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AD538SD883B

更新时间： 2024-11-23 12:36:11
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亚德诺 - ADI /
页数 文件大小 规格书
17页 511K
描述
Real-Time Analog Computational Unit (ACU)

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AD538SD883B 数据手册

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Real-Time Analog  
Computational Unit (ACU)  
AD538  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
VO = VY(VZ/VX)m transfer function  
I
D
X
X
25kΩ  
Wide dynamic range (denominator) −1000:1  
Simultaneous multiplication and division  
Resistor-programmable powers and roots  
No external trims required  
Low input offsets <100 μV  
Low error 0.2ꢀ5 of reading (100:1 range)  
Monolithic construction  
100Ω  
V
LOG  
B
A
RATIO  
25kΩ  
V
I
Z
Z
100Ω  
INTERNAL  
VOLTAGE  
REFERENCE  
+10V  
+2V  
Real-time analog multiplication, division and  
exponentiation  
V
I
Y
Y
High accuracy analog division with a wide input dynamic range  
On board +2 V or +10 V scaling reference  
Voltage and current (summing) input modes  
Monolithic construction with lower cost and higher  
reliability than hybrid and modular circuits  
25kΩ  
AD538  
LOG  
C
I
ANTILOG  
OUTPUT  
V
O
APPLICATIONS  
One- or two-quadrant multiply/divide  
Log ratio computation  
Figure 1.  
Squaring/square rooting  
Trigonometric function approximations  
Linearization via curve fitting  
Precision AGC  
Power functions  
GENERAL DESCRIPTION  
The AD538 is a monolithic real-time computational circuit  
that provides precision analog multiplication, division, and  
exponentiation. The combination of low input and output offset  
voltages and excellent linearity results in accurate computation  
over an unusually wide input dynamic range. Laser wafer  
trimming makes multiplication and division with errors as low  
as 0.25% of reading possible, while typical output offsets of  
100 μV or less add to the overall off-the-shelf performance level.  
Real-time analog signal processing is further enhanced by the  
400 kHz bandwidth of the device.  
multiplication and division can be set using the on-chip +2 V or  
+10 V references, or controlled externally to provide simultaneous  
multiplication and division. Exponentiation with an m value  
from 0.2 to 5 can be implemented with the addition of one or  
two external resistors.  
Direct log ratio computation is possible by using only the log  
ratio and output sections of the chip. Access to the multiple  
summing junctions adds further to the flexibility of the AD538.  
Finally, a wide power supply range of 4.5 V to 18 V allows  
operation from standard 5 V, 12 V and 15 V supplies.  
The overall transfer function of the AD538 is VO = VY(VZ/VX)m.  
Programming a particular function is via pin strapping. No  
external components are required for one-quadrant (positive  
input) multiplication and division. Two-quadrant (bipolar  
numerator) division is possible with the use of external level  
shifting and scaling resistors. The desired scale factor for both  
The AD538 is available in two accuracy grades (A and B) over  
the industrial (−25°C to +85°C) temperature range and one  
grade (S) over the military (−55°C to +125°C) temperature  
range. The device is packaged in an 18-lead TO-118 hermetic  
side-brazed ceramic DIP. A-grade chips are also available.  
Rev. E  
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. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2011 Analog Devices, Inc. All rights reserved.  
 
 
 
 
 
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