a
FEATURES
Single Chip Construction
On-Board Output Amplifier
Low Power Dissipation: 300 mW
Monotonicity Guaranteed over Temperature
Guaranteed for Operation with 12 V Supplies
Improved Replacement for Standard DAC80, DAC800
Hl-5680
High Stability, High Current Output
Buried Zener Reference
Laser Trimmed to High Accuracy
1/2 LSB Max Nonlinearity
Low Cost Plastic Packaging
Complete Low Cost
12-Bit D/A Converters
ADDAC80/ADDAC85/ADDAC87
FUNCTIONAL BLOCK DIAGRAM
(MSB) BIT 1
1
BIT 2
2
24
V
REF
OUT
GAIN ADJUST
+V
S
COMMON
SUMMING JUNCTION
20V RANGE
10V RANGE
BIPOLAR OFFSET
REF INPUT
V
OUT
–V
S
NC/+V
L
*
BIT 3
3
BIT 4
4
BIT 5
5
BIT 6
6
BIT 7
7
BIT 8
8
REF
CONTROL
CIRCUIT
12-BIT
RESISTOR
LADDER
NETWORK
AND
CURRENT
SWITCHES
23
22
21
20
5k
5k
19
18
17
BIT 9
9
BIT 10
10
BIT 11
11
(LSB) BIT 12
12
6.3k
–
16
15
+
14
ADDAC80
*NC
= CBI VERSIONS
5V – CCD VERSIONS
13
PRODUCT DESCRIPTION
The ADDAC80 Series is a family of low cost 12-bit digital-to-
analog converters with both a high stability voltage reference
and output amplifier combined on a single monolithic chip.
The ADDAC80 Series is recommended for all low cost 12-bit D/A
converter applications where reliability and cost are of paramount
importance.
Advanced circuit design and precision processing techniques
result in significant performance advantages over conventional
DAC80 devices. Innovative circuit design reduces the total
power consumption to 300 mW, which not only improves reli-
ability, but also improves long term stability.
The ADDAC80 incorporates a fully differential, nonsaturating
precision current switching cell structure which provides greatly
increased immunity to supply voltage variation. This same struc-
ture also reduces nonlinearities due to thermal transients as the
various bits are switched; nearly all critical components operate
at constant power dissipation. High stability, SiCr thin film
resistors are trimmed with a fine resolution laser, resulting in
lower differential nonlinearity errors. A low noise, high stability,
subsurface Zener diode is used to produce a reference voltage
with excellent long term stability, high external current capabil-
ity and temperature drift characteristics which challenge the
best discrete Zener references.
The ADDAC80 Series is available in three performance grades
and three package types. The ADDAC80 is specified for use
over the 0°C to 70°C temperature range and is available in
both plastic and ceramic DIP packages. The ADDAC85 and
ADDAC87 are available in hermetically sealed ceramic packages
and are specified for the –25°C to +85°C and –55°C to +125°C
temperature ranges.
REV. B
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
(MSB) BIT 1
1
BIT 2
2
BIT 3
3
BIT 4
4
BIT 5
5
24
V
REF
OUT
REF
CONTROL
CIRCUIT
12-BIT
RESISTOR
LADDER
NETWORK
AND
CURRENT
SWITCHES
23
GAIN ADJUST
22
+V
S
21
COMMON
20
SCALING NETWORK
BIT 6
6
BIT 7
7
BIT 8
8
BIT 9
9
BIT 10
10
BIT 11
11
(LSB) BIT 12
12
2k
5k
5k
6.3k
19
SCALING NETWORK
18
SCALING NETWORK
17
BIPOLAR OFFSET
16
REF INPUT
15
I
OUT
14
–V
S
13
NC/+V
L
*
*NC
= CBI VERSIONS
5V – CCD VERSIONS
PRODUCT HIGHLIGHTS
1. The ADDAC80 series of D/A converters directly replaces all
other devices of this type with significant increases in performance.
2. Single chip construction and low power consumption pro-
vides the optimum choice for applications where low cost
and high reliability are major considerations.
3. The high speed output amplifier has been designed to settle
within 1/2 LSB for a 10 V full scale transition in 2.0
µs,
when
properly compensated.
4. The precision buried Zener reference can supply up to 2.5 mA
for use elsewhere in the application.
5. The low TC binary ladder guarantees that all units are mono-
tonic over the specified temperature range.
6. System performance upgrading is possible without redesign.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© Analog Devices, Inc., 2002
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