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AD7793BRUZ-REEL1 PDF预览

AD7793BRUZ-REEL1

更新时间: 2024-11-23 12:52:39
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器
页数 文件大小 规格书
32页 661K
描述
3-Channel, Low Noise, Low Power, 16-/24-Bit Σ-Δ ADC with On-Chip In-Amp and Reference

AD7793BRUZ-REEL1 数据手册

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3-Channel, Low Noise, Low Power, 16-/24-Bit  
-Δ ADC with On-Chip In-Amp and Reference  
AD7792/AD7793  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
GND  
AV  
REFIN(+)/AIN3(+) REFIN(–)/AIN3(–)  
DD  
Up to 23 bits effective resolution  
RMS noise  
40 nV @ 4.17 Hz  
85 nV @ 16.7 Hz  
V
BIAS  
BAND GAP  
REFERENCE  
GND  
AV  
DD  
Current: 400 μA typical  
AIN1(+)  
AIN1(–)  
AIN2(+)  
AIN2(–)  
DOUT/RDY  
DIN  
SERIAL  
INTERFACE  
AND  
MUX  
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  
3 differential inputs  
Σ-Δ  
ADC  
BUF  
IN-AMP  
SCLK  
CS  
CONTROL  
LOGIC  
AV  
DD  
GND  
DV  
DD  
IOUT1  
IOUT2  
INTERNAL  
CLOCK  
AD7792: 16-BIT  
AD7793: 24-BIT  
Internal clock oscillator  
CLK  
Figure 1.  
Simultaneous 50 Hz/60 Hz rejection  
Programmable current sources  
On-chip bias voltage generator  
Burnout currents  
GENERAL DESCRIPTION  
The AD7792/AD7793 are low power, low noise, complete  
analog front ends for high precision measurement applications.  
The AD7792/AD7793 contain a low noise 16-/24-bit ∑-Δ ADC  
with three differential analog inputs. The on-chip, low noise  
instrumentation amplifier means that signals of small ampli-  
tude can be interfaced directly to the ADC. With a gain  
setting of 64, the rms noise is 40 nV when the update rate  
equals 4.17 Hz.  
Power supply: 2.7 V to 5.25 V  
–40°C to +105°C temperature range  
Independent interface power supply  
16-lead TSSOP package  
Interface  
3-wire serial  
SPI®, QSPI™, MICROWIRE™, and DSP compatible  
Schmitt trigger on SCLK  
The devices contain a precision low noise, low drift internal  
band gap reference and can accept an external differential  
reference. Other on-chip features include programmable  
excitation current sources, burnout currents, and a bias voltage  
generator. The bias voltage generator sets the common-mode  
voltage of a channel to AVDD/2.  
APPLICATIONS  
Thermocouple measurements  
RTD measurements  
Thermistor measurements  
Gas analysis  
The devices can be operated with either the internal clock or an  
external clock. The output data rate from the parts is software-  
programmable and can be varied from 4.17 Hz to 470 Hz.  
Industrial process control  
Instrumentation  
Portable instrumentation  
Blood analysis  
Smart transmitters  
Liquid/gas chromatography  
6-digit DVM  
The parts operate with a power supply from 2.7 V to 5.25 V.  
They consume a current of 400 μA typical and are housed in a  
16-lead TSSOP package.  
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 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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