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AD7835_15

更新时间： 2024-12-01 01:19:43
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LC MOS Quad 14-Bit DACs

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AD7835_15 数据手册

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LC2MOS  
Quad 14-Bit DACs  
AD7834/AD7835  
FSYNC  
into one via DIN, SCLK, and  
. The AD7834 has five  
FEATURES  
dedicated package address pins, PA0 to PA4, that can be ꢂired  
to AGND or ꢁCC to permit up to 39 AD7834s to be individually  
addressed in a multipackage application.  
Four 14-bit DACs in one package  
AD7834—serial loading  
AD7835—parallel 8-bit/14-bit loading  
Voltage outputs  
The AD7835 can accept either 14-bit parallel loading or double-  
byte loading, ꢂhere right-justified data is loaded in one 8-bit  
byte and one 6-bit byte. Data is loaded from the external bus  
Power-on reset function  
Maximum/minimum output voltage range of 8.192 V  
Maximum output voltage span of 14 V  
Common voltage reference inputs  
User-assigned device addressing  
Clear function to user-defined voltage  
Surface-mount packages  
WR CS  
into one of the input latches under the control of the  
,
,
BYSHF  
, and DAC channel address pins, A0 to A9.  
LDAC  
With each device, the  
signal is used to update all four  
DAC outputs simultaneously, or individually, on reception of  
CLR  
neꢂ data. In addition, for each device, the asynchronous  
AD7834—28-lead SOIC and PDIP  
AD7835—44-lead MQFP and PLCC  
input can be used to set all signal outputs, ꢁOUT1 to ꢁOUT4, to  
the user-defined voltage level on the device sense ground pin,  
DSG. On poꢂer-on, before the poꢂer supplies have stabilized,  
internal circuitry holds the DAC output voltage levels to ꢂithin  
9 ꢁ of the DSG potential. As the supplies stabilize, the DAC  
APPLICATIONS  
Process control  
Automatic test equipment  
General-purpose instrumentation  
CLR  
output levels move to the exact DSG potential (assuming  
exercised).  
is  
GENERAL DESCRIPTION  
The AD7834 is available in a 98-lead 0.3" SOIC package and a  
98-lead 0.6" PDIP package, and the AD7835 is available in a  
44-lead MQFP package and a 44-lead PLCC package.  
The AD7834 and AD7835 contain four 14-bit DACs on one  
monolithic chip. The AD7834 and AD7835 have output  
voltages in the range 8.1ꢀ9 ꢁ ꢂith a maximum span of 14 ꢁ.  
The AD7834 is a serial input device. Data is loaded in 16-bit  
format from the external serial bus, MSB first after tꢂo leading 0s,  
FUNCTIONAL BLOCK DIAGRAMS  
V
V
(–)A  
V
REF  
V
V
(+)A  
DSGA  
REF  
V
V (–)  
V
REF  
V
V
(+)  
REF  
CC  
DD  
SS  
CC  
DD  
SS  
AD7835  
INPUT  
REGISTER  
1
INPUT  
AD7834  
DAC 1  
DAC 1  
DAC 1  
DAC 2  
DAC 1  
DAC 2  
REGISTER  
1
LATCH  
LATCH  
BYSHF  
PAEN  
×1  
×1  
V
V
1
2
×1  
×1  
V
1
2
OUT  
OUT  
OUT  
14  
DB13  
DB0  
INPUT  
BUFFER  
PA0  
PA1  
INPUT  
REGISTER  
2
INPUT  
REGISTER  
2
DAC 2  
LATCH  
DAC 2  
LATCH  
CONTROL  
LOGIC  
AND  
ADDRESS  
DECODE  
V
WR  
CS  
OUT  
PA2  
PA3  
PA4  
INPUT  
REGISTER  
3
DAC 3  
LATCH  
INPUT  
REGISTER  
3
DAC 3  
DAC 4  
DAC 3  
LATCH  
DAC 3  
DAC 4  
×1  
×1  
V
V
3
4
OUT  
OUT  
×1  
×1  
V
3
4
OUT  
A0  
A1  
A2  
FSYNC  
INPUT  
REGISTER  
4
ADDRESS  
DECODE  
DAC 4  
LATCH  
INPUT  
REGISTER  
4
DAC 4  
LATCH  
SERIAL-TO-  
PARALLEL  
CONVERTER  
DIN  
V
OUT  
CLR  
SCLK  
CLR  
DSGB  
(+)B  
AGND  
DGND  
V
(–)B  
V
LDAC  
AGND  
DGND  
LDAC  
DSG  
REF  
REF  
Figure 1. AD7834  
Figure 2. AD7835  
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. 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 www.analog.com  
Fax: 781.461.3113 ©2003–2007 Analog Devices, Inc. All rights reserved.  
 
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 		LC2MOS Quad 14-Bit DAC
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AD7835AP-REEL ADI

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AD7835APZ ADI

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AD7835APZ-REEL ADI

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 		IC QUAD, PARALLEL INPUT LOADING, 10 us SETTLING TIME, 14-BIT DAC, PQCC44, ROHS COMPLIANT,
AD7835AS ADI

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 		LC2MOS Quad 14-Bit DAC
AD7835AS ROCHESTER

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 		QUAD, PARALLEL INPUT LOADING, 10 us SETTLING TIME, 14-BIT DAC, PQFP44, MO-112AA-1, MQFP-44
AD7835AS-REEL ADI

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 		IC QUAD, PARALLEL INPUT LOADING, 10 us SETTLING TIME, 14-BIT DAC, PQFP44, MO-112AA-1, MQFP
AD7835ASZ ADI

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 		LC2MOS Quad 14-Bit DAC

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