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AD7890AN-4 PDF预览

AD7890AN-4

更新时间: 2024-11-15 22:22:19
品牌 Logo 应用领域
亚德诺 - ADI 转换器模数转换器光电二极管
页数 文件大小 规格书
20页 304K
描述
LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

AD7890AN-4 数据手册

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2
LC MOS 8-Channel, 12-Bit  
Serial, Data Acquisition System  
a
AD7890  
FUNCTIO NAL BLO CK D IAGRAM  
FEATURES  
Fast 12-Bit ADC w ith 5.9 s Conversion Tim e  
Eight Single-Ended Analog Input Channels  
Selection of Input Ranges:  
؎10 V for AD7890-10  
0 V to ؉4.096 V for AD7890-4  
0 V to ؉2.5 V for AD7890-2  
MUX SHA REF OUT/  
VDD  
OUT IN  
REF IN  
2kΩ  
SIGNAL  
SCALING*  
+2.5V  
REFERENCE  
VIN1  
VIN2  
SIGNAL  
SCALING*  
AD7890  
Allow s Separate Access to Multiplexer and ADC  
On-Chip Track/ Hold Am plifier  
On-Chip Reference  
High Speed, Flexible, Serial Interface  
Single Supply, Low Pow er Operation (50 m W m ax)  
Pow er-Dow n Mode (75 W typ)  
SIGNAL  
VIN3  
VIN4  
VIN5  
VIN6  
VIN7  
VIN8  
SCALING*  
CEXT  
SIGNAL  
SCALING*  
M
U
X
SIGNAL  
SCALING*  
CONVST  
SIGNAL  
SCALING*  
12-BIT  
ADC  
SIGNAL  
SCALING*  
TRACKHOLD  
SIGNAL  
SCALING*  
OUTPUT/CONTROL REGISTER  
CLOCK  
GENERAL D ESCRIP TIO N  
The AD7890 is an eight-channel 12-bit data acquisition system.  
The part contains an input multiplexer, an on-chip track/hold  
amplifier, a high-speed 12-bit ADC, a +2.5 V reference and a high  
speed, serial interface. The part operates from a single +5 V supply  
and accepts an analog input range of ±10 V (AD7890-10), 0 V to  
+4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2).  
AGND AGND  
DGND CLK  
IN  
SCLK  
DATA SMODE  
IN  
TFS  
DATA  
OUT  
RFS  
*NO SCALING ON AD7890-2  
Power dissipation in normal mode is low at 30 mW typ and the  
part can be placed in a standby (power-down) mode if it is not  
required to perform conversions. T he AD7890 is fabricated in  
Analog Devices’ Linear Compatible CMOS (LC2MOS) process,  
a mixed technology process that combines precision bipolar cir-  
cuits with low power CMOS logic. T he part is available in a  
24-pin, 0.3" wide, plastic or hermetic dual-in-line package or in  
a 24-pin small outline package (SOIC).  
T he multiplexer on the part is independently accessible. T his  
allows the user to insert an antialiasing filter or signal condition-  
ing, if required, between the multiplexer and the ADC. T his  
means that one antialiasing filter can be used for all eight chan-  
nels. Connection of an external capacitor allows the user to  
adjust the time given to the multiplexer settling to include any  
external delays in the filter or signal conditioning circuitry.  
Output data from the AD7890 is provided via a high speed bidi-  
rectional serial interface port. T he part contains an on-chip con-  
trol register, allowing control of channel selection, conversion  
start and power-down via the serial port. Versatile, high speed  
logic ensures easy interfacing to serial ports on microcontrollers  
and digital signal processors.  
P RO D UCT H IGH LIGH TS  
1. Complete 12-Bit Data Acquisition System on a Chip  
T he AD7890 is a complete monolithic ADC combining an  
eight-channel multiplexer, 12-bit ADC, +2.5 V reference and  
a track/hold amplifier on a single chip.  
2. Separate Access to Multiplexer and ADC  
In addition to the traditional dc accuracy specifications such as  
linearity, full-scale and offset errors, the AD7890 is also speci-  
fied for dynamic performance parameters including harmonic  
distortion and signal-to-noise ratio.  
T he AD7890 provides access to the output of the multiplexer  
allowing one antialiasing filter for eight channels—a consid-  
erable saving over the eight antialiasing filters required if the  
multiplexer was internally connected to the ADC.  
3. High Speed Serial Interface  
T he part provides a high speed serial interface for easy  
connection to serial ports of microcontrollers and DSP  
processors.  
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.  
© Analog Devices, Inc., 1996  
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.  
Tel: 617/ 329-4700  
Fax: 617/ 326-8703  

AD7890AN-4 替代型号

型号 品牌 替代类型 描述 数据表
AD7890BNZ-2 ADI

完全替代

8-Channel, 12-Bit Serial Data Acquisition System
AD7890ANZ-2 ADI

完全替代

LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
AD7890SQ-4 ADI

完全替代

LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

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