Complete Low Cost
12-Bit D/A Converters
a
ADDAC80/ADDAC85/ADDAC87
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Single Chip Construction
On-Board Output Amplifier
1
2
24
23
22
21
20
19
18
17
16
15
14
13
(MSB) BIT 1
BIT 2
V
OUT
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
REF
REF
CONTROL
CIRCUIT
GAIN ADJUST
3
BIT 3
+V
S
4
BIT 4
COMMON
12-BIT
RESISTOR
LADDER
NETWORK
AND
CURRENT
SWITCHES
5
BIT 5
SUMMING JUNCTION
20V RANGE
5kꢀ
6
BIT 6
5kꢀ
7
BIT 7
10V RANGE
8
BIT 8
BIPOLAR OFFSET
REF INPUT
6.3kꢀ
9
BIT 9
–
+
10
11
12
BIT 10
BIT 11
(LSB) BIT 12
V
Low Cost Plastic Packaging
OUT
–V
S
ADDAC80
NC/+V *
L
*NC = CBIVERSIONS
5V – CCDVERSIONS
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.
1
2
24
23
22
21
20
19
18
17
16
15
14
13
(MSB) BIT 1
BIT 2
V
OUT
REF
REF
GAIN ADJUST
+V
CONTROL
CIRCUIT
3
BIT 3
S
4
BIT 4
COMMON
12-BIT
RESISTOR
LADDER
NETWORK
AND
CURRENT
SWITCHES
5
BIT 5
SCALING NETWORK
SCALING NETWORK
SCALING NETWORK
BIPOLAR OFFSET
REF INPUT
2kꢀ
6
BIT 6
5kꢀ
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.
7
BIT 7
5kꢀ
8
BIT 8
6.3kꢀ
9
BIT 9
10
11
12
BIT 10
BIT 11
(LSB) BIT 12
I
OUT
–V
S
NC/+V *
L
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.
*NC = CBIVERSIONS
5V – CCDVERSIONS
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.
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.
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 aremono-
tonic over the specified temperature range.
6. System performance upgrading is possible without redesign.
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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
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