High Speed 12-Bit
Monolithic D/A Converters
a
AD565A*/AD566A*
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
Single Chip Construction
V
REF OUT
CC
BIPOLAR OFF
Very High-Speed Settling to 1/2 LSB
AD565A: 250 ns max
AD566A: 350 ns max
Full-Scale Switching Time: 30 ns
Guaranteed for Operation with ؎12 V Supplies:
AD565A with –12 V Supply: AD566A
Linearity Guaranteed Over Temperature:
1/2 LSB max (K, T Grades)
20V SPAN
10V
AD565A
5k⍀
9.95k⍀
10V SPAN
DAC OUT
19.95k⍀
0.5mA
REF
IN
5k⍀
I
REF
DAC
I
=
20k⍀
OUT
I
REF
GND
8k⍀
O
REF
CODE INPUT
Monotonicity Guaranteed Over Temperature
Low Power: AD566A = 180 mW max;
AD565A = 225 mW max
–V
EE
POWER
GND
MSB
LSB
BIPOLAR OFF
Use with On-Board High-Stability Reference (AD565A)
or with External Reference (AD566A)
Low Cost
20V SPAN
AD566A
5k⍀
9.95k⍀
10V SPAN
DAC OUT
19.95k⍀
0.5mA
MlL-STD-883-Compliant Versions Available
REF
IN
5k⍀
I
REF
DAC
PRODUCT DESCRIPTION
I
=
20k⍀
OUT
I
REF
GND
8k⍀
O
The AD565A and AD566A are fast 12-bit digital-to-analog
converters that incorporate the latest advances in analog circuit
design to achieve high speeds at low cost.
REF
CODE INPUT
The AD565A and AD566A use 12 precision, high-speed bipolar
current-steering switches, control amplifier and a laser-trimmed
thin-film resistor network to produce a very fast, high accuracy
analog output current. The AD565A also includes a buried
Zener reference that features low-noise, long-term stability and
temperature drift characteristics comparable to the best discrete
reference diodes.
–V
EE
POWER
GND
LSB
MSB
AD565A and AD566A are available in four performance
grades. The J and K are specified for use over the 0°C to +70°C
temperature range while the S and T grades are specified for the
–55°C to +125°C range. The D grades are all packaged in a
24-lead, hermetically sealed, ceramic, dual-in-line package. The
JR grade is packaged in a 28-lead plastic SOIC.
The combination of performance and flexibility in the AD565A
and AD566A has resulted from major innovations in circuit
design, an important new high-speed bipolar process, and con-
tinuing advances in laser-wafer-trimming techniques (LWT).
The AD565A and AD566A have a 10–90% full-scale transition
time less than 35 ns and settle to within 1/2 LSB in 250 ns
max (350 ns for AD566A). Both are laser-trimmed at the wafer
level to 1/8 LSB typical linearity and are specified to 1/4 LSB
max error (K and T grades) at +25°C. High speed and accuracy
make the AD565A and AD566A the ideal choice for high-speed
display drivers as well as fast analog-to-digital converters.
PRODUCT HIGHLIGHTS
1. The wide output compliance range of the AD565A and
AD566A are ideally suited for fast, low noise, accurate volt-
age output configurations without an output amplifier.
2. The devices incorporate a newly developed, fully differential,
nonsaturating precision current switching cell structure
which combines the dc accuracy and stability first developed
in the AD562/3 with very fast switching times and an
optimally-damped settling characteristic.
3. The devices also contain SiCr thin film application resistors
which can be used with an external op amp to provide a
precision voltage output or as input resistors for a successive
approximation A/D converter. The resistors are matched to
the internal ladder network to guarantee a low gain tempera-
ture coefficient and are laser-trimmed for minimum
full-scale and bipolar offset errors.
The laser trimming process which provides the excellent linear-
ity is also used to trim both the absolute value and the tempera-
ture coefficient of the reference of the AD565A resulting in a
typical full-scale gain TC of 10 ppm/°C. When tighter TC per-
formance is required or when a system reference is available, the
AD566A may be used with an external reference.
*Covered by Patent Nos.: 3,803,590; RE 28,633; 4,213,806; 4,136,349;
4,020,486; 3,747,088.
4. The AD565A and AD566A are available in versions compli-
ant with MIL-STD-883. Refer to the Analog Devices Mili-
tary Products Databook or current /883B data sheet for
detailed specifications.
REV. D
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 2000
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