14-Bit 128 kSPS
Complete Sampling ADC
a
AD779*
FEATURES
FUNCTIO NAL BLO CK D IAGRAM
AC and DC Characterized and Specified (K, B, T
Grades)
128k Conversions per Second
1 MHz Full Pow er Bandw idth
500 kHz Full Linear Bandw idth
80 dB S/ N+D (K, B, T Grades)
Tw os Com plem ent Data Form at (Bipolar Mode)
Straight Binary Data Form at (Unipolar Mode)
10 M⍀ Input Im pedance
16-Bit Bus Interface (See AD679 for 8-Bit Interface)
Onboard Reference and Clock
10 V Unipolar or Bipolar Input Range
MIL-STD-883 Com pliant Versions Available
P RO D UCT D ESCRIP TIO N
P RO D UCT H IGH LIGH TS
T he AD779 is a complete, multipurpose 14-bit monolithic
analog-to-digital converter, consisting of a sample-hold amplifier
(SHA), a microprocessor compatible bus interface, a voltage
reference and clock generation circuitry.
l. COMPLET E INT EGRAT ION: T he AD779 minimizes
external component requirements by combining a high speed
sample-hold amplifier (SHA), ADC, 5 V reference, clock
and digital interface on a single chip. T his provides a fully
specified sampling A/D function unattainable with discrete
designs.
T he AD779 is specified for ac (or “dynamic”) parameters such
as S/N+D ratio, T HD and IMD which are important in signal
processing applications. In addition, the AD779K, B and T
grades are fully specified for dc parameters which are important
in measurement applications.
2. SPECIFICAT IONS: T he AD779K, B and T grades provide
fully specified and tested ac and dc parameters. T he AD779J,
A and S grades are specified and tested for ac parameters; dc
accuracy specifications are shown as typicals. DC specifica-
tions (such as INL, gain and offset) are important in control
and measurement applications. AC specifications (such as
S/N+D ratio, T HD and IMD) are of value in signal process-
ing applications.
T he 14 data bits are accessed by a 16-bit bus in a single read
operation. Data format is straight binary for unipolar mode and
twos complement binary for bipolar mode. T he input has a full-
scale range of 10 V with a full power bandwidth of 1 MHz and a
full linear bandwidth of 500 kHz. High input impedance (10 MΩ)
allows direct connection to unbuffered sources without signal
degradation.
3. EASE OF USE: T he pinout is designed for easy board lay-
out, and the single cycle read output provides compatibility
with 16-bit buses. Factory trimming eliminates the need for
calibration modes or external trimming to achieve rated
performance.
T his product is fabricated on Analog Devices’ BiMOS process,
combining low power CMOS logic with high precision, low
noise bipolar circuits; laser-trimmed thin-film resistors provide
high accuracy. T he converter utilizes a recursive subranging
algorithm which includes error correction and flash converter
circuitry to achieve high speed and resolution.
4. RELIABILIT Y: T he AD779 utilizes Analog Devices’
monolithic BiMOS technology. T his ensures long term
reliability compared to multichip and hybrid designs.
T he AD779 operates from +5 V and ±12 V supplies and
dissipates 560 mW (typ). T wenty-eight-pin plastic DIP and
ceramic DIP packages are available.
5. T he AD779 is available in versions compliant with MIL-
ST D-883. Refer to the Analog Devices Military Products
Databook or current AD779/883B data sheet for detailed
specifications.
*P r otected by U.S. P atent Num ber s 4,804,960; 4,814,767; 4,833,345;
4,250,445; 4,808,908; RE 30,586.
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.
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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