AD7391 Datasheet, PDF (1/12 Pages) Analog Devices – +3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs

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+3 Volt Serial-Input
Micropower 10-Bit & 12-Bit DACs
AD7390/AD7391
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
APPLICATIONS
Automotive 0.5 V to 4.5 V Output Span Voltage
Portable Communications
Digitally Controlled Calibration
GENERAL DESCRIPTION
The AD7390/AD7391 family of 10-bit & 12-bit voltage-output
digital-to-analog converters is designed to operate from a single
Ï©3 V supply. Built using a CBCMOS process, these monolithic
DACs offer the user low cost, and ease-of-use in single-supply
Ï©3 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.
The full-scale voltage output is determined by the external ref-
erence input voltage applied. The rail-to-rail REF_IN to DAC_OUT
allows for a full-scale voltage set equal to the positive supply
V_DD or any value in between.
FUNCTIONAL DIAGRAM
REF
CLR
LD
CLK
SDI
AD7390
12-BIT DAC
12
DAC REGISTER
EN
12
SERIAL REGISTER
V_DD
V_OUT
GND
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.
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.
1.00
AD7390
0.75
V_DD = +3.0V
0.50
0.25
0.00
0.25
0.50
T_A = 55 C, 25 C, 85 C
SUPERIMPOSED
0.75
1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE – Decimal
2.0
AD7390
1.5
1.0
25؇, 85؇C
V_DD = +3.0V
V_REF = +2.5V
0.5
0.0
؊0.5
؊1.0
؊55؇
؊1.5
؊2.0
0
512 1024 1536 2048 2560 3072 2584 4096
CODE – Decimal
Figure 1. Differential Nonlinearity Error vs. Code
REV. 0
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.
Figure 2. INL Error vs. Code & Temperature
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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