to 0 V
Simultaneous update of outputs (LDAC function)
Software clear facility
Data readback facility
On-chip rail-to-rail output buffer amplifiers
The parts incorporate a power-on reset circuit, which ensures
that the DAC outputs power up to 0 V and remain there until a
valid write takes place to the device. There is also a software
clear function to reset all input and DAC registers to 0 V. The
parts contain a power-down feature that reduces the current
consumption of the devices to 200 nA @ 5 V (80 nA @ 3 V).
Temperature range: −40°C to +105°C
The low power consumption of these parts in normal operation
makes them ideally suited for portable battery-operated equip-
APPLICATIONS
Portable battery-powered instruments
ment. The power consumption is 3 mW at 5 V, 1.5 mW at 3 V,
reducing to 1 μW in power-down mode.
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
1 Protected by U.S. Patent No. 5,969,657 and 5,684,481.
Industrial process control
FUNCTIONAL BLOCK DIAGRAM
VDD REF IN
LDAC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC A
BUFFER
VOUTA
SCL
SDA
A0
INTERFACE
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
VOUTB
VOUTC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC D
BUFFER
VOUTD
POWER-ON
RESET
AD5305/AD5315/AD5325
POWER-DOWN
LOGIC
GND
Figure 1.
Rev. G
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

AD5325 Datasheet

8-/10-/12-Bit DACs

No Preview Available !

AD5325 pdf
AD5305/AD5315/AD5325
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AC Characteristics........................................................................ 5
Timing Characteristics ................................................................ 5
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 13
Functional Description .................................................................. 15
Digital-to-Analog Section ......................................................... 15
Resistor String ............................................................................. 15
DAC Reference Inputs ............................................................... 15
Output Amplifier........................................................................ 15
Power-On Reset .......................................................................... 15
Serial Interface ............................................................................ 16
Read/Write Sequence................................................................. 16
Pointer Byte Bits ......................................................................... 16
Input Shift Register .................................................................... 16
Default Readback Condition .................................................... 17
Multiple-DAC Write Sequence................................................. 17
Multiple-DAC Readback Sequence ......................................... 17
Write Operation.......................................................................... 17
Read Operation........................................................................... 17
Double-Buffered Interface ........................................................ 18
Power-Down Modes .................................................................. 18
Applications..................................................................................... 20
Typical Application Circuit....................................................... 20
Bipolar Operation....................................................................... 20
Multiple Devices on One Bus ................................................... 20
AD5305/AD5315/AD5325 as a Digitally Programmable
Window Detector ....................................................................... 21
Coarse and Fine Adjustment Using the
AD5305/AD5315/AD5325 ....................................................... 21
Power Supply Decoupling ......................................................... 21
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
REVISION HISTORY
5/06—Rev. F to Rev. G
Updated Format..................................................................Universal
Changes to Ordering Guide .......................................................... 24
10/04—Rev. E to Rev. F
Changes to Figure 6........................................................................ 11
Changes to Pointer Byte Bits Section ........................................... 12
Changes to Figure 7........................................................................ 12
8/03—Rev. D to Rev. E
Added A Version.................................................................Universal
Changes to Features.......................................................................... 1
Changes to Specifications ................................................................ 2
Changes to Absolute Maximum Ratings ....................................... 5
Changes to Ordering Guide ............................................................ 5
Changes to TPC 21......................................................................... 10
Added Octals Section to Table II.................................................. 18
Updated Outline Dimensions....................................................... 19
4/01—Rev. C to Rev. D
Edit to Features Section ....................................................................1
Edit to Figure 6 ..................................................................................1
Edits to Right/Left and Double Sections
of Pointer Byte Bits Section........................................................... 11
Edit to Input Shift Register Section.............................................. 12
Edit to Multiple-DAC Readback Sequence Section................... 12
Edits to Figure 7.............................................................................. 12
Edits to Write Operation section.................................................. 13
Edits to Figure 8.............................................................................. 13
Edits to Read Operation section................................................... 14
Edits to Figure 9.............................................................................. 14
Edits to Power-Down Modes section .......................................... 15
Edits to Figure 12............................................................................ 16
Rev. G | Page 2 of 24


Part Number AD5325
Description 8-/10-/12-Bit DACs
Maker Analog Devices
Total Page 24 Pages
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