AD7394 Datasheet, PDF (1/12 Pages) Analog Devices – +3 V, Dual, Serial Input 12-/10-Bit DACs

a
+3 V, Dual, Serial Input
12-/10-Bit DACs
AD7394/AD7395
FEATURES
Micropower: 100 ␮A/DAC
0.1 ␮A Typical Power Shutdown
Single-Supply +2.7 V to +5.5 V Operation
Compact 1.1 mm Height TSSOP-14 Package
AD7394/12-Bit Resolution
AD7395/10-Bit Resolution
Serial Interface with Schmitt Trigger Inputs
APPLICATIONS
Automotive Output Span Voltage
Portable Communications
Digitally Controlled Calibration
PC Peripherals
GENERAL DESCRIPTION
The AD7394/AD7395 family of dual, 12-/10-bit, voltage output
digital-to-analog converters is designed to operate from a single
+3 V supply. Built using a CBCMOS process, this monolithic
DAC offers the user low cost and ease of use in single-supply
+3 V systems. Operation is guaranteed over the supply voltage
range of +2.7 V to +5.5 V making this device ideal for battery
operated applications.
The full-scale output voltage is determined by the applied exter-
nal reference input voltage, VREF. The rail-to-rail VREF input
to V_OUT outputs allows for a full-scale voltage set equal to the
positive supply V_DD or any value in between.
A doubled-buffered serial data interface offers high speed,
microcontroller compatible inputs using serial-data-in (SDI),
clock (CLK) and load strobe (LDA + LDB) pins. A chip-select
(CS) pin simplifies connection of multiple DAC packages by
enabling the clock input when active low. Additionally, an RS
input sets the output to zero scale or to 1/2 scale based on the
logic level applied to the MSB pin. The power shutdown pin,
SHDN, reduces power dissipation to nanoamp current levels.
All digital inputs contain Schmitt-triggered logic levels to mini-
mize power dissipation and prevent false triggering on the clock
input.
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.
FUNCTIONAL BLOCK DIAGRAM
CS
EN
CLK
SDI
(DATA)
R
S
H
I
F
T
E
G
I
S
T
E
R
LDA
LDB
V_DD V_REF
R
D
A
C
E
G
I
S
A
T
E
R
D
PR
12
R
D
D
A
C
E
G
I
S
B
T
E
R
PR
DAC A
OP
AMP A
AD7394/AD7395
DAC B
OP
AMP B
V_OUTA
V_OUTB
DGND
MSB
RS
AGND
SHDN
The AD7394/AD7395 is specified over the extended industrial
(–40°C to +85°C) temperature range. Packages available in-
clude plastic DIP and low profile 1.75 mm height SO-14 surface
mount packages. The AD7395ARU is available for ultracompact
applications in a thin 1.1 mm TSSOP-14 package. For automotive
applications the AD7395AR is specified for operation over the
(–40°C to +125°C) temperature range.
1
V_DD = 3V
0.8
V_REF = 2.5V
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8 ^{TA = –55؇C, +25؇C, +85؇C}
SUPERIMPOSED
–1
0 500 1000 1500 2000 2500
CODE – Decimal
3000
3500
4000
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.
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© Analog Devices, Inc., 1998