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AD7776JR

更新时间： 2024-11-11 19:50:27
品牌 Logo 应用领域
亚德诺 - ADI 光电二极管转换器
页数 文件大小 规格书
12页 172K
描述
IC 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28, SOIC-24, Analog to Digital Converter

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AD7776JR 数据手册

 浏览型号AD7776JR的Datasheet PDF文件第2页浏览型号AD7776JR的Datasheet PDF文件第3页浏览型号AD7776JR的Datasheet PDF文件第4页浏览型号AD7776JR的Datasheet PDF文件第5页浏览型号AD7776JR的Datasheet PDF文件第6页浏览型号AD7776JR的Datasheet PDF文件第7页 
2
LC MOS, High Speed  
1-, 4- & 8-Channel 10-Bit ADCs  
a
AD7776/AD7777/AD7778*  
FEATURES  
FUNCTIO NAL BLO CK D IAGRAMS  
AD7776: Single Channel  
AD7777: 4-Channel  
AD7778: 8-Channel  
Fast 10-Bit ADC: 2.5 ␮s Worst Case  
+5 V Only  
V
CC  
CLKIN  
CONTROL  
REGISTER  
10  
Half-Scale Conversion Option  
Fast Interface Port  
Pow er-Dow n Mode  
ADCREG1  
DB0–DB9  
10-BIT  
ADC  
A
IN  
1
MUX  
T/H  
10  
C
REFIN  
V
BIAS  
APPLICATIONS  
HDD Servos  
Instrum entation  
REFIN  
REFIN  
RTN  
REF  
REFOUT  
V
SWING  
CONTROL LOGIC  
GENERAL D ESCRIP TIO N  
AD7776  
AGND  
T he AD7776, AD7777 and AD7778 are a family of high speed,  
multichannel, 10-bit ADCs primarily intended for use in R/W  
head positioning servos found in high density hard disk drives.  
T hey have unique input signal conditioning features that make  
them ideal for use in such single supply applications.  
DGND  
AGND  
CS RD WR  
BUSY/INT  
V
CC  
CLKIN  
A
IN  
A
IN  
A
IN  
A
IN  
1
2
3
4
CONTROL  
REGISTER  
By setting a bit in a control register within both the four-channel  
version, AD7777, and the eight-channel version, AD7778, the  
input channels can either be independently sampled or any two  
channels of choice can be simultaneously sampled. For all ver-  
MUX  
10  
T/H  
1
ADCREG2  
ADCREG1  
1
DB0–DB9  
10-BIT  
ADC  
10  
C
REFIN  
sions the specified input signal range is of the form VBIAS  
±
VSWING. H owever, if the RT N pin is biased at, say, 2 V the  
V
BIAS  
analog input signal range becomes 0 V to +2 V for all input  
channels. T his is covered in more detail under the section  
Changing the Analog Input Voltage Range. T he voltage VBIAS  
is the offset of the ADC’s midpoint code from ground and is  
supplied either by an onboard reference available to the user  
(REFOUT ) or by an external voltage reference applied to  
REFIN. T he full-scale range (FSR) of the ADC is equal to  
2 VSWING where VSWING is nominally equal to REFIN/2. Addi-  
tionally, when placed in the half-scale conversion mode, the  
value of REFIN is converted. T his allows the channel offset(s)  
to be measured.  
REFIN  
T/H  
2
MUX  
2
V
SWING  
REF  
REFOUT  
RTN  
AGND  
AD7777  
CONTROL LOGIC  
REFIN  
DGND AGND  
V
CC  
CLKIN  
A 1  
IN  
A 2  
IN  
A 3  
IN  
A 4  
IN  
A 5  
IN  
CONTROL  
REGISTER  
Control register loading and ADC register reading, channel se-  
lect and conversion start are under the control of the µP. T he  
twos complemented coded ADCs are easily interfaced to a stan-  
dard 16-bit MPU bus via their 10-bit data port and standard  
microprocessor control lines.  
MUX  
1
10  
T/H  
1
ADCREG2  
ADCREG1  
A 6  
IN  
A 7  
IN  
A 8  
IN  
DB0–DB9  
10-BIT  
ADC  
10  
C
REFIN  
V
BIAS  
T he AD7776/AD7777/AD7778 are fabricated in linear compat-  
ible CMOS (LC2MOS), an advanced, mixed technology process  
that combines precision bipolar circuits with low power CMOS  
logic. T he AD7776 is available in a 24-pin SOIC package; the  
AD7777 is available in both 28-pin DIP and 28-pin SOIC pack-  
ages; the AD7778 is available in a 44-pin PQFP package.  
REFIN  
T/H  
2
MUX  
2
V
SWING  
REF  
REFOUT  
RTN  
AGND  
AD7778  
CONTROL LOGIC  
REFIN  
*P r otected by U.S. P atent No. 4,990,916.  
DGND AGND  
RD  
BUSY/INT  
WR  
CS  
REV. 0  
Inform ation furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assum ed by Analog Devices for its  
use, nor for any infringem ents of patents or other rights of third parties  
which m ay result from its use. No license is granted by im plication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.  
Tel: 617/ 329-4700  
Fax: 617/ 326-8703  
World Wide Web Site: http:/ / w w w .analog.com  
© Analog Devices, Inc., 1997  
1234567...12

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