DFA200AA80 Analog Devices, DFA200AA80 Datasheet

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DFA200AA80

Manufacturer Part Number
DFA200AA80
Description
THREE PHASE DIODE + THYRISTOR
Manufacturer
Analog Devices
Datasheet

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GENERAL DESCRIPTION
The AD679 is a complete, multipurpose 14-bit monolithic
analog-to-digital converter, consisting of a sample-hold ampli-
fier (SHA), a microprocessor compatible bus interface, a voltage
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 which 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 im-
pedance (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 al-
gorithm which includes error correction and flash converter cir-
cuitry to achieve high speed and resolution.
The AD679 operates from +5 V and 12 V supplies and dissi-
pates 560 mW (typ). 28-pin plastic DIP, ceramic DIP and 44
J-leaded ceramic surface mount packages are available.
*Protected by U.S. Patent Nos. 4,804,960; 4,814,767; 4,833,345; 4,250,445;
REV. C
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.
4,808,908; RE 30,586
FEATURES
AC and DC Characterized and Specified
128k Conversions per Second
1 MHz Full Power Bandwidth
500 kHz Full Linear Bandwidth
80 dB S/N+D (K, B, T Grades)
Twos Complement Data Format (Bipolar Mode)
Straight Binary Data Format (Unipolar Mode)
10 M
8-Bit Bus Interface (See AD779 for 16-Bit 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
(K, B, T Grades)
Input Impedance
PRODUCT HIGHLIGHTS
1. COMPLETE INTEGRATION: The AD679 minimizes
2. SPECIFICATIONS: The AD679K, B and T grades provide
3. EASE OF USE: The pinout is designed for easy board lay-
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
4. RELIABILITY: The AD679 utilizes Analog Devices’ mono-
5. UPGRADE PATH: The AD679 provides the same pinout as
6. The AD679 is available in versions compliant with MIL-
external component requirements by combining a high
speed sample-hold amplifier (SHA), ADC, 5 V reference,
clock and digital interface on a single chip. This provides a
fully specified sampling A/D function unattainable with
discrete designs.
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.
out, 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.
lithic BiMOS technology. This ensures long term reliability
compared to multichip and hybrid designs.
the 12-bit, 200 kSPS AD678 ADC.
STD-883. Refer to the Analog Devices Military Products
Databook or current AD679/883B data sheet for detailed
specifications.
FUNCTIONAL BLOCK DIAGRAM
Complete Sampling ADC
14-Bit 128 kSPS
AD679*
Fax: 617/326-8703

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DFA200AA80 Summary of contents

Page 1

... U.S. Patent Nos. 4,804,960; 4,814,767; 4,833,345; 4,250,445; 4,808,908; RE 30,586 REV. C 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 ...

Page 2

AD679–SPECIFICATIONS ( MIN AC SPECIFICATIONS unless otherwise noted) Parameter SIGNAL-TO-NOISE AND DISTORTION (S/N+D) RATIO –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) ...

Page 3

DC SPECIFICATIONS ( MIN Parameter TEMPERATURE RANGE J, K Grades A, B Grades S, T Grades ACCURACY Resolution Integral Nonlinearity (INL) Differential Nonlinearity (DNL) 1 Unipolar Zero Error (@ + Bipolar Zero Error (@ +25 C) ...

Page 4

... For parallel read (14-bits) interface to 16-bit buses, see AD779. 2 For details grade and package offerings screened in accordance with MIL-STD- 883, refer to the Analog Devices Miliary Products Databook or current AD679/ 883B data sheet Plastic DIP Ceramic DIP J-Leaded Ceramic Chip Carrier. ...

Page 5

... Unused devices must be stored in conductive foam or shunts, and the foam should be discharged to the destination socket before devices are removed. For further information on ESD precautions, refer to Analog Devices’ ESD Prevention Manual. 28-Pin Ceramic DIP Package (D-28) 28-Lead Plastic DIP Package (N-28) REV ...

Page 6

AD679 28-Pin 44-Lead DIP JLCC Symbol Pin No. Pin No. AGND 7 11 AIN 6 10 BIPOFF DGND 12 DB7–DB0 26–19 40, 39, 37, 36, 35, 34, 33, 31 EOC 27 42 EOCEN ...

Page 7

NYQUIST FREQUENCY An implication of the Nyquist sampling theorem, the “Nyquist Frequency” converter is that input frequency which is one- half the sampling frequency of the converter. SIGNAL-TO-NOISE AND DISTORTION (S/N+D) RATIO S/N+D is the ratio of the ...

Page 8

AD679 CONVERSION CONTROL In synchronous mode (SYNC = HIGH), both Chip Select (CS) and Start Convert (SC) must be brought LOW to start a con- version. CS should be LOW t before SC is brought LOW asynchronous mode ...

Page 9

INPUT CONNECTIONS AND CALIBRATION The high ( input impedance of the AD679 eases the task of interfacing to high source impedances or multiplexer channel-to-channel mismatches 300 . The 10 V p-p full-scale input range accepts ...

Page 10

AD679 and digital ground planes are also desirable, with a single inter- connection point to minimize ground loops. Analog signals should be routed as far as possible from digital signals and should cross them at right angles. The AD679 incorporates ...

Page 11

... This read operation executes in a similar manner to the first and is completed during the next 160 ns. Figure 11. AD679 to ADSP-2101 Interface AD679 to Analog Devices ADSP-2100A Figure 12 demonstrates the AD679 interfaced to an ADSP-2100A. With a clock frequency of 12.5 MHz, and instruction execution in one 80 ns cycle, the digital signal processor will support the AD679 data memory interface with three hardware wait states ...

Page 12

AD679 Figure 13. Harmonic Distortion vs. Input Frequency (–0.5 dB Input) Figure 14. Total Harmonic Distortion vs. Input Frequency and Amplitude Figure 15. S/(N+D) vs. Input Frequency and Amplitude Figure 16. 5-Plot Averaged 2048 Point FFT at 128 kSPS, f ...

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