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AD7245ABRZ

更新时间： 2024-11-19 12:36:11
品牌 Logo 应用领域
亚德诺 - ADI 转换器数模转换器光电二极管PC
页数 文件大小 规格书
16页 669K
描述
LC2MOS 12-Bit DACPORTs

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AD7245ABRZ 数据手册

 浏览型号AD7245ABRZ的Datasheet PDF文件第2页浏览型号AD7245ABRZ的Datasheet PDF文件第3页浏览型号AD7245ABRZ的Datasheet PDF文件第4页浏览型号AD7245ABRZ的Datasheet PDF文件第5页浏览型号AD7245ABRZ的Datasheet PDF文件第6页浏览型号AD7245ABRZ的Datasheet PDF文件第7页 
LC2MOS  
12-Bit DACPORTs  
a
AD7245A/AD7248A  
FEATURES  
AD7245A FUNCTIONAL BLOCK DIAGRAM  
12-Bit CMOS DAC with Output Amplifier and  
Reference  
Improved AD7245/AD7248:  
V
R
OFS  
DD  
REF OUT  
2R  
2R  
R
FB  
12 V to 15 V Operation  
؎1/2 LSB Linearity Grade  
V
OUT  
Faster Interface—30 ns Typ Data Setup Time  
Extended Plastic Temperature Range (–40؇C to +85؇C)  
Single or Dual Supply Operation  
Low Power—65 mW Typ in Single Supply  
Parallel Loading Structure: AD7245A  
(8+4) Loading Structure: AD7248A  
V
REF  
DAC  
V
SS  
AGND  
CS  
WR  
DAC LATCH  
INPUT LATCH  
DB0 DB11  
CLR  
CONTROL  
LOGIC  
AD7245A  
GENERAL DESCRIPTION  
LDAC  
The 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  
VDD. Additional features include extended temperature range  
operation for commercial and industrial grades.  
DGND  
AD7248A FUNCTIONAL BLOCK DIAGRAM  
The AD7245A/AD7248A is a complete, 12-bit, voltage output,  
digital-to-analog converter with output amplifier and Zener voltage  
reference on a monolithic CMOS chip. No external user trims  
are required to achieve full specified performance.  
V
R
OFS  
DD  
REF OUT  
2R  
2R  
R
FB  
Both parts are microprocessor compatible, with high speed data  
latches and double-buffered interface logic. The AD7245A accepts  
12-bit parallel data that is loaded into the input latch on the  
rising edge of CS or WR. The AD7248A has an 8-bit-wide data  
bus with data loaded to the input latch in two write operations.  
For both parts, an asynchronous LDAC signal transfers data  
from the input latch to the DAC latch and updates the analog  
output. The AD7245A also has a CLR signal on the DAC latch  
which allows features such as power-on reset to be implemented.  
V
OUT  
V
REF  
DAC  
V
SS  
AGND  
LDAC  
DAC LATCH  
WR  
CONTROL  
LOGIC  
AD7248A  
CSLSB  
4-BIT  
8-BIT  
INPUT  
LATCH  
INPUT  
CSMSB  
LATCH  
The 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. The output amplifiers are capa-  
ble of developing 10 V across a 2 kΩ load to GND.  
DB7 DB0  
DGND  
PRODUCT HIGHLIGHTS  
1. The AD7245A/AD7248A is a 12-bit DACPORT® on a single  
chip. This single chip design and small package size offer  
considerable space saving and increased reliability over  
multichip designs.  
The AD7245A/AD7248A is fabricated in linear compatible CMOS  
(LC2MOS), an advanced, mixed technology process that combines  
precision bipolar circuits with low power CMOS logic. The  
AD7245A is available in a small, 0.3" wide, 24-lead DIP and  
SOIC and in 28-terminal surface mount packages. The AD7248A  
is packaged in a small, 0.3" wide, 20-lead DIP and SOIC and in  
20-terminal surface mount packages.  
2. The improved interface times on the part allows easy, direct  
interfacing to most modern microprocessors.  
3. The AD7245A/AD7248A features a wide power supply range  
allowing operation from 12 V supplies.  
DACPORT is a registered trademark of Analog Devices, Inc.  
REV. B  
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., 2001  
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AD7245ABRZ 替代型号

型号 品牌 替代类型 描述 数据表
AD7245AARZ ADI

完全替代

 LC2MOS 12-Bit DACPORTs
AD7245AAR ADI

完全替代

 LC2MOS 12-Bit DACPORTs

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