Quad, 12-Bit, Serial Input,
Unipolar/Bipolar, Voltage Output DAC
AD5726
FEATURES
+5 V to 鹵15 V operation
Unipolar or bipolar operation
鹵1 LSB maximum INL error, 鹵1 LSB maximum DNL error
Guaranteed monotonic over temperature
Double-buffered inputs
Simultaneous updating via LDAC
Asynchronous CLR to zero scale/midscale
Operating temperature range: 鈭?0擄C to +125擄C
iCMOS廬
process technology
1
Bipolar outputs are configured by connecting both V
REFP
and
V
REFN
to nonzero voltages. This method of setting output voltage
ranges has advantages over the bipolar offsetting methods
because it is not dependent on internal and external resistors
with different temperature coefficients.
The AD5726 uses a serial interface that operates at clock rates up to
30 MHz and is compatible with DSP and microcontroller interface
standards. Double buffering allows simultaneous updating of all
DACs. The asynchronous CLR function clears all DAC registers
to a user-selectable, zero-scale or midscale output.
The AD5726 is available in 16-lead SSOP and 16-lead SOIC
packages. It can be operated from a wide variety of supply and
reference voltages with supplies ranging from single +5 V to
鹵15 V, and references ranging from +2.5 V to 鹵10 V. Power
dissipation is less than 240 mW with 鹵15 V supplies and only
30 mW with a +5 V supply. Operation is specified over the
temperature range of 鈭?0擄C to +125擄C.
Table 1. Related Devices
Part No.
AD5725
AD5724R/AD5734R/
AD5754R
AD5722R/AD5732R/
AD5752R
Description
Quad, 12-bit, parallel input,
unipolar/bipolar, voltage output DAC.
Complete, quad, 12-/14-/16-bit, serial
input, unipolar/bipolar voltage output
DAC with internal reference.
Complete, dual, 12-/14-/16-bit, serial
input, unipolar/bipolar voltage output
DAC with internal reference.
APPLICATIONS
Industrial automation
Closed-loop servo control, process control
Automotive test and measurement
Programmable logic controllers
GENERAL DESCRIPTION
The AD5726 is a quad, 12-bit, serial input, voltage output
digital-to analog converter that offers guaranteed monotonicity
and integral nonlinearity (INL) of 鹵1 LSB maximum.
Output voltage swing is set by two reference inputs, V
REFP
and
V
REFN
. The DAC offers a unipolar positive output range when
the V
REFN
input is set to 0 V and the V
REFP
input is set to a positive
voltage. A similar configuration with V
REFP
at 0 V and V
REFN
at a
negative voltage provides a unipolar negative output range.
FUNCTIONAL BLOCK DIAGRAM
AV
SS
AV
DD
V
REFP
12
SDIN
SCLK
CS
I/O
REGISTER
AND
CONTROL
LOGIC
INPUT 12
REG A
INPUT 12
REG B
INPUT 12
REG C
INPUT 12
REG D
DAC 12
REG A
DAC 12
REG B
DAC 12
REG C
DAC 12
REG D
DAC A
V
OUTA
DAC B
V
OUTB
DAC C
V
OUTC
DAC D
AD5726
GND
V
OUTD
06469-001
CLR CLRSEL LDAC
V
REFN
Figure 1.
1
For analog systems designers within industrial/instrumentation equipment OEMs who need high performance ICs at higher-voltage levels,
iCMOS
is a technology
platform that enables the development of analog ICs capable of 30 V and operating at 鹵15 V supplies while allowing dramatic reductions in power consumption and
package size, and increased ac and dc performance.
Rev. 0
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