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Analog Devices Semiconductor Electronic Components Datasheet

AD679 Datasheet

14-Bit 128 kSPS Complete Sampling ADC

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AD679 pdf
a
FEATURES
AC and DC Characterized and Specified
(K, B, T Grades)
128k Conversions per Second
1 MHz Full Power Bandwidth
500 kHz Full Linear Bandwidth
78 dB S/N+D (K, B, T Grades)
Twos Complement Data Format (Bipolar Mode)
Straight Binary Data Format (Unipolar Mode)
10 MInput Impedance
8-Bit Bus Interface
On-Board Reference and Clock
10 V Unipolar or Bipolar Input Range
Pin Compatible with AD678 12-Bit, 200 kSPS ADC
MIL-STD-883 Compliant Versions Available
14-Bit 128 kSPS
Complete Sampling ADC
AD679
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD679 is a complete, multipurpose 14-bit monolithic
analog-to-digital converter, consisting of a sample-and-hold am-
plifier (SHA), a microprocessor-compatible bus interface, a volt-
age reference, and clock generation circuitry.
The AD679 is specified for ac (or dynamic) parameters such as
S/N+D ratio, THD, and IMD, which are important in signal
processing applications. In addition, the AD679K, B, and T
grades are fully specified for dc parameters that are important in
measurement applications.
The 14 data bits are accessed in two read operations (8 + 6),
with left justification. Data format is straight binary for unipolar
mode and twos complement binary for bipolar mode. The 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 M) allows direct connection to unbuffered
sources without signal degradation. Conversions can be initiated
either under microprocessor control or by an external clock
asynchronous to the system clock.
This 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. The converter utilizes a recursive subranging
algorithm that includes error correction and flash converter
circuitry to achieve high speed and resolution.
The AD679 operates from +5 V and ±12 V supplies and dissipates
560 mW (typ). The part is available in 28-lead plastic DIP,
ceramic DIP, and 44 J-leaded ceramic surface-mount packages.
PRODUCT HIGHLIGHTS
1. COMPLETE INTEGRATION: The AD679 minimizes
external component requirements by combining a high
speed sample-and-hold amplifier (SHA), ADC, 5 V refer-
ence, clock, and digital interface on a single chip. This
provides a fully specified sampling A/D function unattain-
able with discrete designs.
2. SPECIFICATIONS: The AD679K, B, and T grades provide
fully specified and tested ac and dc parameters. The AD679J,
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, THD, and IMD) are of value in signal process-
ing applications.
3. EASE OF USE: The pinout is designed for easy board layout,
and the two-read output provides compatibility with 8-bit
buses. Factory trimming eliminates the need for calibration
modes or external trimming to achieve rated performance.
4. RELIABILITY: The AD679 utilizes Analog Devices’ mono-
lithic BiMOS technology. This ensures long-term reliability
compared to multichip and hybrid designs.
5. UPGRADE PATH: The AD679 provides the same pinout as
the 12-bit, 200 kSPS AD678 ADC.
6. The AD679 is available in versions compliant with MIL-
STD-883. Refer to the Analog Devices Military Products
Databook or current AD679/883B 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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD679 Datasheet

14-Bit 128 kSPS Complete Sampling ADC

No Preview Available !

AD679 pdf
AD679–SPECIFICATIONS
AC SPECIFICATIONS (TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%, fSAMPLE = 128 kSPS, fIN = 10.009 kHz,
unless otherwise noted)1
Parameter
AD679J/A/S
AD679K/B/T
Min Typ Max Min Typ Max Unit
SIGNAL-TO-NOISE AND DISTORTION (S/N+D) RATIO2
–0.5 dB Input (Referred to –0 dB Input)
–20 dB Input (Referred to –20 dB Input)
–60 dB Input (Referred to –60 dB Input)
76
58
18
79
59
19
78 81
60 61
20 21
dB
dB
dB
TOTAL HARMONIC DISTORTION (THD)3
@ 25°C
TMIN to TMAX
–90
0.003
–88
0.004
–82
0.006
–82
0.008
–90
0.003
–88
0.004
–82
0.006
–82
0.008
dB
%
dB
%
PEAK SPURIOUS OR PEAK HARMONIC COMPONENT
–90 –82
–90 –82 dB
FULL POWER BANDWIDTH
1 1 MHz
FULL LINEAR BANDWIDTH
500 500 kHz
INTERMODULATION DISTORTION (IMD)4
2nd Order Products
3rd Order Products
–90 –82
–90 –82
–90 –82 dB
–90 –82 dB
NOTES
1flN amplitude = –0.5 dB (9.44 V p-p) bipolar mode full scale unless otherwise indicated. All measurements referred to a –0 dB (9.997 V p-p) input signal
unless otherwise noted.
2See TPC 3 for higher frequencies and other input amplitudes.
3See TPCs 1 and 2 for higher frequencies and other input amplitudes.
4fA = 9.08 kHz, fB = 9.58 kHz, with fSAMPLE 100 kSPS. See Definition of Specifications section.
Specifications subject to change without notice.
DIGITAL SPECIFICATIONS (All device types TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%)
Parameter
Test Conditions
Min Max
Unit
LOGIC INPUTS
VIH High Level Input Voltage
VIL Low Level Input Voltage
IIH High Level Input Current
IIL Low Level Input Current
CIN Input Capacitance
VIN = 5 V
VIN = 0 V
2.0 VDD
0 0.8
–10 +10
–10 +10
10
V
V
µA
µA
pF
LOGIC OUTPUTS
VOH High Level Output Voltage
VOL Low Level Output Voltage
IOZ High Z Leakage Current
COZ High Z Output Capacitance
IOH = 0.1 mA
IOH = 0.5 mA
IOL = 1.6 mA
VIN = 0 or 5 V
4.0
2.4
0.4
–10 +10
10
V
V
V
µA
pF
NOTES
1flN amplitude = –0.5 dB (9.44 V p-p) bipolar mode full scale unless otherwise indicated. All measurements referred to a –0 dB (9.997 V p-p) input signal
unless otherwise noted.
2See TPC 3 for higher frequencies and other input amplitudes.
3See TPCs 1 and 2 for higher frequencies and other input amplitudes.
4fA = 9.08 kHz, fB = 9.58 kHz, with fSAMPLE 100 kSPS. See Definition of Specifications section.
Specifications subject to change without notice.
–2– REV. D


Part Number AD679
Description 14-Bit 128 kSPS Complete Sampling ADC
Maker Analog Devices
Total Page 16 Pages
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