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AD7890BN

更新时间: 2024-11-15 23:27:35
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其他 - ETC 转换器光电二极管
页数 文件大小 规格书
20页 191K
描述
LC 2 MOS 8-Channel 12-Bit Serial Data Acquisition System(191.20 k)

AD7890BN 数据手册

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LC2MOS 8-Channel, 12-Bit  
Serial, Data Acquisition System  
a
AD7890  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Fast 12-Bit ADC with 5.9 s Conversion Time  
Eight Single-Ended Analog Input Channels  
Selection of Input Ranges:  
MUX SHA REF OUT/  
V
DD  
OUT IN  
REF IN  
؎10 V for AD7890-10  
0 V to 4.096 V for AD7890-4  
0 V to 2.5 V for AD7890-2  
SIGNAL  
2k  
V
2.5V  
REFERENCE  
IN1  
SCALING*  
SIGNAL  
SCALING*  
V
IN2  
Allows Separate Access to Multiplexer and ADC  
On-Chip Track/Hold Amplifier  
On-Chip Reference  
High-Speed, Flexible, Serial Interface  
Single Supply, Low-Power Operation (50 mW Max)  
Power-Down Mode (75 W Typ)  
SIGNAL  
V
IN3  
SCALING*  
C
EXT  
SIGNAL  
SCALING*  
V
IN4  
MUX  
SIGNAL  
SCALING*  
V
IN5  
CONVST  
SIGNAL  
SCALING*  
V
IN6  
12-BIT  
ADC  
SIGNAL  
SCALING*  
V
IN7  
SIGNAL  
SCALING*  
TRACK/HOLD  
OUTPUT/CONTROL REGISTER  
V
IN8  
GENERAL DESCRIPTION  
AD7890  
CLOCK  
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  
SCLK  
TFS  
RFS  
SMODE  
CLK  
IN  
DATA DATA  
OUT IN  
*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. The AD7890 is fabricated in  
Analog Devices’ Linear Compatible CMOS (LC2MOS) process,  
a mixed technology process that combines precision bipolar  
circuits with low power CMOS logic. The part is available in a  
24-lead, 0.3" wide, plastic or hermetic dual-in-line package or in  
a 24-lead small outline package (SOIC).  
The multiplexer on the part is independently accessible. This  
allows the user to insert an antialiasing filter or signal conditioning,  
if required, between the multiplexer and the ADC. This means  
that one antialiasing filter can be used for all eight channels.  
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  
bidirectional serial interface port. The part contains an on-chip  
control register, allowing control of channel selection, conver-  
sion start and power-down via the serial port. Versatile, high  
speed logic ensures easy interfacing to serial ports on microcon-  
trollers and digital signal processors.  
PRODUCT HIGHLIGHTS  
1. Complete 12-Bit Data Acquisition System-on-a-Chip  
The 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.  
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.  
2. Separate Access to Multiplexer and ADC  
The 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  
The part provides a high-speed serial interface for easy con-  
nection to serial ports of microcontrollers and DSP processors.  
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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