AD779KD Analog Devices Inc, AD779KD Datasheet

IC, ADC, 14BIT, 128KSPS, DIP-28

AD779KD

Manufacturer Part Number
AD779KD
Description
IC, ADC, 14BIT, 128KSPS, DIP-28
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD779KD

Resolution (bits)
14bit
Sampling Rate
128kSPS
Input Channel Type
Single Ended
Data Interface
Parallel
Supply Current
25mA
Digital Ic Case Style
DIP
No. Of Pins
28
Rohs Status
RoHS non-compliant
Number Of Bits
14
Sampling Rate (per Second)
128k
Number Of Converters
1
Power Dissipation (max)
745mw
Voltage Supply Source
Dual ±
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
28-CDIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD779KD
Manufacturer:
ADI
Quantity:
471
a
PRODUCT DESCRIPTION
The 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.
The AD779 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 AD779K, B and T
grades are fully specified for dc parameters which are important
in measurement applications.
The 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. 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.
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 which includes error correction and flash converter
circuitry to achieve high speed and resolution.
The AD779 operates from +5 V and 12 V supplies and
dissipates 560 mW (typ). Twenty-eight-pin plastic DIP and
ceramic DIP packages are available.
*Protected by U.S. Patent Numbers 4,804,960; 4,814,767; 4,833,345;
REV. B
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.
4,250,445; 4,808,908; RE30,586.
FEATURES
AC and DC Characterized and Specified (K, B, T
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
16-Bit Bus Interface (See AD679 for 8-Bit Interface)
Onboard Reference and Clock
10 V Unipolar or Bipolar Input Range
MIL-STD-883 Compliant Versions Available
Grades)
Input Impedance
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
PRODUCT HIGHLIGHTS
l. COMPLETE INTEGRATION: The AD779 minimizes
2. SPECIFICATIONS: The AD779K, B and T grades provide
3. EASE OF USE: The pinout is designed for easy board lay-
4. RELIABILITY: The AD779 utilizes Analog Devices’
5. The AD779 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 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, THD and IMD) are of value in signal process-
ing applications.
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.
monolithic BiMOS technology. This ensures long term
reliability compared to multichip and hybrid designs.
STD-883. Refer to the Analog Devices Military Products
Databook or current AD779/883B data sheet for detailed
specifications.
FUNCTIONAL BLOCK DIAGRAM
Complete Sampling ADC
14-Bit 128 kSPS
AD779*
Fax: 617/326-8703

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AD779KD Summary of contents

Page 1

FEATURES AC and DC Characterized and Specified ( Grades) 128k Conversions per Second 1 MHz Full Power Bandwidth 500 kHz Full Linear Bandwidth 80 dB S/N+D ( Grades) Twos Complement Data Format (Bipolar Mode) Straight ...

Page 2

AD779–SPECIFICATIONS ( SPECIFICATIONS MIN f = 10.009 kHz unless otherwise noted) lN Parameter SIGNAL-TO-NOISE AND DISTORTION (S/N+D) RATIO –0.5 dB Input (Referred Input) –20 dB Input (Referred to –20 dB Input) –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

AD779 TIMING SPECIFICATIONS (All device types +12 V MIN MAX CC 5 10%) DD Parameter Symbol Min 1 Conversion Rate t CR Convert Pulse Width t 0.097 CP Aperture Delay ...

Page 5

... For further information on ESD precautions, refer to Analog Devices’ ESD Prevention Manual. 2 Model Temperature Range AD779JN +70 C AD779KN +70 C AD779JD +70 C AD779KD +70 C AD779AD – +85 C AD779BD – +85 C AD779SD – +125 C AD779TD – +125 C NOTES 1 For two cycle read (8+16 bits) interface to 8-bit buses, see AD679 ...

Page 6

AD779 28-Pin DIP Symbol Pin No. AGND 7 AIN 6 BIPOFF DGND 14 DB13–DB0 28–15 EOC 2 EOCEN REF 9 IN REF 8 OUT ...

Page 7

DEFINITION OF SPECIFICATIONS 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 ...

Page 8

AD779 CONVERSION TRUTH TABLE INPUTS Mode SC EOCEN CS Start Conversion Conversion Status Data Access NOTES 1 = HIGH voltage level. 0 ...

Page 9

BIPOLAR RANGE INPUTS The connections for the bipolar mode are shown in Figure 5. In this mode, data output coding will be twos complement binary. This circuit will allow approximately offset trim range ( 40 LSB) and ...

Page 10

AD779 An effort should be made to minimize the trace length between the capacitor leads and the respective converter power supply and common pins. The circuit layout should attempt to locate the AD779, associated analog input circuitry and interconnec- tions ...

Page 11

AD779 TO 80186 Figure 10 shows the AD779 interfaced to the 80186 micropro- cessor. This interface allows the 80186’s built-in DMA control- ler to transfer the AD779 output into a RAM based FIFO buffer of any length, with no microprocessor ...

Page 12

AD779 Figure 15. S/(N+D) vs. Input Frequency and Amplitude Figure 17. Nonaveraged IMD Plot for f 9.58 kHz ( 128 kSPS b 28-Lead Plastic DIP Package (N-28) Figure 16. 5-Plot Averaged 2048-Point FFT at 128 kSPS ...

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