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AD53020 PDF预览

AD53020

更新时间: 2024-11-18 22:38:59
品牌 Logo 应用领域
亚德诺 - ADI 延迟线逻辑集成电路
页数 文件大小 规格书
4页 74K
描述
Four Channel ECL Delay Line

AD53020 数据手册

 浏览型号AD53020的Datasheet PDF文件第2页浏览型号AD53020的Datasheet PDF文件第3页浏览型号AD53020的Datasheet PDF文件第4页 
a
Four Channel ECL Delay Line  
AD53020  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Four Delay Lines with the Ability to Independently  
Adjust All Edges  
GND  
S0  
S1  
Pin Compatible and Functionally Equivalent with the  
BT624  
Reduced Power Dissipation  
VWIDTH1  
OUT1  
AD53020  
IN1, IN1  
44-Lead PLCC Package with Internal Heat Spreader  
OUT1  
APPLICATIONS  
VDELAY1  
VWIDTH2  
Automatic Test Equipment  
Semiconductor Test Systems  
Board Test Systems  
OUT2  
IN2, IN2  
Clocked ECL Circuits  
OUT2  
DRVMODE  
VDELAY2  
VWIDTH3  
OUT3  
IN3, IN3  
OUT3  
PRODUCT DESCRIPTION  
VDELAY3  
VWIDTH4  
The AD53020 is a four-channel delay line designed for use in  
automatic test equipment and digital logic systems. High speed  
bipolar transistors and a 44-lead plastic PLCC package with  
internal heat spreader provide high frequency performance at a  
minimum of space, cost and power dissipation.  
OUT4  
IN4, IN4  
OUT4  
VDELAY4  
V
EE  
Featuring full pin compatibility and functional equivalence to  
the BT624, the AD53020 offers independent analog control of  
positive and negative edges with five delay ranges. The AD53020  
offers attractive performance with optimized power dissipation  
and linear delay vs. program voltage control. This device is also  
very stable over operating conditions and has very low jitter.  
V
COMP1  
COMP2  
REXT1  
REXT2  
BB  
Digital inputs are ECL compatible. They can either be pro-  
vided independently for each channel (IN1, IN1 through IN4,  
IN4), or fanned out to all channels from Channel 2 (IN2,  
IN2). The choice of these two options is made by setting the  
DRVMODE input, with ECL Logic 0 providing four indepen-  
dent channels, and ECL Logic 1 enabling a logical OR function  
between each channel and the Channel Number 2.  
The delay is programmed through the VDELAY and VWIDTH  
pins for each channel. The acceptable range is –1.3 V to –0.1 V,  
representing the longest and the shortest delays provided by the  
device. An 0.01 µF ceramic capacitor to ground is recom-  
mended for each input. The bias current for each input is fixed  
by an internal current mirror. The value of the bias current is  
set by the external resistor at REXT1. A 1.3 kresistor to  
ground at this pin establishes 1 mA bias in each input. The  
nominal voltage at the REXT1 pin is –1.3 V.  
For maximum timing accuracy, differential signals are recom-  
mended for use with the digital inputs. However, single-ended  
operation is also supported and it is facilitated through the use  
of the VBB midpoint level generated on-chip. To make use of  
this feature, connect the VBB output to the inverting input of  
each channel. It is also advisable, when using the VBB output,  
to decouple this signal with a 0.1 µF ceramic capacitor to ground.  
The VDELAY affects both the positive and negative edges in all  
modes. The VWIDTH is an additional delay adjustment that is  
active in Modes 2, 3 and 5. VWIDTH has no effect in Modes 0  
and 1. For Modes 2 and 3, the effect of the VWIDTH adjust-  
ment is to increase or decrease the delay of the negative edge  
relative to the positive edge. In Mode 5, the total delay for both  
positive and negative edges is set by the combination of VDELAY  
and VWIDTH.  
The outputs of the AD53020 are ECL compatible and should  
be terminated by 50 to –2.0 V at the inputs of the gates  
they drive.  
(continued on page 4)  
REV. A  
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: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  

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