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AD7794BRUZ1 PDF预览

AD7794BRUZ1

更新时间： 2024-11-23 12:27:15
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亚德诺 - ADI 仪表放大器
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36页 814K
描述
6-Channel, Low Noise, Low Power, 24-/16-Bit Σ-Δ ADC with On-Chip In-Amp and Reference

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AD7794BRUZ1 数据手册

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6-Channel, Low Noise, Low Power, 24-/16-Bit  
∑-Δ ADC with On-Chip In-Amp and Reference  
AD7794/AD7795  
Industrial process control  
Instrumentation  
Blood analysis  
FEATURES  
Up to 23 effective bits  
RMS noise: 40 nV @ 4.17 Hz, 85 nV @ 16.7 Hz  
Current: 400 μA typical  
Smart transmitters  
Liquid/gas chromatography  
6-digit DVM  
Power-down: 1 μA maximum  
Low noise, programmable gain, instrumentation amp  
Band gap reference with 4 ppm/°C drift typical  
Update rate: 4.17 Hz to 470 Hz  
Six differential analog inputs  
Internal clock oscillator  
Simultaneous 50 Hz/60 Hz rejection  
Reference detect  
Programmable current sources  
On-chip bias voltage generator  
Burnout currents  
Low-side power switch  
Power supply: 2.7 V to 5.25 V  
Temperature range:  
B grade: –40°C to +105°C  
C grade: –40°C to +125°C  
GENERAL DESCRIPTION  
The AD7794/AD7795 are low power, low noise, complete  
analog front ends for high precision measurement applications.  
They contain a low noise, 24-/16-bit ∑-Δ 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.  
Each device contains a precision, low noise, low drift internal  
band gap reference, and can also accept up to two external  
differential references. Other on-chip features include  
programmable excitation current sources, burnout currents,  
and a bias voltage generator that is used to set the common-  
mode voltage of a channel to AVDD/2. The low-side power  
switch can be used to power down bridge sensors between  
conversions, minimizing the system’s power consumption. The  
AD7794/AD7795 can operate with either an internal clock or  
an external clock. The output data rate from each part can vary  
from 4.17 Hz to 470 Hz.  
Independent interface power supply  
24-lead TSSOP  
3-wire serial interface  
SPI®, QSPI™, MICROWIRE™, and DSP compatible  
Schmitt trigger on SCLK  
Both parts operate with a power supply from 2.7 V to 5.25 V.  
The B-grade parts (AD7794 and AD7795) are specified for a  
temperature range of −40°C to +105°C while the C-grade part  
(AD7794) is specified for a temperature range of −40°C to  
+125°C. They consume a current of 400 μA typical and are  
housed in a 24-lead TSSOP.  
APPLICATIONS  
Temperature measurement  
Pressure measurement  
Weigh scales  
Strain gage transducers  
Gas analysis  
FUNCTIONAL BLOCK DIAGRAM  
AIN4(+)/REFIN2(+) REFIN1(+) AIN4(–)/REFIN2(–) REFIN1(–)  
GND  
AV  
DD  
REFERENCE  
DETECT  
V
BIAS  
BAND GAP  
REFERENCE  
V
DD  
GND  
AIN1(+)  
AIN1(–)  
DOUT/RDY  
DIN  
SERIAL  
INTERFACE  
AND  
Σ-Δ  
ADC  
AIN2(+)  
BUF  
IN-AMP  
SCLK  
CS  
AIN2(–)  
LOGIC  
CONTROL  
AIN3(+)  
MUX  
AIN3(–)  
GND  
V
AIN5(+)/IOUT2  
AIN5(–)/IOUT1  
AIN6(+)/P1  
AIN6(–)/P2  
TEMP  
SENSOR  
INTERNAL  
CLOCK  
DV  
DD  
AD7794/AD7795  
AD7794: 24-BIT ADC  
AD7795: 16-BIT ADC  
DD  
PSW  
GND  
CLK  
Figure 1.  
Rev. D  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 www.analog.com  
Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.  
 
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