16-Bit, 30 MSPS
D/A Converter
a
AD768
FUNCTIO NAL BLO CK D IAGRAM
FEATURES
30 MSPS Update Rate
16-Bit Resolution
Linearity: 1/ 2 LSB DNL @ 14 Bits
1 LSB INL @ 14 Bits
Fast Settling: 25 ns Full-Scale Settling to 0.025%
SFDR @ 1 MHz Output: 86 dBc
THD @ 1 MHz Output: 71 dBc
Low Glitch Im pulse: 35 pV-s
Pow er Dissipation: 465 m W
On-Chip 2.5 V Reference
V
DD
DCOM
(MSB)
DB15
AD768
MSBs: SEGMENTED
CURRENT SOURCES
AND SWITCHES
MSB
DECODER
AND
EDGE-
TRIGGERED
BIT
LSBs:
IOUTA
IOUTB
CURRENT SOURCES,
SWITCHES, AND
1kΩ R-2R
1k
1k
LADDERS
LATCHES
LADCOM
Edge-Triggered Latches
Multiplying Reference Capability
2.5V
BANDGAP
REFERENCE
CONTROL
AMP
V
EE
DB0
APPLICATIONS
(LSB)
Arbitrary Waveform Generation
Com m unications Waveform Reconstruction
Vector Stroke Display
NR
CLOCK
IREFIN
NC REFCOM REFOUT
P RO D UCT D ESCRIP TIO N
P RO D UCT H IGH LIGH TS
T he AD768 is a 16-bit, high speed digital-to-analog converter
(DAC) that offers exceptional ac and dc performance. T he
AD768 is manufactured on ADI’s Advanced Bipolar CMOS
(ABCMOS) process, combining the speed of bipolar transistors,
the accuracy of laser-trimmable thin film resistors, and the effi-
ciency of CMOS logic. A segmented current source architecture
is combined with a proprietary switching technique to reduce
glitch energy and maximize dynamic accuracy. Edge triggered
input latches and a temperature compensated bandgap reference
have been integrated to provide a complete monolithic DAC
solution.
1. T he low glitch and fast settling time provide outstanding
dynamic performance for waveform reconstruction or digital
synthesis requirements, including communications.
2. T he excellent dc accuracy of the AD768 makes it suitable for
high speed A/D conversion applications.
3. On-chip, edge-triggered input CMOS latches interface
readily to CMOS logic families. T he AD768 can support up-
date rates up to 40 MSPS.
4. A temperature compensated, 2.5 V bandgap reference is
included on-chip allowing for generation of the reference
input current with the use of a single external resistor. An ex-
ternal reference may also be used.
T he AD768 is a current-output DAC with a nominal full-scale
output current of 20 mA and a 1 kΩ output impedance. Differ-
ential current outputs are provided to support single-ended
or differential applications. T he current outputs may be tied
directly to an output resistor to provide a voltage output, or fed
to the summing junction of a high speed amplifier to provide a
buffered voltage output. Also, the differential outputs may be
interfaced to a transformer or differential amplifier.
5. T he current output(s) of the AD768 may be used singly or
differentially, either into a load resistor, external op amp
summing junction or transformer.
6. Proper selection of an external resistor and compensation
capacitor allow the performance-conscious user to optimize
the AD768 reference level and bandwidth for the target
application.
T he on-chip reference and control amplifier are configured for
maximum accuracy and flexibility. T he AD768 can be driven by
the on-chip reference or by a variety of external reference volt-
ages based on the selection of an external resistor. An external
capacitor allows the user to optimally trade off reference band-
width and noise performance.
T he AD768 operates on ±5 V supplies, typically consuming
465 mW of power. T he AD768 is available in a 28-pin SOIC
package and is specified for operation over the industrial tem-
perature range.
REV. B
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703
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