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AD679BJ

更新时间: 2024-02-14 06:31:16
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亚德诺 - ADI 转换器信息通信管理
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12页 362K
描述
14-Bit 128 kSPS Complete Sampling ADC

AD679BJ 数据手册

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14-Bit 128 kSPS  
Complete Sampling ADC  
a
AD679*  
FUNCTIONAL BLOCK DIAGRAM  
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  
80 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 (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  
GENERAL DESCRIPTION  
PRODUCT HIGHLIGHTS  
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.  
1. COMPLETE INTEGRATION: The AD679 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. This provides a  
fully specified sampling A/D function unattainable with  
discrete designs.  
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.  
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.  
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.  
3. EASE OF USE: The pinout is designed for easy board lay-  
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.  
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.  
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.  
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;  
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.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  

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