Octal, 16-Bit DAC with 5 ppm/C
On-Chip Reference in 14-Lead TSSOP
Data Sheet
AD5668-EP
FEATURES FUNCTIONAL BLOCK DIAGRAM
V /V
V REFIN REFOUT
DD
Enhanced product features
AD5668-EP
1.25V/2.5V
Supports defense and aerospace applications (AQEC)
REF
BUFFER
Military temperature range (55C to +125C)
INPUT DAC STRING
LDAC V A
OUT
REGISTER REGISTER DAC A
Controlled manufacturing baseline
BUFFER
INPUT DAC STRING
V B
OUT
REGISTER REGISTER DAC B
One assembly/test site
BUFFER
INPUT DAC STRING
SCLK V C
OUT
One fabrication site REGISTER DAC C
REGISTER
BUFFER
INTERFACE
Enhanced product change notification INPUT DAC STRING
SYNC
LOGIC V D
OUT
REGISTER REGISTER DAC D
Qualification data available on request
BUFFER
INPUT DAC STRING
DIN
V E
OUT
REGISTER REGISTER DAC E
Low power, smallest pin-compatible octal DAC: 16 bits
BUFFER
INPUT DAC STRING
V F
OUT
REGISTER REGISTER DAC F
16-lead TSSOP
BUFFER
INPUT DAC STRING
On-chip 1.25 V, 5 ppm/C reference
V G
REGISTER DAC G OUT
REGISTER
Power down to 400 nA at 5 V, 200 nA at 3 V
BUFFER
INPUT DAC STRING
V H
OUT
REGISTER REGISTER DAC H
2.7 V to 5.5 V power supply
POWER-DOWN
POWER-ON
LOGIC
RESET
Guaranteed monotonic by design
1 1 GND
LDAC CLR
Power-on reset to zero scale or midscale
1
RU-16 PACKAGE ONLY
3 power-down functions
Figure 1.
Hardware LDAC and LDAC override function
CLR function to programmable code
Rail-to-rail operation
APPLICATIONS
Process control
Data acquisition systems
Portable battery-powered instruments
GENERAL DESCRIPTION
DAC channels to simultaneously update. There is also an
The AD5668-EP is a low power, octal, 16-bit, buffered voltage-
asynchronous CLR that updates all DACs to a user-
output digital-to-analog converter (DAC). It operates from a
programmable codezero scale, midscale, or full scale.
single 2.7 V to 5.5 V supply and is guaranteed monotonic
by design.
The AD5668-EP uses a versatile 3-wire serial interface that
operates at clock rates up to 50 MHz and is compatible with
The AD5668-EP has an on-chip reference with an internal gain
standard SPI, QSPI, MICROWIRE, and DSP interface standards.
of 2. The AD5668-EP has a 1.25 V, 5 ppm/C reference, giving a
full-scale output range of 2.5 V. The on-board reference is off at
Additional application and technical information can be found
power-up, allowing the use of an external reference, and the
in the AD5668 data sheet.
internal reference is enabled via a software write.
PRODUCT HIGHLIGHTS
The part incorporates a power-on-reset circuit that ensures that
1. Octal, 16-bit DAC.
the DAC output powers up to 0 V and remains powered up at this
2. On-chip 1.25 V/2.5 V, 5 ppm/C reference.
level until a valid write takes place. The part contains a power-
3. Available in 16-lead TSSOP.
down feature that reduces the current consumption of the device
4. Power-on reset to 0 V or midscale.
to 400 nA at 5 V and provides software-selectable output loads
5. Power-down capability. When powered down, the DAC
while in power-down mode for any or all DAC channels. The
typically consumes 200 nA at 3 V and 400 nA at 5 V.
outputs of all DACs can be updated simultaneously using the
LDAC function, with the added functionality of user-selectable
Rev. A Document Feedback
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09463-001AD5668-EP Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Timing Characteristics .................................................................5
Applications ....................................................................................... 1 Absolute Maximum Ratings ............................................................6
Functional Block Diagram .............................................................. 1 ESD Caution...................................................................................6
General Description ......................................................................... 1 Pin Configurations and Function Descriptions ............................7
Product Highlights ........................................................................... 1 Typical Performance Characteristics ..............................................8
Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 14
Specif icat ions ..................................................................................... 3 Ordering Guide .......................................................................... 14
AC Characteristics ........................................................................ 4
REVISION HISTORY
1/15Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 14
10/10Revision 0: Initial Version
Rev. A | Page 2 of 14