FUNCTIONAL BLOCK DIAGRAM
D
A
C
A
R
E
G
I
S
T
E
R
D
PR
En
S
H
I
F
T
R
E
G
I
S
T
E
R D
A
C
B
R
E
G
I
S
T
E
R
D
PR
R
E
F
E
R
E
N
C
E
B
A
N
D
G
A
P
DAC A
DAC B
V
DD
REF
BUF
REF
BUF
AD8303
V
OUTA
V
REF
V
OUTB
CS
CLK
SDI
(DATA)
LDA
LDB
DGND MSB RS AGND SHDN
OP
AMP
A
OP
AMP
B
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.
a
+3 V, Dual, Serial Input
Complete 12-Bit DAC
AD8303
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FEATURES
Complete Dual 12-Bit DAC
Pretrimmed Internal Voltage Reference
Single +3 V Operation
0.5 mV/Bit with 2.0475 V Full Scale
Low Power: 9.6 mW
3-Wire Serial SPI Compatible Interface
Power Shutdown I
DD
< 1 mA
Compact SO-14, 1.75 mm Height Package
APPLICATIONS
Portable Communications
Digitally Controlled Calibration
Servo Controls
PC Peripherals
GENERAL DESCRIPTION
The AD8303 is a complete (includes internal reference) dual,
12-bit, voltage output digital-to-analog converter designed to
operate from a single +3 volt supply. Built using a CBCMOS
process, this monolithic DAC offers the user low cost and ease-
of-use in single-supply +3 volt 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 2.0475 V full-scale voltage output is laser-trimmed to
maintain accuracy over the operating temperature range of the
device. The binary input data format provides an easy-to-use
one-half millivolt-per-bit software programmability. The voltage
outputs are capable of sourcing 3 mA.
DIGITAL INPUT CODE – Decimal
DNL – LSB
1.0
–1.0
0 40961024 2048 3072
0.8
0.2
0
–0.4
–0.8
0.6
0.4
–0.2
–0.6
V
DD
= +5V
T
A
= –40°C, +25°C, +85°C
Figure 1. Differential Nonlinearity Error vs. Code
A double buffered serial data interface offers high speed, three-
wire, DSP and SPI microcontroller compatible inputs using
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 level applied to the MSB pin. A power
shutdown feature reduces power dissipation to less than 3 µW.
The AD8303 is specified over the extended industrial (–40°C to
+85°C) temperature range. AD8303s are available in plastic
DIP and low profile 1.75 mm height SO-14 surface mount
packages. For single-channel DAC applications, see the
AD8300 which is offered in the 8-lead DIP and SO-8 packages.
DIGITAL INPUT CODE – Decimal
INL LINEARITY ERROR – LSB
2
–2
1.5
0
–0.5
–1
–1.5
1
0.5
V
DD
= +5V
0 1024 2048 3072 4096
+25°C
+85°C
–40°C
Figure 2. Linearity Error vs. Digital Code and Temperature