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AD7854LARS-REEL

更新时间： 2024-11-04 20:41:39
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
32页 490K
描述
IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28, SSOP-28, Analog to Digital Converter

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AD7854LARS-REEL 数据手册

 浏览型号AD7854LARS-REEL的Datasheet PDF文件第2页浏览型号AD7854LARS-REEL的Datasheet PDF文件第3页浏览型号AD7854LARS-REEL的Datasheet PDF文件第4页浏览型号AD7854LARS-REEL的Datasheet PDF文件第5页浏览型号AD7854LARS-REEL的Datasheet PDF文件第6页浏览型号AD7854LARS-REEL的Datasheet PDF文件第7页 
3 V to 5 V Single Supply, 200 kSPS  
12-Bit Sampling ADC  
a
AD7854/AD7854L*  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Specified for VDD of 3 V to 5.5 V  
Read-Only Operation  
AV  
AGND  
DD  
AD7854–200 kSPS; AD7854L–100 kSPS  
System and Self-Calibration with Autocalibration on  
Power-Up  
AIN(+)  
AIN(–)  
AD7854/AD7854L  
T/H  
2.5V  
REFERENCE  
Low Power  
DV  
DD  
AD7854: 15 mW (VDD = 3 V)  
AD7854L: 5.5 mW (VDD = 3 V)  
Automatic Power-Down After Conversion (25 ␮W)  
Flexible Parallel interface  
12-Bit Parallel / 8-Bit Parallel (AD7854)  
28-Pin DIP, SOIC and SSOP Packages (AD7854)  
COMP  
BUF  
REF  
/
IN  
REF  
OUT  
C
REF1  
DGND  
CHARGE  
REDISTRIBUTION  
DAC  
APPLICATIONS  
C
Battery-Powered Systems (Personal Digital Assistants,  
Medical Instruments, Mobile Communications)  
Pen Computers  
Instrumentation and Control Systems  
High Speed Modems  
REF2  
CLKIN  
CONVST  
BUSY  
SAR + ADC  
CONTROL  
CALIBRATION  
MEMORY  
AND CONTROLLER  
PARALLEL INTERFACE/CONTROL REGISTER  
GENERAL DESCRIPTION  
DB11–DB0  
HBEN  
CS  
RD  
WR  
The AD7854/AD7854L is a high speed, low-power, 12-bit  
ADC which operates from a single 3 V or 5 V power supply, the  
AD7854 being optimized for speed and the AD7854L for low  
power. The ADC powers up with a set of default conditions at  
which time it can be operated as a read-only ADC. The ADC  
contains self-calibration and system calibration options to en-  
sure accurate operation over time and temperature and has a  
number of power-down options for low power applications.  
PRODUCT HIGHLIGHTS  
1. Operation with either 3 V or 5 V power supplies.  
2. Automatic calibration on power-up.  
3. Flexible power management options including automatic  
power-down after conversion.  
The AD7854 is capable of 200 kHz throughput rate while the  
AD7854L is capable of 100 kHz throughput rate. The input  
track-and-hold acquires a signal in 500 ns and features a pseudo-  
differential sampling scheme. The AD7854 and AD7854L input  
voltage range is 0 to VREF (unipolar) and –VREF/2 to +VREF/2,  
centered at VREF/2 (bipolar). The coding is straight binary in  
unipolar mode and twos complement in bipolar mode. Input  
signal range is to the supply and the part is capable of convert-  
ing full-power signals to 100 kHz.  
4. Operates with reference voltages from 1.2 V to AVDD  
.
5. Analog input ranges from 0 V to AVDD  
6. Self- and system-calibration.  
7. Versatile parallel I/0 port.  
.
8. Lower power version AD7854L.  
CMOS construction ensures low power dissipation of typically  
5.4 mW for normal operation and 3.6 µW in power-down mode.  
The part is available in 28-pin, 0.3 inch wide dual-in-line pack-  
age (DIP), 28-lead small outline (SOIC) and 28-lead small  
shrink outline (SSOP) packages.  
*Patent pending.  
See Page 35 for data sheet index.  
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.  
Analog Devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing.  
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.  
© Analog Devices, Inc., 1995  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  
PRELIMINARY TECHNICAL DATA  
REV. 0  
1234567...32

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