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 (565A) Supplies,
with –12 V Supply (AD566A)
Linearity Guaranteed Overtemperature
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 Overtemperature
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, a 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 grades are specified for use over the 0°C to
+70°C temperature range while the S and T grades are speci-
fied for the –55°C to +125°C range. The D grades are all pack-
aged 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 continuing
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 for 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 voltage
output configurations without an output amplifier.
2. The devices incorporate a newly developed, fully differential,
nonsaturating precision current switching cell structure that
combines the dc accuracy and stability first developed in the
AD562/AD563 with very fast switching times and an optimally
damped settling characteristic.
3. The devices also contain SiCr thin-film application resistors
that can be used with an external op amp to provide a preci-
sion 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 temperature
coefficient and are laser-trimmed for minimum full-scale and
bipolar offset errors.
The laser trimming process that provides the excellent linearity
is also used to trim both the absolute value and the temperature
coefficient of the reference of the AD565A, resulting in a typical
full-scale gain TC of 10 ppm/°C. When tighter TC performance
is required or when a system reference is available, the AD566A
may be used with an external reference.
*Covered by Patent Numbers: 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 compliant
with MIL-STD-883. Refer to the Analog Devices Military
Products Databook or current /883B data sheet for detailed
specifications.
REV. E
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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