AD679AJ Analog Devices Inc, AD679AJ Datasheet

AD679AJ

Manufacturer Part Number

AD679AJ

Description

A/D Converter (A-D) IC

Manufacturer

Analog Devices Inc

Datasheet

1.AD679JNZ.pdf (16 pages)

Specifications of AD679AJ

No. Of Bits

14 Bit

Mounting Type

Surface Mount

No. Of Channels

Interface Type

Parallel

Package / Case

44-PLCC

Rohs Status

RoHS non-compliant

Number Of Bits

Sampling Rate (per Second)

128k

Data Interface

Parallel

Number Of Converters

Power Dissipation (max)

745mw

Voltage Supply Source

Analog and Digital, Dual ±

Operating Temperature

-40°C ~ 85°C

Number Of Elements

Resolution

14Bit

Architecture

Flash

Sample Rate

128KSPS

Input Polarity

Unipolar/Bipolar

Input Type

Voltage

Rated Input Volt

10/±5V

Differential Input

Power Supply Requirement

Dual

Single Supply Voltage (typ)

Not RequiredV

Single Supply Voltage (min)

Not RequiredV

Single Supply Voltage (max)

Not RequiredV

Dual Supply Voltage (typ)

±12V

Dual Supply Voltage (min)

±11.4V

Dual Supply Voltage (max)

±12.6V

Power Dissipation

745mW

Integral Nonlinearity Error

±2LSB(Typ)

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Package Type

JLCC

Input Signal Type

Single-Ended

Lead Free Status / Rohs Status

Not Compliant

Available stocks

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Price

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Bonase Electronics (HK) Co., Limited

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AD679AJ

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INT

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BOSTOCK HK LIMITED

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Part Number:

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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 MΩ) 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.

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.

FEATURES

AC and DC Characterized and Specified

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 M

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

(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 layout,

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-

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

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.

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.

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

www.analog.com

Related parts for AD679AJ

AD679AJ 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 78 dB S/N+D ( Grades) Twos Complement Data Format (Bipolar Mode) Straight ...

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 (@ 25°C) 1 Bipolar Zero Error (@ 25° ...

Page 4

AD679 TIMING SPECIFICATIONS Parameter Symbol SC Delay t SC Conversion Time Conversion Rate t CR Convert Pulse Width t CP Aperture Delay t AD Status Delay Access Time Float Delay ...

Page 5

... Temperature Model AD679JN AD679KN AD679JD AD679KD AD679AD AD679BD AD679SD AD679TD AD679AJ AD679BJ 3 AD679SD/883B NOTES 1 For parallel read (14-bits) interface to 16-bit buses, see AD779 Plastic DIP Ceramic DIP J-Leaded Ceramic Chip Carrier. 3 For details, grade, and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or the current AD679/883B data sheet ...

Page 6

AD679 DIP Package EOCEN AIN 6 23 AD679 AGND 7 22 TOP VIEW (Not to Scale) REF 8 21 OUT REF BIPOFF ...

Page 7

DEFINITIONS OF SPECIFICATIONS Nyquist Frequency An implication of the Nyquist sampling theorem, the Nyquist frequency of a converter is the input frequency that is one-half the sampling frequency of the converter. Signal-to-Noise and Distortion (S/N+D) Ratio S/N+D is the ratio ...

Page 8

AD679 –Typical Performance Characteristics INPUT FREQUENCY (Hz) TPC 1. Harmonic Distortion vs. Input Frequency (–0.5 dB Input) INPUT FREQUENCY (Hz) TPC 2. Total Harmonic Distortion vs. Input Frequency and Amplitude INPUT FREQUENCY (Hz) TPC 3. S/(N+D) vs. Input Frequency and ...

Page 9

CONVERSION CONTROL In synchronous mode (SYNC = HIGH), both chip select (CS) and start convert (SC) must be brought LOW to start a conver- sion. CS should be LOW t before SC is brought LOW asynchronous mode (SYNC ...

Page 10

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

Page 11

Analog signals should be routed as far as possible from digital signals and should cross them at right angles. The AD679 incorporates several ...

Page 12

AD679 INTERFACING THE AD679 TO MICROPROCESSORS The I/O capabilities of the AD679 allow direct interfacing to general-purpose and DSP microprocessor buses. The asynchro- nous conversion control feature allows complete flexibility and control with minimal external hardware. The following examples illustrate ...

Page 13

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 supports the AD679 data memory interface with ...

Page 14

AD679 28-Lead Side-Brazed Ceramic Dual In-Line Package [SBDIP] 0.005 (0.13) MIN PIN 1 0.085 (2.16) MAX 0.200 (5.08) 0.125 (3.18) 0.005 (0.13) MIN PIN 1 0.085 (2.16) MAX 0.200 (5.08) 0.125 (3.18) OUTLINE DIMENSIONS (D-28) Dimensions shown in inches and ...

Page 15

Ceramic Leaded Chip Carrier, J-Formed Leads [JLCC] 0.078 (1.98) 0.054 (1.37) 0.025 (0.64) MIN 0.032 (0.81) 0.020 (0.51) 0.050 0.650 (16.51) (1.27) 0.610 (15.49) 0.023 (0.58) 0.013 (0.33) 0.135 (3.43) 0.100 (2.54) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS ...

Page 16

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