+3 Volt Serial-Input
a
Micropower 10-Bit & 12-Bit DACs
AD7390/AD7391
FUNCTIONAL DIAGRAM
FEATURES
Micropower—100 A
Single-Supply—؉2.7 to ؉5.5 V Operation
Compact 1.75 mm Height SO-8 Package
& 1.1 mm Height TSSOP-8
AD7390—12-Bit Resolution
AD7391—10-Bit Resolution
SPI & QSPI Serial Interface Compatible with Schmitt
Trigger Inputs
AD7390
V
DD
12-BIT DAC
REF
V
OUT
12
DAC REGISTER
12
CLR
LD
GND
EN
APPLICATIONS
Automotive 0.5 V to 4.5 V Output Span Voltage
Portable Communications
CLK
SDI
SERIAL REGISTER
Digitally Controlled Calibration
A doubled-buffered serial-data interface offers high speed,
three-wire, SPI and microcontroller compatible inputs using
data in (SDI), clock (CLK) and load strobe (LD) pins. Addi-
tionally, a CLR input sets the output to zero scale at power on
or upon user demand.
GENERAL DESCRIPTION
The AD7390/AD7391 family of 10-bit & 12-bit voltage-output
digital-to-analog converters is designed to operate from a single
ϩ3 V supply. Built using a CBCMOS process, these monolithic
DACs offer the user low cost, and ease-of-use in single-supply
ϩ3 V systems. Operation is guaranteed over the supply voltage
range of ϩ2.7 V to ϩ5.5 V consuming less than 100 µA making
this device ideal for battery operated applications.
Both parts are offered in the same pinout to allow users to select
the amount of resolution appropriate for their application with-
out circuit card redesign.
The AD7390/AD7391 are specified over the extended industrial
(Ϫ40°C to ϩ85°C) temperature range. The AD7391AR is
specified for the Ϫ40°C to ϩ125°C automotive temperature
range. The AD7390/AD7391s are available in plastic DIP, and
low profile 1.75 mm height SO-8 surface mount packages. The
AD7391ARU is available for ultracompact applications in a thin
1.1 mm TSSOP-8 package.
The full-scale voltage output is determined by the external ref-
erence input voltage applied. The rail-to-rail REFIN to DACOUT
allows for a full-scale voltage set equal to the positive supply
VDD or any value in between.
2.0
1.00
V
V
= +3.0V
= +2.5V
V
= +3.0V
AD7390
AD7390
DD
REF
DD
1.5
1.0
0.75
0.50
0.25
0.00
0.25
0.50
0.75
1.00
25؇, 85؇C
0.5
0.0
؊0.5
؊1.0
؊1.5
؊2.0
؊55؇
T
=
55 C, 25 C, 85 C
A
SUPERIMPOSED
0
512
1024
1536 2048
2560
3072
3584 4096
0
512
1024
1536
2048
2560 3072
2584
4096
CODE – Decimal
CODE – Decimal
Figure 1. Differential Nonlinearity Error vs. Code
REV. 0
Figure 2. INL Error vs. Code & Temperature
© Analog Devices, Inc., 1996
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
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