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AD5678 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD5678
Description  On-Chip Reference in 14-Lead TSSOP
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5678 Datasheet(HTML) 1 Page - Analog Devices

 
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4 × 12-Bit and 4 × 16-Bit Octal DAC with
On-Chip Reference in 14-Lead TSSOP
AD5678
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2005–2011 Analog Devices, Inc. All rights reserved.
FEATURES
Low power octal DAC with
Four 16-bit DACs
Four 12-bit DACs
14-lead/16-lead TSSOP
On-chip 1.25 V/2.5 V, 5 ppm/°C reference
Power down to 400 nA @ 5 V, 200 nA @ 3 V
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to zero scale
3 power-down functions
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
Digital gain and offset adjustment
Programmable voltage current sources
Programmable attenuators
FUNCTIONAL BLOCK DIAGRAM
INTERFACE
LOGIC
INPUT
REGISTER
DIN
LDAC
GND
VOUTH
VDD
LDAC1
VREFIN/VREFOUT
SYNC
SCLK
AD5678
CLR1
1RU-16 PACKAGE ONLY
1.25V/2.5V
REF
VOUTA
VOUTB
VOUTC
VOUTD
VOUTE
VOUTF
VOUTG
DAC
REGISTER
STRING
DAC A
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC D
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC E
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC F
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC G
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC H
BUFFER
POWER-DOWN
LOGIC
POWER-ON
RESET
Figure 1.
GENERAL DESCRIPTION
The AD5678 is a low power, octal, buffered voltage-output
DAC with four 12-bit DACs and four 16-bit DACs in a single
package. All devices operate from a single 2.7 V to 5.5 V supply
and are guaranteed monotonic by design.
The AD5678 has an on-chip reference with an internal gain of 2.
The AD5678-1 has a 1.25 V 5 ppm/°C reference, giving a full-
scale output of 2.5 V; the AD5678-2 has a 2.5 V 5 ppm/°C
reference, giving a full-scale output of 5 V. The on-board
reference is off at power-up, allowing the use of an external
reference. The internal reference is enabled via a software write.
The part incorporates a power-on reset circuit that ensures that
the DAC output powers up to 0 V and remains powered up at
this level until a valid write takes place. The part contains a
power-down feature that reduces the current consumption of
the device to 400 nA at 5 V and provides software-selectable
output loads while in power-down mode for any or all DAC
channels.
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 AD5678 utilizes a versatile 3-wire serial interface that
operates at clock rates of up to 50 MHz and is compatible with
standard SPI®, QSPI™, MICROWIRE™, and DSP interface
standards. The on-chip precision output amplifier enables rail-
to-rail output swing.
PRODUCT HIGHLIGHTS
1.
Octal DAC (four 12-bit DACs and four 16-bit DACs).
2.
On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
3.
Available in 14-lead/16-lead TSSOP.
4.
Power-on reset to 0 V.
5.
Power-down capability. When powered down, the DAC
typically consumes 200 nA at 3 V and 400 nA at 5 V.


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