AD8522ARZ Datasheet, PDF (1/8 Pages) Analog Devices – +5 Volt, Serial Input, Dual 12-Bit DAC

a
FEATURES
Complete Dual 12-Bit DAC
No External Components
+5 V Single-Supply Operation ؎10%
4.095 V Full Scale (1 mV/LSB)
Buffered Voltage Outputs
Low Power: 5 mW/DAC
Space Saving 1.5 mm Height SO-14 Package
APPLICATIONS
Digitally Controlled Calibration
Servo Controls
Process Control Equipment
Computer Peripherals
Portable Instrumentation
Cellular Base Stations Voltage Adjustment
+5 Volt, Serial Input,
Dual 12-Bit DAC
AD8522
FUNCTIONAL BLOCK DIAGRAM
V_DD
CS
CLK
CLK
LATCH
SDI
(DATA)
SHIFT
REGISTER
DAC A
REGISTER
D
12
DAC A
12
BANDGAP
REFERENCE
OP
AMP
A
REF
BUF
SDO
LDA
CONTROL
LDB
LOGIC
D
DAC B
REGISTER
12
REF
BUF
DAC B
AD8522
OP
AMP
B
DGND
MSB RS
AGND
V_OUTA
V_REF
V_OUTB
GENERAL DESCRIPTION
The AD8522 is a complete dual 12-bit, single-supply, voltage
output DAC in a 14-pin DIP, or SO-14 surface mount package.
Fabricated in a CBCMOS process, features include a serial digi-
tal interface, onboard reference, and buffered voltage output.
Ideal for +5 V-only systems, this monolithic device offers low
cost and ease of use, and requires no external components to
realize the full performance of the device.
The serial digital interface allows interfacing directly to numer-
ous microcontroller ports, with a simple high speed, three-wire
data, clock, and load strobe format. The 16-bit serial word con-
tains the 12-bit data word and DAC select address, which is de-
coded internally or can be decoded externally using LDA, LDB
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
VDD = +4.5V
T_A = –55°C, +25°C, +85°C, +125°C
+25°C
–55°C
+85°C
+125°C
1024
2048
3072
4096
DIGITAL INPUT CODE – Decimal
Figure 1. Linearity Error vs. Digital Code & Temperature
inputs. A serial data output allows the user to easily daisy-chain
multiple devices in conjunction with a chip select input. A reset
RS input sets the outputs to zero scale or midscale, as deter-
mined by the input MSB.
The output 4.095 V full scale is laser trimmed to maintain accu-
racy over the operating temperature range of the device, and
gives the user an easy-to-use one-millivolt-per-bit resolution. A
2.5 V reference output is also available externally for other data
acquisition circuitry, and for ratiometric applications. The out-
put buffers are capable of driving ± 5 mA.
The AD8522 is available in the 14-pin plastic DIP and low pro-
file 1.5 mm SOIC-14 packages.
PACKAGE TYPES AVAILABLE
SO-14
PDIP-14
REV. A
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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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