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AD7245AAP

更新时间: 2024-11-01 22:47:31
品牌 Logo 应用领域
亚德诺 - ADI 转换器数模转换器
页数 文件大小 规格书
16页 308K
描述
LC2MOS 12-Bit DACPORTs

AD7245AAP 数据手册

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2
LC MOS  
12-Bit DACPORTs  
a
AD7245A/AD7248A  
FEATURES  
AD 7245A FUNCTIO NAL BLO CK D IAGRAM  
12-Bit CMOS DAC w ith Output Am plifier and  
Reference  
Im proved AD7245/ AD7248:  
12 V to 15 V Operation  
؎1/ 2 LSB Linearity Grade  
Faster Interface30 ns typ Data Setup Tim e  
Extended Plastic Tem perature Range (–40؇C to +85؇C)  
Single or Dual Supply Operation  
Low Pow er–65 m W typ in Single Supply  
Parallel Loading Structure: AD7245A  
(8+4) Loading Structure: AD7248A  
GENERAL D ESCRIP TIO N  
T he AD7245A/AD7248A is an enhanced version of the industry  
standard AD7245/AD7248. Improvements include operation  
from 12 V to 15 V supplies, a ±1/2 LSB linearity grade, faster  
interface times and better full scale and reference variations with  
AD 7248A FUNCTIO NAL BLO CK D IAGRAM  
VDD. Additional features include extended temperature range  
operation for commercial and industrial grades.  
T he AD7245A/AD7248A is a complete, 12-bit, voltage output,  
digital-to-analog converter with output amplifier and Zener volt-  
age reference on a monolithic CMOS chip. No external user  
trims are required to achieve full specified performance.  
Both parts are microprocessor compatible, with high speed data  
latches and double-buffered interface logic. T he AD7245A ac-  
cepts 12-bit parallel data which is loaded into the input latch on  
the rising edge of CS or WR. T he AD7248A has an 8-bit wide  
data bus with data loaded to the input latch in two write opera-  
tions. For both parts, an asynchronous LDAC signal transfers  
data from the input latch to the DAC latch and updates the ana-  
log output. T he AD7245A also has a CLR signal on the DAC latch  
which allows features such as power-on reset to be implemented.  
T he on-chip 5 V buried Zener diode provides a low noise, tem-  
perature compensated reference for the DAC. For single supply  
operation, two output ranges of 0 V to +5 V and 0 V to +10 V  
are available, while these two ranges plus an additional ±5 V  
range are available with dual supplies. T he output amplifiers are  
capable of developing +10 V across a 2 kload to GND.  
SOIC and in 28-terminal surface mount packages. T he  
AD7248A is packaged in a small, 0.3" wide, 20-pin DIP and  
SOIC and in 20-terminal surface mount packages.  
P RO D UCT H IGH LIGH TS  
1. T he AD7245A/AD7248A is a 12-bit DACPORT® on a single  
chip. T his single chip design and small package size offer  
considerable space saving and increased reliability over  
multichip designs.  
T he AD7245A/AD7248A is fabricated in linear compatible  
CMOS (LC2MOS), an advanced, mixed technology process that  
combines precision bipolar circuits with low power CMOS logic.  
T he AD7245A is available in a small, 0.3" wide, 24-pin DIP and  
2. T he improved interface times on the part allows easy, direct  
interfacing to most modern microprocessors.  
3. T he AD7245A/AD7248A features a wide power supply range  
allowing operation from 12 V supplies.  
D ACP O RT is a r egister ed tr adem ar k of Analog D evices, Inc.  
REV. A  
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  

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