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AD7798_15 PDF预览

AD7798_15

更新时间: 2024-11-27 01:22:35
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
28页 445K
描述
3-Channel, Low Noise, Low Power

AD7798_15 数据手册

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3-Channel, Low Noise, Low Power,  
16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp  
Data Sheet  
AD7798/AD7799  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
GND  
AV  
REFIN(+) REFIN(–)  
DD  
RMS noise:  
27 nV at 4.17 Hz (AD7799)  
65 nV at 16.7 Hz (AD7799)  
40 nV at 4.17 Hz (AD7798)  
85 nV at 16.7 Hz (AD7798)  
Current: 380 µA typical  
Power-down: 1 µA maximum  
Low noise, programmable gain, instrumentation amp  
Update rate: 4.17 Hz to 470 Hz  
3 differential inputs  
REFERENCE  
DETECT  
AD7798/AD7799  
AIN1(+)  
AIN1(–)  
AV  
DD  
DOUT/RDY  
DIN  
AIN2(+)  
SERIAL  
INTERFACE  
AND  
CONTROL  
LOGIC  
MUX  
AIN2(–)  
Σ-Δ  
ADC  
IN-AMP  
AIN3(+)/P1  
AIN3(–)/P2  
SCLK  
CS  
GND  
DV  
DD  
PSW  
INTERNAL  
CLOCK  
AD7798: 16-BIT  
AD7799: 24-BIT  
Internal clock oscillator  
GND  
Simultaneous 50 Hz/60 Hz rejection  
Reference detect  
Figure 1.  
Low-side power switch  
Programmable digital outputs  
Burnout currents  
Power supply: 2.7 V to 5.25 V  
–40°C to +105°C temperature range  
Independent interface power supply  
16-lead TSSOP package  
GENERAL DESCRIPTION  
The AD7798/AD7799 are low power, low noise, complete  
analog front ends for high precision measurement applications.  
The AD7798/AD7799 contains a low noise, 16-/24-bit ∑-∆  
ADC with three differential analog inputs. The on-chip, low  
noise instrumentation amplifier means that signals of small  
amplitude can be interfaced directly to the ADC. With a gain  
setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV  
for the AD7798 when the update rate equals 4.17 Hz.  
INTERFACE  
3-wire serial  
SPI®, QSPI™, MICROWIRE™, and DSP compatible  
Schmitt trigger on SCLK  
On-chip features include a low-side power switch, reference  
detect, programmable digital output pins, burnout currents,  
and an internal clock oscillator. The output data rate from the  
part is software-programmable and can be varied from 4.17 Hz  
to 470 Hz.  
APPLICATIONS  
Weigh scales  
Pressure measurement  
Strain gauge transducers  
Gas analysis  
Industrial process control  
Instrumentation  
The part operates with a power supply from 2.7 V to 5.25 V.  
The AD7798 consumes a current of 300 µA typical, whereas the  
AD7799 consumes 380 µA typical. Both devices are housed in a  
16-lead TSSOP package.  
Portable instrumentation  
Blood analysis  
Smart transmitters  
Liquid/gas chromotography  
6-digit DVM  
Rev. B  
Document Feedback  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2005–2013 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
 

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