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AD7794 PDF预览

AD7794

更新时间: 2024-11-23 04:30:47
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亚德诺 - ADI 仪表放大器
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21页 261K
描述
Low Power, 24-Bit Sigma-Delta ADC with In-Amp and Embedded Reference (6 Channel)

AD7794 数据手册

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Low Power, 24-Bit Sigma-Delta ADC with In-  
Amp and Embedded Reference (6 Channel)  
Preliminary Technical Data  
AD7794  
FEATURES  
APPLICATIONS  
Six Differential Analog Inputs  
Temperature measurement  
Pressure measurement  
Weigh scales  
Low Noise Programmable Gain Instrumentation-Amp  
RMS noise: 80 nV (Gain = 64)  
Bandgap Reference with 5 ppm/ C Drift typ  
Power  
Supply: 2.7 V to 5.25 V operation  
Normal: 400 µA typ  
GENERAL DESCRIPTION  
The AD7794 is a low power, complete analog front end for  
low frequency measurement applications. It contains a low  
noise 24-bit ∑-∆ ADC with six differential inputs. The on-chip  
low noise instrumentation amplifier means that signals of small  
amplitude can be interfaced directly to the ADC.  
Power-down: 1 µA max  
Update Rate: 4 Hz to 500 Hz  
Simultaneous 50 Hz/60 Hz Rejection  
Internal Clock Oscillator  
Reference Detect  
The device contains a precision low noise, low drift internal  
reference for absolute measurements. An external reference can  
also be used if ratiometric measurements are required. Other  
on-chip features include programmable excitation current  
sources and a bias voltage generator for temperature applica-  
tions along with 100 nA burnout currents. For pressure and  
weighscale applications, a low-side power switch is available to  
power down the bridge between conversions to minimize the  
power consumption of the system. The device can be operated  
with the internal clock or, alternatively, an external clock can be  
used if synchronizing several devices. The output data rate  
from the part is software programmable and can be varied from  
4 Hz to 500 Hz.  
Programmable Current Sources (10 µA/200 µA/1 mA)  
On-Chip Bias Voltage Generator  
100 nA Burnout Currents  
Low Side Power Switch  
Independent Interface Power Supply  
24-Lead TSSOP Package  
INTERFACE  
3-wire serial  
SPI®, QSPI™, MICROWIRE™, and DSP compatible  
Schmitt trigger on SCLK  
The part operates with a power supply from 2.7 V to 5.25 V. It  
consumes a current of 450 uA maximum and is housed in a 24-  
lead TSSOP package.  
FUNCTIONAL BLOCK DIAGRAM  
AIN4(+)/REFIN2(+) REFIN1(+) AIN4(-)/REFIN2(-) REFIN1(-)  
GND  
AV  
DD  
V
BIAS  
REFERENCE  
DETECT  
BANDGAP  
REFERENCE  
V
DD  
AIN1(+)  
AIN1(-)  
AIN2(+)  
GND  
SERIAL  
INTERFACE  
AND  
CONTROL  
LOGIC  
DOUT/RDY  
DIN  
AIN2(-)  
AIN3(+)  
AIN3(-)  
SIGMA DELTA  
ADC  
IN-AMP  
SCLK  
CS  
MUX  
AIN5(+)/IOUT2  
AIN5(-)/IOUT1  
AIN6(+)/P1  
AIN6(-)/P2  
GND  
TEMP  
SENSOR  
DVDD  
INTERNAL  
CLOCK  
AD7794  
V
PSW  
DD  
GND  
CLK  
REV.PrE  
6/04.  
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 that may result from its use.  
Specifications subject to change without notice. No license is granted by implication  
or otherwise under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective companies.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  

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